Read a zip file checksum value : ZipFile « File « Java Tutorial

1. Java Tutorial
2. File
3. ZipFile

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class Main {
  public static void main(String[] args) throws Exception {
    String zipname = "d.zip";
    CheckedInputStream checksum = new CheckedInputStream(
        new FileInputStream(zipname), new Adler32());
    ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));
    ZipEntry entry;

    while ((entry = zis.getNextEntry()) != null) {
      System.out.println("Unzipping: " + entry.getName());
      int size;
      byte[] buffer = new byte[2048];

      BufferedOutputStream bos = new BufferedOutputStream(
          new FileOutputStream(entry.getName()), buffer.length);
      while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
        bos.write(buffer, 0, size);
      }
      bos.flush();
      bos.close();
    }

    zis.close();
    System.out.println("Checksum = " + checksum.getChecksum().getValue());
  }
}