Redis-08-SpringBoot缓存之Redis方式

说明

• Redis-08-SpringBoot缓存之Redis

操作步骤

》加入依赖

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

》添加配置

spring.redis.host=192.168.3.241
spring.redis.port=6379
spring.redis.password=123456
spring.redis.database=0

spring.cache.type=redis
spring.cache.cache-names=name1,name2

》开启缓存

@SpringBootApplication
@EnableCaching  // 开启缓存
public class MyApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

》简单使用

@RestController
@RequestMapping("/cache")
public class CacheController {

    /*
     * 说明：
     * —— @Cacheable注解中的各个值支持SpEL表达式
     * —— 如果是纯字符串而非SpEL表达式也必须加上单引号
     * —— 以下几种注解方式供参考
     */
    // @Cacheable(cacheNames = "name1", key = "'key1'")
    // @Cacheable(cacheNames = "name1", key = "'uid:' + #user.id")
    // @Cacheable(cacheNames = "name1", key = "#{user.id}")
    @RequestMapping("/hello")
    @Cacheable(cacheNames = "name1", key = "'key1'")
    public String hello() {
        return "hello";
    }

    /*
     * 说明：
     * —— @CachePut更新指定缓存，根据cacheNames、key
     * —— 更新后缓存内容为当前方法的return值
     */
    @RequestMapping("/put")
    @CachePut(cacheNames = "name1", key = "'key1'")
    public String put() {
        return "put";
    }

    /*
     * 说明：
     * —— @CacheEvict删除指定缓存，根据cacheNames、key
     */
    @RequestMapping("/evict")
    @CacheEvict(cacheNames = "name1", key = "'key1'")
    public String evict() {
        return "evict";
    }
}

》处理Redis乱码

@Configuration
public class MyCacheConfig extends CachingConfigurerSupport {
    @Autowired
    private RedisConnectionFactory redisConnectionFactory;

    /*
     * 重写缓存管理者，改用Redis实现
     */
    @Override
    public CacheManager cacheManager() {
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig();
        redisCacheConfiguration = redisCacheConfiguration
                // 不缓存空值
                .disableCachingNullValues()
                // 设置key序列化器（处理Redis中key乱码）
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                //
                /*
                 * 设置value序列化器（处理Redis中value乱码）
                 * 这里简单测试都使用了StringRedisSerializer，你也可以用GenericJackson2JsonRedisSerializer
                 */
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()));

        return RedisCacheManager
                .builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
                .cacheDefaults(redisCacheConfiguration).build();
    }
}