java chat applet -- client.txt

Applet聊天室代码

发信人: jallon (javaFan), 信区: JAVA 
标  题: 源码公布1 
发信站: 华南网木棉站 (Sun Nov 30 19:49:04 1997), 转信 
  
客户端Java Applet: 
import java.applet.*; 
import java.awt.*; 
import java.net.*; 
import java.io.*; 
  
public final class JavaChatApplet extends Applet 
{ 
        private Label l1,l2; 
        private Panel p1,p2; 
        private TextField tf; 
        private TextArea ta; 
        private DatagramPacket sendPacket,receivePacket; 
        private DatagramSocket sendSocket,receiveSocket; 
  
        public void init() 
        { 
                setBackground(Color.yellow); 
                setLayout(new BorderLayout()); 
                p1=new Panel(); 
                p1.setLayout(new BorderLayout()); 
                l1=new Label("Our chatting as follows:"); 
                ta=new TextArea(10,20); 
                ta.setText("Jallon say:\tI'm jallon and glad to see u."+ 
                        "\n\t\t"+"If u can't connect me, it means that i'm busy 
alking to a lady" 
                        +"\n\t\t"+"wait a moment...Connect again?!\n"); 
                p1.add("North",l1); 
                p1.add("Center",ta); 
                add("North",p1); 
                p2=new Panel(); 
                p2.setLayout(new BorderLayout()); 
                l2=new Label("Guest speak now:"); 
                p2.add("Center",l2); 
                tf=new TextField(20); 
                tf.setText(""); 
                p2.add("South",tf); 
                add("Center",p2); 
                show(); 
        } 
  
        public void start() 
        { 
                waitForPackets(); 
        } 
  
        public void waitForPackets() 
        { 
                try{ 
                        sendSocket=new DatagramSocket(); 
                        receiveSocket=new DatagramSocket(5001); 
                } 
                catch(SocketException se) 
                {} 
                while(true) 
                { 
                        try{ 
                                byte array[]=new byte[100]; 
                                receivePacket=new DatagramPacket(array,array.len 
th); 
                                receiveSocket.receive(receivePacket); 
                                ta.appendText("\nJallon Say:\t"); 
                                byte data[]=receivePacket.getData(); 
                                String received=new String(data,0); 
                                ta.appendText(received); 
                        } 
                        catch(IOException ioe) 
                        { 
                                ta.appendText("sorry, can't get through...\n"); 
                                ta.appendText("problem lies at "+ioe.toString()+ 
wait and connect again...\n"); 
                        } 
                } 
        } 
  
        public boolean action(Event e,Object o) 
        { 
                try{ 
                        ta.appendText("\nGuest Say:\t"); 
                        String s=o.toString(); 
                        ta.appendText(s); 
                        byte data[]=new byte[100]; 
                        s.getBytes(0,s.length(),data,0); 
                        sendPacket=new DatagramPacket(data,s.length(),InetAddres 

.getByName("202.38.214.236"),5000); 
                        sendSocket.send(sendPacket); 
                } 
                catch(IOException ioe) 
                { 
                        ta.appendText("sorry, net suddently wrong???\n"); 
                        ta.appendText("problem lies at "+ioe.toString()+"wait an 
 connect again...\n"); 
                } 
                return true; 
        } 
} 
  
  
--