/*****************************************************************/
/* Copyright 2013 Code Strategies                                */
/* This code may be freely used and distributed in any project.  */
/* However, please do not remove this credit if you publish this */
/* code in paper or electronic form, such as on a web site.      */
/*****************************************************************/

package test;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.codec.binary.Hex;

public class MessageDigestForUrl {

	public static void main(String[] args) throws NoSuchAlgorithmException, FileNotFoundException, IOException {

		URL url = new URL("http://www.google.com");
		InputStream is = url.openStream();
		MessageDigest md = MessageDigest.getInstance("MD5");
		String digest = getDigest(is, md, 2048);

		System.out.println("MD5 Digest:" + digest);

	}

	public static String getDigest(InputStream is, MessageDigest md, int byteArraySize)
			throws NoSuchAlgorithmException, IOException {

		md.reset();
		byte[] bytes = new byte[byteArraySize];
		int numBytes;
		while ((numBytes = is.read(bytes)) != -1) {
			md.update(bytes, 0, numBytes);
		}
		byte[] digest = md.digest();
		String result = new String(Hex.encodeHex(digest));
		return result;
	}

}