Spring Cache代理对象 redis篇

SpringCache 代理对象

1、@EnableCaching
1、开启缓存注解功能，通常加在启动类上
2、@CachePut
1、将方法的返回值放到缓存中
3、@Cacheable
1、查看缓存中有没有数据，有就直接返回，没有就调用方法查数据，并将方法返回值放到缓存中
2、注意：会现在方法调用之前执行，缓存有数据就不会调用方法
4、@CacheEvict
1、删除一个缓存或多个缓存数据
2、注意：删除全部是不用指定的id，用allEntries = true

代码理解

@RestController
@RequestMapping("/user")
@Slf4j
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @PostMapping
    @CachePut(cacheNames = "userCache", key = "#user.id")//如果使用spring cache缓存数据, key的生成: userCache::2
    //@CachePut(cacheNames = "userCache", key = "#result.id")//result指return 返回的对象 "."成为对象导航
    //@CachePut(cacheNames = "userCache", key = "#p0.id")//指第一个参数
    //@CachePut(cacheNames = "userCache", key = "#a0.id")
    //@CachePut(cacheNames = "userCache", key = "#root.args[0].id")
    public User save(@RequestBody User user){
        userMapper.insert(user);
        return user;
    }

    @DeleteMapping
    @CacheEvict(cacheNames = "userCache", key = "#id")
    public void deleteById(Long id){
        userMapper.deleteById(id);
    }

	@DeleteMapping("/delAll")
    @CacheEvict(cacheNames = "userCache", allEntries = true)
    public void deleteAll(){
        userMapper.deleteAll();
    }

    @GetMapping
    //参数就是id,不需要“."的对象导航了
    //可以ctrl+鼠标点击key弹出源码有提示
    @Cacheable(cacheNames = "userCache", key = "#id")
    public User getById(Long id){
        User user = userMapper.getById(id);
        return user;
    }

}
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