[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #1522: 接口返回值定义的是ResponseEntity，为什么返回值的Body为空？

[GitBox]

liubao68 commented on issue #1522: 接口返回值定义的是ResponseEntity，为什么返回值的Body为空？
URL: 
https://github.com/apache/servicecomb-java-chassis/issues/1522#issuecomment-575428095
 
 
   下面有个例子可以参考下：
   
   ```
     @ResponseHeaders({@ResponseHeader(name = "h1", response = String.class),
         @ResponseHeader(name = "h2", response = String.class)})
     @RequestMapping(path = "/responseEntity", method = RequestMethod.POST)
     public ResponseEntity<Date> responseEntity(InvocationContext c1, 
@RequestAttribute("date") Date date) {
       HttpHeaders headers = new HttpHeaders();
       headers.add("h1", "h1v " + c1.getContext().get(Const.SRC_MICROSERVICE));
   
       InvocationContext c2 = ContextUtils.getInvocationContext();
       headers.add("h2", "h2v " + c2.getContext().get(Const.SRC_MICROSERVICE));
   
       return new ResponseEntity<>(date, headers, HttpStatus.ACCEPTED);
     }
   ```
   
   注意：
   1. 需要显示声明ResponseEntity的模板类型；
   2. 如果还需要返回额外的headers，需要通过ResponseHeaders显示的声明返回的header。 
   
   这个是java-chassis和Spring MVC不同的地方， 接口定义需要是明确的，能够通过契约描述出来实际的类型和header。 
   
   
   

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