【spring boot】2.0 配置@cacheable 自定义序列化方式 缓存数据到redis

转自 https://blog.csdn.net/b376924098/article/details/79820642

一·背景描述

  spring 的  @cacheable 已成为我们比较常用的缓存数据的方式，但是把非String对象缓存到redis后在使用RedisDesktopManager等软件查看缓存的数据的时候 展示的是HEX 数据，观察起来比较不方便，所以我们这里自定义了FastJsonRedisSerializer 序列化对象后缓存到redis，可以更 方便的观察缓存数据。

二·引入jar包

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastJson</artifactId>
   <version>1.2.38</version>
</dependency>

ps:导入fastjson 某些版本运行时会报com.alibaba.fastjson.JSONException: autoType is not support.错,在FastJsonRedisSerializer类中加入

 static {
        ParserConfig.getGlobalInstance().addAccept("com.xxxx.blog"); //com.xxxx.blog换成自己的包名..........
    }

即可解决

三·代码

1·自定义序列化方式

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

/**
* 说明:自定义redis序列化方式
*
* @author WangBin
* @version V1.0
* @since 2018.03.22
*/
public class FastJsonRedisSerializer<T> implements RedisSerializer<T> {

public static final Charset DEFAULT_CHARSET = Charset.forName( "UTF-8");

private Class<T> clazz;

public FastJsonRedisSerializer(Class<T> clazz) {
super();
this.clazz = clazz;
}

@Override
public byte[] serialize(T t) throws SerializationException {
if (t == null) {
return new byte[ 0];
}
return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
}

@Override
public T deserialize(byte[] bytes) throws SerializationException {
if (bytes == null || bytes.length <= 0) {
return null;
}
String str = new String(bytes, DEFAULT_CHARSET);
return JSON.parseObject(str, clazz);
}
}

2·配置

import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.serializer.RedisSerializationContext;

import java.time.Duration;

/**
*
* @author WangBin
* @version V1.0
* @date 2017.12.05
*/
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
/**
* 设置 redis 数据默认过期时间
* 设置@cacheable 序列化方式
* @return
*/
@Bean
public RedisCacheConfiguration redisCacheConfiguration(){
FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
RedisCacheConfiguration configuration = RedisCacheConfiguration.defaultCacheConfig();
configuration = configuration.serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(fastJsonRedisSerializer)).entryTtl(Duration.ofDays( 30));
return configuration;
}
}