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本文主要讲ssm框架整合EhCache。或许有人会问什么是ehcache。
关于EhCache的介绍和优劣,我想下面的解答足以让读者明白:
EhCache 是一个纯Java的进程内缓存框架,具有快速、精干等特点,是Hibernate中默认的CacheProvider。Ehcache是一种广泛使用的开 源Java分布式缓存。主要面向通用缓存,Java EE和轻量级容器。它具有内存和磁盘存储,缓存加载器,缓存扩展,缓存异常处理程序,一个gzip缓存servlet过滤器,支持REST和SOAP api等特点。
优点:
1. 快速
2. 简单
3. 多种缓存策略
4. 缓存数据有两级:内存和磁盘,因此无需担心容量问题
5. 缓存数据会在虚拟机重启的过程中写入磁盘
6. 可以通过RMI、可插入API等方式进行分布式缓存
7. 具有缓存和缓存管理器的侦听接口
8. 支持多缓存管理器实例,以及一个实例的多个缓存区域
9. 提供Hibernate的缓存实现
缺点:
1. 使用磁盘Cache的时候非常占用磁盘空间:这是因为DiskCache的算法简单,该算法简单也导致Cache的效率非常高。它只是对元素直接追加存储。因此搜索元素的时候非常的快。如果使用DiskCache的,在很频繁的应用中,很快磁盘会满。
2. 不能保证数据的安全:当突然kill掉java的时候,可能会产生冲突,EhCache的解决方法是如果文件冲突了,则重建cache。这对于Cache 数据需要保存的时候可能不利。当然,Cache只是简单的加速,而不能保证数据的安全。如果想保证数据的存储安全,可以使用Bekeley DB Java Edition版本。这是个嵌入式数据库。可以确保存储安全和空间的利用率。
或许还有人很疑惑缓存,什么是缓存?为什么需要缓存?
引用百度百科的回答:
缓存就是数据交换的缓冲区(称作Cache),当某一硬件要读取数据时,会首先从缓存中查找需要的数据,如果找到了则直接执行,找不到的话则从内存中找。由于缓存的运行速度比内存快得多,故缓存的作用就是帮助硬件更快地运行。
因为缓存往往使用的是RAM(断电即掉的非永久储存),所以在用完后还是会把文件送到硬盘等存储器里永久存储。电脑里最大的缓存就是内存条了,最快的是CPU上镶的L1和L2缓存,显卡的显存是给显卡运算芯片用的缓存,硬盘上也有16M或者32M的缓存。
或许还有人会问内存是什么?
引用百度百科的回答:
内存是计算机中重要的部件之一,它是与CPU进行沟通的桥梁。计算机中所有程序的运行都是在内存中进行的,因此内存的性能对计算机的影响非常大。内存(Memory)也被称为内存储器,其作用是用于暂时存放CPU中的运算数据,以及与硬盘等外部存储器交换的数据。只要计算机在运行中,CPU就会把需要运算的数据调到内存中进行运算,当运算完成后CPU再将结果传送出来,内存的运行也决定了计算机的稳定运行。 内存是由内存芯片、电路板、金手指等部分组成的。
也许还人会骂我,说你怎么尽引用百度百科。
我的回答是,因为我对此也不知道怎么回答。
如果让我回答在开发中为什么需要缓存及其缓存的作用,我的回答是,对于有些数据,我只需查询一遍就可以,不需要再度查询,因为有缓存。就好比数据库优化,除了索引之外,还有就是将数据库里面的数据缓存起来,这样对于大规模数据,平常需要多次查询,导致耗费时间很长,性能差,但是我通过缓存,只需查询一次,当再次查询时,就非常快,对整个系统的响应和性能也不会有什么影响。当然了,当涉及到缓存的数据与实际数据库中的数据存在差异时,这里后续会讲采取怎样的方式解决这个问题。
另外建议软件开发的朋友们,有空多多去熟悉熟悉计算机相关的理论知识。正所谓有句话叫做:万变不离其宗。这个其宗在计算机中可以理解为算法与数据结构、操作系统、TCP/IP、计算机基础知识、编译原理等等。把握好这些,编程之路才能越走越长。
这也是一位朋友对我说的。
下面进入正题,关于SSM框架整合EhCache
sql脚本准备
CREATE TABLE `user` (
`user_id` int(8) NOT NULL AUTO_INCREMENT COMMENT '用户主键',
`login_code` varchar(20) NOT NULL COMMENT '用户编码(登录账户) 手机号 邮箱号',
`user_name` varchar(20) NOT NULL COMMENT '用户名',
`password` varchar(40) NOT NULL COMMENT '密码',
`sex` int(2) NOT NULL COMMENT '性别',
`identity_card` varchar(20) DEFAULT NULL COMMENT '身份证',
`create_time` datetime NOT NULL COMMENT '创建时间',
`create_by` varchar(10) NOT NULL COMMENT '创建人',
`update_time` datetime NOT NULL COMMENT '更新时间',
`update_by` varchar(10) NOT NULL COMMENT '更新人',
`status` int(2) NOT NULL DEFAULT '0' COMMENT '状态:0注册新用户 1邮件认证用户 2管理员 3黑名单',
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
一、导入Maven依赖
<project xmlns="http://maven.apache/POM/4.0.0" xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache/POM/4.0.0 http://maven.apache/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.blog</groupId>
<artifactId>Blog</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<!-- 文件拷贝时的编码 -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<!-- 编译时的编码 -->
<mavenpiler.encoding>UTF-8</mavenpiler.encoding>
<spring.version>4.3.13.RELEASE</spring.version>
<junit.version>4.12</junit.version>
<druid.version>1.1.0</druid.version>
<fastjson.version>1.2.8</fastjson.version>
<mybaitsplus.version>2.1.8</mybaitsplus.version>
<mysql.version>5.1.38</mysql.version>
<log4j.version>1.2.17</log4j.version>
<slf4j.version>1.7.19</slf4j.version>
<aspectjweaver.version>1.8.8</aspectjweaver.version>
<fileupload.version>1.3.1</fileupload.version>
<jstl.version>1.2</jstl.version>
<commons-io.version>2.5</commons-io.version>
<commons-fileupload.version>1.3.1</commons-fileupload.version>
