Java MD5 File computeMD5(String filename)

Description

compute MD

License

Apache License

Declaration

public static String computeMD5(String filename) throws NullPointerException,
            java.security.NoSuchAlgorithmException, java.io.IOException, java.io.FileNotFoundException 

Method Source Code

//package com.java2s;
/*// w w  w  .j a v a2  s  . co  m
 * Copyright 2010 the original author or authors.
 * Copyright 2010 SorcerSoft.org.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;

import java.security.MessageDigest;

public class Main {
    public static String computeMD5(String filename) throws NullPointerException,
            java.security.NoSuchAlgorithmException, java.io.IOException, java.io.FileNotFoundException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        FileInputStream ifs = new FileInputStream(filename);
        ByteArrayOutputStream byteOutput = null;
        StringBuffer hexString = new StringBuffer();
        byte[] bytes = new byte[1024];
        int read;

        byteOutput = new ByteArrayOutputStream();
        while ((read = ifs.read(bytes)) > -1)
            byteOutput.write(bytes, 0, read);
        byte[] filebytes = byteOutput.toByteArray();
        // System.out.println("the files string is = "+new String(filebytes));
        byte[] hash = md.digest(filebytes);
        for (int i = 0; i < hash.length; i++) {
            hexString.append(Integer.toHexString(0xFF & hash[i]));
        }
        // System.out.println("HextSring="+hexString.toString());
        return hexString.toString();// new String(hash, "UTF-8");
    }
}

Related

1. computeMD5(File file)
2. computeMD5(File file)
3. computeMD5(final File file)
4. computeMd5Digest(final File file)
5. computeMD5Sum(final File file)