我正在尝试添加将图片上传到我的Spring MVC应用程序的功能。

jsp部分：

...
<form method="POST"  action="uploadImage" enctype="multipart/form-data">
                <div class="load-line">
                    <input type="file" class="file"/>
                    <input type="submit" value="Upload">
...

组态：

... 
<bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />
...

控制器：

 @RequestMapping(value="/member/createCompany/uploadImage", method=RequestMethod.POST)
    public @ResponseBody String handleFileUpload(
            @RequestParam("file") MultipartFile file){
        String name = "image_name";
        if (!file.isEmpty()) {
            try {
                byte[] bytes = file.getBytes();
                BufferedOutputStream stream =
                        new BufferedOutputStream(new FileOutputStream(new File(name + "-uploaded")));
                stream.write(bytes);
                stream.close();
                return "You successfully uploaded " + name + " into " + name + "-uploaded !";
            } catch (Exception e) {
                return "You failed to upload " + name + " => " + e.getMessage();
            }
        } else {
            return "You failed to upload " + name + " because the file was empty.";
        }
    }

选择图片后，单击“上传”，然后看到错误消息：

HTTP Status 400 - Required MultipartFile parameter 'file' is not present

我怎么了