<ruedigermoeller-fst.version>2.56</ruedigermoeller-fst.version>
<json.version>20170516</json.version>
<dozer.version>5.5.1</dozer.version>
<poi.version>3.14</poi.version>
</properties>
<dependencies>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.46</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.0</version>
</dependency>
<!-- kisso end -->
<!-- JUnit -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<!-- jsp -->
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>compile</scope>
</dependency>
<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>compile</scope>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<!-- Spring MVC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<!-- AOP -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>${aspectjweaver.version}</version>
</dependency>
<!-- FileUpload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>${fileupload.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>${jstl.version}</version>
</dependency>
<!-- Mybatis-Plus -->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>${mybaitsplus.version}</version>
</dependency>
<!-- Mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<!-- Druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
<!-- FastJson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<!-- Log -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.apachemons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>de.ruedigermoeller</groupId>
<artifactId>fst</artifactId>
<version>${ruedigermoeller-fst.version}</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.3</version>
</dependency>
<!-- Json in java -->
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20170516</version>
</dependency>
<!-- Email -->
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.5.2</version>
<scope>provided</scope>
</dependency>
<!-- <dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency> -->
<!-- 条形码、二维码生成 -->
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
<!-- User Agent -->
<dependency>
<groupId>eu.bitwalker</groupId>
<artifactId>UserAgentUtils</artifactId>
<version>1.20</version>
</dependency>
<!-- Apache HTTP -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
<!-- Jsoup HTTP -->
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.9.1</version>
</dependency>
<!-- 图片Meta获取 -->
<dependency>
<groupId>com.drewnoakes</groupId>
<artifactId>metadata-extractor</artifactId>
<version>2.9.1</version>
</dependency>
<!-- 缩略图工具 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
<!-- 图片验证码生成 -->
<dependency>
<groupId>com.bladejava</groupId>
<artifactId>blade-patchca</artifactId>
<version>1.0.5</version>
</dependency>
<!-- jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.5</version>
</dependency>
<!-- https://mvnrepository/artifact/com.fasterxml.jackson.dataformat/jackson-dataformat-xml -->
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
<version>2.9.5</version>
</dependency>
<!-- Java xml -->
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<!-- XPath xml -->
<dependency>
<groupId>jaxen</groupId>
<artifactId>jaxen</artifactId>
<version>1.1.6</version>
</dependency>
<!-- Snake YAML -->
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>1.17</version>
</dependency>
<!-- Bean To Bean copy -->
<dependency>
<groupId>net.sf.dozer</groupId>
<artifactId>dozer</artifactId>
<version>${dozer.version}</version>
</dependency>
