javaweb文件打包批量下载代码

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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