Calculating the Checksum of a File : Checksum « File « Java Tutorial

1. Java Tutorial
2. File
3. Checksum

import java.io.FileInputStream;
import java.util.zip.Adler32;
import java.util.zip.CheckedInputStream;

public class Main {
  public static void main(String[] argv) throws Exception {
    CheckedInputStream cis = new CheckedInputStream(new FileInputStream("filename"), new Adler32());
    byte[] tempBuf = new byte[128];
    while (cis.read(tempBuf) >= 0) {
    }
    long checksum = cis.getChecksum().getValue();
  }
}