java密码MD5加密

import java.security.MessageDigest;  import java.security.NoSuchAlgorithmException;  import org.apache.log4j.Logger;     /**    * 将密码进行MD5加密处理    */  public class PassWordDigester {        private static Logger logger = Logger.getLogger(PassWordDigester.class);        private static final String ALGORITHM_MD5 = "MD5";        /**       * Encrypt the password with MD5       * @param pass the password to encryption       * @return encryption string       */      public static String getPassMD5(String pass) {          String keys = null;          try {              MessageDigest md = MessageDigest.getInstance(ALGORITHM_MD5);              if (pass == null) {                  pass = "";              }              byte[] bPass = pass.getBytes("UTF-8");              md.update(bPass);  //            keys = new String(md.digest(), "GBK");              keys = bytesToHexString(md.digest());          }          catch (NoSuchAlgorithmException aex) {              logger.error("there is no " + ALGORITHM_MD5 + " Algorithm!");          }          catch (java.io.UnsupportedEncodingException uex) {              logger.error("can not encode the password - " + uex.getMessage());          }          return keys;      }            /**       * 将beye[]转换为十六进制字符串       * @param bArray       * @return       */     public static final String bytesToHexString(byte[] bArray) {       StringBuffer sb = new StringBuffer(bArray.length);       String sTemp;       for (int i = 0; i < bArray.length; i++) {        sTemp = Integer.toHexString(0xFF & bArray[i]);        if (sTemp.length() < 2){         sb.append(0);        }        sb.append(sTemp.toUpperCase());       }       return sb.toString();    }        public static void main(String[] args){     String a = "qazwsx";     System.out.println(getPassMD5(a));    }  }