How to compress and decompress a pdf file in java

Question

I have a PDF file ,
what i want to do is I need a lossless compression technique to compress and decompress that file,
Please help me to do so,
I am always worried about this topic

Answer 1

Here is a simple program that does the compression bit.
static void compressFile(String compressedFilePath, String filePathTobeCompressed)
          try
               ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(compressedFilePath));
               File file = new File(filePathTobeCompressed);
               int iSize = (int) file.length();
               byte[] readBuffer = new byte[iSize];
               int bytesIn = 0;
               FileInputStream fileInputStream = new FileInputStream(file);
               ZipEntry zipEntry = new ZipEntry(file.getPath());
               zipOutputStream.putNextEntry(zipEntry);
               while((bytesIn = (fileInputStream.read(readBuffer))) != -1)
                    zipOutputStream.write(readBuffer, 0, bytesIn);
               fileInputStream.close();
               zipOutputStream.close();
          catch (FileNotFoundException e)
          catch (IOException e)
               // TODO Auto-generated catch block
               e.printStackTrace();
     }