<!-- POI Office Tools -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
<exclusions>
<exclusion>
<artifactId>commons-codec</artifactId>
<groupId>commons-codec</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>${poi.version}</version>
</dependency>
<!-- pinyin4j -->
<dependency>
<groupId>com.belerweb</groupId>
<artifactId>pinyin4j</artifactId>
<version>2.5.0</version>
</dependency>
<!-- Apache Tools Ant Tar Zip -->
<dependency>
<groupId>org.apache.ant</groupId>
<artifactId>ant</artifactId>
<version>1.9.7</version>
</dependency>
<!-- File MimeType ContentType -->
<dependency>
<groupId>net.sf.jmimemagic</groupId>
<artifactId>jmimemagic</artifactId>
<version>0.1.3</version>
<exclusions>
<exclusion>
<groupId>xerces</groupId>
<artifactId>xercesImpl</artifactId>
</exclusion>
<exclusion>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-xc</artifactId>
</exclusion>
<exclusion>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-jaxrs</artifactId>
</exclusion>
<exclusion>
<artifactId>log4j</artifactId>
<groupId>log4j</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- swagger -->
<dependency>
<groupId>com.mangofactory</groupId>
<artifactId>swagger-springmvc</artifactId>
<version>1.0.2</version>
</dependency>
<!-- hutool -->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>4.1.0</version>
</dependency>
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.10.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- 指定编译版本 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
<finalName>${project.artifactId}</finalName>
</build>
<repositories>
<repository>
<id>aliyun-repos</id>
<name>Aliyun Repository</name>
<url>http://maven.aliyun/nexus/content/groups/public</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>false</enabled></snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>aliyun-repos</id>
<name>Aliyun Repository</name>
<url>http://maven.aliyun/nexus/content/groups/public</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>false</enabled></snapshots>
</pluginRepository>
</pluginRepositories>
</project>
二、编写实体
package com.blog.entity;
import java.io.Serializable;
import com.baomidou.mybatisplus.enums.IdType;
import java.util.Date;
import com.baomidou.mybatisplus.annotations.TableId;
import com.baomidou.mybatisplus.annotations.TableName;
import com.baomidou.mybatisplus.annotations.TableField;
import com.baomidou.mybatisplus.activerecord.Model;
import java.io.Serializable;
/**
* <p>
*
* </p>
*
* @author youcong123
* @since 2018-07-22
*/
@TableName("user")
public class User extends Model<User> {
private static final long serialVersionUID = 1L;
/**
* 用户主键
*/
@TableId(value = "user_id", type = IdType.AUTO)
private Integer userId;
/**
* 用户编码(登录账户) 手机号 邮箱号
*/
@TableField("login_code")
private String loginCode;
/**
* 用户名
*/
@TableField("user_name")
private String userName;
/**
* 密码
*/
private String password;
/**
* 性别
*/
private Integer sex;
/**
* 身份证
*/
@TableField("identity_card")
private String identityCard;
/**
* 创建时间
*/
@TableField("create_time")
private Date createTime;
/**
* 创建人
*/
@TableField("create_by")
private String createBy;
/**
* 更新时间
*/
@TableField("update_time")
private Date updateTime;
/**
* 更新人
*/
@TableField("update_by")
private String updateBy;
/**
* 状态:0注册新用户 1邮件认证用户 2管理员 3黑名单
*/
private Integer status;
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public String getLoginCode() {
