springboot缓存@Cacheable的使用，及设置过期时间_cacheable缓存时间

1，在启动类Application中增加注解@EnableCaching

2，待缓存的方法上方增加@Cacheable注解

@Cacheable(cacheNames = redisContains.REDIS_SHOW_TEXT,key = "#bodyParams.getString('textCode')")

这其中，key即接收参数中的某个数据，例如：

若方法的接收参数为JSONObject bodyParams   则key的值可以写为key = "#bodyParams.getString('textCode')"。

若接收参数为：SysDictData dictData 则key的值可以写为：key = "#dictData.beginTime"

若接收参数为：String id  则key的值可以写为：key="#id"

3，目前是无法设置过期时间的

期望能达到此效果，设置#30，可以设置30秒过期时间，方式如下：

3.1，创建RedisConfigCacheManager类

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.data.redis.cache.*;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
 
import java.time.Duration;
 
/**
 * redis 配置类
 */
@Slf4j
public class RedisConfigCacheManager extends RedisCacheManager {
 
 
    public RedisConfigCacheManager(RedisCacheWriter cacheWriter, RedisCacheConfiguration defaultCacheConfiguration) {
        super(cacheWriter, defaultCacheConfiguration);
    }
 
    private static final RedisSerializationContext.SerializationPair<Object> DEFAULT_PAIR = RedisSerializationContext.SerializationPair
            .fromSerializer(new GenericJackson2JsonRedisSerializer());
 
    private static final CacheKeyPrefix DEFAULT_CACHE_KEY_PREFIX = cacheName -> cacheName+":";
 
    @Override
    protected RedisCache createRedisCache(String name, RedisCacheConfiguration cacheConfig) {
        final int lastIndexOf = StringUtils.lastIndexOf(name, '#');
        if (lastIndexOf > -1) {
            final String ttl = StringUtils.substring(name, lastIndexOf + 1);
            final Duration duration = Duration.ofSeconds(Long.parseLong(ttl));
            cacheConfig = cacheConfig.entryTtl(duration);
            //修改缓存key和value值的序列化方式
            cacheConfig = cacheConfig.computePrefixWith(DEFAULT_CACHE_KEY_PREFIX)
                    .serializeValuesWith(DEFAULT_PAIR);
            final String cacheName = StringUtils.substring(name, 0, lastIndexOf);
            return super.createRedisCache(cacheName, cacheConfig);
        }else{
            //修改缓存key和value值的序列化方式
            cacheConfig = cacheConfig.computePrefixWith(DEFAULT_CACHE_KEY_PREFIX)
                    .serializeValuesWith(DEFAULT_PAIR);
            return super.createRedisCache(name, cacheConfig);
        }
    }
 
 
}

3.2，创建CacheConfig类

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
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.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
 
import java.time.Duration;
 
 
@Configuration
public class CacheConfig {
 
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
 
        ObjectMapper om = new ObjectMapper();
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(
                Object.class);
        // 解决查询缓存转换异常的问题
        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.ofMillis(-1))
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer))
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))
                .disableCachingNullValues();
        RedisCacheWriter cacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory);
 
        return new RedisConfigCacheManager(cacheWriter, config);
 
    }
 
}

至此，即可实现，加上#30可以实现30秒缓存，不加#即-1不限时间缓存。

参考：https://www.cnblogs.com/mrsans/articles/14113591.html