jQuery Spring @MVC 和带有 x-www-form-urlencoded 数据的 @RequestBody 注释？

Spring @MVC and the @RequestBody annotation with x-www-form-urlencoded data?

提问by James Sumners

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

我试图弄清楚为什么当 Spring@Controller处理程序方法包含@RequestBody注释时我无法从 jQuery.ajax 调用接收请求。考虑以下：

HTML/JavaScript:

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:

爪哇：

@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);
}

The above will fail with the @RequestBodyannotation present and return a 415 error (no exception will be generated). But if the @RequestBodyannotation 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.

以上将因@RequestBody存在注释而失败并返回 415 错误（不会生成异常）。但是如果@RequestBody注释被移除（即参数签名只是FormDataObject formData），那么该方法将被调用并且 JSON 将返回给 JavaScript。

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

为什么会这样？甲POST请求包括在请求的主体中的数据。注释不应该处理这样的请求吗？

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

我意识到我可以更改 JavaScript 发送的内容类型 toapplication/json和consumes属性 toMediaType.APPLICATION_JSON_VALUE以使注释正常工作。但是为什么它不适用于正常的表单请求？

Note: I am using Spring 3.1.4.

注意：我使用的是 Spring 3.1.4。

回答by Rossen Stoyanchev

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.

您是否尝试过打开“org.springframework.web”登录以找出返回状态代码的原因？在将异常转换为 415 之前，应该引发并记录异常。

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.

此外，如果发送表单数据，为什么不忽略@RequestBody。然后，您将使用数据绑定（即@ModelAttribute）将 Servlet 请求参数应用于对象字段。这比使用 FormHttpMessageConverter 更可取。

回答by Qianyue

As the Spring Docs of @RequestBodysays, the request body would be converted to your object by HttpMessageConverter.

正如@RequestBody的Spring Docs所说，请求正文将通过HttpMessageConverter.

There are 4 default HttpMessageConverters:

有 4 个默认的 HttpMessageConverters：

• ByteArrayHttpMessageConverter: converts byte arrays.
• StringHttpMessageConverter: converts strings.
• FormHttpMessageConverter: converts form data to/from a MultiValueMap.
• SourceHttpMessageConverter: converts to/from a javax.xml.transform.Source.

• ByteArrayHttpMessageConverter: 转换字节数组。
• StringHttpMessageConverter：转换字符串。
• FormHttpMessageConverter：将表单数据与 MultiValueMap相互转换。
• SourceHttpMessageConverter：与 javax.xml.transform.Source相互转换。

To convert the url encoded form, which is ajax.serialize() create, it's the job of FormHttpMessageConverter. Since you have a HttpMediaTypeNotSupportedExceptionexception, I guess that you didn't configure FormHttpMessageConverter. Check your spring configuration file, here is an example :

要转换 url 编码形式，即 ajax.serialize() 创建，这是FormHttpMessageConverter. 既然你有HttpMediaTypeNotSupportedException例外，我猜你没有配置FormHttpMessageConverter. 检查您的 spring 配置文件，这是一个示例：

< bean class ="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
   < property name= "messageConverters" >
         < list>
             < ref bean= "mappingHymansonHttpMessageConverter" />
             < ref bean= "stringHttpMessageConverter" /> 
             <!-- Do you have this converter ? -->
             < ref bean= "formHttpMessageConverter" />
         </ list>
    </ property>
</ bean>

回答by Douglas Ribeiro

The problem is that when we use application/x-www-form-urlencoded, Spring doesn't understand it as a RequestBody. So, if we want to use this we must remove the @RequestBodyannotation.

问题是，当我们使用application/x-www-form-urlencoded 时，Spring 不会将其理解为 RequestBody。因此，如果我们想使用它，我们必须删除@RequestBody注释。

Then try the following:

然后尝试以下操作：

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

Note that removed the annotation @RequestBody

请注意，删除了注释@RequestBody

answer: Http Post request with content type application/x-www-form-urlencoded not working in Spring

答案：内容类型为 application/x-www-form-urlencoded 的 Http Post 请求在 Spring 中不起作用