Spring MVC 文件上傳下載

本文基于Spring MVC 注解，讓Spring跑起來。

? ? ? ? (1) 導入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，需要在頭部添加內容，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) 添加工具類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/";  /** * 將上傳的文件進行重命名 *  * @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;  }  /** * 壓縮后的文件名 *  * @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";  }  /** * 上傳文件 *  * @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);  // 上傳成為壓縮文件  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>();  // 固定參數值對  
                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());  // 自定義參數值對  for (String param : params) {  map.put(param, values.get(param)[i]);  }  result.add(map);  }  return result;  }  /** * 下載 *  * @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變該類，需要注意的是，該類中設定將上傳后的文件放置在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 {  /** * 到上傳文件的位置 *  * @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");  }  /** * 上傳文件 *  * @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>();  // 別名  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);  }  /** * 下載 *  * @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設計模式.zip";  String contentType = "application/octet-stream";  FileOperateUtil.download(request, response, storeName, contentType,  realName);  return null;  }  }  

下載方法請自行變更，若使用數據庫保存上傳文件的信息時，請參考Spring MVC 整合Mybatis實例。
? ? ? ? (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="上傳" />  </form>  </html>  

確保enctype的值為multipart/form-data；method的值為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) 通過http://localhost:8080/spring_test/background/fileOperate /to_upload.html訪問上傳頁面，通過http://localhost:8080/spring_test/background /fileOperate/download.html下載文件