java - 测试 Controller 方法失败并抛出 HttpMessageNotReadableException

Question

我有以下 mock

mockMvc.perform(get("/bk/getBks?sd="+1262296800000L+"&nod=3"))
    .andDo(print());

这是我的 Controller

@RestController
@RequestMapping("/bk")
public class BkController {
    @RequestMapping(value = "/getBks", method = RequestMethod.GET)
    public ResponseEntity<List<BkDTO>> getBks(@Valid @RequestBody GetBksForm form, BindingResult result) throws ... {
        return ...;
    }

}

还有我的验证表单

public class GetBksForm {

    @Min(1000000000000L)
    private Long sd;

    @Min(1)
    private int nod;

    setters and getters
}

问题是它不断抛出以下异常，我不明白为什么。

MockHttpServletRequest:
         HTTP Method = GET
         Request URI = /bk/getBks
          Parameters = {sd=[1262296800000], nod=[3]}
             Headers = {}

             Handler:
                Type = com.ihbs.booking.BkController
              Method = public org.springframework.http.ResponseEntity<java.util.List<com.ihbs.bk.BkDTO>> com.ihbs.bk.BkController.getBks(com.ihbs.bk.GetBksForm,org.springframework.validation.BindingResult) throws ...

               Async:
       Async started = false
        Async result = null

  Resolved Exception:
                Type = org.springframework.http.converter.HttpMessageNotReadableException

        ModelAndView:
           View name = null
                View = null
               Model = null

            FlashMap:

MockHttpServletResponse:
              Status = 400
       Error message = null
             Headers = {}
        Content type = null
                Body = 
       Forwarded URL = null
      Redirected URL = null
             Cookies = []

我看起来它找到了处理程序，但它不知道如何读取请求，而且我不明白为什么。

Answer 1

根据RequestBody javadoc:

Annotation indicating a method parameter should be bound to the body of the web request. The body of the request is passed through an HttpMessageConverter to resolve the method argument depending on the content type of the request. Optionally, automatic validation can be applied by annotating the argument with @Valid.

因此，如果您想使用 RequestBody，应将请求参数以 JSON 格式放入请求正文部分，并按如下所示更改单元测试:

mvc.perform(
            get("/bk/getBks").content("{\"sd\": \"1262296800000L\", \"nod\":\"3\"}").contentType(APPLICATION_JSON)).andDo(print());
}

以这种方式传输域对象比通过请求参数传输更好。

<小时/>

更新

如果将请求参数绑定(bind)到域对象，只需删除@RequestParam，Spring就会将请求参数绑定(bind)到域对象。