java - RestController 中的 Spring RequestMapping 返回 406

Question

在@RestController内部，我有一个@RequestMapping，它可以工作，除非我在尝试返回POJO类ResponseVO时在客户端中收到406

@RequestMapping(value = "path", method = RequestMethod.POST
            , produces = MediaType.APPLICATION_JSON_VALUE)
    public @ResponseBody ResponseEntity<GenericResponse> path(

...
ResponseVO responseVO = new responseVO();
return new ResponseEntity<>(responseVO, HttpStatus.OK);

我正在发送带有 JSON 正文的 POST，我的请求 header :

Connection: keep-alive
Content-Type: application/json
Accept: */*
Content-Length: 58
Host: localhost:8080
User-Agent: Apache-HttpClient/4.5.6 (Java/1.8.0_151)

响应 header :

HTTP/1.1 406 Not Acceptable
Server: Apache-Coyote/1.1
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Access-Control-Allow-Methods: POST, GET, PUT, OPTIONS, DELETE
Access-Control-Max-Age: 3600
Access-Control-Allow-Headers: X-Requested-With, Content-Type, Authorization, Origin, Accept, Access-Control-Request-Method, Access-Control-Request-Headers
Content-Type: text/html;charset=utf-8
Content-Language: en
Content-Length: 1067

Answer 1

当您使用@RestController时，它自动意味着您正在Spring Boot中注释@Controller和@ResponseBody。因此，您不需要明确地在方法上添加 @ResponseBody 注释。另外 @ResponseBody 注解添加在方法上方，而不是与方法声明一起添加。因此，即使您正确添加此注释，您的代码也应该可以正常工作。请看下面。

@RequestMapping(value = "path", method = RequestMethod.POST, produces =MediaType.APPLICATION_JSON_VALUE)
@ResponseBody 
public ResponseEntity<GenericResponse> path(

...
    ResponseVO responseVO = new responseVO();
    return new ResponseEntity<>(responseVO, HttpStatus.OK);