MD5加密

<span style="white-space:pre"></span>public String MD5(String s) {char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };try {byte[] strTemp = s.getBytes();// 使用MD5创建MessageDigest对象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 b = md[i];// 将没个数(int)b进行双字节加密str[k++] = hexDigits[b >> 4 & 0xf];str[k++] = hexDigits[b & 0xf];}return new String(str);} catch (Exception e) {return null;}}