Spring MVC：上传文件时“客户端发送的请求在语法上不正确”？答案

【问题标题】：Spring MVC : "The request sent by the client was syntactically incorrect" when uploading a file?Spring MVC：上传文件时“客户端发送的请求在语法上不正确”？
【发布时间】：2016-12-17 19:06:54
【问题描述】：

我正在尝试通过 Spring MVC 上传文件，但一直收到 HTTP 400 - The request sent by the client was syntaxly wrong 错误。以下是我的设置：

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
  <display-name>FileUploader</display-name>
  <servlet>
    <servlet-name>FileUploader</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>FileUploader</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

FileUploader-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <context:component-scan base-package="com.fileuploader"/>
   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/JSP/"/>
        <property name="suffix" value=".jsp"/>
   </bean>
</beans>

FileUploadController.java

package com.fileuploader;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/files")
public class FileUploaderController {

    @RequestMapping(value = "/selectFile", method = RequestMethod.GET)
    public String selectFile()
    {
        return "selectFile";
    }

    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
    public String uploadFile(@RequestParam("file") MultipartFile fileUpload)
    {
        //System.out.println(file.getOriginalFilename());
        return "uploadSuccessful";
    }
}

还有两个JSP视图，selectFile.jsp和uploadSuccessful.jsp

<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Upload File</title>
</head>
<body>
    <h1>Upload Your File Here</h1>

    <form action="/FileUploader/files/uploadFile" method="POST" enctype="multipart/form-data">
        <table>
            <tr>
                <td>Select a file to upload : <input type="file" name="file"/></td>
            </tr>
            <tr>
                <td><input type="submit" value="Upload"/></td>
            </tr>
        </table>
    </form>
</body>
</html>

uploadSuccessful.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Upload Successful</title>
</head>
<body>
<h1>Upload Successful</h1>
</body>
</html>

什么可能导致这个错误？谢谢你的帮助。

【问题讨论】：

我猜在上传文件 jsp 中，您应该使用 Spring url 进行表单操作，这可能是问题所在。由于您使用的是 Spring form taglib

标签： java spring jsp spring-mvc file-upload

【解决方案1】：

我需要将以下配置添加到我的FileUploader-servlet.xml：

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

【讨论】：