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

java">@RestController
@RequestMapping("/user")
@Slf4j
public class UserController {@Autowiredprivate 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;}}