使用spring @RestController在null上返回HTTP 204 [英] Return HTTP 204 on null with spring @RestController

问题描述

使用Content-Length返回200 OK：0

This returns 200 OK with Content-Length: 0

@RestController
public class RepoController {
    @RequestMapping(value = "/document/{id}", method = RequestMethod.GET)
    public Object getDocument(@PathVariable long id) {
       return null;
    }

}

简单地说我喜欢它在null上返回204 No Content。

Simply put I'd like it to return 204 No Content on null.

有没有办法强制spring-mvc / rest在null而不是200时返回204？我不想更改每个rest方法以返回ResponseEntity或类似的东西，只将null映射到204

Is there a way to force spring-mvc/rest to return 204 on null not 200? I dont want to change every rest method to return ResponseEntity or something like that, only map null to 204

推荐答案

当然是的。

选项1：

@RestController
public class RepoController {
    @RequestMapping(value = "/document/{id}", method = RequestMethod.GET)
    public Object getDocument(@PathVariable long id, HttpServletResponse response) {
       Object object = getObject();
       if( null == object ){
          response.setStatus( HttpStatus.SC_NO_CONTENT);
       }
       return object ;
    }
}

选项2：

@RestController
public class RepoController {
    @RequestMapping(value = "/document/{id}", method = RequestMethod.GET)
    public Object getDocument(@PathVariable long id) {
       Object object = getObject();
       if ( null == object ){
          return new ResponseEntity<Void>(HttpStatus.NO_CONTENT);
       }

       return object ;
    }
}

可能有拼写错误，但你明白了。

Might have typos, but you get the concept.

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