appletclient.java.bak

有关java的源程序,为讲授java程序设计课程使用

import java.applet.Applet;
import java.awt.*;
import java.net.*;
import java.io.*;
public class AppletClient extends Applet
{	TextArea AcceptText=new TextArea(4,25);
	TextField SendText=new TextField(25);
	Socket s=null;
	int port=1000;
	DataInputStream sin=null;
	PrintStream sout=null;
	String HostName="192.168.0.6";
	// 	String HostName="127.0.0.1";
	public void init()
	{	setLayout(new GridLayout(3,1));
		add(AcceptText);
		add(SendText);
		SendText.setText("Client Area");
		add(new Button("Submit"));
		try
		{	s=new Socket(HostName,port);
			sin=new DataInputStream(s.getInputStream());	
			sout=new PrintStream(s.getOutputStream());
		}
		catch(UnknownHostException e)
			{ AcceptText.appendText("\n"+"Don't know about host"+HostName);
			}
		catch(IOException e)
			{ AcceptText.appendText("\n"+"Canot get I/O for the Connect to"+HostName);
			}
		AcceptText.appendText("Connected to "+s.getInetAddress()+":"+s.getPort());
	}
	public boolean action(Event event, Object arg)
	{	if(arg.equals("Submit"))
		{	String acceptString;
			try
			{		if(SendText.getText()!=null)
					{   sout.println(SendText.getText());
						if((acceptString =sin.readLine())!=null)
						    AcceptText.appendText("\n"+acceptString);
						else
						{   AcceptText.appendText("\n"+"Closed by Server");
						}
					}
			}
			catch(IOException e)
				{ AcceptText.appendText("\n"+"I/O failed on the connection to"+HostName);
				}
		}
		else 
			return super.action(event,arg);
		return true;
	}
	public void destory()
	{	try
		{	sin.close();
			sout.close();
			s.close();
		}
	    catch(IOException e)
			{ AcceptText.appendText("\n"+"I/O failed on the connection to"+HostName);
			}
	}
}