Spring Boot 整合 Redis 实现数据缓存案例详解

<!--引入 redis starter 的maven依赖-->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

spring.redis.host=192.168.204.211
spring.redis.port=6379
spring.redis.password=xxx
spring.redis.database=0
# 设置连接池配置等(如有需要)
spring.redis.lettuce.pool.max-active=xxx
spring.redis.lettuce.pool.max-idle=xxx

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.impl.LaissezFaireSubTypeValidator;
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.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;
/**
 * 自定义 Redis缓存相关配置
 */
@EnableCaching
@Configuration
public class MyRedisConfig {
    /**
     * 自定义CacheManager管理器
     * @param redisConnectionFactory
     * @return
     */
    @Bean
    public RedisCacheManager redisCacheManager(RedisConnectionFactory redisConnectionFactory){
        RedisSerializer<String> redisSerializer = new StringRedisSerializer();
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        //解决查询缓存转换异常的问题
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);//这一句必须要，作用是序列化时将对象全类名一起保存下来
        om.activateDefaultTyping(LaissezFaireSubTypeValidator.instance, 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.ofSeconds(300))//设置 key 过期时间
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(redisSerializer)) //设置key序列化规则
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(jackson2JsonRedisSerializer))//设置value序列化规则
                .disableCachingNullValues();
        RedisCacheManager cacheManager = RedisCacheManager.builder(redisConnectionFactory)
                .cacheDefaults(config)
                .build();
        return cacheManager;
    }
}

/**
 * 如果有多个cacheManager,也可以来手动指定使用哪个
 */
@Override
@Cacheable(value = "user", key = "#root.methodName +'['+ #id +']'",cacheManager = "redisCacheManager")
public User getUser(Integer id) {
    log.info("用户"+id+"开始执行数据库查询");
    User user =  userMapper.getUser(id);   
    return user;
}

@Override
public User getUser(Integer id) {
    log.info("用户"+id+"开始执行数据库查询");
    User user =  userMapper.getUser(id);   
     //可以直接使用CacheManager来对中间结果缓存
    Cache cache = cacheManager.getCache("user");
    cache.put("test",1111);
    return user;
}