return loginCode;
}
public void setLoginCode(String loginCode) {
this.loginCode = loginCode;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getSex() {
return sex;
}
public void setSex(Integer sex) {
this.sex = sex;
}
public String getIdentityCard() {
return identityCard;
}
public void setIdentityCard(String identityCard) {
this.identityCard = identityCard;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public String getCreateBy() {
return createBy;
}
public void setCreateBy(String createBy) {
this.createBy = createBy;
}
public Date getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}
public String getUpdateBy() {
return updateBy;
}
public void setUpdateBy(String updateBy) {
this.updateBy = updateBy;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
@Override
protected Serializable pkVal() {
return this.userId;
}
@Override
public String toString() {
return "User{" +
"userId=" + userId +
", loginCode=" + loginCode +
", userName=" + userName +
", password=" + password +
", sex=" + sex +
", identityCard=" + identityCard +
", createTime=" + createTime +
", createBy=" + createBy +
", updateTime=" + updateTime +
", updateBy=" + updateBy +
", status=" + status +
"}";
}
}
三、编写DAO
package com.blog.mapper;
import com.blog.entity.User;
import com.baomidou.mybatisplus.mapper.BaseMapper;
/**
* <p>
* Mapper 接口
* </p>
*
* @author youcong123
* @since 2018-07-22
*/
public interface UserDao extends BaseMapper<User> {
}
四、编写业务接口类
package com.blog.service;
import com.blog.entity.User;
import com.baomidou.mybatisplus.service.IService;
/**
* <p>
* 服务类
* </p>
*
* @author youcong123
* @since 2018-07-22
*/
public interface UserService extends IService<User> {
User getUserById(String userId);
User login(String loginCode);
}
五、编写业务接口实现类
package com.blog.service.impl;
import com.blog.entity.User;
import com.blog.mapper.UserDao;
import com.blog.service.UserService;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONObject;
import com.baomidou.mybatisplus.mapper.EntityWrapper;
import com.baomidou.mybatisplus.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;
/**
* <p>
* 服务实现类
* </p>
*
* @author youcong123
* @since 2018-07-22
*/
@Service
public class UserServiceImpl extends ServiceImpl<UserDao, User> implements UserService {
@Autowired
private UserDao userDao;
@Override
@Cacheable(value="cacheTest")
public User getUserById(String userId) {
return userDao.selectById(userId);
}
@Override
public User login(String loginCode) {
User user = new User();
user.setLoginCode(loginCode);
return userDao.selectOne(user);
}
}
六、编写Controller
package com.blog.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.blog.entity.User;
import com.blog.service.UserService;
import cn.hutool.json.JSONObject;
/**
* <p>
* 前端控制器
* </p>
*
* @author youcong123
* @since 2018-07-22
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping(value="getById",produces="application/json;charset=utf-8")
public Object getById(String userId) {
JSONObject json = new JSONObject();
User user = userService.getUserById(userId);
json.put("user", user);
return user;
}
}
七、编写DAO对应的XML
UserDao.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis//DTD Mapper 3.0//EN" "http://mybatis/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.blog.mapper.UserDao">
<!-- 通用查询映射结果 -->
<resultMap id="BaseResultMap" type="com.blog.entity.User">
<id column="user_id" property="userId" />
