GENERATE GZIP FILE AS HTTPSERVLET RESPONSE OUTPUT USING JAVA

This util method is used for increasing performance by reducing the time and output xml size. The concept is just compress the xml content and send it as a gzip file. So the file size will reduce much better and responce will be faster

public static HttpServletResponse GZipFileGenerator(
   HttpServletResponse response, String xmlString, String fileName)
   throws IOException {

  try {
   //create a temp file with gzip file extension (.gz)
   File temp = File.createTempFile(fileName, ".gz");
   //Delete the temp file on exit of the program
   temp.deleteOnExit();
   //Creating Buffered output stream contains gzip (temp) file
   BufferedOutputStream out = new BufferedOutputStream(
     new GZIPOutputStream((new FileOutputStream(temp))));
   //writing the xml to the Buffered output stream
   out.write(xmlString.getBytes("UTF-8"));
   out.close();
   //Now the gzip file is generated with xml data.
   
   //Apend the temp gzip xml file to the response.
   response.setContentType("application/gzip");
   response.setHeader("Content-Disposition",
     "attachment; filename= \"  " + fileName + ".gz \"");
   FileInputStream fileInput = new FileInputStream(temp);
   //Reading the file size and set the content to response
   int size = fileInput.available();
   response.setContentLength(size);
   byte[] filesize = new byte[size];
   OutputStream outputStream = response.getOutputStream();
   int bytesread;
   do {
    bytesread = fileInput.read(filesize, 0, size);
    if (bytesread > -1)
     outputStream.write(filesize, 0, bytesread);
   } while (bytesread > -1);
   fileInput.close();
   outputStream.flush();
   outputStream.close();
  } catch (Exception e) {

  }
  return response;
 }