java - Spring Controller 获取空对象

Question

我通过 jsp 表单向 spring Controller 发送一个对象。

JSP:

<form:form modelAttribute="uploadItem" action="/uploadObject" method="post" enctype="multipart/form-data">

<form:input path="fileData" accept="audio/mpeg" type="file" id="file-upload" name="file-upload" />

<form:input type="text" path="title" id="upload-title" name="upload-title"/>

<input type="image" src="..." alt="Upload"/>

</form:form>

模型服务:

 public void fillUploadMelodyModel(Model model) {
    fillAdminRootModel(model);
    model.addAttribute("uploadItem", new UploadedItem());
}

上传的项目:

public class UploadedItem {
  private CommonsMultipartFile fileData;
  private String title;
}

Controller :

 @RequestMapping(value = "/uploadObject", method = RequestMethod.POST)
    public String doUpload(UploadedItem uploadItem, BindingResult result, Principal principal) {
//at this point I get an empty object (null null values)
}

有什么问题吗？如何在jsp中将对象传递给 Controller ​​？

Answer 1

尝试像这样更改你的 Controller

@RequestMapping(value = "/uploadObject", method = RequestMethod.POST)
public String doUpload(UploadedItem uploadItem, 
                      BindingResult result, 
                      @RequestParam("fileData") MultipartFile file,
                      @RequestParam("title") String title,
                      Principal principal) {
//Here you should receive your parameters
}