ZipInputStream & ZipEntry taking time to unzip big file

Question

Hi,
We have big zip file around 2GB which needs to downloaded and unzipped. We are using ZipInputStream & ZipEntry for unzipping the files.
This is taking around 45 min to unzip the file. Do we have better alternative for doing the same?
Thanks in advance
Regards,
Ravi

Answer 1

Below is the code we are using:
public void getZipFiles(String sSourcePath, String sDestPath)
        try
            sDestPath = sDestPath + Util.getFileSeparator();
            byte[] buf = new byte[1024];
            ZipInputStream zipinputstream = null;
            ZipEntry zipentry;
            BufferedOutputStream  outBuffer =null;
            BufferedInputStream inBuffer = null;
            zipinputstream = new ZipInputStream(
                new FileInputStream(sSourcePath));
            String sFile =sSourcePath.substring(0,  sSourcePath.indexOf("."));
        File f = new File(sFile);
        if(f.mkdir())
            System.out.println( f + " Directory Created");
        else
        System.out.println(f + " Directory is not created");
            zipentry = zipinputstream.getNextEntry();
            while (zipentry != null)
                //for each entry to be extracted
                String entryName = zipentry.getName();
                int n;
                if(zipentry.isDirectory())
                    File f1 = new File(sDestPath+zipentry.getName());
                     if(f1.mkdir())
                            System.out.println(f + " Directory Created");
                        else
                        System.out.println(f + " Directory is not created");
                else
                FileOutputStream fileoutputstream;
                File newFile = new File(entryName);
                String directory = newFile.getParent();
                if(directory == null)
                    if(newFile.isDirectory())
                        break;
                fileoutputstream = new FileOutputStream(sDestPath+entryName);
                outBuffer = new BufferedOutputStream(fileoutputstream);
                inBuffer = new BufferedInputStream(zipinputstream);
               /* while ((n = zipinputstream.read(buf, 0, 1024)) > -1)
                    fileoutputstream.write(buf, 0, n);*/
                while(true){
                   int bytedata = inBuffer.read();
                  if(bytedata == -1)       break;
                  outBuffer.write(bytedata);
                outBuffer.flush();
                fileoutputstream.close();
                fileoutputstream.flush();
               // zipinputstream.closeEntry();
                zipentry = zipinputstream.getNextEntry();
            }//while
            zipinputstream.close();
            outBuffer.close();
            inBuffer.close();
        catch (Exception e)
            e.printStackTrace();
    }Edited by: EJP on 5/02/2013 22:07: code tags