普通的網域解析方法：
import java.net.*; public class Kkkk { public static void main(String args[]) throws Exception { InetAddress address = InetAddress.getByName("wxh-PC");// wxh-PC是我的電腦名稱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 (Inet:Address addr. ) { System.out.println(addr); } } }實作具有動態主機IP的網域解析
目的利用一台INTERNET DNS HOST 將網域導向到家中(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定就可以搞定.
例如你有一個網域名叫yourdomain.com ,你可以將此網域解析任意的主機.
1.伺服器(IP: AAAA) 啟動DNS動態解析的一個小進程.
VeVB.COm的網域檔案為/var/named/VeVB.COm
再建個/var/named/VeVB.COm.static (模板檔案可以用來產生VeVB.COm的)
(JDK1.3 , linux )
# 原程式碼如下: 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/"; StringFILE="Unkown"; String DNSFILEPATH="/var/named/"; StringFILE ="VeVB.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(); //加入使用者驗證. //將伺服器中的VeVB .COm.static檔案寫入VeVB.COm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.WithWith ("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.客戶機(windows / linux)
# 用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("AAAA",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 樣本檔案: ( VeVB.COm.static)
@ ns.dnsserver.com xxxxx xxxx host IN A 127.0.0.1 // 這裡就是要更改的地方www IN CNAME host ...