Java Bulk Compression Download

Recently did some about the volume compression download the function, the net also looked for some resources, but is not too comprehensive, therefore oneself organizes a copy, has prepared a contingency.

Directly on the code:

Get Project Path
private static String Webclass_path = Thread.CurrentThread (). Getcontextclassloader (). GetResource (""). GetPath ();
Get Webinf Path
private static String Webinf_path = webclass_path.substring (0, Webclass_path.lastindexof ("classes"));
Get Upload Path
private static String Upload_path = webinf_path.substring (0, Webinf_path.lastindexof ("Web-inf")) + "upload/";

  Public voidDownloadallfiles (httpservletrequest request, httpservletresponse response) {//gets the information for the file to be downloaded id-selected file ID concatenation of stringsString lessionidstr = Request.getparameter ("Fileids"); //filename of first fileString firstfilename = ""; List<UploadFileInfo> Downloadfiles =NewLinkedlist<uploadfileinfo>(); if(Stringutil.isnotempty (lessionidstr)) {intEnd = Lessionidstr.lastindexof (","); if(End > 0) {                if(End = = Lessionidstr.length ()-1) {Lessionidstr= lessionidstr.substring (0, end); } string[] IDs= Lessionidstr.split (",");  for(inti = 0; i < ids.length; i++) {                    //loop to get each file informationUploadfileinfo FileInfo =Uploadfileinfoservice.selectbyprimarykey (Ids[i]); if(FileInfo! =NULL) {downloadfiles.add (fileInfo); }                    if(i = = 0) {Firstfilename= Fileinfo.getfilename (). substring (0, Fileinfo.getfilename (). LastIndexOf (".")); }                }            }Else {                //loop to get each file informationUploadfileinfo FileInfo =Uploadfileinfoservice.selectbyprimarykey (LESSIONIDSTR); if(FileInfo! =NULL) {downloadfiles.add (fileInfo); } firstfilename= Fileinfo.getfilename (). substring (0, Fileinfo.getfilename (). LastIndexOf (".")); }        }                //There are data to download        if(Downloadfiles.size ()! = 0) {            //for preprocessingpreprocess (firstfilename, response); //Compression ProcessingWritezip (downloadfiles); //Download FileDownfile (response); //Delete Temporary Compressed filesafterprocess (); }    }        //compressed file output stream    PrivateZipoutputstream out; //Temporary compressed file storage path    PrivateString FilePath; /*** Description: Preprocessing * Parameters:@paramfirsefilename First file name * parameter for bulk download:@paramResponse*/    Private voidpreprocess (String firsefilename, httpservletresponse response) {//Compressed file nameString zipname = "Bulk Download" "+ Firsefilename +" and so on. zip "; FilePath= Upload_path +Zipname; Try {            //initializing the compressed file output streamout =NewZipoutputstream (NewFileOutputStream (FilePath)); //empty the output stream (the Thunder download will not appear a long channeling)Response.reset (); //set the response header and the client save file nameResponse.setcharacterencoding ("Utf-8"); Response.setcontenttype ("Multipart/form-data"); //!! New String (Zipname.getbytes ("GBK"), "8859_1") if the file contains Chinese, it must be converted, otherwise the downloaded file name is garbled formatResponse.setheader ("Content-disposition", "attachment;filename=" +NewString (Zipname.getbytes ("GBK"), "8859_1")); } Catch(IOException e) {e.printstacktrace (); }    }        /*** Description: Compression processing * Parameters:@paramdownloadfiles file data collection for bulk download*/    Private voidWritezip (list<uploadfileinfo>downloadfiles) {        byte[] buf =New byte[2048]; intLen = 0; Try {             for(Uploadfileinfo fileinfo:downloadfiles) {//Get upload fileFile File =NewFile (upload_path.substring (0, Upload_path.lastindexof ("UPLOAD")) +Fileinfo.getfilepath ()); if(!File.isfile ()) {                    Continue; }                    //Set EncodingOut.setencoding (System.getproperty ("sun.jnu.encoding")); //set the compressed file nameZipEntry ze =NewZipEntry (Fileinfo.getfilename ()); //adding to the output streamout.putnextentry (ze); //Read and output the source fileFileInputStream FIS =Newfileinputstream (file);  while(len = Fis.read (BUF))! =-1) {out.write (buf,0, Len); }                    //Refresh (must have)Out.flush ();                    Out.closeentry ();            Fis.close (); }            if(Out! =NULL) {out.close (); }        } Catch(IOException e) {e.printstacktrace (); }      }        /*** Description: Download Temporary Compressed files * Parameters:@paramResponse*/    Private voidDownfile (httpservletresponse response) {Try{File File=NewFile (FilePath); if(File.exists ()) {InputStream ins=NewFileInputStream (FilePath); //put it inside the buffer stream .Bufferedinputstream bins =Newbufferedinputstream (INS); //get file output io streamOutputStream outs =Response.getoutputstream (); Bufferedoutputstream Bouts=NewBufferedoutputstream (outs); intBytesread = 0; byte[] buffer =New byte[1024]; //start transferring file streams to the network                 while((bytesread = bins.read (buffer))! =-1) {bouts.write (buffer,0, Bytesread); }                //Be sure to call the Flush () method hereBouts.flush ();                Ins.close ();                Bins.close ();                Outs.close ();            Bouts.close (); }        } Catch(IOException e) {logger.error ("File Download Error", E); }       }        /*** Description: Delete Temporary compressed files*/    Private voidafterprocess () {//Delete source FilesFile tempzip=NewFile (FilePath); if(Tempzip.exists ()) {tempzip.delete (); }    }    

Java Bulk Compression Download