Spring MVC 文件上传与下载

需要的jar包：commons-io-1.3.2.jar、ant.jar、commons-fileupload-1.2.jar（Spring核心包里有）

Spring mvc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/mvc
              http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
              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">

	<!-- 扫描所有的 controller -->
	<context:component-scan base-package="com.Controllers" />

	<!-- 启动注解驱动 SpringMVC 功能 -->
	<mvc:annotation-driven />

	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/" />
		<property name="suffix" value=".jsp" />
	</bean>
	
	<!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 默认编码 -->
		<property name="defaultEncoding" value="utf-8" />
		<!-- 文件大小最大值 -->
		<property name="maxUploadSize" value="10485760000" />
		<!-- 内存中的最大值 -->
		<property name="maxInMemorySize" value="40960" />
	</bean>
	
</beans>

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"
	id="WebApp_ID" version="3.1">
	<display-name>Spring MVC</display-name>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	</servlet>

	<servlet-mapping>
		<servlet-name>springmvc</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

FileOperateUtil.java

package com.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

public class FileOperateUtil {
	private static final String REALNAME = "realName";
	private static final String STORENAME = "storeName";
	private static final String SIZE = "size";
	private static final String SUFFIX = "suffix";
	private static final String CONTENTTYPE = "contentType";
	private static final String CREATETIME = "createTime";
	private static final String UPLOADDIR = "uploadDir/";

	/**
	 * 将上传的文件进行重命名
	 * 
	 * @param name
	 * @return
	 */
	private static String rename(String name) {

		Long now = Long.parseLong(new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()));
		Long random = (long) (Math.random() * now);
		String fileName = now + "" + random;

		if (name.indexOf(".") != -1) {
			fileName += name.substring(name.lastIndexOf("."));
		}

		return fileName;
	}

	/**
	 * 压缩后的文件名
	 * 
	 * @param name
	 * @return
	 */
	private static String zipName(String name) {
		String prefix = "";
		if (name.indexOf(".") != -1) {
			prefix = name.substring(0, name.lastIndexOf("."));
		} else {
			prefix = name;
		}
		return prefix + ".zip";
	}

	/**
	 * 上传文件
	 * 
	 * @param request
	 * @param params
	 * @param values
	 * @return
	 * @throws Exception
	 */
	public static List<Map<String, Object>> upload(HttpServletRequest request) throws Exception {

		List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();

		MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;
		Map<String, MultipartFile> fileMap = mRequest.getFileMap();

		String uploadDir = request.getSession().getServletContext().getRealPath("/") + FileOperateUtil.UPLOADDIR;
		File file = new File(uploadDir);

		if (!file.exists()) {
			file.mkdir();
		}

		String fileName = null;
		int i = 0;
		for (Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet().iterator(); it.hasNext(); i++) {

			Map.Entry<String, MultipartFile> entry = it.next();
			MultipartFile mFile = entry.getValue();

			fileName = mFile.getOriginalFilename();
			String storeName = rename(fileName);
			String noZipName = uploadDir + storeName;
			String zipName = zipName(noZipName);
			// 上传成为压缩文件
			ZipOutputStream outputStream = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipName)));
			outputStream.putNextEntry(new ZipEntry(fileName));
			outputStream.setEncoding("utf-8");
			
			//非压缩
			//BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(uploadDir+""+fileName));
			//FileCopyUtils.copy(mFile.getInputStream(), out);
			FileCopyUtils.copy(mFile.getInputStream(), outputStream);

			Map<String, Object> map = new HashMap<String, Object>();
			// 固定参数值对
			map.put(FileOperateUtil.REALNAME, zipName(fileName));
			map.put(FileOperateUtil.STORENAME, zipName(storeName));
			map.put(FileOperateUtil.SIZE, new File(zipName).length());
			map.put(FileOperateUtil.SUFFIX, "zip");
			map.put(FileOperateUtil.CONTENTTYPE, "application/octet-stream");
			map.put(FileOperateUtil.CREATETIME, new Date());
			map.put("alais", ServletRequestUtils.getStringParameters(request, "alais")[i]);

			result.add(map);
		}
		return result;
	}

	/**
	 * 下载
	 * 
	 * @param request
	 * @param response
	 * @param storeName
	 * @param contentType
	 * @param realName
	 * @throws Exception
	 */
	public static void download(HttpServletRequest request, HttpServletResponse response, String storeName,
			String contentType, String realName) throws Exception {
		response.setContentType("text/html;charset=UTF-8");
		request.setCharacterEncoding("UTF-8");
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;

		String ctxPath = request.getSession().getServletContext().getRealPath("/") + FileOperateUtil.UPLOADDIR;
		String downLoadPath = ctxPath + storeName;

		long fileLength = new File(downLoadPath).length();

		response.setContentType(contentType);
		response.setHeader("Content-disposition",
				"attachment; filename=" + new String(realName.getBytes("utf-8"), "ISO8859-1"));
		response.setHeader("Content-Length", String.valueOf(fileLength));

		bis = new BufferedInputStream(new FileInputStream(downLoadPath));
		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);
		}
		bis.close();
		bos.close();
	}
}

MyController.java

package com.Controllers;

import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import com.util.FileOperateUtil;

@Controller
public class MyController {

	
	@RequestMapping(value = "upload")
	public String upload(HttpServletRequest request,Model model) throws Exception {

		//返回上传文件的名称
		List<Map<String, Object>> result = FileOperateUtil.upload(request);
		model.addAttribute("result", result);

		return "second";
	}

	/**
	 * 下载
	 * 
	 * @param attachment
	 * @param request
	 * @param response
	 * @return
	 * @throws Exception
	 */
	@RequestMapping(value = "download")
	public String download(HttpServletRequest request, HttpServletResponse response) throws Exception {

		String storeName = "201205051340364510870879724.zip";
		String realName = "Java设计模式.zip";
		String contentType = "application/octet-stream";

		FileOperateUtil.download(request, response, storeName, contentType, realName);

		return null;
	}
}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
</head>

<body>
	<form enctype="multipart/form-data" action="upload" method="post">
		<input type="file" name="file1" /> <input type="file" name="file2" />
		<input type="file" name="file3" /> <input type="submit" value="上传" />
	</form>
</body>
</html>

second.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'second.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <c:forEach items="${result }" var="item">  
        <c:forEach items="${item }" var="m">  
            <c:if test="${m.key eq 'realName' }">  
                ${m.value }  
            </c:if>  
            <br />  
        </c:forEach>  
    </c:forEach>
    <a href="download">DownLoad</a>
  </body>
</html>