import java.io.UnsupportedEncodingException;  import java.security.MessageDigest;  import java.security.NoSuchAlgorithmException;  public class MD5Util {        public static String generateMD5(String input)        {          MessageDigest messageDigest = null;          try {            messageDigest = MessageDigest.getInstance("MD5");            messageDigest.reset();            messageDigest.update(input.getBytes("UTF-8"));          } catch (NoSuchAlgorithmException e) {            System.out.println("NoSuchAlgorithmException caught!");            System.exit(-1);          } catch (UnsupportedEncodingException e) {            e.printStackTrace();          }          byte[] byteArray = messageDigest.digest();          StringBuffer md5StrBuff = new StringBuffer();          for (int i = 0; i < byteArray.length; i++) {            if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)              md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));            else {              md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));            }          }          return md5StrBuff.toString();        }      }