java MD5加密简洁代码

try {

 MessageDigest md = MessageDigest.getInstance("MD5");

 md.update(stringB.getBytes());

 byte b[] = md.digest();

  

 int i;

  

 StringBuffer buf = new StringBuffer("");

 for (int offset = 0; offset < b.length; offset++) {

 i = b[offset];

 if (i < 0)

 i += 256;

 if (i < 16)

 buf.append("0");

 buf.append(Integer.toHexString(i));

 }

  

 sign = buf.toString().toUpperCase();

  

 } catch (NoSuchAlgorithmException e) {

 e.printStackTrace();

 }