Spring MVC 文件上传下载
(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
/** * * @author geloin * @date 2012-5-5 下午12:05:57 */ 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; /** * * @author geloin * @date 2012-5-5 下午12:05:57 */ 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 * * @author geloin * @date 2012-3-29 下午3:39:53 * @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 * * @author geloin * @date 2012-3-29 下午6:21:32 * @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 * * @author geloin * @date 2012-5-5 下午12:25:47 * @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 * * @author geloin * @date 2012-5-5 下午12:25:39 * @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 * @date 2012-5-5 上午11:56:35 */ 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; /** * * @author geloin * @date 2012-5-5 上午11:56:35 */ @Controller @RequestMapping(value = "background/fileOperate") public class FileOperateController { /** * 到上传文件的位置 * * @author geloin * @date 2012-3-29 下午4:01:31 * @return */ @RequestMapping(value = "to_upload") public ModelAndView toUpload() { return new ModelAndView("background/fileOperate/upload"); } /** * 上传文件 * * @author geloin * @date 2012-3-29 下午4:01:41 * @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 * * @author geloin * @date 2012-3-29 下午5:24:14 * @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
<%@ 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> <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> </body> </html>
(7) 通过http://localhost:8080/spring_test/background/fileOperate /to_upload.html访问上传页面，通过http://localhost:8080/spring_test/background /fileOperate/download.html下载文件
