springboot缓存之自定义CacheManager

接上一节。

先要说明的是上一节springboot缓存之使用redis作为缓存管理是springboot的旧版本了，最新的springboot2.x已经不这么用了，而且缓存注解一般用于service上，而不是controller上。百度了下整体代码是这样的：MyRedisConfig.java

EnableCaching // 开启缓存支持
public class MyRedisConfig extends CachingConfigurerSupport {
    @Resource
    private LettuceConnectionFactory lettuceConnectionFactory;


    /**
     * 配置CacheManager
     * @return
     */
    @Bean
    public CacheManager cacheManager() {
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);

        //解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        // 配置序列化（解决乱码的问题）
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
//                .entryTtl(Duration.ZERO)
                .entryTtl(Duration.ofSeconds(20))   //设置缓存失效时间
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();

        RedisCacheManager cacheManager = RedisCacheManager.builder(lettuceConnectionFactory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }


    /**
     * RedisTemplate配置
     */
    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory lettuceConnectionFactory) {
        // 设置序列化
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(
                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<String, Object>();
        redisTemplate.setConnectionFactory(lettuceConnectionFactory);
        RedisSerializer<?> stringSerializer = new StringRedisSerializer();
        redisTemplate.setKeySerializer(stringSerializer);// key序列化
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);// value序列化
        redisTemplate.setHashKeySerializer(stringSerializer);// Hash key序列化
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);// Hash value序列化
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
}

也可以通过这种方式来改变缓存：

package com.gong.springbootcache.service;

import com.gong.springbootcache.bean.Department;
import com.gong.springbootcache.mapper.DepartmentMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.stereotype.Service;

@CacheConfig(cacheNames = "dept")
@Service
public class DepartmentService {

    @Autowired
    DepartmentMapper departmentMapper;

    @Autowired
    CacheManager cacheManager;

    public Department getDeptById(Integer id){
        Department department = departmentMapper.getDeptById(id);
        Cache cache = cacheManager.getCache("dept");
        cache.put(String.valueOf(id),department);
        return department;
    }
}

从缓存管理器中取得名为dept的缓存组件，然后设置缓存的key：id，以及缓存的值：department、

可参考：https://www.jianshu.com/p/d3ee0215c82e