使用JAVA实现nslookup命令

借助dnsjava工具，可轻松实现nslookup的模拟，dnsjava官网，dnsjava-2.1.7.jar下载

package cn.baokx;

import java.net.InetAddress;
import java.net.UnknownHostException;

import org.xbill.DNS.Lookup;
import org.xbill.DNS.Record;
import org.xbill.DNS.TextParseException;
import org.xbill.DNS.Type;

public class NetWork {
	public static void main(String[] args) throws UnknownHostException, TextParseException {
		InetAddress address = InetAddress.getByName("baidu.com");
		System.out.println(address.getHostAddress());

		//查询域名对应的IP地址
		Lookup lookup = new Lookup("baidu.com", Type.A);
		lookup.run();
		if (lookup.getResult() != Lookup.SUCCESSFUL){
		    System.out.println("ERROR: " + lookup.getErrorString());
		    return;
		}
		Record[] answers = lookup.getAnswers();
		for(Record rec : answers){
		    System.out.println(rec.toString());
		}
	}
}