在java中我们可以编写config类，通过重写CacheManager方法，使redis成为项目中的缓存。

当然除了这个配置类以外，也还需要现在yml文件中配置好redis的host，password等配置。

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.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.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.*;
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;
import java.util.HashMap;
import java.util.Map;
 
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
 
    /**
     * json序列化
     * @return
     */
    public RedisSerializer<Object> jackson2JsonRedisSerializer () {
        //使用jackson2JsonRedisSerializer来序列化和反序列化
        Jackson2JsonRedisSerializer<Object> serializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper mapper = new ObjectMapper();
        mapper.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        serializer.setObjectMapper(mapper);
        return serializer;
    }
 
    @Bean
    public CacheManager cacheManager (RedisConnectionFactory connectionFactory) {
        //生成一个默认配置，通过config对象即可对缓存进行自定义配置
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig();
        config = config
                //设置 key为string序列化
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                //设置value为json序列化
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer()))
                //不缓存空值
                .disableCachingNullValues()
                //设置缓存的默认过期时间30分钟
                .entryTtl(Duration.ofMinutes(30L));
 
        //特殊缓存空间应用不同的配置
        Map<String, RedisCacheConfiguration> map = new HashMap<>();
        map.put("logs", config.entryTtl(Duration.ofMinutes(30L)));
        map.put("Userinfo", config.entryTtl(Duration.ofDays(1L)));
 
        RedisCacheManager cacheManager = RedisCacheManager.builder(connectionFactory)
                .cacheDefaults(config)
                .withInitialCacheConfigurations(map)
                .transactionAware()
                .build();
 
        return cacheManager;
    }
}