Spring @MVC和带有x-www-form-urlencoded数据的@RequestBody批注? [英] Spring @MVC and the @RequestBody annotation with x-www-form-urlencoded data?

问题描述

我试图弄清楚为什么当Spring @Controller处理程序方法包含@RequestBody批注时，我无法从jQuery.ajax调用接收请求的原因.请考虑以下内容:

I am trying to figure out why I can't receive a request from a jQuery.ajax call when then Spring @Controller handler method includes a @RequestBody annotation. Consider the following:

HTML/JavaScript :

<form id="foo" action="/baz">
  <input name="bar">
</form>

<script>
  $(function() {
    var $fooForm = $('#foo');

    $fooForm.on('submit', function(evt) {
      evt.preventDefault();

      $.ajax({
        url: $fooForm.action,
        data: $fooForm.serialize(),
        dataType: 'json',
        type: 'POST',
        success: function(data) { console.log(data); }
      });
    });
  });
</script>

Java :

@RequestMapping(
  value = "/baz",
  method = RequestMethod.POST,
  consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE,
  produces = MediatType.APPLICATION_JSON_VALUE
)
public @ResponseBody SearchResults[] jqueryPostHandler(
  @RequestBody FormDataObject formData)
{
  return this.searchService.find(formData);
}

以上操作将失败，并带有@RequestBody批注，并返回415错误(不会生成异常).但是，如果删除了@RequestBody批注(即参数签名仅为FormDataObject formData)，则将调用该方法，并将JSON返回到JavaScript.

The above will fail with the @RequestBody annotation present and return a 415 error (no exception will be generated). But if the @RequestBody annotation is removed (i.e. the parameter signature is just FormDataObject formData) then the method will be called and JSON will be returned to the JavaScript.

为什么会这样? POST请求将数据包含在请求的正文中.注释处理不应该这样吗?

Why is this the case? A POST request includes the data in the body of the request. Shouldn't the annotation process such a request?

我意识到我可以将JavaScript发送的内容类型更改为application/json，将consumes属性更改为MediaType.APPLICATION_JSON_VALUE，以使注释正常工作.但是，为什么它不能与普通表单请求一起使用?

I realize that I could change the content type sent by the JavaScript to application/json and the consumes property to MediaType.APPLICATION_JSON_VALUE to make the annotation work correctly. But why doesn't it work with a normal form request?

注意:我正在使用Spring 3.1.4.

Note: I am using Spring 3.1.4.

推荐答案

您是否尝试过登录'org.springframework.web'来查找返回状态代码的原因?在将其转换为415之前，应该引发并记录该异常.

Have you tried turning up logging on 'org.springframework.web' to find out the reason for the returned status code? There should be an exception raised and logged before it's translated to a 415.

如果要发送表单数据，为什么不直接删除@RequestBody.然后，您将使用将Servlet请求参数应用于对象字段的数据绑定(即@ModelAttribute).这比使用FormHttpMessageConverter更好.

Also if sending form data, why not just leave out the @RequestBody. You'll then be use data binding (i.e. @ModelAttribute) that will apply Servlet request parameters to object fields. This is preferable to using the FormHttpMessageConverter.

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