Spring MVC 文件上传下载的实例

Spring MVC 文件上传下载，具体如下：

(1) 导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。

(2) 在src/context/dispatcher.xml中添加

<bean id="multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver"

p:defaultEncoding="UTF-8" />

注意，需要在头部添加内容，添加后如下所示：

<beans default-lazy-init="true"

xmlns="http://www.springframework.org/schema/beans"

xmlns:p="http://www.springframework.org/schema/p"

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-3.0.xsd

http://www.springframework.org/schema/mvc

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

http://www.springframework.org/schema/context

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

(3) 添加工具类FileOperateUtil.java

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/**

*

* @author geloin

*/

package com.geloin.spring.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.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,

String[] params, Map<String, Object[]> values) 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("GBK");

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());

// 自定义参数值对

for (String param : params) {

map.put(param, values.get(param)[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();

}

可完全使用而不必改变该类，需要注意的是，该类中设定将上传后的文件放置在WebContent/uploadDir下。

(4) 添加FileOperateController.Java

/**

*

* @author geloin

*/

package com.geloin.spring.controller;

import java.util.HashMap;

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.web.bind.ServletRequestUtils;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.geloin.spring.util.FileOperateUtil;

@Controller

@RequestMapping(value = "background/fileOperate")

public class FileOperateController {

/**

* 到上传文件的位置

* @return

*/

@RequestMapping(value = "to_upload")

public ModelAndView toUpload() {

return new ModelAndView("background/fileOperate/upload");

}

/**

* 上传文件

*

* @param request

* @return

* @throws Exception

*/

@RequestMapping(value = "upload")

public ModelAndView upload(HttpServletRequest request) throws Exception {

Map<String, Object> map = new HashMap<String, Object>();

// 别名

String[] alaises = ServletRequestUtils.getStringParameters(request,

"alais");

String[] params = new String[] { "alais" };

Map<String, Object[]> values = new HashMap<String, Object[]>();

values.put("alais", alaises);

List<Map<String, Object>> result = FileOperateUtil.upload(request,

params, values);

map.put("result", result);

return new ModelAndView("background/fileOperate/list", map);

}

/**

* 下载

*

* @param attachment

* @param request

* @param response

* @return

* @throws Exception

*/

@RequestMapping(value = "download")

public ModelAndView 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;

}

下载方法请自行变更，若使用数据库保存上传文件的信息时，请参考Spring MVC 整合Mybatis实例。

(5) 添加fileOperate/upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE html

PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>Insert title here</title>

</head>

<body>

</body>

<form enctype="multipart/form-data"

action="<c:url value="/background/fileOperate/upload.html" />" method="post">

<input type="file" name="file1" /> <input type="text" name="alais" /><br />

<input type="file" name="file2" /> <input type="text" name="alais" /><br />

<input type="file" name="file3" /> <input type="text" name="alais" /><br />

<input type="submit" value="上传" />

</form>

</html>

确保enctype的值为multipart/form-data；method的值为post。

(6) 添加fileOperate/list.jsp

Spring MVC 文件上传下载的实例

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