<result column="login_code" property="loginCode" />
<result column="user_name" property="userName" />
<result column="password" property="password" />
<result column="sex" property="sex" />
<result column="identity_card" property="identityCard" />
<result column="create_time" property="createTime" />
<result column="create_by" property="createBy" />
<result column="update_time" property="updateTime" />
<result column="update_by" property="updateBy" />
<result column="status" property="status" />
</resultMap>
<!-- 通用查询结果列 -->
<sql id="Base_Column_List">
user_id AS userId, login_code AS loginCode, user_name AS userName, password, sex, identity_card AS identityCard, create_time AS createTime, create_by AS createBy, update_time AS updateTime, update_by AS updateBy, status
</sql>
</mapper>
八、编写配置文件
spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework/schema/beans"
xmlns:xsi="http://www.w3/2001/XMLSchema-instance"
xmlns:context="http://www.springframework/schema/context" xmlns:util="http://www.springframework/schema/util"
xsi:schemaLocation="http://www.springframework/schema/beans http://www.springframework/schema/beans/spring-beans.xsd http://www.springframework/schema/context http://www.springframework/schema/context/spring-context.xsd http://www.springframework/schema/util http://www.springframework/schema/util/spring-util.xsd">
<!-- 引入属性文件 -->
<context:property-placeholder location="classpath:config.properties"/>
<!-- Service包(自动注入) -->
<context:component-scan base-package="com.blog.service"/>
<import resource="classpath:spring/spring-mybatis.xml"/>
</beans>
spring-mybatis.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework/schema/beans"
xmlns:context="http://www.springframework/schema/context"
xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xmlns:aop="http://www.springframework/schema/aop"
xmlns:tx="http://www.springframework/schema/tx" xmlns:p="http://www.springframework/schema/p"
xmlns:util="http://www.springframework/schema/util" xmlns:jdbc="http://www.springframework/schema/jdbc"
xmlns:cache="http://www.springframework/schema/cache"
xsi:schemaLocation="
http://www.springframework/schema/context
http://www.springframework/schema/context/spring-context.xsd
http://www.springframework/schema/beans
http://www.springframework/schema/beans/spring-beans.xsd
http://www.springframework/schema/tx
http://www.springframework/schema/tx/spring-tx.xsd
http://www.springframework/schema/jdbc
http://www.springframework/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework/schema/cache
http://www.springframework/schema/cache/spring-cache-3.1.xsd
http://www.springframework/schema/aop
http://www.springframework/schema/aop/spring-aop.xsd
http://www.springframework/schema/util
http://www.springframework/schema/util/spring-util.xsd">
<!-- 应用spring-cache注解功能 -->
<cache:annotation-driven cache-manager="cacheManager" />
<!-- 配置数据源 -->
<bean name="defaultDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<property name="url" value="${jdbc_url}"/>
<property name="username" value="${jdbc_username}"/>
<property name="password" value="${jdbc_password}"/>
<!-- 初始化连接大小 -->
<property name="initialSize" value="0"/>
<!-- 连接池最大使用连接数量 -->
<property name="maxActive" value="20"/>
<!-- 连接池最大空闲 -->
<property name="maxIdle" value="20"/>
<!-- 连接池最小空闲 -->
<property name="minIdle" value="0"/>
<!-- 获取连接最大等待时间 -->
