Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.io.FileInputStream;

import java.io.IOException;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String checkSum(String path) {
        String checksum = null;
        try {
            FileInputStream fis = new FileInputStream(path);
            MessageDigest md = MessageDigest.getInstance("MD5");

            //Using MessageDigest update() method to provide input
            byte[] buffer = new byte[8192];
            int numOfBytesRead;
            while ((numOfBytesRead = fis.read(buffer)) > 0) {
                md.update(buffer, 0, numOfBytesRead);
            }
            byte[] hash = md.digest();
            checksum = new BigInteger(1, hash).toString(16); //don't use this, truncates leading zero
        } catch (IOException | NoSuchAlgorithmException ignored) {
        }
        assert checksum != null;
        return checksum.trim();
    }
}