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2024年7月3日发(作者：)

Java Web编程技术（第2版）

程序1.1

用户注册

用户注册

姓名：

年龄：

性别：男

女

兴趣：文学

体育

电脑

学历：

邮件地址：

程序1.2

派派电子商城

用户名

密 码

onclick="check();">

三星 S5830领取手机节优惠券，立减100元！再送：200元移动手机卡！

派派价：2068元

联想（Lenovo）G460AL-ITH 14.0英寸笔记本电脑（i3-370M 2G 500G 512

独显 DVD刻录 摄像头 Win7)特价：3199元！

程序1.3

body {

font-family:Verdana; font-size:14px; margin:10;}

#container {

margin:0 auto; width:100%;

}

#header {

height:50px; background:#9c6; margin-bottom:5px;

}

#topmenu {

height:30px; background:#c0c0c0; margin-bottom:5px;

}

#middle {

margin-bottom:5px;

}

#leftmenu {

float:left; width:180px; background:#cf9;

}

#content {

float:left; background:#ffa;

}

#footer {

height:60px; background:#9c6;

clear:both;

}

程序1.4

用户注册

method="post" onSubmit="return custCheck()">

请输入客户信息：

客户名:
Email地址:
电话:

程序1.5

package ;

import ption;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

import .*;

@WebServlet(name = "helloServlet", urlPatterns = { "/" })

public class HelloServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("Hello Servlet");

n("

Hello,World!

");

n("现在的时间是:"+new ());

n("");

n("");

}

}

程序1.6

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

简单的JSP页面

Hello,World!

现在的时间是：<%=new () %>

程序2.1

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

登录页面

用户名：
密  码：

程序2.2

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet(name="LoginServlet",urlPatterns={"/"})

public class LoginServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

String username = ameter("username");

String password = ameter("password");

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

if("admin".equals(username)&& "admin".equals(password)){

n("登录成功！欢迎您， "+username);

}else{

n("对不起！您的用户名或密码不正确．");

}

n("");

}

}

程序2.3

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/ClientInfoServlet")

public class ClientInfoServlet extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("获取客户端信息");

n("");

n("

客户端信息：

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

");

n("

客户主机名" + oteHost() + "
客户IP地址" + oteAddr() + "
端口" + otePort() + "
请求方法" + hod() + "
请求协议" + tocol() + "
请求URI" + uestURI() + "
");

n("");

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}

程序2.4

package ;

import .*;

import t.*;

import .*;

import ation;

import vlet;

@WebServlet("/ShowHeaders")

public class ShowHeadersServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("请求头信息");

n("服务器收到的请求头信息

");

n(hod()+" "

+uestURI()+" "

+ryString()+" "

+tocol()+"

");

Enumeration headers = derNames();

while(eElements()){

String header = (String) ement();

String value = der(header);

n(header+" = "+value+"

");

}

n("");

}

}

程序2.5

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet(name="LoginServlet",urlPatterns={"/"})

public class LoginServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

String username = ameter("username");

String password = ameter("password");

// 用户名和口令均为admin，认为登录成功

if(("admin")&&("admin")){

ribute("username", username);

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}else{

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

}

程序2.6

Your are welcome!

${username}

程序2.7

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

简单测试

请回答下面的问题：

1. Sun公司于2010年被Oracle公司收购。

正确

错误

2. Windows操作系统是哪个公司的产品？

Apple公司

IBM公司

Microsoft公司

3.下面的程序设计语言，哪些是面向对象的？

Java语言

C语言

C++语言

4.编写Servlet程序应继承哪个类？

交卷请点击:

重答请点击:

程序2.8

package ;

import ption;

import riter;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

@WebServlet(name="SimpleTestServlet",urlPatterns={"/"})

public class SimpleTestServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

String quest1 = ameter("quest1");

String quest2 = ameter("quest2");

String[] quest3 = ameterValues("quest3");

String quest4 = ameter("quest4").trim();

int score = 0;

if(quest1!=null && ("1")){

score = score+25; // 答对一道题加25分

}

if(quest2!=null&& ("3")){

score = score+25;

}

if(quest3!=null&&==2&&quest3[0].equals("1")&&

quest3[1].equals("3")){

score = score+25;

}

if(quest4!=null&& (("HttpServlet")||

("rvlet"))){

score = score+25;

}

n("");

n("测试结果");

n("");

n("你的成绩是："+score+"分");

n("");

}

}

程序2.9

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

上传文件

${message}

method="post">

文件上传
会员号：
文件名：

程序2.10

package ;

import .*;

import t.*;

import .*;

import tion.*;

@WebServlet(name="FileUploadServlet",urlPatterns={"/"})

@MultipartConfig(location="D:",fileSizeThreshold=1024)

public class FileUploadServlet extends HttpServlet{

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

// 返回Web应用程序文档根目录

String path = vletContext().getRealPath("/");

String mnumber = ameter("mnumber");

Part p = t("fileName");

String message="";

if(e() >1024*1024){ // 上传的文件不能超过1MB大小

();

message = "文件太大，不能上传！";

}else{

path = path + "member" +mnumber;

File f = new File(path);

if( !()){ // 若目录不存在，则创建目录

();

}

String h = der("content-disposition");

// 得到文件名

String fname = ing(dexOf("")+1, ()-1);

(path + ""+ fname);

message = "文件上传成功！";

}

ribute("message", message);

RequestDispatcher rd = uestDispatcher("/");

d(request, response);

}

}

程序2.11

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet(name="ExcelServlet",urlPatterns={"/"})

public class ExcelServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

//指定页面在传输过程中使用的编码方式

der("Content-Encoding","gb2312");

// 设置响应的内容类型

tentType("application/-excel;charset=gb2312");

PrintWriter out = ter();

n("学号t姓名t性别t年龄t所在系");

n("95001t李勇t男t20t信息");

n("95002t刘晨t女t19t数学");

}

}

程序2.12

package ;

import .*;

import .*;

import DateFormat;

import t.*;

import .*;

import vlet;

@WebServlet("/ShowTimeServlet")

public class ShowTimeServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException{

tentType("text/html;charset=UTF-8");

der("Refresh","5");

PrintWriter out = ter();

Date date = new Date();

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd a HH:mm:ss");

String s = (date); // 对日期对象格式化

n("");

n("");

n("

每5秒钟刷新一次页面

");

n("

现在的时间是："+s+"

");

n("");

n("");

}

}

程序2.13

package ;

import .*;

import t.*;

import .*;

import tion.*;

@WebServlet(name="SendRedirect",urlPatterns={"/"})

public class RedirectServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

String userAgent = der("User-Agent");

// 在请求对象上存储一个属性

ribute("param1", "请求作用域属性");

// 在会话对象上存储一个属性

sion().setAttribute("param2", "会话作用域属性");

if((userAgent!=null)&&(f("MSIE")!=-1)){

direct("");

}else{

direct("localhost:8080/");

}

}

}

程序2.14

package ;

import ption;

import tException;

import vlet;

import .*;

import riter;

@WebServlet("/StatusServlet")

public class StatusServlet extends HttpServlet {

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

String qq = ameter("q");

if(qq==null){

n("没有提供请求参数。");

}else if(("0")){

n(tus()+"

");

n("Hello,Guys!");

}else if(("1")){

tus(_FORBIDDEN);

}else if(("2")){

tus(_UNAUTHORIZED);

}else{

ror(404,"resource cannot founddd!");

}

}

}

程序2.15

xmlns:xsi="/2001/XMLSchema-instance"

xsi:schemaLocation="/xml/ns/javaee

/xml/ns/javaee/web-app_3_"

version="3.0" metadata-complete="true">

Welcome to Helloweb

Welcome to Helloweb

…

程序2.16

package ;

import .*;

import t.*;

import tion.*;

import .*;

@WebServlet(name="ConfigDemoServlet",

urlPatterns = {"/"},

initParams = {

@WebInitParam(name="email",value="**************"),

@WebInitParam(name = "telephone", value = "8899123")

})

public class ConfigDemoServlet extends HttpServlet{

String servletName = null;

ServletConfig config = null;

String email = null;

String telephone = null;

public void init(ServletConfig config) {

= config;

servletName = vletName();

email = tParameter("email");

telephone = tParameter("telephone");

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("");

n("配置对象");

n("Servlet名称："+servletName+"

");

n("Email地址："+email+"

");

n("电话："+telephone);

n("");

}

}

程序3.1

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/")

public class FileDownloadServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

// 设置文件的内容类型

tentType("image/gif");

// 设置Content-Disposition响应头，指定文件名

der("Content-Disposition",

"attachment;filename=");

// 获得输出流对象

OutputStream os = putStream();

ServletContext context = getServletContext();

// 返回输入流对象

InputStream is =

ourceAsStream("/files/");

byte[] bytearray = new byte[1024];

int bytesread = 0;