<property name="maxWait" value="60000"/>
<property name="validationQuery" value="${validationQuery}"/>
<property name="testOnBorrow" value="false"/>
<property name="testOnReturn" value="false"/>
<property name="testWhileIdle" value="true"/>
<!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="60000"/>
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="25200000"/>
<!-- 打开removeAbandoned功能 -->
<property name="removeAbandoned" value="true"/>
<!-- 1800秒,也就是30分钟 -->
<property name="removeAbandonedTimeout" value="1800"/>
<!-- 关闭abanded连接时输出错误日志 -->
<property name="logAbandoned" value="true"/>
<!-- 监控数据库 -->
<property name="filters" value="mergeStat"/>
</bean>
<bean id="druidDynamicDataSource" class="com.blog.datasource.DruidDynamicDataSource">
<property name="defaultTargetDataSource" ref="defaultDataSource" />
<property name="targetDataSources">
<map>
<entry key="defaultDataSource" value-ref="defaultDataSource"/>
<!-- 这里还可以加多个dataSource -->
</map>
</property>
</bean>
<!-- Spring整合Mybatis,更多查看文档:http://mp.baomidou -->
<bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.spring.MybatisSqlSessionFactoryBean">
<property name="dataSource" ref="druidDynamicDataSource" />
<!-- 自动扫描Mapping.xml文件 -->
<property name="mapperLocations" value="classpath:mybatis/system/*.xml"/>
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
<property name="typeAliasesPackage" value="com.blog.entity"/>
<property name="plugins">
<array>
<!-- 分页插件配置 -->
<bean id="paginationInterceptor" class="com.baomidou.mybatisplus.plugins.PaginationInterceptor">
</bean>
</array>
</property>
<!-- 全局配置注入 -->
<property name="globalConfig" ref="globalConfig" />
</bean>
<bean id="globalConfig" class="com.baomidou.mybatisplus.entity.GlobalConfiguration">
<!--
AUTO->`0`("数据库ID自增")
INPUT->`1`(用户输入ID")
ID_WORKER->`2`("全局唯一ID")
UUID->`3`("全局唯一ID")
-->
<property name="idType" value="2" />
<!--
MYSQL->`mysql`
ORACLE->`oracle`
DB2->`db2`
H2->`h2`
HSQL->`hsql`
SQLITE->`sqlite`
POSTGRE->`postgresql`
SQLSERVER2005->`sqlserver2005`
SQLSERVER->`sqlserver`
-->
<!-- Oracle需要添加该项 -->
<!-- <property name="dbType" value="oracle" /> -->
<!-- 全局表为下划线命名设置 true -->
<!-- <property name="dbColumnUnderline" value="true" /> -->
<!-- <property name="metaObjectHandler">
<bean class="com.lmsmon.MyMetaObjectHandler" />
</property> -->
</bean>
<!-- MyBatis 动态扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.blog.mapper"/>
</bean>
<!-- 配置事务管理 -->
<bean name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="druidDynamicDataSource"/>
</bean>
<!-- 事务管理 属性 -->
<tx:advice id="transactionAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED"/>
<tx:method name="append*" propagation="REQUIRED"/>
<tx:method name="save*" propagation="REQUIRED"/>
<tx:method name="update*" propagation="REQUIRED"/>
<tx:method name="modify*" propagation="REQUIRED"/>
<tx:method name="edit*" propagation="REQUIRED"/>
<tx:method name="insert*" propagation="REQUIRED"/>
<tx:method name="delete*" propagation="REQUIRED"/>
<tx:method name="remove*" propagation="REQUIRED"/>
<tx:method name="repair" propagation="REQUIRED"/>
<tx:method name="get*" propagation="REQUIRED" read-only="true"/>
<tx:method name="find*" propagation="REQUIRED" read-only="true"/>
<tx:method name="load*" propagation="REQUIRED" read-only="true"/>
<tx:method name="search*" propagation="REQUIRED" read-only="true"/>
<tx:method name="datagrid*" propagation="REQUIRED" read-only="true"/>
