（十五）SpringBoot之使用Redis做缓存数据

<?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.shyroke.redis</groupId>
<artifactId>springboot_redis</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging> <name>springboot_redis</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.7.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-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build></project>

server.port=8888#数据库连接配置
spring.datasource.url=jdbc:mysql://localhost/db_boot?useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver# JPA
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto= update#redis
spring.cache.type=redis
spring.redis.host=localhost
spring.redis.port=6379
#spring.redis.password=
#spring.redis.database=0
#spring.redis.pool.max-active=8
#spring.redis.pool.max-idle=8
#spring.redis.pool.max-wait=-1
#spring.redis.pool.min-idle=0
#spring.redis.timeout=0

package com.shyroke.config;import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;import java.lang.reflect.Method;@Configuration
public class RedisConfig extends CachingConfigurerSupport { /*
* 定义缓存数据 key 生成策略的bean 包名+类名+方法名+所有参数
*/
@Bean
public KeyGenerator wiselyKeyGenerator(){
return new KeyGenerator() {
@Override
public Object generate(Object target, Method method, Object... params) {
StringBuilder sb = new StringBuilder();
sb.append(target.getClass().getName());
sb.append(method.getName());
for (Object obj : params) {
sb.append(obj.toString());
}
return sb.toString();
}
}; } /*
* 要启用spring缓存支持,需创建一个 CacheManager的 bean，CacheManager 接口有很多实现，这里Redis 的集成，用
* RedisCacheManager这个实现类 Redis 不是应用的共享内存，它只是一个内存服务器，就像 MySql 似的，
* 我们需要将应用连接到它并使用某种“语言”进行交互，因此我们还需要一个连接工厂以及一个 Spring 和 Redis 对话要用的
* RedisTemplate， 这些都是 Redis 缓存所必需的配置，把它们都放在自定义的 CachingConfigurerSupport 中
*/
@Bean
public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {
RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
// cacheManager.setDefaultExpiration(60);//设置缓存保留时间（seconds）
return cacheManager;
} // 1.项目启动时此方法先被注册成bean被spring管理,如果没有这个bean，则redis可视化工具中的中文内容（key或者value）都会以二进制存储，不易检查。
@Bean
public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
StringRedisTemplate template = new StringRedisTemplate(factory);
Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
ObjectMapper om = new ObjectMapper();
om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
jackson2JsonRedisSerializer.setObjectMapper(om);
template.setValueSerializer(jackson2JsonRedisSerializer);
template.afterPropertiesSet();
return template;
}
}

@SpringBootApplication
@EnableCaching
public class SpringbootRedisApplication { public static void main(String[] args) {
SpringApplication.run(SpringbootRedisApplication.class, args);
}
}

package com.shyroke.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.shyroke.bean.UserBean;
import com.shyroke.mapper.UserMapper;
import com.shyroke.service.UserServiceI;
import com.shyroke.util.DateUtil;@Controller
@RequestMapping(value = "/")
public class IndexController { @Autowired
private UserServiceI userService; @ResponseBody
@RequestMapping(value = "/get")
public UserBean get() { return userService.getUserById(1); } @ResponseBody
@RequestMapping(value="/update")
public UserBean update() { UserBean user=userService.getUserById(1);
user.setCreateTime(DateUtil.getDataFormat());
user.setUserName("test");
return userService.update(user);
} @ResponseBody
@RequestMapping(value="/del")
public String del() {
return userService.del(1);
}}

package com.shyroke.service;import com.shyroke.bean.UserBean;public interface UserServiceI { UserBean getUserById(int i); UserBean update(UserBean user); String del(int id);}

package com.shyroke.service.impl;import org.springframework.beans.factory.annotation.Autowired;
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 org.springframework.stereotype.Service;import com.shyroke.bean.UserBean;
import com.shyroke.mapper.UserMapper;
import com.shyroke.service.UserServiceI;@Service
@CacheConfig(cacheNames="users")
public class UserServiceImpl implements UserServiceI { @Autowired
private UserMapper userMapper; @Cacheable(key="'userCache'")
@Override
public UserBean getUserById(int i) {
System.out.println("执行这里，说明缓存中读取不到数据，直接读取数据库....");
return userMapper.findOne(i);
} @CachePut(key="'userCache'")
@Override
public UserBean update(UserBean user) {
System.out.println("执行这里，更新数据库，更新缓存....");
return userMapper.save(user);
} @CacheEvict(key="'userCache'")
@Override
public String del(int id) {
userMapper.delete(id);
return "删除成功！！！！";
}}

package com.shyroke.mapper;import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;import com.shyroke.bean.UserBean;@Repository
public interface UserMapper extends JpaRepository<UserBean,Integer> {}