Simple server and client code instances

Simple server and client code instances

Exercise the application of socket, datainputstream, dataoutputstream, thread, and actionlistener. The function is very simple: Enter the user name in the client and press enter to check whether the user name is valid. I have defined that only jiqimiao is valid.

The server code is as follows:

Import java. AWT .*;
Import java. Io .*;
Import java.net .*;
Import java. util .*;

Import javax. Swing .*;

/**
* Server programs
* @ Author Zuo Jie
*
*/
Public class testserver extends jframe {
/**
*
*/
Private Static final long serialversionuid =-4148974450944551683l;

Private jtextarea JTA = new jtextarea ();

Public static void main (string [] ARGs ){
New testserver ();
}

Public testserver (){
This. getcontentpane (). setlayout (New borderlayout ());
This. getcontentpane (). Add (New jscrollpane (JTA), borderlayout. center );
Settitle ("server ");
Setsize (500,300 );
Setdefaclocloseoperation (jframe. exit_on_close );
Setvisible (true );
Try {
Serversocket = new serversocket (5000); // bind the server port
JTA. append ("Server start at" + new date () + "");
While (true ){
Socket socket = serversocket. Accept (); // server listener
// Start the listening thread
Handleclint thread = new handleclint (socket );
Thread. Start ();
}
} Catch (exception e ){
// Todo auto-generated Catch Block
E. printstacktrace ();
}
}
/**
* Receiving and sending client threads
* @ Author Zuo Jie
*
*/
Class handleclint extends thread {
Private Socket socket;

Public handleclint (Socket socket ){
This. Socket = socket;
}

Public void run (){
Try {
Datainputstream inputfromclient = new datainputstream (socket
. Getinputstream ());
Dataoutputstream outputtoclient = new dataoutputstream (socket
. Getoutputstream ());
While (true ){
String ins = datainputstream. readutf (inputfromclient); // receives client information
String outs = "you are not a legal user ";
If (INS. Equals ("jiqimiao ")){
Outs = "Welcome:" + INS;
}
Outputtoclient. writeutf (outs); // sends the information to the client.
JTA. append (outs + "");
}
} Catch (exception e ){
}
}
}
}

The client code is as follows:

Import java. AWT. borderlayout;
Import java. AWT. event. actionevent;
Import java. AWT. event. actionlistener;
Import java. Io. datainputstream;
Import java. Io. dataoutputstream;
Import java. Io. ioexception;
Import java.net. Socket;

Import javax. Swing. jframe;
Import javax. Swing. jlabel;
Import javax. Swing. jpanel;
Import javax. Swing. jscrollpane;
Import javax. Swing. jtextarea;
Import javax. Swing. jtextfield;

/**
* Client program
* @ Author Zuo Jie
*
*/
Public class testclient extends jframe implements actionlistener {
/**
*
*/
Private Static final long serialversionuid =-1751294222460334070l;
Private jtextarea JTA = new jtextarea ();
Private jtextfield JTF = new jtextfield ();
Private dataoutputstream toserver;
Private datainputstream fromserver;
Public static void main (string [] ARGs ){
New testclient ();
}
Public testclient (){
Jpanel P = new jpanel ();
P. setlayout (New borderlayout ());
P. Add (New jlabel ("Enter the User name:"), borderlayout. West );
P. Add (JTF, borderlayout. center );
JTF. sethorizontalalignment (jtextfield. Left );

This. getcontentpane (). setlayout (New borderlayout ());
This. getcontentpane (). Add (p, borderlayout. North );
This. getcontentpane (). Add (New jscrollpane (JTA), borderlayout. center );
JTF. addactionlistener (this); // Add event listening
Settitle ("client ");
Setsize (500,300 );
Setdefaclocloseoperation (jframe. exit_on_close );
Setvisible (true );
Try {
Socket socket = new socket ("localhost", 5000); // link to specify the server and Port
This. fromserver = new datainputstream (socket. getinputstream ());
This. toserver = new dataoutputstream (socket. getoutputstream ());
} Catch (ioexception e ){
// Todo auto-generated Catch Block
JTA. append (E. tostring () + "");
}

}
Public void actionreceivmed (actionevent e) {// define the listener
If (E. getsource () instanceof jtextfield ){
Try {
String TOS = JTF. gettext (). Trim ();
Toserver. writeutf (ToS );
Toserver. Flush ();
String gets = datainputstream. readutf (fromserver );;
JTA. append (gets + "");
} Catch (ioexception E1 ){
// Todo auto-generated Catch Block
System. Err. println (E1 );
}


}
}

}

Everyone learns and makes progress together.