Compressing a File : GZIP « File Input Output « Java

1. Java
2. File Input Output
3. GZIP

Compressing a File

  
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.zip.GZIPOutputStream;

public class CompressIt {
  public static void main(String[] args) {
    String filename = args[0];
    try {
      File file = new File(filename);
      int length = (int) file.length();
      FileInputStream fis = new FileInputStream(file);
      BufferedInputStream bis = new BufferedInputStream(fis);
      ByteArrayOutputStream baos = new ByteArrayOutputStream(length);
      GZIPOutputStream gos = new GZIPOutputStream(baos);
      byte[] buffer = new byte[1024];
      int bytesRead;
      while ((bytesRead = bis.read(buffer)) != -1) {
        gos.write(buffer, 0, bytesRead);
      }
      bis.close();
      gos.close();
      System.out.println("Input Length: " + length);
      System.out.println("Output Length: " + baos.size());
    } catch (FileNotFoundException e) {
      System.err.println("Invalid Filename");
    } catch (IOException e) {
      System.err.println("I/O Exception");
    }
  }
}
           
         
    
  

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