java密碼如何?MD5加密

import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import org.apache.log4j.Logger;     /**  * 將密碼進行MD5加密處理  */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 * 查看本欄目更多精彩內容：http://www.bianceng.cnhttp://www.bianceng.cn/Programming/Java/     * @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;    }            /**     * 將beye[]轉換為十六進位字串     * @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));  }}