// 从输入流中读取1K字节，然后写到输出流中

while((bytesread = (bytearray)) != -1 ){

// 将数据发送到客户端

(bytearray, 0, bytesread);

}

();

();

}

}

程序3.2

package ;

import .*;

import t.*;

import .*;

import ;

import vlet;

@WebServlet("/ShowSessionServlet")

public class ShowSessionServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

// 创建或返回用户会话对象

HttpSession session = sion(true);

String heading = null;

// 从会话对象中检索accessCount属性

Integer accessCount = (Integer)ribute("accessCount");

if(accessCount==null){

accessCount = new Integer(1);

heading = "欢迎您，首次登录该页面！";

}else{

heading = "欢迎您，再次访问该页面！";

accessCount = accessCount+1;

}

// 将accessCount作为属性存储到会话对象中

ribute("accessCount",accessCount);

PrintWriter out = ter();

n("");

n("会话跟踪示例");

n("

");

n("

"+heading

+"再次访问"+"

");

n("

");

n("

n");

String state = ()?"新会话":"旧会话";

n("

信息值
会话状态："+state+"n");

n("

会话ID:"+()+"n");

n("

创建时间:");

n(""+new Date(ationTime())+"n");

n("

最近访问时间:");

n(""+new Date(tAccessedTime())+"n");

n("

最大不活动时间:"+

InactiveInterval()+"n");

n("

Cookie:"+der("Cookie")+"n");

n("

已被访问次数:"+accessCount+"n");

n("

");

n("

");

}

}

程序3.3

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/GuessNumberServlet")

public class GuessNumberServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

int magic = (int)(()*101);

HttpSession session = sion();

ribute("num",new Integer(magic));

tentType("text/html;charset=utf-8");

PrintWriter out = ter();

n("");

n("我想出一个0到100之间的数，请你猜！");

n("

method='post'>");

n("");

n("");

n("

");

n("");

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

int guess = nt(ameter("guess"));

HttpSession session = sion();

int magic = (Integer)ribute("num");

tentType("text/html;charset=utf-8");

PrintWriter out = ter();

n("");

if(guess==magic){

date(); // 销毁会话对象

n("祝贺你，答对了!");

n("

再猜一次.");

}else if(guess>magic){

n("太大了! 请重猜!");

}else{

n("太小了! 请重猜!");

}

n("

method='post'>");

n("");

n("");

n("

");

n("");

}

}

程序3.4

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/SendCookie")

public class SendCookieServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

Cookie userCookie = new Cookie("username", "hacker");

Age(60*60*24*7);

kie(userCookie);

tentType("text/html;charset=UTF-8");

PrintWriter out = ter();

n("发送Cookie");

n("

已向浏览器发送一个Cookie。

");

n("");

}

}

程序3.5

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/ReadCookie")

public class ReadCookieServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException{

String cookieName = "username";

String cookieValue = null;

Cookie[] cookies = kies();

if (cookies!=null){

for(int i = 0;i<;i++){

Cookie cookie = cookies[i];

if(e().equals(cookieName))

cookieValue = ue();

}

}

tentType("text/html;charset=utf-8");

PrintWriter out=ter();

n("读取Cookie");

n("

从浏览器读回一个Cookie

");

n("Cookie名:"+cookieName+"

");

n("Cookie值:"+cookieValue+"

");

n("");

}

}

程序3.6

<%@ page contentType="text/html;charset=UTF-8"

pageEncoding="UTF-8"%>

登录页面

${e}

请输入用户名和口令：

用户名:

口 令:

自动登录

程序3.7

package ;

import ption;

import t.*;

import .*;

import vlet;

@WebServlet("/CheckUserServlet")

public class CheckUserServlet extends HttpServlet {

String message = null;

protected void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

String value1 = "",value2="";

Cookie cookie = null;

Cookie[] cookies = kies();

if (cookies!=null){

for(int i = 0;i<;i++){

cookie = cookies[i];

if(e().equals("username"))

value1 = ue();

if(e().equals("password"))

value2 = ue();

}

if(("admin")&&("admin")){

message = "欢迎您！"+value1+"再次登录该页面！";

sion().setAttribute("message", message);

direct("");

}else{

direct("");

}

}else{

direct("");

}

}

protected void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

tentType("text/html;charset=utf-8");

String username = ameter("username").trim();

String password = ameter("password").trim();

if(!("admin") || !("admin")){

message = "用户名或口令不正确，请重试！";

sion().setAttribute("message",message);

direct("");

}else{

// 如果用户选中了“自动登录”复选框，向浏览器发送2个Cookie

if((ameter("check")!=null) &&

(ameter("check").equals("check"))){

Cookie nameCookie = new Cookie("username", username);

Cookie pswdCookie = new Cookie("password", password);

Age(60*60);

Age(60*60);

kie(nameCookie);

kie(pswdCookie);

}

message = "你已成功登录！";

sion().setAttribute("message",message);

direct("");

}

}

}

程序4.1

<%@ page contentType="text/html;charset = UTF-8" %>

<%! int count = 0; %>

<%

count++;

%>

该页面已被访问<%=count %> 次。

程序4.2

<%!

int anInt = 3;

boolean aBool = true;

Integer anIntObj = new Integer(3);

Float aFloatObj = new Float(8.6);

%>

<%= 500+380 %>

<%= anInt*3.5/100-500 %>

<%= aBool %>

<%= () %>

<%= aFloatObj %>

程序4.3

<%@page import="" %>

<%@page import="rmat"%>

<%@page contentType="text/html;charset=UTF-8" %>

Today's date

<%

DateFormat dateFormat = eInstance();

String s = (new Date());

%>

今天的日期是：<%=s%>

程序4.4

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%!

int count = 0;

public void jspInit(){ // 覆盖jspInit()

n("");

}

public void jspDestroy(){ // 覆盖jspDestroy()

n("");

}

%>

jspInit and jspDestroy

<%count++;%>

覆盖jspInit()和jspDestroy()！

该页面被访问<%=count%>次。

程序4.5

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ page errorPage="" %>

<%

if (ameter("name")==null){

throw new RuntimeException("没有指定name 请求参数。");

}

%>

Hello, <%=ameter("name")%>

程序4.6

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ page isErrorPage="true" %>

页面发生了下面错误：<%=sage()%>

请重试！

程序4.7

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

compute area of a circle

<%

String s = ameter("radius");

if(s==null)

s = "0";

r = ouble(s);

%>

请输入圆的半径：

半径为<%= r %>的圆的面积为：<%=area(r)%>

<%!

double r = 0; // 声明一个变量r

double area(double r) { // 声明求圆面积的方法

return r * r * ;

}

%>

程序4.8

<%@ page contentType="text/html;charset=utf-8"%>

Compute Prime

<%

for(int n = 2;n < 100;n++){

int i;

for(i = 2;i < n;i++){

if(n % i==0)

break;

}

if(i==n){

%>

<%=n%>  

<%

}

}

%>

程序4.9 todayDate_

…

public void _jspService( HttpServletRequest request,

HttpServletResponse response)

throws IOException,ServletException {

// 其他代码

PageContext pageContext = null;

HttpSession session = null;

ServletContext application = null;

ServletConfig config = null;

JspWriter out = null;

Object page = this;

// 创建有关对象的代码

pageContext = _eContext(this, request, response,

null, true, 8192, true);

session = sion();

application = vletContext();

config = vletConfig();

out = ();

// 其他代码

}

程序4.10

<%@ page isErrorPage='true' %>

<%@ page contentType="text/html;charset=utf-8"%>

页面发生了下面错误：<%=ng()%>

程序4.11

<%@ page contentType="text/html;charset=utf-8" %>

Hello

My name is Duke. What is yours?

<%! String userName="Duke"; %>

<%@include file="" %>

程序4.12

<%@ page contentType="text/html;charset=utf-8" %>

<% userName=ameter("username");%>

Hello, <%=userName%>!

程序4.13

<%@ page contentType="text/html;charset=UTF-8"%>

Hello

My name is Duke. What is yours?

<% String userName = ameter("username");

ribute("username",userName);

%>

程序4.14

<%@ page contentType="text/html;charset = UTF-8" %>

<% String userName = (String)ribute("username");%>

Hello, <%=userName%>!

程序4.15

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

站点首页面

<%@ include file=""%>

<%@ include file=""%>

<%@ include file=""%>

程序4.16

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

用户名

密 码

程序4.17

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

商品分类

程序4.18

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

圣诞惊喜！买酷派w706，赢取ipad2！

三星 S5830领取手机节优惠券，立减100元！再送：200元移动手机卡！

派派价：2068元

联想（Lenovo）G460AL-ITH 14.0英寸笔记本电脑（i3-370M 2G 500G 512

独显 DVD刻录 摄像头 Win7)特价：3199元！

程序4.19

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

关于我们|联系我们|人才招聘|友情链接

Copyright © 2012 派派电子商城有限责任公司,8899123.

