java实现MD5和sha1加密

import java.security.MessageDigest;
import java.util.Scanner;

public class MD5Util {
    public final static String MD5(String s,String name) {//s是要加密的字符串，name是加密算法（sha1或者md5）
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        try {
            byte[] btInput = s.getBytes();

            MessageDigest mdInst = MessageDigest.getInstance(name);

            mdInst.update(btInput);

            byte[] md = mdInst.digest();

            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String in = input.next();
        String mi = input.next();
        System.out.println(MD5Util.MD5(in,mi));

    }
}