Compressing a File
This example creates a ZIP file with one entry. 

 try {
     String inFilename = "infile";
     String outFilename = "outfile.zip";
     FileInputStream in = new FileInputStream(
       inFilename);
     ZipOutputStream out = new ZipOutputStream(
       new FileOutputStream(outFilename));
     
     // Add ZIP entry to output stream.
     out.putNextEntry(new ZipEntry(inFilename));
              
     byte[] buf = new byte[1024];
     int len;
      
       while ((len = in.read(buf)) > 0) {
           out.write(buf, 0, len);
       }
     
     out.closeEntry();
     out.close();
     in.close();
 } catch (IOException e) {
 }