程序4.20

package ;

public class Customer{

// 属性声明

private String custName;

private String email;

private String phone;

// 构造方法的定义

public Customer(){}

public Customer(String custName, String email, String phone){

me = custName;

= email;

= phone;

}

// getter方法

public String getCustName(){ return me; }

public String getEmail(){ return ; }

public String getPhone(){ return ; }

// setter方法

public void setCustName(String custName){ me = custName; }

public void setEmail(String email){ = email; }

public void setPhone(String phone){ = phone; }

}

程序4.21

<%@ page contentType="text/html; charset=UTF-8" %>

输入客户信息

输入客户信息

客户名：
邮件地址：
电话：

程序4.22

package ;

import t.*;

import .*;

import vlet;

@WebServlet("/CustomerServlet")

public class CustomerServlet extends HttpServlet {

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ption,ServletException {

String name = ameter("custName");

String email = ameter("email");

String phone = ameter("phone");

Customer customer = new Customer(name,email,phone);

HttpSession session = sion();

synchronized(session) {

ribute("customer", customer);

}

RequestDispatcher rd =

uestDispatcher("/");

d(request,response);

}

}

程序4.23

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

显示客户信息

客户信息如下

客户名:
Email地址:
电话:

程序5.1

Expression Language Example

JSP Expression Language Example

ExpressionValue
${2+5} ${2+5}
${4/5}${4/5}
${5 div 6}${5 div 6}
${5 mod 7}${5 mod 7}
${2<3}${2 < 3}
${2gt3}${2 gt 3}
${3.1 le 3.2}${3.1 le 3.2}
${(5>3)?5:3}${(5>3)?5:3}
${empty null}${empty null}
${empty param}${empty param}

程序5.2

package ;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/VariableServlet")

public class VariableServlet extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

ribute("attrib1", new Integer(100));

HttpSession session = sion();

ribute("attrib2", "Java World!");

ServletContext application = getServletContext();

ribute("attrib3",new ());

ribute("attrib4", "请求作用域");

ribute("attrib4", "会话作用域");

ribute("attrib4", "应用作用域");

// 请求转发到JSP页面

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

程序5.3

<%@ page contentType="text/html;charset=UTF-8" %>

访问作用域变量

访问作用域变量

  • 属性1: ${attrib1}

  • 属性2: ${attrib2}

  • 属性3: ${attrib3}

  • 属性4: ${attrib4}

程序5.4

package ;

public class Address implements izable {

private String city;

private String street;

private String zipCode;

public Address() { }

public Address(String city,String street,String zipCode) {

=city;

=street;

e=zipCode;

}

// 这里省略了属性的getter方法和setter方法

}

程序5.5

package ;

public class Employee implements izable{

private String empName;

private String email;

private String phone;

private Address address;

public Employee(){}

public Employee(String empName,String email,

String phone,Address address ){

e=empName;

=email;

=phone;

s=address;

}

public void setEmpName(String empName){ e = empName; }

public void setEmail(String email) { = email; }

public void setPhone(String phone) { = phone; }

public void setAddress(Address address){ s=address;}

public String getEmpName(){ return e; }

public String getEmail() { return ; }

public String getPhone() { return ; }

public Address getAddress(){ return address; }

}

程序5.6

package ;

import .*;

import t.*;

import .*;

import s;

import ee;

import vlet;

@WebServlet("/EmployeeServlet")

public class EmployeeServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

Address address = new Address("上海市",

"科技路25号","201600");

Employee employee = new Employee("automan",

"**************","8899123",address);

ribute("employee", employee);

RequestDispatcher rd =

uestDispatcher("/");

d(request, response);

}

}

程序5.7

<%@ page contentType="text/html;charset = UTF-8" %>

访问JavaBeans的属性

使用EL访问JavaBeans的属性

  • 员工名：${e}

  • Email地址：${}

  • 电话：${}

  • 客户地址：

    • 城市：${}

    • 街道：${}

    • 邮编：${e}

程序5.8

package ;

import .*;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/CollectServlet")

public class CollectServlet extends HttpServlet{

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

tentType("text/html;charset=UTF-8");

ArrayList country = new ArrayList();

("China");

("England");

("Russia");

HashMap capital = new HashMap();

("China","北京");

("England","伦敦");

("Russia","莫斯科");

ribute("country",country);

ribute("capital",capital);

RequestDispatcher rd =

uestDispatcher("/");

d(request,response);

}

}

程序5.9

<%@ page contentType="text/html;charset=UTF-8" %>

Collections Test

Accessing Collections

  • Capital of ${country[0]} is ${capital["China"]}

  • Capital of ${country[1]} is ${capital["England"]}

  • Capital of ${country[2]} is ${}

程序5.10

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".*" %>

EL隐含变量的使用

<%

Address address = new Address("上海",

"科技路25号","201600");

Employee employee = new Employee("automan",

"**************","8899123",address);

ribute("employee", employee);

Cookie cookie = new Cookie("userName","Hacker");

kie(cookie);

%>

EL隐含变量的使用

EL表达式值
${} ${}
${me}${me}
${}${}
${} ${}
${}${}
${} ${}

程序6.1

package ;

import .*;

import .*;

import .*;

public class HelloTag implements SimpleTag{

JspContext jspContext = null;

JspTag parent = null;

public void setJspContext(JspContext jspContext){

text = jspContext;

}

public void setParent(JspTag parent){

= parent;

}

public void setJspBody(JspFragment jspBody){

}

public JspTag getParent(){

return parent;

}

public void doTag() throws JspException, IOException{

JspWriter out = ();

("Hello, A simple tag.

");

("现在时间是："+ new ());

}

}

程序6.2

xmlns:xsi="/2001/XMLSchema-instance"

xsi:schemaLocation="/xml/ns/j2ee

/xml/ns/j2ee/web-jsptaglibrary_2_"

version="2.1">

1.0

TagExample

/sample

hello

ag

empty

程序6.3

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Using Custom Tag

Hello Tag Example

程序6.4

package ;

import .*;

import .*;

import .*;

public class RedStarTag extends SimpleTagSupport {

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

("*");

}

}

程序6.5

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib uri="/sample" prefix="demo" %>

User Register

请输入客户信息，带的域必须填写。

客户名
Email地址
电话

程序6.6

package ;

import .*;

import .*;

import .*;

public class WelcomeTag extends SimpleTagSupport {

private String user;

public void setUser(String user) {

= user;

}

public void doTag() throws JspException, IOException {

JspWriter out = getJspContext().getOut();

try{

if (user==null){

("Welcome, Guest!

");

}else{

("Welcome, "+user+"!

");

}

} catch(Exception e){

throw new JspException("Error in ()");}

}

}

程序6.7

<%@ taglib prefix="demo" uri="/sample" %>

Welcome Tag

程序6.8

package ;

import .*;

import .*;

import .*;

public class BodyTagDemo extends SimpleTagSupport{

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

("输出标签体前


");

// 获得标签体内容并发送到JSP显示

getJspBody().invoke(null);

("
输出标签体后

");

}

}

程序6.9

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="demo" uri="/sample" %>

Tag With Body

Tag with body

这是标签体内容.

程序6.10

package ;

import .*;

import .*;

import .*;

public class MarkerTag extends SimpleTagSupport {

private String search = null; // search属性

public void setSearch(String search){

= search;

}

public void doTag() throws JspException, IOException{

JspWriter out = getJspContext().getOut();

StringWriter sw = new StringWriter();

getJspBody().invoke(sw);

String text = ng();

int len = ();

int oldIndex=0, newIndex=0;

while((newIndex = f(search,oldIndex))>=0){

if (newIndex

break;

}

(ing(oldIndex,newIndex));

(""+search+"");

oldIndex = newIndex + len;

}

(ing(oldIndex));

}

}

程序6.11

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Tag With Body

she sells sea shells on the sea shore!

