java实现MD5和sha1加密

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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));    }}

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