SpringCache快速入门

引入依赖

<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>

主启动类加注解：@EnableCaching

配置application.properties：spring.cache.type=REDIS

配置json序列化

@Configuration
@EnableCaching
public class CacheConfig {
    private static final Integer REDIS_TTL = 60;
    @Bean
    public RedisCacheConfiguration redisCacheConfiguration() {
        return RedisCacheConfiguration.defaultCacheConfig()
                // 1. 设置缓存有效期
                .entryTtl(Duration.ofSeconds(REDIS_TTL))
                // 2. 设置 Key 的序列化方式为 String
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                // 3. 设置 Value 的序列化方式为 JSON
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()))
                // 4. 不缓存空值
                .disableCachingNullValues();
    }
}

方法上添加注解：@Cacheable、@CachePut、@CacheEvict

@Service
public class UserService {

    // 1. 先查缓存有就用; 没有执行完方法体,将返回结果进行缓存
    @Cacheable(cacheNames = "user", key = "#id", unless = "#result==null")
    public User getById(Long id) {
        System.out.println("======执行了方法体=======");
        return new User(1, "张三", "shanghai");
    }

    // 先执行方法体, 后更新缓存
    @CachePut(cacheNames = "user", key = "#result.id")
    public User updateUser() {
        System.out.println("======执行了方法体=======");
        return new User(1, "张三", "shanghai");
    }

    // 3. 执行完方法体后删除缓存
    @CacheEvict(cacheNames = "user", key = "#id")
    public void deleteUser(Long id) {
        System.out.println("======执行了方法体=======");
    }

}