MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.security.DigestInputStream;
import java.security.MessageDigest;

public class MainClass {
    private static int BUFFER_SIZE = 32 * 1024;

    public static void main(String[] args) throws Exception {
        System.out.println("test.txt: " + md("test.txt"));
    }

    public static String md(String f) throws Exception {
        BufferedInputStream file = new BufferedInputStream(new FileInputStream(f));
        MessageDigest md = MessageDigest.getInstance("SHA-1");
        DigestInputStream in = new DigestInputStream(file, md);
        int i;
        byte[] buffer = new byte[BUFFER_SIZE];
        do {
            i = in.read(buffer, 0, BUFFER_SIZE);
        } while (i == BUFFER_SIZE);
        md = in.getMessageDigest();
        in.close();

        return new String(md.digest());
    }
}