springmvc文件上传下载

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