springboot缓存@Cacheable的使用,及设置过期时间

1,在启动类Application中增加注解@EnableCaching

springboot缓存@Cacheable的使用,及设置过期时间_第1张图片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 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 redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer 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

你可能感兴趣的:(java,redis,缓存,java)