appletclient.java

java的重要部分

// AppletClient.java
/**
 * This a Socket Applet Client program
 * @version 1.0 1999/12/27
 * @author Huang Jian-chang
**/
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;

public class AppletClient extends Applet {  
        String info="";
	public void init(){
               try{	
			
			String  connectto = getCodeBase().getHost();
                        Socket connection;
			// connect to server
			if(connectto.equals("localhost")){
				connection=new Socket(InetAddress.getLocalHost(),5000);

			}
			else{
				connection=new Socket(InetAddress.getByName(connectto),5000);				
			}			
			DataInputStream  input=new DataInputStream(connection.getInputStream());                       

			// read information from server                        
                        info = input.readUTF();
                        System.out.println(info);
			connection.close();                                                               
		}
		catch(SecurityException e){
			System.out.println("SecurityException when connecting Server!");		
			info = e.toString();
		}		
		catch(IOException e){
			System.out.println("IOException when connecting Server!");   
                        info = e.toString();
		}     
       }    
       public void paint(Graphics g){
             g.drawString(info,20,20);
       }

}