MD5加密

package com.mall.common;


import java.security.MessageDigest;
/**
 * MD5算法  
 */
public class MD5 {
    
    public final static String getMD5(String s) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            byte[] strTemp = s.getBytes();
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            
            mdTemp.update(strTemp);
            
            byte[] md = mdTemp.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) {
            return null;
        }
    }
    
    public static void main(String[] args) {
        String pwd="123456";
        System.out.println("明文："+pwd+"密文："+MD5.getMD5(pwd));
    }

}