所需的MultipartFile参数'文件'在春天mvc不存在 [英] Required MultipartFile parameter 'file' is not present in spring mvc

问题描述

jsp部分：

 ... 
 
< div class =load-line> 
< input type =fileclass =file/> 
< input type =submitvalue =上传> 
 ... 
  

配置：

  ... 
  class =org.springframework.web.multipart.commons.CommonsMultipartResolver/> 
 ... 
  

控制器：

（
@RequestParam（pre $文件）MultipartFile文件）{
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您成功上传了+ name +into+ name +-uploaded！;
} catch（Exception e）{
return您上传失败+ name +=>+ e.getMessage（）;
}
} else {
return由于文件是空的，因此您无法上传+ name +。






$ p

当我选择了图片后，点击上传并查看错误信息：

  HTTP状态400  - 所需的MultipartFile参数'file'不存在
  

我错了什么？

解决方案

指定了名称属性， @RequestParam（textFile） 需要名称

 < input type =fileclass =filename =textFile/> 
  

I am trying to add feature of uploading picture to my spring mvc application.

jsp part:

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

configuration:

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

controller:

 @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.";
        }
    }

After I selected picture I click upload and see error message:

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

What do I wrong?

解决方案

You have not specified the name attribute , @RequestParam("textFile") requires name ,

 <input type="file" class="file" name="textFile"/>

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