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();
}