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在實際開發中，經常遇到要實現文件上傳到服務器端的功能。Spring可以繼承commons-fileupload插件來實現文件上傳的功能。分為前端JSP編寫和后臺Controller的編寫。

前期準備工作，首先要引入commons-fileupload這個jar包，pom.xml中的配置如下：

復制代碼代碼如下:

	
	<!-- 實現文件上傳，spring集成了這個功能 -->

	<dependency>

	 <groupId>commons-fileupload</groupId>

	 <artifactId>commons-fileupload</artifactId>

	 <version>1.2.2</version>

	</dependency>

然后配置攔截器，在dispatcher-servlet.xml中添加

復制代碼代碼如下:

	
	<!-- 實現文件上傳，這樣一旦某個Request是一個MultipartRequest，它就會首先被MultipartResolver處理，然后再轉發相應的Controller -->

	<bean id="multipartResolver"

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

	 <!-- 設置上傳文件的最大尺寸為1MB -->

	 <property name="maxUploadSize">

	  <value>1048576</value>

	 </property>

	</bean>

直接上代碼：

1、前端JSP編寫

upload.jsp

復制代碼代碼如下:

	
	<%@ page language="java" pageEncoding="UTF-8"%>

	<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

	<html>

	 <head>

	  <script src="resources/js/jquery.js"></script>

	 </head>

	 <body>

	  <form method="post" action="upload.do" enctype="multipart/form-data">

	   <input type="file" name="file" />

	   <input type="submit" />

	  </form>

	 </body>

	</html>

2、后臺UploadController編寫

復制代碼代碼如下:

package nju.software.xkxt.web.controller;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**
* @author typ
*
*/
@Controller
public class UploadController {

/**
* 進入下載界面
*
* @param request
* @param response
* @param model
* @return
* @throws IOException
*/
@RequestMapping(value = "upload_enter.do", method = RequestMethod.GET)
public String enter(HttpServletRequest request,
   HttpServletResponse response, ModelMap model) throws IOException {
  // 進入下載界面
  return "upload";

}

/**
* 具體的實現下載功能
*
* @param request
* @param response
* @param model
* @throws IOException
*/
@RequestMapping(value = "upload.do", method = RequestMethod.POST)
public void upload(HttpServletRequest request,
   HttpServletResponse response, ModelMap model) throws IOException {
  MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
  // 得到上傳的文件
  MultipartFile mFile = multipartRequest.getFile("file");
  // 得到上傳服務器的路徑
  String path = request.getSession().getServletContext()
    .getRealPath("/WEB-INF/upload/");
  // 得到上傳的文件的文件名
  String filename = mFile.getOriginalFilename();
  InputStream inputStream = mFile.getInputStream();
  byte[] b = new byte[1048576];
  int length = inputStream.read(b);
  path += "\\" + filename;
  // 文件流寫到服務器端
  FileOutputStream outputStream = new FileOutputStream(path);
  outputStream.write(b, 0, length);
  inputStream.close();
  outputStream.close();
}
}