【java】SpringBoot 2.X @Cacheable,redis-cache 如何根据key设置缓存时间?

SpringBoot 2.x 以后,@Cacheable, Redis-cahce 的配置变动比较大

网上找了点资料,目前我的配置是

@Bean

public RedisCacheConfiguration redisCacheConfiguration() {

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);

RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();

redisCacheConfiguration = redisCacheConfiguration.serializeValuesWith(

RedisSerializationContext

.SerializationPair

.fromSerializer(jackson2JsonRedisSerializer)

).entryTtl(Duration.ofMinutes(30));

return redisCacheConfiguration;

}

使用上述代码后,可以成功缓存,但不能对key指定缓存时间,

【java】SpringBoot 2.X @Cacheable,redis-cache 如何根据key设置缓存时间?

如图,两个 key UserInfoList 和 key UserInfoListAnother 都是默认的30分钟

2.X以后无法再使用 RedisCacheManager rcm = new RedisCacheManager(redisTemplate) 构造方法来设置缓存时间,请问该如何配置?

回答

google 了一晚上,终于找到了比较满意的方法,下面是整个的 RedisCacheConfig 文件

@Configuration

public class RedisCacheConfig {

@Bean

public KeyGenerator simpleKeyGenerator() {

return (o, method, objects) -> {

StringBuilder stringBuilder = new StringBuilder();

stringBuilder.append(o.getClass().getSimpleName());

stringBuilder.append(".");

stringBuilder.append(method.getName());

stringBuilder.append("[");

for (Object obj : objects) {

stringBuilder.append(obj.toString());

}

stringBuilder.append("]");

return stringBuilder.toString();

};

}

@Bean

public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {

return new RedisCacheManager(

RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory),

this.getRedisCacheConfigurationWithTtl(600), // 默认策略,未配置的 key 会使用这个

this.getRedisCacheConfigurationMap() // 指定 key 策略

);

}

private Map<String, RedisCacheConfiguration> getRedisCacheConfigurationMap() {

Map<String, RedisCacheConfiguration> redisCacheConfigurationMap = new HashMap<>();

redisCacheConfigurationMap.put("UserInfoList", this.getRedisCacheConfigurationWithTtl(3000));

redisCacheConfigurationMap.put("UserInfoListAnother", this.getRedisCacheConfigurationWithTtl(18000));

return redisCacheConfigurationMap;

}

private RedisCacheConfiguration getRedisCacheConfigurationWithTtl(Integer seconds) {

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);

RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();

redisCacheConfiguration = redisCacheConfiguration.serializeValuesWith(

RedisSerializationContext

.SerializationPair

.fromSerializer(jackson2JsonRedisSerializer)

).entryTtl(Duration.ofSeconds(seconds));

return redisCacheConfiguration;

}

}

要指定 key 的过期时间,只要在getRedisCacheConfigurationMap方法中添加就可以。
然后只需要 @Cacheable 就可以把数据存入 redis

    @Cacheable(value = "UserInfoList", keyGenerator = "simpleKeyGenerator") // 3000秒

@Cacheable(value = "UserInfoListAnother", keyGenerator = "simpleKeyGenerator") // 18000秒

@Cacheable(value = "DefaultKeyTest", keyGenerator = "simpleKeyGenerator") // 600秒,未指定的key,使用默认策略

使用Spring Boot了当然是使用Redis的自动装配了,只需要引入redis-starter即可开箱用
`

redisTemplate.opsForValue().set(key, value, expires, timeUnit)

`

补充一下你的Bean

@Bean

public RedisCacheConfiguration redisCacheConfiguration(RedisTemplate<String, Object> template, CacheStrategy stategy) {

redisCacheManager.setExpires(strategy.getExpiresMap);

return redisCacheConfiguration;

}

然后配置CacheStrategy类

public static final String KEY = "_TEST";

public static Long CACHE_TIME = 10000L;

private Map<String, Long> expiresMap = null;

@PostConstruct

public void init(){

expiresMap = Maps.newHashMap();

expiresMap.put(KEY, CACHE_TIME);

}

public Map<String, Long> getExpiresMap(){

return this.expiresMap;

}

然后使用Cacheable注解的时候可以使用指定key,也可以使用Spring的自动生成策略key具体方法

@Cacheable(value = "", key =)// 自定义key策略

@Cacheable(value = "")//自动生成key策略

还有一种方式是使用SpEL表达式方式

@Cacheable(value = "example#${select.cache.timeout:1000}", key = "")//example 是cache容器名字 #后边的是SpEL表达式

不知道是否可以直接解决你的问题,如果愿意你可以作一个参考

请问,为什么key是用两个冒号(::)隔开得,为什么不是一个?可以更换成一个么?

RedisCacheConfiguration redisCacheConfiguration = config

.serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))

.computePrefixWith(name -> name + ":")

.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer));

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