Java MD5 Sum md5sum(File file)

Description

mdsum

License

Open Source License

Declaration

public static String md5sum(File file) throws NoSuchAlgorithmException, FileNotFoundException, IOException 

Method Source Code

//package com.java2s;
/*/*from w w  w  .j av  a  2  s .  co  m*/
 * Utils.java - Created on Feb 2, 2004
 * 
 * Copyright (C) 2003-2004 Sebastian Rodriguez
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
    
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Last Update: $Date: 2004/03/12 17:25:14 $
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.io.InputStream;

import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String md5sum(File file) throws NoSuchAlgorithmException, FileNotFoundException, IOException {
        return createMD5(new FileInputStream(file));
    }

    private static String createMD5(final InputStream data) throws NoSuchAlgorithmException, IOException {
        MessageDigest md5 = MessageDigest.getInstance("MD5");

        DigestInputStream dis = new DigestInputStream(data, md5);
        while (dis.read() != -1) {
            ;
        }
        dis.close();
        data.close();

        byte[] fileDigest = md5.digest();
        StringBuffer checksumSb = new StringBuffer();
        for (int i = 0; i < fileDigest.length; i++) {
            String hexStr = Integer.toHexString(0x00ff & fileDigest[i]);
            if (hexStr.length() < 2) {
                checksumSb.append("0");
            }
            checksumSb.append(hexStr);
        }
        return checksumSb.toString();
    }
}

Related

1. md5sum(byte[] input, int length)
2. MD5Sum(byte[] par1Data)
3. md5sum(File f)
4. md5sum(File f, char[] cbuf, MessageDigest digest, byte[] bbuf)
5. md5sum(File file)
6. md5sum(File library)
7. md5sum(InputStream file)
8. md5sum(InputStream in)
9. md5sum(String data)