程序6.12

package ;

import .*;

import .*;

import .*;

public class LoopTag extends SimpleTagSupport{

private int count = 0;

public void setCount(int count){

= count;

}

public void doTag() throws JspException,IOException{

JspWriter out = getJspContext().getOut();

StringWriter sw = new StringWriter();

getJspBody().invoke(sw);

String text = ng();

for(int i = 1;i<=count;i++){

(""+text+"");

}

}

}

程序6.13

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Loop Tag Example

这是标签体内容！

程序6.14

package ;

// 这里省略了若干导入语句

@WebServlet("/ProductServlet")

public class ProductServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

Connection dbconn = null;

public void init() {

String driver = "";

String dburl = "jdbc:postgresql://127.0.0.1:5432/postgres";

String username = "postgres";

String password = "postgres";

try{

e(driver); // 加载驱动程序

// 创建连接对象

dbconn = nection(

dburl,username,password);

}catch(ClassNotFoundException e1){

}catch(SQLException e2){}

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

ArrayList prodList = null;

prodList = new ArrayList();

try{

String sql="SELECT * FROM products WHERE prod_id < 'P4'";

PreparedStatement pstmt = eStatement(sql);

ResultSet result = eQuery();

while(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

(product);

}

if(!y()){

sion().setAttribute("prodList",prodList);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

}

程序6.15

package ;

import .*;

import .*;

import .*;

import .*;

import t;

public class ProductTag extends SimpleTagSupport{

private ArrayList productList;

public void setProductList(ArrayList productList){

tList = productList;

}

public void doTag() throws JspException, IOException{

for(Product product:productList){

getJspContext().setAttribute("product", product);

getJspBody().invoke(null);

}

}

}

程序6.16

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

商品信息

商品号商品名价格库存量
${_id} ${} ${} ${}

程序6.17

package ;

import .*;

import .*;

import .*;

public class MathTag extends SimpleTagSupport

implements DynamicAttributes{

double num = 0;

String output = "";

public void setNum(double num){

= num;

}

public void setDynamicAttribute(String uri, String localName,

Object value ) throws JspException{

double val = ouble((String)value);

if (localName == "min"){

output = output + " "+num+"与"+val+"的最小值" +

"" + (num, val) + "";

} else if (localName == "max"){

output = output + " "+num+"与"+val+"的最大值" +

"" + (num, val) + "";

} else if (localName == "pow"){

output = output + ""+num+" 的 "+val+

" 次方"+""+(num, val)+"";

}

}

public void doTag() throws JspException, IOException{

getJspContext().getOut().print(output);

}

}

程序6.18

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

动态属性

动态属性的使用

程序6.19

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib prefix="demo" uri="/sample" %>

Hello!

Good Bye!!

I am Dumb

程序6.20

package ;

import .*;

import .*;

import .*;

public class SwitchTag extends SimpleTagSupport{

private String conditionValue;

private boolean caseFound = false;

public void setConditionValue(String value) {

ionValue =value;

}

public String getConditionValue() {

return conditionValue;

}

public void setCaseFound(boolean caseFound){

und = caseFound;

}

public boolean getCaseFound(){

return caseFound;

}

public void doTag() throws JspException,IOException{

if (("")){

getJspContext().getOut().print

("You did not provide 'action' parameter.");

}else{

getJspBody().invoke(null);

}

}

}

程序6.21

package ;

import .*;

import .*;

import .*;

public class CaseTag extends SimpleTagSupport{

private String caseValue;

public void setCaseValue(String caseValue){

lue = caseValue;

}

public void doTag() throws JspException,IOException{

SwitchTag parent =(SwitchTag) getParent(); // 返回父标签引用

String conditionValue = ditionValue();

if ((caseValue)){

eFound(true);

getJspBody().invoke(null);

}else{

return; // 不执行标签体

}

}

}

程序6.22

package ;

import .*;

import .*;

import .*;

public class DefaultTag extends SimpleTagSupport {

public void doTag() throws JspException,IOException{

SwitchTag parent =(SwitchTag) getParent();

if(eFound()){

return;

}else{

getJspBody().invoke(null);

}

}

}

程序6.23

<%@ page contentType="text/html; charset=UTF-8" %>

<%@ taglib prefix="c" uri="/jsp/jstl/core" %>

Set Tag Example

OLYMPUS数码相机

程序6.24

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

${y}*${x}=${x*y}

程序6.25 foreach_

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

Example of forEach

Example of forEach
value of x t
${x} ${} ${t} ${} ${} ${}

程序6.26

package ;

import ption;

import tDispatcher;

import tException;

import vlet;

import rvlet;

import rvletRequest;

import rvletResponse;

import ;

import ist;

import ;

@WebServlet("/BooksServlet")

public class BooksServlet extends HttpServlet {

@Override

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

List books = new ArrayList();

Book book1 = new Book("978-7-302-23059-5","Java语言程序设计",45.00);

Book book2 = new Book("978-7-302-21540-0","Java Web编程技术",39.00);

Book book3 = new Book("978-7-302-24130-0","C #入门经典",99.80);

(book1);

(book2);

(book3);

ribute("books", books);

RequestDispatcher rd = uestDispatcher("/");

d(request, response);

}

}

程序6.27

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ page import=".*," %>

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

图书列表

varStatus="status">

<%--为奇数行和偶数行设置不同的背景颜色--%>

<%--用EL访问作用域变量的成员--%>

书号书名价格
${} ${} ${}

程序6.28

<%@ page contentType="text/html;charset=UTF-8" %>

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

value="白日依山尽,黄河入海流,欲穷千里目,更上一层楼" />

登鹳雀楼 王之涣

${line}

程序6.29

<%@ taglib uri="/jsp/jstl/core" prefix="c" %>

<%@ page contentType="text/html;charset=UTF-8" %>

Welcome Page

You are welcome to my home page!

程序6.30

<%@ page contentType="text/html; charset=UTF-8"%>

关于我们|联系我们|人才招聘|友情链接

Copyright © 2012 派派电子商城有限责任公司,8899123.

E-mail Address:${}

程序7.1

package ;

import izable;

public class Product implements Serializable {

private String prod_id;

private String pname;

private double price;

private int stock;

public Product() { }

public Product(String prod_id, String pname,

double price, int stock) {

_id = prod_id;

= pname;

= price;

= stock;

}

public String getProd_id() {

return prod_id;

}

public void setProd_id(String prod_id) {

_id = prod_id;

}

public String getPname() {

return pname;

}

public void setPname(String pname) {

= pname;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

= price;

}

public int getStock() {

return stock;

}

public void setStock(int stock) {

= stock;

}

}

程序7.2

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

商品查询

请输入商品号：

查询所有商品

程序7.3

package ;

import .*;

import .*;

import .*;

import t.*;

import .*;

import vlet;

@WebServlet("/")

public class QueryProductServlet extends HttpServlet{

private static final long serialVersionUID = 1L;

Connection dbconn = null;

public void init() {

String driver = "";

String dburl = "jdbc:postgresql://127.0.0.1:5432/postgres";

String username = "postgres";

String password = "postgres";

try{

e(driver); // 加载驱动程序

// 创建连接对象

dbconn = nection(

dburl,username,password);

}catch(ClassNotFoundException e1){

n(e1);

}catch(SQLException e2){}

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

String productid = ameter("productid");

try{

String sql="SELECT * FROM products WHERE prod_id = ?";

PreparedStatement pstmt = eStatement(sql);

ing(1,productid);

ResultSet rst = eQuery();

if(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

sion().setAttribute("product", product);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

ArrayList productList = null;

productList = new ArrayList();

try{

String sql="SELECT * FROM products";

PreparedStatement pstmt = eStatement(sql);

ResultSet result = eQuery();

while(()){

Product product = new Product();

d_id(ing("prod_id"));

me(ing("pname"));

ce(ble("price"));

ck(("stock"));

(product);

}

if(!y()){

sion().setAttribute("productList",productList);

direct("/helloweb/");

}else{

direct("/helloweb/");

}

}catch(SQLException e){

tackTrace();

}

}

public void destroy(){

try {

();

}catch(Exception e){

tackTrace();

}

}

}

程序7.4

<%@ page contentType="text/html; charset=utf-8" %>

scope="session">

商品信息

商品号：
商品名：
价格：
库存量：

程序7.5

<%@ page contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ page import=".*,t" %>

显示所有商品

<% ArrayList productList =

(ArrayList)ribute("productList");

for(Product product:productList){

%>

<%

}

%>

商品号商品名价格数量
<%=d_id() %> <%=me() %> <%=ce() %> <%=ck() %>

程序7.6

<%@ page contentType="text/html; charset=UTF-8" %>

该商品不存在。返回

程序7.7

name="jdbc/sampleDS"

type="urce"

maxActive="4"

maxIdle="2"

username="paipaistore"

maxWait="5000"

driverClassName=""

password="paipaistore"

url="jdbc:postgresql://localhost:5432/paipaistore"/>

程序7.8

package ;

import .*;

import .*;

import urce;

import t.*;

import vlet;

import .*;

import t;

import .*;

import .*;

@WebServlet("/")

public class ProductQueryServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

DataSource dataSource;

public void init() {

try {

Context context = new InitialContext();

dataSource =

(DataSource)("java:comp/env/jdbc/sampleDS");

}catch(NamingException ne){

n("Exception:"+ne);

}

}

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

Connection dbconn = nection();

// 代码同程序7.3的doPost()

}

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

Connection dbconn = nection();

// 代码同程序7.3的doGet()

}

}

程序7.9

global = "jdbc/paipaistore"

name = "jdbc/sampleDS"

type = "urce"/>

WEB-INF/

程序7.10

package ;

import izable;

public class Customer implements Serializable{

private String cust_id;

private String cname;

private String email;

private double balance;

public String getCust_id() {

return cust_id;

}

public void setCust_id(String cust_id) {

_id = cust_id;

}

public String getCname() {

return cname;

