Spring mvc：HTTP状态400 - 所需的MultipartFile参数“文件”不存在

问题描述

这是我的控制器：

pre $ @ $ c $ @RequestMapping（value =/ admin / users / photo，method = RequestMethod。 POST）
public ModelAndView editUser（@RequestParam（file）MultipartFile文件，
Principal主体）{
//代码永远不会到达
}

我的mvc-dispatcher-servlet.xml

 < bean id =multipartResolver
 class =org.springframework.web.multipart.support.StandardServletMultipartResolver> 
< / bean> 
  

pom.xml：

 <依赖项> 
< groupId> commons-fileupload< / groupId> 
< artifactId> commons-fileupload< / artifactId> 
< version> 1.3.1< / version> 
< /依赖> 
  

表格本身：

 < form action =$ {pageContext.request.contextPath}
 method =POST
 enctype =multipart / form-data> 
< input type =file
 name =file
 /> 
< input type =submitvalue =添加> 
< / form> 
  

这就是浏览器所说的：

如何解决这个问题？

解决方案

您可以尝试使用这个

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

而不是

 < bean id =multipartResolver
 class =org.springframework.web.multipart.support.StandardServletMultipartResolver> 
  

This is my controller:

@RequestMapping(value = "/admin/users/photo", method = RequestMethod.POST)
public ModelAndView editUser(@RequestParam("file") MultipartFile file,
                             Principal principal) {
    // code never gets here
}

my mvc-dispatcher-servlet.xml

<bean id="multipartResolver"
      class="org.springframework.web.multipart.support.StandardServletMultipartResolver">
</bean>

pom.xml:

    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>

form itself:

<form action="${pageContext.request.contextPath}"
      method="POST"
      enctype="multipart/form-data">
        <input type="file"
        name="file"
        />
    <input type="submit" value="Добавить">
</form>

This is what browser says:

How to fix that?

解决方案

You can try to use this

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

instead of

<bean id="multipartResolver"
      class="org.springframework.web.multipart.support.StandardServletMultipartResolver">

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