Create checksum for a zip file : Zip Tar File « File Input Output « Java

Create checksum for a zip file



public class Main {
  public static void main(String[] args) throws Exception {
    CheckedOutputStream checksum = new CheckedOutputStream(
        new FileOutputStream(""), new Adler32());
    ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(checksum));

    int size = 0;
    byte[] buffer = new byte[1024];

    File dir = new File(".");
    String[] files = dir.list();

    for (int i = 0; i < files.length; i++) {
      System.out.println("Compressing: " + files[i]);
      FileInputStream fis = new FileInputStream(files[i]);
      ZipEntry zipEntry = new ZipEntry(files[i]);

      while ((size =, 0, buffer.length)) > 0) {
        zos.write(buffer, 0, size);
    System.out.println("Checksum   : " + checksum.getChecksum().getValue());


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