普通的域名解析方法：
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import java.net.*; public class Kkkk { public static void main(String args[]) throws Exception { InetAddress address = InetAddress.getByName("wxh-PC");// wxh-PC是我的計算機名 System.out.println(address); System.out.println("-----"); InetAddress address1 = InetAddress.getLocalHost(); System.out.println(address1); InetAddress[] addresses = InetAddress .getAllByName("www.baidu.com"); System.out.println(addresses.length); for (InetAddress addr : addresses) { System.out.println(addr); } } } |
實現具有動態主機IP的域名解析
目的利用一臺INTERNET DNS HOST 將域名定向到家中(個人)的主機上.
目前CABLEMODEM已經很快了,而且有動態IP,所以就有了將域名解析到個人機器的上可能.
只要通過很簡單的設置就可以搞定.
例如你有一個域名叫 yourdomain.com ,你可以將此域名解析任意的主機.
1.服務器 (IP: A.A.A.A) 啟動DNS動態解析的一個小進程.
jb51.net的域名文件為 /var/named/jb51.net
再建個/var/named/jb51.net.static (模板文件可以用來生成jb51.net的)
(JDK1.3 , linux )
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# 原代碼如下: ThreadDNSReloadServer.javaimport 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="jb51.net";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();//加入用戶驗證.//將服務器中的jb51.net.static文件寫入jb51.net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 reloadString command="ndc reload " + DNSFILE ;java.lang.Runtime.getRuntime().exec(command);}catch ( Exception e){ System.out.println(e);}}private Socket incoming;private int counter;} |
2.客戶機(windows / linux)
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# 客戶端每次啟動時加入到開機啟動(或進程中): 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 樣本文件: ( jb51.net.static)
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@ ns.dnsserver.com xxxxxxxxxhost IN A 127.0.0.1 // 此處就是要更改的地方www IN CNAME host... |
