Java by API/java.util.zip/CheckedOutputStream

new CheckedOutputStream(OutputStream out, Checksum cksum)

 
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;
import java.util.zip.CheckedOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
public class Main {
  public static void main(String[] args) throws IOException {
    FileOutputStream f = new FileOutputStream("test.zip");
    CheckedOutputStream csum = new CheckedOutputStream(f, new Adler32());
    ZipOutputStream zos = new ZipOutputStream(csum);
    BufferedOutputStream out = new BufferedOutputStream(zos);
    zos.setComment("A test of Java Zipping");
    for (int i = 0; i < args.length; i++) {
      System.out.println("Writing file " + args[i]);
      BufferedReader in = new BufferedReader(new FileReader(args[i]));
      zos.putNextEntry(new ZipEntry(args[i]));
      int c;
      while ((c = in.read()) != -1)
        out.write(c);
      in.close();
    }
    out.close();

    System.out.println("Checksum: " + csum.getChecksum().getValue());
    System.out.println("Reading file");
    FileInputStream fi = new FileInputStream("test.zip");
    CheckedInputStream csumi = new CheckedInputStream(fi, new Adler32());
    ZipInputStream in2 = new ZipInputStream(csumi);
    BufferedInputStream bis = new BufferedInputStream(in2);
    ZipEntry ze;
    while ((ze = in2.getNextEntry()) != null) {
      System.out.println("Reading file " + ze);
      int x;
      while ((x = bis.read()) != -1)
        System.out.write(x);
    }
    System.out.println("Checksum: " + csumi.getChecksum().getValue());
    bis.close();

  }
}