Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {

    public static byte[] encryptMD5File(String filePath) {
        return encryptMD5File(new File(filePath));
    }

    public static byte[] encryptMD5File(File file) {
        FileInputStream in = null;
        try {
            in = new FileInputStream(file);
            FileChannel channel = in.getChannel();
            MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(buffer);
            return md.digest();
        } catch (NoSuchAlgorithmException | IOException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException ignored) {
                }
            }
        }
        return null;
    }
}