springboot 整合 redis + @cacheAble

 

注意启动类要上加@EnableCaching注解

1、写一个redisConfig，吧cacheable的缓存指定到redis里

2、servie层加@Cacheable(value = "user_cache", key = "#uid", unless="#result == null")

unless="#result == null表示结果为null不缓存

3、第一次访问接口/get  会进入 Cacheable 有请求过来，之后就没有打印

 

4、后面直接从缓存获取，如图

5、可以配合spring表达式使用：

package com.alibaba.first.controller.cache;

/**
 * @author keying
 * @date 2021/4/28
 */
public class CacheName {

    public final static  String USER_CACHE = "USER_CACHE";

    public final static  String USER_CACHE2 = "USER_CACHE2";
}

    @Cacheable(value = {CacheName.USER_CACHE}, key = "T(com.alibaba.first.controller.cache.CacheName).USER_CACHE2 +'_'+ #uid", unless="#result == null")

import java.time.Duration;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
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.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * @author keying
 * @date 2021/4/9
 */
@Configuration
@EnableCaching
public class RedisCacheConfig {
    @Bean
    public RedisTemplate empRedisTemplate(RedisConnectionFactory redisConnectionFactory)
        throws Exception {
        RedisTemplate template = new RedisTemplate<>();
        template.setConnectionFactory(redisConnectionFactory);
        // Json序列化配置
        Jackson2JsonRedisSerializer