<tx:method name="*" propagation="REQUIRED" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 配置切面 -->
<aop:config>
<aop:pointcut id="transactionPointcut" expression="execution(* com.blog.service..*.*(..))"/>
<aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice"/>
</aop:config>
<!-- 配置ehcache管理器-->
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
<property name="cacheManager" ref="ehcache"></property>
</bean>
<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:ehcache-setting.xml"></property>
</bean>
</beans>
spring-mvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework/schema/beans"
xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xmlns:context="http://www.springframework/schema/context"
xmlns:mvc="http://www.springframework/schema/mvc"
xsi:schemaLocation="http://www.springframework/schema/beans http://www.springframework/schema/beans/spring-beans.xsd http://www.springframework/schema/context http://www.springframework/schema/context/spring-context.xsd http://www.springframework/schema/mvc http://www.springframework/schema/mvc/spring-mvc.xsd">
<!-- Controller包(自动注入) -->
<context:component-scan base-package="com.blog.controller"/>
<mvc:default-servlet-handler/>
<!-- FastJson注入 -->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean id="fastJsonHttpMessageConverter"
class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 上传限制 -->
<bean id="multipartResolver" class="org.springframework.web.multipartmons.CommonsMultipartResolver">
<!-- 上传文件大小限制为31M,31*1024*1024 -->
<property name="maxUploadSize" value="32505856"/>
</bean>
</beans>
config.properties
validationQuery=SELECT 1
jdbc_url=jdbc:mysql://localhost:3306/blog_test?useUnicode=true&characterEncoding=UTF-8
jdbc_username=root
jdbc_password=1234
ehcache-setting.xml
<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
<!-- 指定一个文件目录,当EhCache把数据写到硬盘上时,将把数据写到这个文件目录下 -->
<!-- <diskStore path="D://cache//java-cache"/> -->
<diskStore path="java.io.tmpdir"/>
<!-- 设定缓存的默认数据过期策略 -->
<defaultCache
maxElementsInMemory="10000"
eternal="false"
overflowToDisk="true"
timeToIdleSeconds="10"
timeToLiveSeconds="20"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"/>
<cache name="cacheTest"
maxElementsInMemory="1000"
eternal="false"
overflowToDisk="true"
timeToIdleSeconds="100"
timeToLiveSeconds="200"/>
</ehcache>
关于diskstore配置说明:
1、diskStore元素是可选的,非必须的。如果不使用磁盘存储,只需要将diskStore注释掉即可;如果使用,需要在ehcache.xml文件中的ehcahce元素下的定义一个diskStore元素并指定其path属性。
2、由diskStore元素是定义在ehcache元素下我们看出diskStore在CacheManager范围内是共享的,其是线程安全的
3、对于任何缓存,如果你已经激活了overflowToDisk或diskPersistent,就要配置磁盘存储器。
(关于overflowToDisk或diskPersistent的配置,详见配置文件ehcache.xml详解(1) )
4、DiskStore中驱除元素跟MemoryStore中驱除元素的规则是不一样的。当往DiskStore中添加元素且此时DiskStore中的容量已经超出限制时将采用LFU(最不常用)驱除规则将对应的元素进行删除,而且该驱除规则是不可配置的(通过cache中的diskExpiryThreadIntervalSeconds属性完成)
5、path属性如果是下述Java系统属性之一,他将会被运行中的VM中的值替换。为了向后兼容,这些应该被特别规定,而不会被${token}替换语法封闭。
6、path属性可以配置的目录有:
user.home(用户的家目录)
user.dir(用户当前的工作目录)
java.io.tmpdir(默认的临时目录)
ehcache.disk.store.dir(ehcache的配置目录)
绝对路径(如:d://javastore)
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis//DTD SQL Map Config 3.0//EN"
"http://mybatis/dtd/mybatis-3-config.dtd">
<!--
| plugins在配置文件中的位置必须符合要求,否则会报错,顺序如下:
| properties?, settings?,
| typeAliases?, typeHandlers?,
| objectFactory?,objectWrapperFactory?,
| plugins?,
| environments?, databaseIdProvider?, mappers?
