获取HTTP状态400 - 所需的MultipartFile参数“文件”在春天不存在 [英] Geting HTTP Status 400 - Required MultipartFile parameter 'file' is not present in spring

问题描述

我试图用 spring 来上传文件。下面是我的代码我是如何工作
，但如果我尝试使用它，我得到这个响应：

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

我没有得到错误信息。

我使用高级休息客户端进行测试，并将文件作为附件上传。

我的Java代码：

  @RequestMapping（value =/ upload，headers =Content-Type = multipart / form-data，method = RequestMethod.POST）
 @ ResponseBody 
 public String upload（@RequestParam（file）MultipartFile file）
 {
 String name =test.xlsx; 
 if（！file.isEmpty（））{
 try {
 byte [] bytes = file.getBytes（）; 
 BufferedOutputStream stream = 
 new BufferedOutputStream（new FileOutputStream（new File（name）））; 
 stream.write（bytes）; 
 stream.close（）; 
返回您成功上传+ name +！; 
} 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 +。 
 
 
 $ / code> 




解决方案

需要



< bean id =multipartResolverclass =org.springframework.web.multipart.commons.CommonsMultipartResolver/>

bean来处理文件上传。

$ b 您应该在应用程序上下文文件中注册这个bean。

内容类型也应该是有效的。在你的情况 enctype =multipart / form-data

EDIT1：

您可以将上传和内存大小赋予bean属性：

 < bean id =multipartResolver
 class =org.springframework.web.multipart.commons.CommonsMultipartResolver> 
<！ - 最大上传大小（以字节为单位） - > 
< property name =maxUploadSizevalue =20971520/> <！ -  20MB  - > 
 
<！ - 内存中文件的最大大小（以字节为单位） - > 
< property name =maxInMemorySizevalue =1048576/> <！ -  1MB  - > 
 
< / bean> 
  

I am trying to upload a file using spring. Below is my code how I am working on it but if I try to use it I am getting this response:

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

I dont get what the error is.

I am using advanced rest client for testing and I am uploading file as an attachment.

My Javacode:

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

解决方案

Spring needs the

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

bean to handle file-uploads.

You should register this bean in your application context file.

The Content-Type should also be valid. In your case enctype="multipart/form-data"

EDIT1:

You can give the upload and memory size to the bean properties:

  <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- max upload size in bytes -->
        <property name="maxUploadSize" value="20971520" /> <!-- 20MB -->

        <!-- max size of file in memory (in bytes) -->
        <property name="maxInMemorySize" value="1048576" /> <!-- 1MB -->

    </bean>

这篇关于获取HTTP状态400 - 所需的MultipartFile参数“文件”在春天不存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！