Java MD5 String md5(File f)

Description

md

License

Apache License

Declaration

static public String md5(File f) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   ww  w.  ja v  a  2s .co m*/
 * Copyright 2015 Fizzed Inc.
 *
 * 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.File;
import java.io.IOException;

import java.nio.file.Files;

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

public class Main {
    static public String md5(File f) throws IOException {
        try {
            byte[] b = Files.readAllBytes(f.toPath());
            byte[] hash = MessageDigest.getInstance("MD5").digest(b);
            return byteArrayToHex(hash);
        } catch (NoSuchAlgorithmException e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    static public String byteArrayToHex(byte[] a) {
        StringBuilder sb = new StringBuilder(a.length * 2);
        for (byte b : a) {
            sb.append(String.format("%02x", b & 0xff));
        }
        return sb.toString();
    }
}

Related

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2. md5(File f)
3. md5(File f)
4. md5(File f)
5. md5(File file)
6. md5(File file)
7. md5(File file)
8. md5(File gcdZipFile)