使用DNS编码对域名进行编码，如下所述，并将其作为字节数组返回。

//package com.nowjava;

/* 
*来 自
 NowJava.com
*/

import java.util.StringTokenizer;


public class Main {

    public static void main(String[] argv) throws Exception {

        String domainName = "nowjava.com";

        System.out.println(java.util.Arrays

                .toString(encodeDomainName(domainName)));

    }


    /**

     * Encodes a domain name using DNS encoding, as described

     * <a href="http://www.tcpipguide.com/free/t_DNSNameNotationandMessageCompressionTechnique.htm">here</a> and

     * returns it as a byte array.

     *

     * @param domainName

     * @return Encoded domain name

     */

    public static byte[] encodeDomainName(String domainName) {


        byte[] result = new byte[domainName.length() + 2];

        int position = 0;

        StringTokenizer tokenizer = new StringTokenizer(domainName, ".@");


        while (tokenizer.hasMoreTokens()) {

            String token = tokenizer.nextToken();/* 来自 N o w J a v a . c o m*/

            result[position] = (byte) token.length();

            position++;