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JSP实现登录与注册界面
1、首页index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>index</title>
</head>
<body>
<%
//接收是否登录成功数据
String flag=request.getParameter("flag");
if(flag==null){
flag="";
}
if(flag.equals("sucessful")){
String okname=(String)request.getAttribute("okname");
%>
<%=okname %>你好!/<a href="index.jsp">注销</a>
<%
}else{
%>
<a href="login.jsp">登录</a>/
<a href="reg.jsp">注册</a>
<%
}
%>
</body>
</html>
2、注册界面reg.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>注册页面</title>
</head>
<body>
<form action="showReg.jsp" method="post">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td>确认密码:</td>
<td><input type="password" name="okPassword"/></td>
</tr>
<tr>
<td>性别:</td>
<td>
<input type="radio" name="sex" value="男"/>男
<input type="radio" name="sex" value="女"/>女
</td>
</tr>
<tr>
<td>兴趣:</td>
<td>
<input type="checkbox" name="interest" value="爬山"/>爬山
<input type="checkbox" name="interest" value="钓鱼"/>钓鱼
</td>
</tr>
<tr>
<td><input type="submit" value="注册"/></td>
<td><input type="reset" value="重置"/></td>
</tr>
</table>
<%
String strMess=request.getParameter("mess");
if(strMess==null){
strMess="";
}
%>
<%=strMess %>
<br>
<br>
<br>
<br>
</form>
</body>
</html>
3、注册成功,显示注册信息,showReg.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>展示注册信息</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
//接受数据
String name=request.getParameter("username");
String pwd=request.getParameter("password");
String okPwd=request.getParameter("okPassword");
String sex=request.getParameter("sex");
String[] interest=request.getParameterValues("interest");
//验证数据
if(name==null||name.equals("")||pwd==null||pwd.equals("")||okPwd==null||okPwd.equals("")||sex==null||sex.equals("")||interest==null||interest.equals("")){
%>
<jsp:forward page="reg.jsp">
<jsp:param value="页面上的内容不能为空!" name="mess"/>
</jsp:forward>
<%
}
else if(!pwd.equals(okPwd)){
%>
<jsp:forward page="reg.jsp">
<jsp:param value="两次输入的密码不一致!请重新输入" name="mess"/>
</jsp:forward>
<%
}
//处理数据
//将String[]->String
String strHobby="";
for(int i=0;i<interest.length;i++){
strHobby+=interest[i]+",";
}
//去掉末尾的,
if(!strHobby.equals("")){
strHobby=strHobby.substring(0, strHobby.length()-1);
}
//在数据库添加数据
//在页面显示数据
%>
恭喜您注册成功!以下为您的注册信息:
<br>
用户名:<%=name %>
<br>
密码:<%=pwd %>
<br>
性别:<%=sex %>
<br>
兴趣:<%=strHobby%>
</body>
</html>
4、登录界面login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>login</title>
</head>
<body>
<form action="loginProcess.jsp" method="post">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="text" name="password"/></td>
</tr>
<tr>
<td><input type="submit" value="确定" /></td>
<td><input type="submit" value="重置" /></td>
</tr>
</table>
<%
String strMess=request.getParameter("mess");
if(strMess==null){
strMess="";
}
%>
<%=strMess %>
</form>
</body>
</html>
5、登录判断,loginProcess.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>loginProcess</title>
</head>
<body>
<form action="index.jsp">
<%!
String flag="fail";
%>
<%
request.setCharacterEncoding("utf-8");
//接收数据
String name=request.getParameter("username");
String pwd=request.getParameter("password");
//验证数据
if(name==null||name.equals("")||pwd==null||pwd.equals("")){
%>
<jsp:forward page="login.jsp">
<jsp:param value="用户名或密码不能为空!" name="mess"/>
</jsp:forward>
<%
}else if(name.length()>15){
%>
<jsp:forward page="login.jsp">
<jsp:param value="用户名长度不能超过15" name="mess"/>
</jsp:forward>
<%
}else{
flag="sucessful";
request.setAttribute("okname", name);
%>
<jsp:forward page="index.jsp">
<jsp:param name="flag" value="sucessful"/>
</jsp:forward>
<%
}
//处理数据
%>
</form>
</body>
</html>
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