在网上搜索的代码 参考整理了一份

需要使用的jar、

commons-fileupload.jar与commons-io-1.4.jar二个文件 1、表单属性为: enctype="multipart/form-data"

2、springmvc配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-3.2.xsd
  http://www.springframework.org/schema/mvc
  http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
  
  
<!-- 扫描包 -->
<context:component-scan base-package="com.ai.customer" />

 <!-- 启动注解 -->
 <mvc:annotation-driven />


<!-- 文件上传 -->
 <bean id="multipartResolver"  
   class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
   <!-- 设置上传文件的最大尺寸为10MB -->  
   <property name="maxUploadSize">  
       <value>10000000</value>  
   </property>  
  </bean>  


<!--  静态文件访问 -->
 <mvc:default-servlet-handler/> 
 <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 --> 
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
 
 	<property name="prefix" value="/"/>
 	<property name="suffix" value=".jsp"/>	
 </bean> 
 
</beans>

2、上传下载功能代码

package com.ai.customer.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class FileUploadController {

  /*
   * SpringMVC中的文件上传
   * @第一步：由于SpringMVC使用的是commons-fileupload实现，故将其组件引入项目中
   * @这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar
   * @第二步：spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制
   *  <bean id="multipartResolver"  
   *  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
   *	 <!-- 设置上传文件的最大尺寸为10MB -->  
   *		<property name="maxUploadSize">  
   *			<value>10000000</value>  
   *		 </property>  
   * </bean> 
   * 第三步：在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容
   *第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/>
   *  如果是单个文件 直接使用MultipartFile 即可
   */ 

  @RequestMapping("/upload.do")
  public ModelAndView upload(String name,
      //上传多个文件
      @RequestParam("file") MultipartFile[] file,
      HttpServletRequest request) throws IllegalStateException,
      IOException {
    
    //获取文件 存储位置
    String realPath = request.getSession().getServletContext()
        .getRealPath("/uploadFile");
    
    File pathFile = new File(realPath);
    
    if (!pathFile.exists()) {
      //文件夹不存 创建文件
      pathFile.mkdirs();
    }
    for (MultipartFile f : file) {
      
      System.out.println("文件类型："+f.getContentType());
      System.out.println("文件名称："+f.getOriginalFilename());
      System.out.println("文件大小:"+f.getSize());
      System.out.println(".................................................");
      //将文件copy上传到服务器
      f.transferTo(new File(realPath + "/" + f.getOriginalFilename()));
       //FileUtils.copy
    }
    //获取modelandview对象
    ModelAndView view = new ModelAndView();
    view.setViewName("redirect:index.jsp");
    return view;
  }
  
  
  @RequestMapping(value = "download.do")  
  public ModelAndView download(HttpServletRequest request,  
      HttpServletResponse response) throws Exception {  
  
//		String storeName = "Spring3.xAPI_zh.chm";  
    String storeName="房地.txt";
    String contentType = "application/octet-stream";  
    FileUploadController.download(request, response, storeName, contentType);  
    return null;  
  }  
  
  
  //文件下载 主要方法
  public static void download(HttpServletRequest request,  
      HttpServletResponse response, String storeName, String contentType
       ) throws Exception {  
    
    request.setCharacterEncoding("UTF-8");  
    BufferedInputStream bis = null;  
    BufferedOutputStream bos = null;  
  
    //获取项目根目录
    String ctxPath = request.getSession().getServletContext()  
        .getRealPath("");  
    
    //获取下载文件露肩
    String downLoadPath = ctxPath+"/uploadFile/"+ storeName;  
  
    //获取文件的长度
    long fileLength = new File(downLoadPath).length();  

    //设置文件输出类型
    response.setContentType("application/octet-stream");  
    response.setHeader("Content-disposition", "attachment; filename="  
        + new String(storeName.getBytes("utf-8"), "ISO8859-1")); 
    //设置输出长度
    response.setHeader("Content-Length", String.valueOf(fileLength));  
    //获取输入流
    bis = new BufferedInputStream(new FileInputStream(downLoadPath));  
    //输出流
    bos = new BufferedOutputStream(response.getOutputStream());  
    byte[] buff = new byte[2048];  
    int bytesRead;  
    while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {  
      bos.write(buff, 0, bytesRead);  
    }  
    //关闭流
    bis.close();  
    bos.close();  
  }  
   
}

3、上传页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
  pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>


</head>
<body>


  <form action="upload.do" method="post" enctype="multipart/form-data">
  
    <input type="text" name="name" />
    <br>
    <input type="file" name="file">
    <br>
    <input type="file" name="file" />
    
    <input type="submit" value="提交">
  </form>


</body>
</html>

4、下载直接访问控制器如：http:\\localhost:8080/springmvc/download.do