e首發票Signature Java版 Ver2

Signature.java

import java.util.*;
import java.math.BigInteger;
import java.security.MessageDigest;

public class Main {
    public static void main(String[] args) throws Exception {
        String _timeStamp = "1496419339";
		String _hashSalt = "909043347504457A92EA5565778A26C6";
        
        System.out.println(getSHA256(_timeStamp+_hashSalt));
    }
    
    public static String getSHA256(String input){
    	String toReturn = null;
    	try {
    	    MessageDigest digest = MessageDigest.getInstance("SHA-256");
    	    digest.reset();
    	    digest.update(input.getBytes("utf8"));
    	    toReturn = String.format("%064x", new BigInteger(1, digest.digest()));
    	} catch (Exception e) {
    	    e.printStackTrace();
	    }
	
	    return toReturn;
    }
}