springboot緩存之自定義CacheManager

接上一節。

先要說明的是上一節springboot緩存之使用redis作為緩存管理是springboot的舊版本了，最新的springboot2.x已經不這么用了，而且緩存注解一般用於service上，而不是controller上。百度了下整體代碼是這樣的：MyRedisConfig.java

EnableCaching // 開啟緩存支持
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);

        //解決查詢緩存轉換異常的問題
        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（解決亂碼的問題）
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
//                .entryTtl(Duration.ZERO)
                .entryTtl(Duration.ofSeconds(20))   //設置緩存失效時間
                .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) {
        // 設置序列化
        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;
    }
}

也可以通過這種方式來改變緩存：

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;
    }
}

從緩存管理器中取得名為dept的緩存組件，然后設置緩存的key：id，以及緩存的值：department、

可參考：https://www.jianshu.com/p/d3ee0215c82e