javaweb文件打包批量下载

  // 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;

  }