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">

&l
4000
t;!-- 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>