}

public void setCname(String cname) {

= cname;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

= email;

}

public double getBalance() {

return balance;

}

public void setBalance(double balance) {

e = balance;

}

}

程序7.11

package ;

import .*;

import urce;

import .*;

public class BaseDao {

DataSource dataSource;

// 在构造方法中返回数据源对象

public BaseDao () {

try {

Context context = new InitialContext();

dataSource =

(DataSource)("java:comp/env/jdbc/sampleDS");

}catch(NamingException ne){

n("Exception:"+ne);

}

}

// 返回一个连接对象

public Connection getConnection()throws Exception{

return nection();

}

}

程序7.12

package ;

import .*;

import ist;

import er;

public class CustomerDao extends BaseDao{

// 插入一条客户记录

public boolean addCustomer(Customer customer){

String sql = "INSERT INTO customers" +

"(cust_id,cname,email,balance)VALUES(?,?,?,?)";

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql))

{

ing(1,t_id());

ing(2,me());

ing(3,il());

ble(4,ance());

eUpdate();

return true;

}catch(SQLException se){

tackTrace();

return false;

}

}

// 按姓名检索客户记录

public Customer findByName(String cname){

String sql = "SELECT cust_id,cname,email,balance" +

" FROM customers WHERE cname=?";

Customer customer = new Customer();

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql)){

ing(1,cname);

try(ResultSet rst = eQuery()){

if(()){

t_id(ing("cust_id"));

me(ing("cname"));

il(ing("email"));

ance(ble("balance"));

}

}

}catch(SQLException se){

return null;

}

return customer;

}

// 查询所有客户信息

public ArrayList findAllCustomer(){

Customer customer = new Customer();

ArrayList custList = new ArrayList();

String sql = "SELECT * FROM customers";

try(

Connection conn = nection();

PreparedStatement pstmt = eStatement(sql);

ResultSet rst = eQuery()){

while(()){

t_id(ing("cust_id"));

me(ing("cname"));

il(ing("email"));

ance(ble("balance"));

(customer);

}

return custList;

}catch(SQLException e){

tackTrace();

return null;

}

}

}

程序7.13

<%@ page contentType="text/html; charset=UTF-8" %>

Input a Customer

${result}

请输入一条客户记录

客户号：
客户名：
Email：
余额：

程序7.14

package ;

import .*;

import t.*;

import .*;

import er;

import erDao;

import vlet;

@WebServlet("/")

public class AddCustomerServlet extends HttpServlet{

public void doPost(HttpServletRequest request,

HttpServletResponse response)

throws ServletException,IOException{

CustomerDao dao = new CustomerDao();

Customer customer = new Customer();

String message = null;

try{

t_id(ameter("cust_id"));

// 将传递来的字符串重新使用utf-8编码，以免产生乱码

me(new String(ameter("cname")

.getBytes("iso-8859-1"),"UTF-8"));

il(new String(ameter("email")

.getBytes("iso-8859-1"),"UTF-8"));

ance(

ouble(ameter("balance")));

boolean success = tomer(customer);

if(success){

message = "

  • 成功插入一条记录！
    • ";

    }else{

    message = "

  • 插入记录错误！
    • ";

    }

    }catch(Exception e){

    message = "

  • 插入记录错误！
    • ";

    }

    ribute("result", message);

    RequestDispatcher rd =

    getServletContext().getRequestDispatcher("/");

    d (request,response);

    }

    }

    程序8.1

    package er;

    import .*;

    import ;

    import t.*;

    import .*;

    import tener;

    @WebListener // 使用注解注册监听器

    public class MyContextListener implements ServletContextListener,

    ServletContextAttributeListener{

    private ServletContext context = null;

    public void contextInitialized(ServletContextEvent sce){

    Context ctx = null;

    DataSource dataSource = null;

    context = vletContext();

    try{

    if(ctx == null){

    ctx = new InitialContext();

    }

    dataSource = (DataSource)("java:comp/env/jdbc/sampleDS");

    }catch(NamingException ne){

    ("Exception:"+ne);

    }

    ribute("dataSource",dataSource); // 添加属性

    ("应用程序已启动："+new Date());

    }

    public void contextDestroyed(ServletContextEvent sce){

    context = vletContext();

    Attribute("dataSource");

    ("应用程序已关闭："+new Date());

    }

    public void attributeAdded(ServletContextAttributeEvent sce){

    context = vletContext();

    ("添加一个属性："+e()+"："+ue());

    }

    public void attributeRemoved(ServletContextAttributeEvent sce){

    context = vletContext();

    ("删除一个属性："+e()+"："+ue());

    }

    public void attributeReplaced(ServletContextAttributeEvent sce){

    context = vletContext();

    ("替换一个属性："+e()+"："+ue());

    }

    }

    程序8.2

    <%@ page contentType="text/html;charset=UTF-8" %>

    <%@ page import=".*,.*" %>

    <%

    DataSource dataSource =

    (DataSource)ribute("dataSource");

    Connection conn = nection();

    Statement stmt = Statement();

    ResultSet rst = eQuery(

    "SELECT * FROM products WHERE prod_id>'P2'");

    %>

    Listener Demo

    商品表中信息

    <% while (()){ %>

    <% } %>

    商品号商品名价格库存
    <%= ing(1) %> <%= ing(2) %> <%= ble(3) %> <%= (4) %>

    程序8.3

    package er;

    import rvletRequest;

    import tRequestEvent;

    import tRequestListener;

    import tener;

    @WebListener

    public class MyRequestListener

    implements ServletRequestListener{

    private int count = 0;

    public void requestInitialized(ServletRequestEvent re){

    HttpServletRequest request=

    (HttpServletRequest)vletRequest();

    if(uestURI().endsWith("")){

    count++;

    vletContext().setAttribute("count",new Integer(count));

    }

    }

    public void requestDestroyed(ServletRequestEvent re){

    }

    }

    程序8.4

    <%@ page contentType="text/html;charset=UTF-8" %>

    请求监听器示例

    欢迎您，您的IP地址是${Addr}

    自应用程序启动以来，该页面被访问了

    ${}

    次

    程序8.5

    package er;

    import t.*;

    import .*;

    import ist;

    import tener;

    @WebListener

    public class MySessionListener implements HttpSessionListener{

    private ServletContext context = null;

    public void sessionCreated(HttpSessionEvent se){

    HttpSession session = sion();

    context = vletContext();

    ArrayList sessionList = (ArrayList)

    ribute("sessionList");

    if(sessionList==null){

    sessionList = new ArrayList();

    ribute("sessionList",sessionList);

    }else{

    (session);

    }

    ("创建一个会话："+());

    }

    public void sessionDestroyed(HttpSessionEvent se){

    HttpSession session = sion();

    context = vletContext();

    ArrayList sessionList = (ArrayList)

    ribute("sessionList");

    (session);

    ("销毁一个会话："+());

    }

    }

    程序8.6

    <%@ page contentType="text/html;charset=UTF-8" %>

    <%@ page import=".* " %>

    <%@ taglib prefix="c" uri="/jsp/jstl/core" %>

    会话监听器示例

    程序8.7

    package er;

    import .*;

    public class User implements HttpSessionBindingListener{

    public String username = "";

    public String password = "";

    public User(){}

    public User(String username,String password){

    me = username;

    rd = password;

    }

    public void valueBound(HttpSessionBindingEvent e){

    HttpSession session = sion();

    vletContext().log("用户名:"+username

    +", 口令:"+password+" 登录系统.");

    }

    public void valueUnbound(HttpSessionBindingEvent e){

    HttpSession session = sion();

    vletContext().log("用户名:"+username

    +"口令:"+password+" 退出系统.");

    }

    }

    程序8.8

    package ;

    import t.*;

    import .*;

    import .*;

    import .*;

    import ;

    import vlet;

    @WebServlet("/")

    public class LoginServlet extends HttpServlet{

    public void doPost(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException, ServletException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    String username = ameter("username");

    String password = ameter("password");

    DataSource dataSource =

    (DataSource)getServletContext().getAttribute("dataSource");

    try{

    Connection conn = nection();

    String sql = "SELECT * FROM users WHERE username=? AND password=?";

    PreparedStatement pstmt = eStatement(sql);

    ing(1,username);

    ing(2,password);

    ResultSet rst = eQuery();

    boolean valid = ();

    if(valid){

    User validuser = new User(username,password);

    sion().setAttribute("user", validuser);

    n("欢迎您,"+username);

    }else{

    direct("");

    }

    }catch(Exception e){

    log("产生异常：" + sage());

    }

    }

    }

    程序8.9

    package ;

    import ption;

    import t.*;

    import ter;

    import rvletRequest;

    @WebFilter(filterName = "logFilter", urlPatterns = { "/*" })

    public class LogFilter implements Filter {

    private FilterConfig config;

    // 实现初始化方法

    public void init(FilterConfig fConfig) throws ServletException {

    = fConfig;

