SpringBoot 缓存之redis 篇
项目目录结构
依赖包引入
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.cwh</groupId>
<artifactId>springbootCache</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springbootCache</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.10.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>配置文件
spring.datasource.url=jdbc\:mysql\://127.0.0.1\:3306/springboots?useUnicode\=true&characterEncoding\=gbk&zeroDateTimeBehavior\=convertToNull
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# \u521D\u59CB\u5316\u5927\u5C0F\uFF0C\u6700\u5C0F\uFF0C\u6700\u5927
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# \u914D\u7F6E\u83B7\u53D6\u8FDE\u63A5\u7B49\u5F85\u8D85\u65F6\u7684\u65F6\u95F4
spring.datasource.maxWait=60000
spring.datasource.show-sql=true
mybatis.mapper-locations=classpath*:mapper/*Mapper.xml
mybatis.type-aliases-package=com.cwh.springbootMybatis.entity
spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=
spring.redis.database=1
spring.redis.pool.max-active=20
spring.redis.pool.max-wait=-1
spring.redis.pool.max-idle=500
spring.redis.pool.min-idle=5
spring.redis.timeout=0
logging.level.com.cwh.springbootCache=DEBUG具体代码
UserMapper.xml：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.cwh.springbootCache.mapper.UserMapper">
<select id="findUserInfo" resultType="com.cwh.springbootCache.entity.User" parameterType="java.lang.Integer">
select id,name from user where id=#{id}
</select>
<insert id="addUserInfo" parameterType="com.cwh.springbootCache.entity.User">
insert into user (id, name
)
values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}
)
</insert>
<insert id="updateUserInfo" parameterType="com.cwh.springbootCache.entity.User">
update user set name=#{name} where id=#{id}
</insert>
<delete id="delUserInfo" parameterType="java.lang.Integer">
delete from user where id = #{id,jdbcType=INTEGER}
</delete>
</mapper>UserMapper.java：
package com.cwh.springbootCache.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import com.cwh.springbootCache.entity.User;
@CacheConfig(cacheNames = "user")//缓存名
@Mapper
public interface UserMapper {
/**
* #p0代表第一个参数，也就是id,
* 先从redis的user缓存对象里去查询key等于传过来的id的值。如果没有，就去查表
* @param id
* @return
*/
@Cacheable(key = "#p0")
public List<User> findUserInfo(int id);
/**
* 代表往缓存里添加值，key为参数user的id属性，
* 这样当我们add一个User对象时，redis就会新增一个以id为key的User对象
* @param user
* @return
*/
@CachePut(key = "#p0.id")
public int addUserInfo(User user);
/**
* 代表往缓存里修改值，key为参数user的id属性，
* 这样当我们update一个User对象时，redis就会修改一个以id为key的User对象，
* 如果id为key的User对象没有，redis则新增一个以id为key的User对象
* @param user
* @return
*/
@CachePut(key = "#p0.id")
public int updateUserInfo(User user);
/**
* 删除缓存
* @param id
* @return
*/
@CacheEvict(key = "#p0")
public int delUserInfo(int id);
}
说明：代码注释里以及写明用法，这里就不再赘述了UserService.java:
package com.cwh.springbootCache.service;
import java.util.List;
import com.cwh.springbootCache.entity.User;
public interface UserService {
public List<User> getUserInfo(int id);
public void insert(User user);
public void update(User user);
public void delete(int id);
}UserServiceImpl.java:
package com.cwh.springbootCache.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.cwh.springbootCache.entity.User;
import com.cwh.springbootCache.mapper.UserMapper;
import com.cwh.springbootCache.service.UserService;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;
public void insert(User user) {
userMapper.addUserInfo(user);
}
@Override
public List<User> getUserInfo(int id) {
return userMapper.findUserInfo(id);
}
@Override
public void update(User user) {
userMapper.updateUserInfo(user);
}
@Override
public void delete(int id) {
userMapper.delUserInfo(id);
}
}UserController.java:
package com.cwh.springbootCache.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.cwh.springbootCache.entity.User;
import com.cwh.springbootCache.service.UserService;
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/getUserInfo/{id}")
public List<User> getUserInfo(@PathVariable("id")String id) {
List<User> user = userService.getUserInfo(Integer.valueOf(id));
System.out.println(user.toString());
return user;
}
@RequestMapping("/addUserInfo")
public String addUserInfo() {
User user = new User();
user.setId(4L);
user.setName("cwh");
userService.insert(user);
return "success:"+user.toString();
}
@RequestMapping("/updateUserInfo")
public String updateUserInfo() {
User user = new User();
user.setId(4L);
user.setName("menco1");
userService.update(user);
return "success:"+user.toString();
}
@RequestMapping("/deleteUserInfo")
public String deleteUserInfo() {
userService.delete(4);
return "success";
}
} Application.java:
package com.cwh.springbootCache;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
@SpringBootApplication
@EnableCaching //开启缓存
public class Application{
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}注意：这里需要用@EnableCaching开启缓存
运行测试
通过浏览器访问，然后查看控制台打印日志，可以发现第一次访问日志有打印相应的sql语句日志，而第二次之后则没有打印，说明缓存开启成功；
源码下载：https://github.com/Menc0/springbootCache