|-->
<configuration>
<!--
| 全局配置设置
|
| 可配置选项 默认值, 描述
|
| aggressiveLazyLoading true, 当设置为‘true’的时候,懒加载的对象可能被任何懒属性全部加载。否则,每个属性都按需加载。
| multipleResultSetsEnabled true, 允许和不允许单条语句返回多个数据集(取决于驱动需求)
| useColumnLabel true, 使用列标签代替列名称。不同的驱动器有不同的作法。参考一下驱动器文档,或者用这两个不同的选项进行测试一下。
| useGeneratedKeys false, 允许JDBC 生成主键。需要驱动器支持。如果设为了true,这个设置将强制使用被生成的主键,有一些驱动器不兼容不过仍然可以执行。
| autoMappingBehavior PARTIAL, 指定MyBatis 是否并且如何来自动映射数据表字段与对象的属性。PARTIAL将只自动映射简单的,没有嵌套的结果。FULL 将自动映射所有复杂的结果。
| defaultExecutorType SIMPLE, 配置和设定执行器,SIMPLE 执行器执行其它语句。REUSE 执行器可能重复使用prepared statements 语句,BATCH执行器可以重复执行语句和批量更新。
| defaultStatementTimeout null, 设置一个时限,以决定让驱动器等待数据库回应的多长时间为超时
| -->
<settings>
<!-- 这个配置使全局的映射器启用或禁用缓存 -->
<setting name="cacheEnabled" value="true"/>
<!-- 全局启用或禁用延迟加载。当禁用时,所有关联对象都会即时加载 -->
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="multipleResultSetsEnabled" value="true"/>
<setting name="useColumnLabel" value="true"/>
<setting name="defaultExecutorType" value="REUSE"/>
<setting name="defaultStatementTimeout" value="25000"/>
</settings>
<plugins>
<!-- SQL 执行分析拦截器 stopProceed 发现全表执行 delete update 是否停止运行 -->
<plugin interceptor="com.baomidou.mybatisplus.plugins.SqlExplainInterceptor">
<property name="stopProceed" value="false" />
</plugin>
<!-- SQL 执行性能分析,开发环境使用,线上不推荐。 maxTime 指的是 sql 最大执行时长 -->
<plugin interceptor="com.baomidou.mybatisplus.plugins.PerformanceInterceptor">
<property name="maxTime" value="100" />
<!--SQL是否格式化 默认false-->
<property name="format" value="true" />
</plugin>
</plugins>
</configuration>
log4j.properties
#config root logger
log4j.rootLogger = INFO,system.out
log4j.appender.system.out=org.apache.log4j.ConsoleAppender
log4j.appender.system.out.layout=org.apache.log4j.PatternLayout
log4j.appender.system.out.layout.ConversionPattern=[Log]%-d{yyyy-MM-dd HH:mm:ss} %5p[%F:%L]:%m%n
#log4j.appender.system.out.layout.ConversionPattern=[Log] %5p[%F:%L]:%m%n
#config this Project.file logger
log4j.logger.thisProject.file=INFO,thisProject.file.out
log4j.appender.thisProject.file.out=org.apache.log4j.DailyRollingFileAppender
log4j.appender.thisProject.file.out.File=pmslogout.log
log4j.appender.thisProject.file.out.layout=org.apache.log4j.PatternLayout
log4j.appender.thisProject.file.out.layout.ConversionPattern=[Log]%-d{yyyy-MM-dd HH:mm:ss} %5p[%F:%L]:%m%n
log4j.appender.thisProject.file.append=true
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3/2001/XMLSchema-instance" xmlns="http://java.sun/xml/ns/javaee" xsi:schemaLocation="http://java.sun/xml/ns/javaee http://java.sun/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>Blog</display-name>
<!-- 欢迎页 -->
<welcome-file-list>
<welcome-file>views/login.html</welcome-file>
</welcome-file-list>
<!-- 加载配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring.xml</param-value>
</context-param>
<!-- 字符过滤器 拦截所有 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 上下文监听 -->
<listener>
<description>Spring监听器</description>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 前端控制器 拦截 -->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<description>SpringMVC</description>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- session过期时间 -->
<session-config>
<session-timeout>30</session-timeout>
</session-config>
</web-app>
九、运行项目,如果控制台五报错,就通过PostMan接口测试
PostMan可运行多次 发现控制台始终都只打印一次就表示缓存成功
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