    }

    // 实现过滤方法

    public void doFilter(ServletRequest request, ServletResponse response,

    FilterChain chain) throws IOException, ServletException {

    // 获得应用上下文对象

    ServletContext context = vletContext();

    // 返回请求对象

    HttpServletRequest hrequest = (HttpServletRequest)request;

    // 记录开始过滤时间

    long start = tTimeMillis();

    n("用户地址："+oteAddr());

    n("请求的资源："+uestURI());

    ("请求的资源："+uestURI());

    ("用户地址："+oteAddr());

    // 请求转到下一资源或下一过滤器

    er(request, response);

    // 记录返回到过滤器时间

    long end = tTimeMillis();

    n("请求的总时间："+(end - start)+"毫秒");

    ("请求的总时间："+(end - start)+"毫秒");

    }

    // 实现销毁方法

    public void destroy() {

    = null;

    }

    }

    程序8.10

    package ;

    import ption;

    import t.*;

    import ter;

    import tParam;

    import .*;

    @WebFilter(

    filterName = "authorityFilter",

    urlPatterns = { "/*" },

    initParams = {

    @WebInitParam(name = "encoding", value = "UTF-8"),

    @WebInitParam(name = "loginPage", value = ""),

    @WebInitParam(name = "proLogin", value = "")

    })

    public class AuthorityFilter implements Filter {

    private FilterConfig config;

    // 实现初始化方法

    public void init(FilterConfig fConfig) throws ServletException {

    config = fConfig;

    }

    // 实现过滤方法

    public void doFilter(ServletRequest request, ServletResponse response,

    FilterChain chain) throws IOException, ServletException {

    // 获取该过滤器的配置参数

    String encoding = tParameter("encoding");

    String loginPage = tParameter("loginPage");

    String proLogin = tParameter("proLogin");

    // 设置请求request的编码字符集

    racterEncoding(encoding);

    HttpServletRequest hrequest = (HttpServletRequest)request;

    HttpSession session = sion(true);

    // 获得客户请求的页面

    String requestPath = vletPath();

    // 如果session作用域的user为null，表明没有登录

    // 即用户请求的既不是登录页面，也不是处理登录的页面

    if(ribute("user")==null

    &&!th(loginPage)

    &&!th(proLogin)){

    //转发到登录页面

    ribute("message","您还没有登录！");

    uestDispatcher(loginPage)

    .forward(request, response);

    }else{

    er(request, response);

    }

    }

    // 实现销毁方法

    public void destroy() {

    config = null;

    }

    }

    程序8.11

    package ;

    import t.*;

    import .*;

    import .*;

    import tion.*;

    @WebServlet(

    name = "calculatorServlet",

    urlPatterns = { "/" },

    initParams = {

    @WebInitParam(name = "sleepTime", value = "2000")

    })

    public class CalculatorServlet extends HttpServlet{

    private int result;

    private int sleepTime;

    public void init(){

    String sleep_time = getInitParameter("sleepTime");

    sleepTime = getNumber(sleep_time);

    }

    public void doPost(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException,ServletException {

    racterEncoding("UTF-8");

    String value1 = ameter("value1");

    int v1 = getNumber(value1);

    String value2 = ameter("value2");

    int v2 = getNumber(value2);

    String op = ameter("submit");

    if(("相加")){

    result = v1 + v2;

    }else{

    result = v1 - v2;

    }

    try{

    (sleepTime); // 当前线程睡眠指定时间

    }catch(InterruptedException e){

    log("Exception during sleeping.");

    }

    try{

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    n("");

    n(v1 +"与"+ v2 + op +"结果是"+result);

    n("");

    }catch(Exception e){

    log("Error writing output.");

    }

    }

    private int getNumber(String s){

    int result = 0;

    try{

    result = nt(s);

    }catch(NumberFormatException e){

    log("Error Parseing "+s);

    }

    return result;

    }

    }

    程序8.12

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    Calculator

    操作数1:

    操作数2:

    程序8.13

    package ;

    import ption;

    import riter;

    import ontext;

    import tException;

    import vlet;

    import rvlet;

    import rvletRequest;

    import rvletResponse;

    @WebServlet(urlPatterns="/asyncDemo",asyncSupported=true)

    public class AsyncDemoServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    n("异步调用示例");

    n("");

    n("进入Servlet的时间："+new ()+".

    ");

    ();

    AsyncContext actx = sync();

    eout(30*1000); // 设置异步调用的超时时长30秒

    // 启动异步调用的线程

    (new Executor(actx));

    n("结束Servlet的时间："+new ()+".
    ");

    ();

    }

    }

    程序8.14

    package ;

    import t.*;

    import .*;

    import ;

    public class Executor implements Runnable{

    private AsyncContext actx=null;

    public Executor(AsyncContext actx){

    =actx;

    }

    // 实现线程体的run()

    public void run(){

    try{

    // 等待10秒钟，以模拟业务方法的执行

    (10000);

    PrintWriter out=ponse().getWriter();

    n("业务处理完毕的时间："+new Date()+".");

    ();

    te(); // 结束异步线程

    }catch(Exception e){

    tackTrace();

    }

    }

    }

    程序8.15

    package er;

    import istener;

    import vent;

    import tion.*;

    import ption;

    public class MyAsyncListener implements AsyncListener{

    @Override

    public void onStartAsync(AsyncEvent event)throws IOException{

    n("异步调用开始。");

    }

    public void onComplete(AsyncEvent event)throws IOException {

    n("异步调用完成。");

    }

    public void onError(AsyncEvent event)throws IOException {

    n("异步调用出错。");

    }

    public void onTimeout(AsyncEvent event)throws IOException {

    n("异步调用超时。");

    }

    }

    程序8.16

    package ;

    import ption;

    import ontext;

    import tException;

    import vlet;

    import rvlet;

    import rvletRequest;

    import rvletResponse;

    import cListener;

    @WebServlet(name="AsyncListenerServlet",

    urlPatterns={"/asyncListener"},

    asyncSupported=true)

    public class AsyncListenerServlet extends HttpServlet {

    private static final long serialVersionUID = 222L;

    @Override

    protected void doGet(final HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    final AsyncContext asyncContext = sync();

    eout(5000);

    // 注册监听器

    tener(new MyAsyncListener());

    n("主线程输出...");

    n("主线程名："+tThread().getName());

    (new Runnable(){

    @Override

    public void run(){

    try{

    (3000); // 睡眠3秒钟

    }catch(InterruptedException e){ }

    String greeting = "Hi from worker thread";

    n("异步线程输出...");

    n("异步线程名："

    +tThread().getName());

    ribute("greeting", greeting);

    ch("/");

    }

    });

    }

    }

    程序9.1

    程序9.2

    package ;

    import .*;

    import t.*;

    import .*;

    import vlet;

    @WebServlet("/")

    public class AccountServlet extends HttpServlet{

    public void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException,ServletException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    n("");

    n("Declarative Security Example");

    n("");

    n("");

    String name = oteUser();

    n("欢迎您, "+name+"!");

    n("

    能够访问该页面，说明你是管理员（manager）。");

    n("");

    }

    public void doPost(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException, ServletException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    n("");

    n("Declarative Security Example");

    n("");

    n("");

    n("欢迎你！

    ");

    n("HTTP POST请求对所有用户开放！");

    n("");

    }

    }

    程序9.3

    <%@ page contentType="text/html;charset=UTF-8" %>

    登录页面

    请您输入用户名和口令

    用户名：

    口  令：

    程序9.4

    <%@ page contentType="text/html;charset=UTF-8" %>

    错误页面

    对不起，用户名或口令不正确！

    请返回重新登录：返回

    程序9.5

    package ;

    import .*;

    import t.*;

    import .*;

    import 64Encoder;

    import 64Decoder;

    public class AuthorizationServlet extends HttpServlet{

    public void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException,ServletException {

    String authorization = der("Authorization");

    if (authorization == null){

    askForPassword(response);

    } else {

    // 从Authorization请求头中解析出用户名和口令

    String userInfo = ing(6).trim();

    BASE64Decoder decoder = new BASE64Decoder();

    String nameAndPassword = new String(Buffer(userInfo));

    int index = f(":");

    String username = ing(0, index);

    String password = ing(index+1);

    if (InRole("director")) {

    showDirectorPage(request, response);

    }else if (InRole("employee")){

    showEmployeePage(request, response);

    }

    }

    }

    private void askForPassword(HttpServletResponse response)

    throws IOException {

    // 向客户发送401响应

    der("WWW-Authenticate",

    "BASIC realm="Programatic Test"");

    ror(_UNAUTHORIZED);

    }

    private void showDirectorPage(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    String username = oteUser();

    n("");

    n("Programmatic Security Example");

    n("");

    n("Welcome, "+username+"!");

    n("

    这是为主管（director）产生的页面．");

    n("

    Authorization:"+

    der("Authorization")+"");

    n("");

