如何在Java中使用typedef註釋

Question

我有一組方法具有非常類似的註釋聲明，如何縮短它們？不要在任何地方重複它們？

@RequestMapping(value = "/relative_path", 
     method = RequestMethod.GET, 
     consumes = "appilcation/json", 
     produces = "appilcation/json") 
@ResponseBody 
public User method1(HttpServletRequest httpServletRequest, 
        @RequestBody String requestBody) 
{...} 

Answer 1

您可以爲創建彈簧元註釋：

@RequestMapping(value = "/relative_path", 
    method = RequestMethod.GET, 
    consumes = "appilcation/json", 
    produces = "appilcation/json") 
@ResponseBody 
@Target(ElementType.METHOD) 
@Retention(RetentionPolicy.RUNTIME) 
public @interface MyAnnotation { 
} 

，並用它在你的方法：

@MyAnnotation 
public User method1(HttpServletRequest httpServletRequest, 
        @RequestBody String requestBody) { } 

解決方案：

@RequestMapping(method = RequestMethod.POST, 
     consumes = "appilcation/json", 
     produces = "appilcation/json") 
@Target(ElementType.METHOD) 
@Retention(RetentionPolicy.RUNTIME) 
public @interface MyAnnotation { 
} 

@RequestMapping(value = "/relative_path") 
@MyAnnotation 
public User method1(HttpServletRequest httpServletRequest, 
        @RequestBody String requestBody) { }