java密碼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
@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));
  }
}</pre>