java.net Drills

The server side of a very simple LAN chat tool

/*



* Created on 2005-3-18
*
* TODO to change the template of this generated file go
* Window-preferences-java-code Style-code Templates
*/
Package netchat;

Import javax.swing.*;
Import java.io.*;
Import java.net.*;
Import java.awt.*;
Import java.awt.event.*;


/**
* @author Appletian
*
* TODO to change the template of this generated type comment go
* Window-preferences-java-code Style-code Templates
*/
public Class Server extends JFrame {
Private JTextField MessageBox;
Private JTextArea Infbox;
private ObjectInputStream input;
Private ObjectOutputStream output;
Private ServerSocket server;
Private Socket ServerSocket;

Public Server () {
Super ("Server");
Container C=getcontentpane ();

Messagebox=new JTextField ("");
Messagebox.setenabled (FALSE);

Messagebox.addactionlistener (new ActionListener () {
public void actionperformed (ActionEvent e) {
SendData (E.getactioncommand ());
}

});
C.add (Messagebox,borderlayout.north);

Infbox=new JTextArea ();
Infbox.setfont (New Font ("Serif", font.bold,12));
C.add (New JScrollPane (Infbox), borderlayout.center);

SetSize (500,400);
SetVisible (TRUE);

}


/**
* @param Actioncommand
*/
protected void SendData (String actioncommand) {
try{
Output.writeobject (Actioncommand);
Output.flush ();
Infbox.append ("\nsend<<" +actioncommand+ ">> to client...\n");
}
catch (IOException e) {
Infbox.append ("\nexceptionioinsenddatafunction ...");
}
}
public void Runserver () {
try{
Server=new ServerSocket (5000,100);
while (true) {
Waitforconnection ();
Getstreams ();
Processconnection ();
CloseConnection ();
}
}
catch (Eofexception e) {
Infbox.append ("\nerror in Runserverfuction");
}
catch (IOException e) {
E.printstacktrace ();
}

}

/**
*
*/
private void CloseConnection () throws IOException {
Infbox.append ("\nclose connection ...");
Messagebox.setenabled (FALSE);
Output.close ();
Input.close ();
Serversocket.close ();

}


/**
*
*/
private void Processconnection () throws IOException {
String mg= "\nconnection succeful";
Messagebox.setenabled (TRUE);
Output.writeobject (MG);
Output.flush ();

do{
try{
Mg= (String) input.readobject ();
Infbox.append ("\nsend to Client:" +MG);
Infbox.setcaretposition (Infbox.gettext (). Length ());
}
catch (ClassNotFoundException e) {
Infbox.append ("\ n unkown class received ...");

}
}while (mg!= "End");




}


/**
*
*/
private void Getstreams () throws IOException {
Output=new ObjectOutputStream (Serversocket.getoutputstream ());
Output.flush ();

Input=new ObjectInputStream (Serversocket.getinputstream ());

Infbox.append ("\nget Streams ...");


}


/**
*
*/
private void Waitforconnection () throws IOException {
Infbox.append ("Wait for a Client ...");
Serversocket=server.accept ();
Infbox.append ("Connected by" +serversocket.getinetaddress (). GetHostName ());


}


public static void Main (string[] args) {
Server my=new server ();
My.setdefaultcloseoperation (Jframe.exit_on_close);
My.runserver ();
}
}




Client



/*
* Created on 2005-3-18
*
* TODO to change the template of this generated file go
* Window-preferences-java-code Style-code Templates
*/
Package netchat;
Import javax.swing.*;

Import java.io.*;
Import java.net.*;
Import java.awt.*;
Import java.awt.event.*;

/**
* @author Appletian
*
* TODO to change the template of this generated type comment go
* Window-preferences-java-code Style-code Templates
*/
public class Client extends JFrame {

Private JTextField MessageBox;
Private JTextArea Infbox;
private ObjectInputStream input;
Private ObjectOutputStream output;
Private String mg= "";
Private String Chatserver;
Private Socket client;
Public client (String host) {
Super ("Client ...");
Chatserver=host;
Container C=getcontentpane ();

Messagebox=new JTextField ();
Messagebox.setenabled (FALSE);
Messagebox.addactionlistener (new ActionListener () {
public void actionperformed (ActionEvent e) {
SendData (E.getactioncommand ());
}


});
C.add (Messagebox,borderlayout.north);
Infbox=new JTextArea ();
C.add (Infbox,borderlayout.center);

SetSize (500,400);
SetVisible (TRUE);





}


/**
* @param Actioncommand
*/
protected void SendData (String actioncommand) {
try{
Mg=messagebox.gettext ();
Output.writeobject (MG);
Output.flush ();
Infbox.append ("\nsend to Server:" +MG);
}catch (IOException e) {
Infbox.append ("\nioexception in SendData.");
}

}
public void Runclient () {
try{

Connecttoserver ();
Getstreams ();
Processconnection ();
CloseConnection ();
}catch (IOException e) {
Infbox.append (E.tostring ());
}

}

/**
*
*/
private void CloseConnection () throws IOException {
TODO auto-generated Method Stub
Infbox.append ("\nclose ...");
Output.close ();
Input.close ();
Client.close ();

}


/**
*
*/
private void Processconnection () throws ioexception{
TODO auto-generated Method Stub
Messagebox.setenabled (TRUE);
do{
try{
Mg= (String) input.readobject ();
Infbox.append ("\nfrom server:" +MG);
Infbox.setcaretposition (Infbox.gettext (). Length ());
}catch (ClassNotFoundException e) {
Infbox.append ("classnotfound...\n");
}
}while (mg!= "End");
}


/**
*
*/
private void Getstreams () throws IOException {
TODO auto-generated Method Stub
Output=new ObjectOutputStream (Client.getoutputstream ());
Output.flush ();
Input=new ObjectInputStream (Client.getinputstream ());
Infbox.append ("Get" IO Stream. \ n ");

}


/**
*
*/
private void Connecttoserver () throws IOException {
TODO auto-generated Method Stub
Infbox.append ("Try connecting to server...\n");
Client=new Socket (Inetaddress.getbyname (chatserver), 5000);
Infbox.append ("Connect to Server:" +client.getinetaddress (). GetHostName () + "\ n");

}


public static void Main (string[] args) {
Client p;
if (args.length==0)
P=new Client ("127.0.0.1");
Else
P=new client (args[0]);
P.setdefaultcloseoperation (Jframe.exit_on_close);
P.runclient ();

}
}