JDK自带MD5加密算法

其实jdk就自带了md5加密算法，直接调用很方便

public static String md5(String source) {StringBuffer sb = new StringBuffer(32);try {MessageDigest md = MessageDigest.getInstance("MD5");byte[] array = md.digest(source.getBytes("utf-8"));for (int i = 0; i < array.length; i++) {sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).toUpperCase().substring(1, 3));}} catch (Exception e) {logger.error("Can not encode the string '" + source + "' to MD5!", e);return null;}return sb.toString();}