SpringBoot 配置 Redis 多缓存名(不同缓存名缓存失效时间不同)

import com.google.common.collect.ImmutableMap;
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.RedisCacheManager;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;
import java.util.Map;

@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String, Object> redisTemplate(LettuceConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate();
        template.setConnectionFactory(factory);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        //配置使用FastJson进行序列化和反序列化操作
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
        template.setKeySerializer(stringRedisSerializer);
        template.setHashKeySerializer(stringRedisSerializer);
        template.setValueSerializer(fastJsonRedisSerializer);
        template.setHashValueSerializer(fastJsonRedisSerializer);
        template.afterPropertiesSet();
        //开启Redis事务
        /**
        * 为何要开启事务呢？redis本身是单线程执行的one by one 
        * 虽然都是原子性操作，那需要多个原子性的操作才算一个完整的事件呢
        * 譬如 redis get set可能就是一对操作才能保证操作的完整性
        * 譬如记录访问数 value 从0开始，在并发情况下多线程会同时查询到 value 为0 的情况，
        * 此时两线程都得到value 0 为此都 +1操作 执行结果 value=1,而我们期望的结果至少是2才对
        * 所以需要用事务来解决这一堆操作(get set)
        */
        template.setEnableTransactionSupport(true);
        return template;
    }

    @Bean
    public CacheManager cacheManager(RedisTemplate<String, Object> template) {
        
        //配置多个缓存名称 这里我们用个能用的模板  这里有坑点往下看
        RedisCacheConfiguration templateRedisCacheCfg = RedisCacheConfiguration
                .defaultCacheConfig()
                // 设置key为String
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(template.getStringSerializer()))
                // 设置value 为自动转Json的Object
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(template.getValueSerializer()))
                // 不缓存null
                .disableCachingNullValues();
        //这里对RedisCacheConfiguration不熟悉的可能会有疑问，我们这样批量templateRedisCacheCfg.entryTtl(Duration.ofMinutes(15))最后不都是同一个引用吗，过期时间会生效吗？
        Map<String, RedisCacheConfiguration> expires = ImmutableMap.<String, RedisCacheConfiguration>builder()
                .put("15m", templateRedisCacheCfg.entryTtl(Duration.ofMinutes(15)))
                .put("30m", templateRedisCacheCfg.entryTtl(Duration.ofMinutes(30)))
                .put("60m", templateRedisCacheCfg.entryTtl(Duration.ofMinutes(60)))
                .put("1d", templateRedisCacheCfg.entryTtl(Duration.ofDays(1)))
                .put("30d", templateRedisCacheCfg.entryTtl(Duration.ofDays(30)))
                .put("common-30d", templateRedisCacheCfg.entryTtl(Duration.ofDays(30)))
                .build();

        RedisCacheManager redisCacheManager =
                RedisCacheManager.RedisCacheManagerBuilder
                        // Redis 连接工厂
                        .fromConnectionFactory(template.getConnectionFactory())
                        // 默认缓存配置
                        .cacheDefaults(templateRedisCacheCfg.entryTtl(Duration.ofHours(1)))
                        // 配置同步修改或删除 put/evict
                        .transactionAware()
                        .initialCacheNames(expires.keySet())
                        .withInitialCacheConfigurations(expires)
                        .build();
        return redisCacheManager;
    }
}

序列化类

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;


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,SerializerFeature.WriteNullStringAsEmpty,SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNullListAsEmpty).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);
    }
}