    }

    private void showEmployeePage(HttpServletRequest request,

    HttpServletResponse response)

    throws IOException {

    tentType("text/html;charset=UTF-8");

    PrintWriter out = ter();

    String username = oteUser();

    n("");

    n("Programmatic Security Example");

    n("");

    n("Welcome, "+username+"!");

    n("

    这是为职员（employee）产生的页面．");

    n("

    Authorization:"+

    der("Authorization")+"");

    n("");

    }

    }

    程序9.6

    xmlns:xsi="/2001/XMLSchema-instance"

    xsi:schemaLocation="/xml/ns/javaee

    /xml/ns/javaee/web-app_3_"

    version="3.0" metadata-complete="true">

    authorizeServlet

    izationServlet

    director

    manager

    employee

    member

    authorizeServlet

    /

    programmatic security

    /

    GET

    manager

    member

    BASIC

    Programatic Test

    manager

    member

    程序10.1

    Database System Concept

    Abraham Silberschatz

    2006.10

    69.50

    数据库系统概论

    王珊

    萨师瑄

    2006.5

    33.80

    计算机应用研究

    2004

    21

    147

    程序10.2

    Simple XMLHttpRequest

    onclick="startRequest();"/>

    程序10.3

    学生查询

    onclick="startRequest();"/>

    程序10.4

    学号姓名性别年龄
    20120101Li Ming男19
    20120102Wang Xiaoming女20
    20120103Liu Hao男18

    程序10.5

    Parseing XML Response with DOM

    XML 文档解析

    onclick="startRequest('books');"/>

    onclick="startRequest('magazines');"/>

    程序10.6

    Dynamically Editing Page Content

    查看图书或杂志

    onclick="startSearch('books');"/>

    onclick="startSearch('magazines');"/>

    程序10.7

    Using Ajax for validation

    Ajax数据验证示例

    用户名：

    程序10.8

    package ;

    import .*;

    import t.*;

    import .*;

    import vlet;

    @WebServlet(name = "validationServlet", urlPatterns = { "/" })

    public class ValidationServlet extends HttpServlet{

    public void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException,IOException{

    tentType("text/xml;charset=UTF-8");

    der("Cache-Control","no-cache");

    String username = ameter("username");

    String message = "用户名可以使用！";

    PrintWriter out = ter();

    //这里的验证非常简单，实际应用可与数据库中用户名比较

    if(("hacker")){

    message = "用户名已被占用！";

    }

    n("");

    n(""+message+"");

    n("");

    }

    }

    程序10.9

    Dynamically Filling Lists

    请选择入学年份和班级

    入学年份:

    班级:



    姓名:

    程序10.10

    package ;

    import .*;

    import ist;

    import ;

    import t.*;

    import .*;

    import vlet;

    @WebServlet(name ="refreshServlet", urlPatterns={"/" })

    public class RefreshNameServlet extends HttpServlet {

    private List students =

    new ArrayList();

    public void init() throws ServletException {

    (new Student(2012, "class1", "李小明"));

    (new Student(2012, "class1", "张冬玫"));

    (new Student(2012, "class2", "赵亮"));

    (new Student(2012, "class2", "王强"));

    (new Student(2012, "class2", "孙文"));

    (new Student(2013, "class1", "Micheal Jordon"));

    (new Student(2013, "class1", "Henry Smith"));

    (new Student(2013, "class2", "Joeory Bush"));

    (new Student(2013, "class2", "Karta"));

    (new Student(2013, "class2", "Luews"));

    }

    protected void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    int syear = nt(ameter("syear"));

    String sclass = ameter("sclass");

    StringBuffer results = new StringBuffer("");

    for(Student stud:students) {

    if(syear == && (sclass)){

    ("");

    ();

    ("");

    }

    }

    ("");

    tentType("text/xml;charset=UTF-8");

    ter().println(ng());

    }

    private class Student{ // 定义内部类

    private int syear; // 入学年份

    private String sclass; // 班级

    private String sname; // 姓名

    public Student(int syear, String sclass, String sname) {

    = syear;

    = sclass;

    = sname;

    }

    }

    }

    程序10.11

    Ajax Tool Tip

    Ajax工具提示示例

    cellspacing="0" cellpadding="2">

    onmouseout="clearData();">

    onmouseout="clearData();">

    onmouseout="clearData();">

    程序10.12

    package ;

    import .*;

    import p;

    import ;

    import t.*;

    import .*;

    import vlet;

    @WebServlet(name ="tooltipServlet", urlPatterns={"/" })

    public class ToolTipServlet extends HttpServlet {

    private Map dogs = new HashMap ();

    public void init(ServletConfig config) throws ServletException {

    ("dog1", "It is a dog!");

    ("dog2", "It is a lovely dog!");

    ("dog3", "It is a very lovely dog!");

    }

    protected void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    String key = ameter("key");

    String data = (key);

    PrintWriter out = ter();

    tentType("text/xml;charset=UTF-8");

    der("Cache-Control", "no-cache");

    n("");

    n("" + data + "");

    n("");

    ();

    }

    }

    程序10.13

    Customer List

    请输入客户信息

    客户名：
    Email地址：
    电话：

    客户信息如下：

    程序10.14

    package ;

    import .*;

    import ;

    import t.*;

    import .*;

    import vlet;

    @WebServlet(name ="customerList", urlPatterns={"/" })

    public class CustomerListServlet extends HttpServlet {

    protected void addCustomer(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    // 可将对象存储到数据库中

    String uniqueID = storeCustomer();

    // 创建响应XML

    StringBuffer xml = new StringBuffer("");

    (uniqueID);

    ("");

    ("1");

    ("");

    // 向浏览器发送响应

    sendResponse(response, ng());

    }

    protected void deleteCustomer(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException{

    String id = ameter("id");

    // 可将客户从数据库中删除

    // 创建响应XML

    StringBuffer xml = new StringBuffer("");

    ("1");

    ("");

    // 向浏览器发送响应

    sendResponse(response, ng());

    }

    protected void doGet(HttpServletRequest request,

    HttpServletResponse response)

    throws ServletException, IOException {

    String action = ameter("action");

    if(("add")) {

    addCustomer(request, response);

    }

    else if(("delete")) {

    deleteCustomer(request, response);

    }

    }

    private String storeCustomer() {

    // 这里可将客户对象保存到数据库中

    String uniqueID = "";

    Random randomizer = new Random(tTimeMillis());

    for(int i = 0; i < 8; i++) {

    uniqueID += t(9);

    }

    return uniqueID;

    }

    private void sendResponse(HttpServletResponse response,

    String responseText)

    throws IOException {

    tentType("text/xml");

    ter().println(responseText);

    }

    }

    程序11.1

    package ate;

    public class Student {

    private Long id;

    private long studentNo;

    private String studentName;

    private int sage;

    private String major;

    public Student() { }

    public Student(long studentNo, String studentName, int sage,

    String major){

    tNo = studentNo;

    tName = studentName;

    = sage;

    = major;

    }

    public Long getId(){

    return id;

    }

    public void setId(Long id){

    = id;

    }

    public long getStudentNo(){

    return studentNo;

    }

    public void setStudentNo(long studentNo){

    tNo = studentNo;

    }

    public String getStudentName(){

    return studentName;

    }

    public void setStudentName(String studentName){

    tName = studentName;

    }

    public int getSage(){

    return sage;

    }

    public void setSage(int sage){

    = sage;

    }

    public String getMajor(){

    return major;

    }

    public void setMajor(String major){

    = major;

    }

    }

    程序11.2

    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "/">

    程序11.3

    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

    "/dtd/">

    jdbc:postgresql://localhost:5432/postgres

    postgres

    postgres

    1

    eSQLDialect

    thread

    eProvider

    true

    validate

    程序11.4

    import uration;

    import eRegistry;

    import eRegistryBuilder;

    import nFactory;

    import n;

    import ction;

    import t;

    public class Main {

    public static void main(String[] args) {

    // 加载配置文件

    Configuration configuration = new Configuration().configure();

    // 创建服务注册对象

    ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()

    .applySettings(perties())

    .buildServiceRegistry();

    // 创建会话工厂对象

    SessionFactory factory =

    essionFactory(serviceRegistry);

    // 创建会话对象

    Session session = ssion();

    // 创建一个事务对象

    Transaction tx = ransaction();

    Student student = new Student();

    dentNo(20120108);

    dentName("王小明");

    e(20);

    or("计算机科学");

    (student); // 将student对象持久化到数据表中

    n("插入学生成功！");

    // 从数据库中读取一个对象

    Student stud = (Student)(, new Long(1));

    n(dentName() + " " + e());

    (); // 提交事务

    ();

    ();

    }

    }

    程序11.5

    package ;

    import ateException;

    import n;

    import nFactory;

    import uration;

    import eRegistry;

    import eRegistryBuilder;

    public class HibernateUtil {

    private static SessionFactory factory;

    private static ServiceRegistry serviceRegistry;

    static{

    try{

    Configuration configuration = new Configuration().configure();

    serviceRegistry = new ServiceRegistryBuilder()

