SpringMVC上传下载

springmvc上传下载功能 参照网上代码写了一个简单的例子

1、需要导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。当然spring jar包不可缺少的哦  我这里用的是spring+springmvc+hibernate  可以到官网上直接下载springmvcjar即可

2、springmvc.xml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>

3、web.xml配置

<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath*:config/spring/spring-*.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
<filter>
    <filter-name>codeUTF-8</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>codeUTF-8</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

4、程序代码块

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
	 */ 

	/**********************上传代码**************************/
	@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;
	}

	/********下载代码*************/
    @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();
    }  

}

5、jsp页面代码 注意：设置表单中form表单的属性为：enctype="multipart/form-data"

<%@ 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>