使用jar包:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/>
</parent>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
在application.properties中加入redis的配置信息
#redis
spring.redis.host=127.0.0.1
spring.redis.port=6379
# 数据库连接超时时间,2.0 中该参数的类型为Duration,这里在配置的时候需要指明单位
spring.redis.timeout=60s
# 连接池配置,2.0中直接使用jedis或者lettuce配置连接池
# 最大活跃连接数,负数为不限制
spring.redis.lettuce.pool.max-active=500
# 等待可用连接的最大时间,负数为不限制
spring.redis.lettuce.pool.max-wait=-1ms
# 最大空闲连接数
spring.redis.lettuce.pool.max-idle=100
# 最小空闲连接数
spring.redis.lettuce.pool.min-idle=20
新增RedisConfig.java文件,其中注释掉的两行代码不能打开。打开的话会使value使序例化,序例化了以后会跟后面要使用的@Cacheable不一致,导致取不到值
package com.chenyingjun.springboot2.config;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
/**
* RedisConfig工具类配置
*
* @author chenyingjun
* @since 1.0
* @version 2018年8月15日 chenyingjun
*/
@Configuration
@EnableCaching
public class RedisConfig {
/**
* RedisTemplate配置
*/
@Bean
public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
// 设置序列化
Jackson2JsonRedisSerializer<Object> 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);
// 配置redisTemplate
RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
redisTemplate.setConnectionFactory(lettuceConnectionFactory);
RedisSerializer<?> stringSerializer = new StringRedisSerializer();
// // key序列化
redisTemplate.setKeySerializer(stringSerializer);
// value序列化
// redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
// Hash key序列化
redisTemplate.setHashKeySerializer(stringSerializer);
// Hash value序列化
// redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
redisTemplate.afterPropertiesSet();
return redisTemplate;
}
}
在service层中加入@Cacheable(key="'userId_'+#id", value="user")来缓存信息,这样println只会打印一次
@Cacheable(key="'userId_'+#id", value="user")
public SystemUserVo info(String id) {
System.out.println("-------------------------------------------------------");
SystemUserVo user = systemUserMapper.info(id);
return user;
}
缓存后数据如下图
使用RedisTemplate和StringRedisTemplate来获取缓存中的值,其中obj1也已经获取到了redis中的数据。效果如下