Java MD5 File computeMd5Digest(final File file)

Description

Returns the MD5 hash of the given file.

License

Apache License

Parameter

Parameter	Description
file	a file

Exception

Parameter	Description
IOException	if the MD5 hash could not be computed

Return

the MD5 hash

Declaration

public static byte[] computeMd5Digest(final File file) throws IOException 

Method Source Code

//package com.java2s;
/*//from   w w  w.  j  av  a  2s  .c  o  m
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.File;
import java.io.FileInputStream;

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

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

public class Main {
    /**
     * Returns the MD5 hash of the given file.
     *
     * @param file a file
     * @return the MD5 hash
     * @throws IOException if the MD5 hash could not be computed
     */
    public static byte[] computeMd5Digest(final File file) throws IOException {
        try (final FileInputStream fis = new FileInputStream(file)) {
            return computeMd5Digest(fis);
        }
    }

    /**
     * Returns the MD5 hash of the given stream.
     *
     * @param stream an input stream
     * @return the MD5 hash
     * @throws IOException if the MD5 hash could not be computed
     */
    public static byte[] computeMd5Digest(final InputStream stream) throws IOException {
        final MessageDigest digest;
        try {
            digest = MessageDigest.getInstance("MD5");
        } catch (final NoSuchAlgorithmException nsae) {
            throw new IOException(nsae);
        }

        int len;
        final byte[] buffer = new byte[8192];
        while ((len = stream.read(buffer)) > -1) {
            if (len > 0) {
                digest.update(buffer, 0, len);
            }
        }

        return digest.digest();
    }
}

Related

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