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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是我的计算机名

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);

}

}

}

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#　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="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();

//加入用户验证.

//将服务器中的jb51.net.static文件写入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 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;

}

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# 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);

　　}

　　}

　　}

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@ 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

...