    .applySettings(perties())

    .buildServiceRegistry();

    factory = essionFactory(serviceRegistry);

    }catch(HibernateException e){

    tackTrace();

    }

    }

    // 返回会话工厂对象

    public static SessionFactory getSessionFactory() {

    return factory;

    }

    // 返回一个会话对象

    public static Session getSession() {

    Session session = null;

    if(factory !=null)

    session = ssion();

    return session;

    }

    // 关闭指定的会话对象

    public static void closeSession(Session session){

    if(session !=null){

    if(())

    ();

    }

    }

    }

    程序11.6

    package ;

    import n;

    import ction;

    import t;

    import ateUtil;

    public class StudentDemo{

    public static void main(String[] args) {

    try{

    Session session = sion();

    Transaction tx = ransaction();

    Student student = (Student)(, new Long(1));

    dentName("王晓明");

    (student); // 更新修改后的记录

    (); // 提交事务

    ();

    }catch(HibernateException he){

    tackTrace();

    }

    }

    }

    程序12.1

    package ;

    import Support;

    public class HelloUserAction extends ActionSupport {

    private String message; // 动作属性

    public String getMessage() {

    return message;

    }

    public void setMessage(String message) {

    e = message;

    }

    @Override

    public String execute() throws Exception {

    setMessage("Hello Struts User");

    return SUCCESS;

    }

    }

    程序12.2

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    Basic Struts 2 Application - Welcome

    Welcome To Struts 2!

    Hello User

    程序12.3

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    Hello User!

    程序12.4

    package ;

    public class User{

    private Long id;

    private String username;

    private String password;

    private int age;

    private String email;

    // 这里省略了属性的getter方法和setter方法

    @Override

    public String toString(){

    return "用户名: " + getUsername() +"口令: " + getPassword()

    + "年龄: " + getAge() +" Email:" + getEmail();

    }

    }

    程序12.5

    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "/">

    程序12.6

    package ;

    import ;

    import ateUtil;

    import Support;

    import n;

    import ction;

    import ;

    import ;

    public class RegisterAction extends ActionSupport {

    private User user;

    public User getUser() {

    return user;

    }

    public void setUser(User user) {

    = user;

    }

    @Override

    public String execute() throws Exception {

    return SUCCESS;

    }

    public String register() throws Exception {

    try{

    Session session = sion();

    Transaction tx = ransaction();

    (user); // 将user对象持久化到数据表中

    ();

    return SUCCESS;

    }catch(Exception e){

    tackTrace();

    sion().close();

    return ERROR;

    }

    }

    public String login() throws Exception {

    try{

    Session session = sion();

    Transaction tx = ransaction();

    Query query = Query(

    "from User where username=:uname");

    ameter("uname", rname());

    List list = ();

    ();

    if(()==1){

    return SUCCESS;

    }else

    return ERROR;

    }catch(Exception e){

    tackTrace();

    sion().close();

    return ERROR;

    }

    }

    }

    程序12.7

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    用户注册

    注册一个新用户

    程序12.8

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    登录页面

    请输入用户名和密码：

    tooltip="输入用户名" labelposition="left" />

    tooltip="输入密码" labelposition="left" />

    程序12.9

    <%@ taglib prefix="s" uri="/struts-tags" %>

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    注册成功页面

    注册成功！

    返回 首页

    程序12.10

    <%@ page contentType="text/html;charset=UTF-8"

    pageEncoding="UTF-8"%>

    登录成功

    欢迎登录本系统

    程序12.11

    package ;

    import ;

    public class SampleAction {

    private String message;

    private User user = new User();

    {

    rname("王小明"); // 初始化块

    }

    public String execute() {

    setMessage("世界，你好！");

    return "success";

    }

    public String getMessage(){

    return message;

    }

    public void setMessage(String message){

    e = message;

    }

    public User getUser() {

    return user;

    }

    public void setUser(User user) {

    = user;

    }

    }

    程序12.12

    <%@ page contentType="text/html; charset=UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags"%>

    Sample JSP

    OGNL 示例!

    [0].me:

    me:

    message:

    getMessage():

    程序12.13

    package ;

    public class ConverterBean{

    private double celcius;

    private double fahrenheit;

    public double getCelcius(){

    return (fahrenheit - 32) * 5 / 9;

    }

    public void setCelcius(double celcius){

    s = celcius;

    }

    public double getFahrenheit(){

    return celcius * 9 / 5 + 32;

    }

    public void setFahrenheit(double fahrenheit){

    heit = fahrenheit;

    }

    }

    程序12.14

    <%@ page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    Bean Tag Example!

    Bean Tag Example

    37

    37°C=°F

    程序12.15

    package ;

    import Support;

    import .*;

    public class IteratorAction extends ActionSupport{

    private List fruit;

    private Map country;

    public String execute()throws Exception{

    fruit = new ArrayList();

    ("苹果");

    ("橘子");

    ("香蕉");

    ("草莓");

    country = new HashMap();

    ("China", "北京");

    ("USA", "纽约");

    ("England", "伦敦");

    ("Russia", "莫斯科");

    return SUCCESS;

    }

    public List getFruit(){

    return fruit;

    }

    public Map getCountry(){

    return country;

    }

    }

    程序12.16

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    Iterator Tag Example!

    Iterator Tag Example!

    ,

    国家名首都

    程序12.17

    package ;

    import Support;

    import .*;

    public class SortTagAction extends ActionSupport{

    private List students = null;

    private Comparator myComparator; // 比较器对象

    public String execute()throws Exception{

    students = new ArrayList();

    (new Student(333,"张大海"));

    (new Student(111,"李小雨"));

    (new Student(888,"王天琼"));

    return SUCCESS;

    }

    public Comparator getMyComparator(){

    // 一个匿名内部类，实现Comparator接口

    return new Comparator(){

    // 实现Comparator接口必须实现compare()

    public int compare(Student o1,Student o2){

    return - ;

    }

    };

    }

    public List getStudents() {

    return students;

    }

    public void setStudents(List students) {

    ts = students;

    }

    class Student{ // 内部类定义

    private int id;

    private String name;

    Student(int id,String name){

    = id;

    = name;

    }

    public String toString(){

    return id + " " + name;

    }

    }

    }

    程序12.18

    <%@ page contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ taglib prefix="s" uri="/struts-tags" %>

    Sort标签示例

    comparator="myComparator" >

    程序12.19

    "-//OpenSymphony Group//XWork Validator 1.0.2//EN"

    "/xwork/">

    true

    用户名不能为空！

    true

    口令不能为空！

    6

    14

    口令包含的字符在6到14个之间！

    16

    60

    用户年龄应在16到60之间！

    邮箱地址必填！

    邮箱地址不合法！

    程序12.20

    <%@ taglib uri="/tags-tiles" prefix="tiles"%>

    "/TR/html4/">

    <tiles:insertAttribute name="title" ignore="true" />

    程序12.21

    #header {

    border:1px solid blue;

    background-position:50% 0;

    background-repeat:repeat no-repeat;

    height:100px;

    padding: 10px;

    margin:15px;

    width:780px;

    }

    #mainContent {

    background-color:white;

    margin:0px;

    overflow-x:hidden;

    overflow-y:hidden;

    padding-left:10px;

    padding-right:10px;

    position:relative;

    width:780px;

    }

    #sidebar {

    border:1px solid blue;

    display:inline;

    float:left;

    line-height:1.5em;

    margin:15px;

    padding:5px;

    width:200px;

    height:150px;

    min-height: 500px;

    }

    #content {

    border:1px solid blue;

    display:inline;

    float:left;

    font-size:100%;

    line-height:1.5em;

    margin:15px;

    padding:5px;

    text-align:left;

    width:480px;

    min-height: 500px;

    }

    #footer {

    border:1px solid blue;

    background-position:50% 100%;

    background-repeat:repeat no-repeat;

    clear:both;

    height:30px;

    margin:15px;

    padding: 10px;

    text-align:center;

    width:780px;

    }

    程序12.22

    "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"

    "/dtds/tiles-config_2_">

    程序12.23

    package ;

    import Support;

    import ;

    public class LoginAction extends ActionSupport{

    private User user;

    public String authenticate() { // 登录验证方法

    if (rname().equals("admin")

    && sword().equals("admin123")){

    return "success";

    } else {

    addActionError(getText(""));

    return "error";

    }

    }

    public String logout() { // 退出登录方法

    return "logout";

    }

    public User getUser() {

    return user;

    }

    public void setUser(User user) {

    = user;

    }

    }

    程序12.24

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

    "/dtds/">

    value="false" />

    value="ApplicationResources" />

    class="esult" />

    method="authenticate">

    /

    /

    method="logout" >

    /

    本文标签： 对象请求页面客户登录

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