Javaweb file Pack bulk download code _java

This example for you to share the Javaweb file packaging bulk download for your reference, the specific content as follows

Bulk download @RequestMapping (value = "/downloadallhomework", method = Requestmethod.get) is not corrected for the job and public void Downloadallhomewor K (HttpSession HttpSession, httpservletrequest request, httpservletresponse response, String assignmentid, int classcode
  ) throws Exception {Site site = (site) httpsession.getattribute ("site");

  String SiteID = Site.getid ();
  Get job details based on job ID assignmentdetail assignmentdetail = assignmentservicews.getassignmentdetail (AssignmentID);

  Generateparameters (Assignmentdetail);
  The information is incomplete and needs to be populated later. list<assignmentsubmit> assignmentsubmitlist = assignmentservicews.getsubmitedassignmentstudent (AssignmentID

  );
  Get all the 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); //Get submit details list<assignmentsubmit> assignmentsubmits = new Arraylist<assignmentsubmit> ();
   for (String a:submitids) {Assignmentsubmit as = Assignmentservicews.getsubmitassignment (a);
  Assignmentsubmits.add (AS); //To each student who has submitted a job with a map,username-->assignmentsubmit map<string, assignmentsubmit> studentsubmitmap = new HashM
  Ap<string, assignmentsubmit> ();
   for (Assignmentsubmit assignmentsubmit:assignmentsubmits) {String StudentID = Assignmentsubmit.getusername ();
  Studentsubmitmap.put (StudentID, assignmentsubmit); ///According to the class number, get the student number of all the students in the class, and then get the details list list<assignmentsubmit> assignmentstudentlist = new Arraylist<assignmentsub

  Mit> ();
  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 ()!= n
  ull) 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 ()//create file output stream FileOutputStream fous = new FileOutputStream (file);
  Packaging method We will use zipoutputstream such an output stream, so here we convert the output stream zipoutputstream zipout = new Zipoutputstream (fous); for (Assignmentsubmit a:submitedlist) {for (Attachids aa:a.getattachids ()) {try {String Fileid = aa.ge
     TId (); 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 ();
     Gets the file name of the remote file. Response.AddHeader ("Content-disposition", "attachment;filename=" +//New String (Filename.getbytes ("GBK"), "iso-88
     59-1 "));
     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); ///To compress all the accepted files into a compressed package public static HttpServletResponse downloadzip (file file, httpservletresponse response) {try {/
   /Download the file as a streaming form.
   InputStream fis = new Bufferedinputstream (New FileInputStream (File.getpath ()));
   byte[] buffer = new byte[fis.available ()];
   Fis.read (buffer);
   Fis.close ();
   Empty response Response.reset ();
   OutputStream toclient = new Bufferedoutputstream (Response.getoutputstream ());

   Response.setcontenttype ("Application/octet-stream"); If the output is the Chinese name of the file, here you will use the Urlencoder.encode method for processing 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;

 }

Blog address! http://oldriver.top/Old Driver Technical Handbook

The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.