Chapter One Introduction to Java Network programming _echo

Server-side program Echoserver.java

Import java.io.*;
Import java.net.*;
public class Echoserver {
private int port=8000;
Private ServerSocket serversocket;

Public Echoserver () throws IOException {
ServerSocket = new ServerSocket (port);
System.out.println ("server start");
}

public string echo (string Msg) {
return "echo:" + msg;
}

Private PrintWriter getwriter (socket Socket) throws ioexception{
OutputStream socketout = Socket.getoutputstream ();
return new PrintWriter (socketout,true);
}
Private BufferedReader Getreader (socket Socket) throws ioexception{
InputStream Socketin = Socket.getinputstream ();
return new BufferedReader (new InputStreamReader (socketin));
}

public void service () {
While (true) {
Socket socket=null;
try {
Socket = Serversocket.accept (); Waiting for customer to connect
System.out.println ("New Connection accepted"
+socket.getinetaddress () + ":" +socket.getport ());
BufferedReader BR =getreader (socket); Du Qu
PrintWriter pw = Getwriter (socket);

String msg = null;
While (msg = Br.readline ()) = null) {
System.out.println (msg);
Pw.println ("--------------this is the data uploaded from the server--------------");
If (msg.equals ("bye"))//if the customer sends a message as "bye", end the communication
Break
}
}catch (ioexception E) {
E.printstacktrace ();
}finally {
try{
If (socket!=null) socket.close (); Disconnect Connection
}catch (ioexception E) {e.printstacktrace ();}
}
}
}

public static void main (String Args[]) throws IOException {
New Echoserver (). Service ();
}
}
Client program Echoclient.java
Import java.net.*;
Import java.io.*;
Import java.util.*;
public class Echoclient {
Private String host= "localhost";
private int port=8000;
Private Socket socket;

Public Echoclient () throws ioexception{
Socket=new Socket (host,port);
}
public static void main (String Args[]) throws ioexception{
New Echoclient (). Talk ();
}
Private PrintWriter getwriter (socket Socket) throws ioexception{
OutputStream socketout = Socket.getoutputstream ();
return new PrintWriter (socketout,true);
}
Private BufferedReader Getreader (socket Socket) throws ioexception{
InputStream Socketin = Socket.getinputstream ();
return new BufferedReader (new InputStreamReader (socketin));
}
public void Talk () throws IOException {
try{
BufferedReader Br=getreader (socket);
PrintWriter Pw=getwriter (socket);
BufferedReader localreader=new bufferedreader (new inputstreamreader (system.in));
String msg=null;
System.out.println ("$$$$$$$$$$$$$$$$$$$");
While ((msg=localreader.readline ())!=null) {

Pw.println (msg+ "aaaaaaaaaaaaa"); Data passed to the server
Thread.Sleep (3000);
System.out.println ("br.readline ()" +br.readline ()); Read the Server's data

If (msg.equals ("bye"))
Break
}
}catch (Exception E) {
E.printstacktrace ();
}finally{
Try{socket.close ();} Catch (ioexception e) {e.printstacktrace ();}
}
}
}


/****************************************************
* Sun Weichen *
* Source: <<java Network programming Fine >> *
* Technical Support website: www.javathinker.org *
***************************************************/

Chapter I Introduction to Java Network programming _echo