java实现具有动态主机IP的域名解析

<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> 目的利用一台INTERNET DNS HOST 将域名定向到家中(个人)的主机上. 目前CABLEMODEM已经很快了,而且有动态IP,所以就有了将域名解析到个人机器的上可能. 只要通过很简单的设置就可以搞定. 例如你有一个域名叫 yourdomain.com ,你可以将此域名解析任意的主机. 1.服务器 (IP: A.A.A.A) 启动DNS动态解析的一个小进程. yourdomain.com的域名文件为 /var/named/yourdomain.com 再建个/var/named/yourdomain.com.static (模板文件可以用来生成yourdomain.com的) (JDK1.3 , linux ,找个网管帮一下吧:) ================================================= # 原代码如下: ThreadDNSReloadServer.java import java.io.*; import java.net.*; public class ThreadDNSReloadServer { public static void main(String[] args) { int i=1; try { ServerSocket s=new ServerSocket(8189); for (;;) { Socket incoming =s.accept(); System.out.println("accept new client: " i); new ThreadDNSReloadHandle(incoming,i).start(); i ; } } catch (Exception e) { System.out.println(e); } } } class ThreadDNSReloadHandle extends Thread { public ThreadDNSReloadHandle(Socket i,int c) { incoming= i; counter=c; } public void run() { try { BufferedReader in=new BufferedReader(new InputStreamReader(incoming.getInputStream())); String User="Unkown"; String DNSFILEPATH="/var/named/"; String DNSFILE="yourdomain.com"; String HOSTIP="127.0.0.1"; boolean USER_VALIDATED=true ; boolean done=false; while ( !done ) { String str=in.readLine(); //validate user; if ( str ==null ) done=true; else { str=str.trim(); if ( str.substring(0,2).equals("LA") ) { if (str.length() >2) User=str.substring(2); } if ( str.substring(0,2).equals("LB") ) { if (str.length() >2) DNSFILE=str.substring(2); } if ( str.substring(0,2).equals("LC") ) { if (str.length() >2) HOSTIP=str.substring(2); } if ( str.trim().equals("BYE")) done = true; } } incoming.close(); //加入用户验证. //将服务器中的yourdomain.com.cn.static文件写入yourdomain.com.cn中 String DNSTMP =DNSFILEPATH DNSFILE ".static"; BufferedReader sin=new BufferedReader(new FileReader(DNSTMP)); PrintWriter sout=new PrintWriter(new FileWriter(DNSFILEPATH DNSFILE) , true); String s; while ((s=sin.readLine()) != null) { if (s.startsWith("host")) { s="host IN A " HOSTIP; sout.println(s); s="@ IN A " HOSTIP; } sout.println(s); } //System.out.println("User:" User ); //System.out.println("DNSFILE:" DNSFILE ); //System.out.println("HOSTIP:" HOSTIP ); //ndc reload String command="ndc reload " DNSFILE ; java.lang.Runtime.getRuntime().exec(command); } catch ( Exception e) { System.out.println(e); } } private Socket incoming; private int counter; } 2.客户机(windows / linux) ============================================================== # 客户端每次启动时加入到开机启动(或进程中): SockTest.java import java.io.*; import java.net.*; public class SocketTest { public static void main(String[] args) { try { Socket s=new Socket("A.A.A.A",8189); BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream())); PrintWriter out=new PrintWriter(s.getOutputStream(),true); InetAddress localHostAddress =InetAddress.getLocalHost() ; //get LocalHost Ip out.println("LAguest"); out.println("LByourdomain.com"); out.println("LC" localHostAddress.getHostAddress() ); out.close(); s.close(); } catch (IOException e) { System.out.println(e); } } } ========================================================= dns 样本文件: ( yourdomain.com.static) @ ns.dnsserver.com xxxxx xxxx ...... host IN A 127.0.0.1 // 此处就是要更改的地方 www IN CNAME host ... (我已经测试过还不错,对cablemodem的用户来说是太爽了!:)