getipaddr.java

来自「java课件 java课件 java课件 java课件」· Java 代码 · 共 47 行

import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GetIPAddr extends JFrame{
  private JTextField jtf =new JTextField(20);
  private JButton jbtn = new JButton("OK");
  private JLabel jlb= new JLabel("                       ");	
  private Container cp =null;
  
  public GetIPAddr(){
    super("Get IP Address");
    
    cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(jtf);
    cp.add(jbtn);
    cp.add(jlb);	
  	
  	jbtn.addActionListener(new ActionL());
  	
  	setSize(300,200);
  	setVisible(true);
  	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }	
  
  public class ActionL implements ActionListener{
  	public void actionPerformed(ActionEvent ae){
  	  String addr = jtf.getText();
  	  InetAddress address=null;
  	  try{
  	  	address=InetAddress.getByName(addr);
  	  	jlb.setText("Name:"+address.getHostName()+
  	  	     " IP Address:"+address.getHostAddress());
  	  }	catch(UnknownHostException e){
  	  	
  	  	JOptionPane.showMessageDialog(
  	  		GetIPAddr.this,"Ip address of "+addr+" does not exists.");
  	  }
  	}
  }	
  public static void main(String args[]) throws Exception{
    new GetIPAddr();
  }
}