MD5加密算法(2)

/** * MD5加密 *  * @param s * @return */private static String MD5(String s, String charsetname) {char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };try {byte[] strTemp;if (null == charsetname || "".equals(charsetname)) {strTemp = s.getBytes();} else {strTemp = s.getBytes(charsetname);}MessageDigest mdTemp = MessageDigest.getInstance("MD5");mdTemp.update(strTemp);byte[] md = mdTemp.digest();int j = md.length;char str[] = new char[j * 2];int k = 0;for (int i = 0; i < j; i++) {byte byte0 = md[i];str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}return new String(str);} catch (Exception e) {return null;}}