本文实例为大家分享了javaweb文件打包批量下载，供大家参考，具体内容如下
// 批量下载未批改作业 @RequestMapping(value = "/downloadAllHomework", method = RequestMethod.GET) public void downloadAllHomework(HttpSession httpSession, HttpServletRequest request, HttpServletResponse response, String assignmentid, int classCode) throws Exception { Site site = (Site) httpSession.getAttribute("site"); String siteid = site.getId(); // 根据作业ID获取作业详细信息 AssignmentDetail assignmentDetail = assignmentServiceWS.getAssignmentDetail(assignmentid); generateParameters(assignmentDetail); // 信息不完整，后面需要填充。 List<AssignmentSubmit> assignmentSubmitList = assignmentServiceWS.getSubmitedAssignmentStudent(assignmentid); // 获取所有的submitid List<String> submitids = new ArrayList<String>(); for (int i = 0; i < assignmentSubmitList.size(); i++) { String submitid = assignmentSubmitList.get(i).getId(); if (submitid == null || submitid == "") continue; submitids.add(submitid); } // 获取提交详情 List<AssignmentSubmit> assignmentSubmits = new ArrayList<AssignmentSubmit>(); for (String a : submitids) { AssignmentSubmit as = assignmentServiceWS.getSubmitAssignment(a); assignmentSubmits.add(as); } // 给每个已提交作业的学生配一个map，userName-->AssignmentSubmit Map<String, AssignmentSubmit> studentSubmitMap = new HashMap<String, AssignmentSubmit>(); for (AssignmentSubmit assignmentSubmit : assignmentSubmits) { String studentID = assignmentSubmit.getUserName(); studentSubmitMap.put(studentID, assignmentSubmit); } // 根据班级号获取该班所有学生的学号，再根据学号获取详情列表 List<AssignmentSubmit> assignmentStudentList = new ArrayList<AssignmentSubmit>(); List<MemberVO> studentList = memberServiceWS.getStudents(siteid, classCode); for (MemberVO student : studentList) { String userName = student.getId(); String realName = student.getName(); AssignmentSubmit assignmentSubmit = new AssignmentSubmit(); if (studentSubmitMap.get(userName) != null) { assignmentSubmit = studentSubmitMap.get(userName); } assignmentSubmit.setRealName(realName); assignmentSubmit.setUserName(userName); generateA(assignmentSubmit); assignmentStudentList.add(assignmentSubmit); } List<AssignmentSubmit> submitedList = new ArrayList<AssignmentSubmit>(); for (AssignmentSubmit as : assignmentStudentList) { if (as.getGradePoint() == null && as.getAssignmentID() != null) submitedList.add(as); } List<File> files = new ArrayList<File>(); File file = new File("d:/css.rar"); if (!file.exists()) { file.createNewFile(); } response.reset(); // response.getWriter() // 创建文件输出流 FileOutputStream fous = new FileOutputStream(file); // 打包的方法我们会用到ZipOutputStream这样一个输出流, 所以这里我们把输出流转换一下 ZipOutputStream zipOut = new ZipOutputStream(fous); for (AssignmentSubmit a : submitedList) { for (AttachIDs aa : a.getAttachIDs()) { try { String fileId = aa.getId(); String cloudFileUrl = "http://xxx.xxx.xxx.xxx:8066/ImageService/DownloadFile/"; String fileUrl = announceService.getAttachmentByFileid(fileId).getUrlUpload(); fileUrl = fileUrl.substring(fileUrl.lastIndexOf("/") + 1); fileUrl = cloudFileUrl + fileUrl; String fileName = announceService.getAttachmentByFileid(fileId).getName(); // 获取远程文件的文件名。 // response.addHeader("Content-Disposition", "attachment;filename=" + // new String(fileName.getBytes("gbk"), "iso-8859-1")); // iso-8859-1 ZipEntry entry = new ZipEntry(new String(fileName.getBytes("gbk"), "iso-8859-1")); zipOut.putNextEntry(entry); URL urlfile = null; HttpURLConnection httpUrl = null; urlfile = new URL(fileUrl); httpUrl = (HttpURLConnection) urlfile.openConnection(); httpUrl.connect(); InputStream downloadFile = httpUrl.getInputStream(); int len = 0; byte[] buf = new byte[1024]; while ((len = downloadFile.read(buf, 0, 1024)) != -1) { zipOut.write(buf, 0, len); } } catch (JSONException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } } zipOut.close(); fous.close(); downloadZip(file, response); } // 把接受的全部文件打成压缩包 public static HttpServletResponse downloadZip(File file, HttpServletResponse response) { try { // 以流的形式下载文件。 InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath())); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); // 清空response response.reset(); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); // 如果输出的是中文名的文件，在此处就要用URLEncoder.encode方法进行处理 response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(file.getName(), "UTF-8")); toClient.write(buffer); toClient.flush(); toClient.close(); } catch (IOException ex) { ex.printStackTrace(); } finally { try { File f = new File(file.getPath()); f.delete(); } catch (Exception e) { e.printStackTrace(); } } return response; }
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