Java socket point to point and opposite point programming instance

Several classes related to socket programming:

InetAddress

Socket: Used on client

ServerSocket: Used on server side

One. Point to Point Communication

Server side:

Package server;


import java.io.*;


import java.net.*;


public class Server {


private int port;


public Server (int port) {


This.port=port;


start ();


}


//Converts the information received from the client into uppercase


Public String process (string line) {


return Line.touppercase ();


}


public void Start () {


try{


//Socket creation based on port


serversocket myscoket=new ServerSocket (port);


//Display connection Information


System.out.println ("Server boot complete, listening port in" +port);


System.out.println ("Waiting for customer connections ...");


//Suspend waiting for customer's request


Socket connection=myscoket.accept ();


Test


System.out.println ("customer sends a connection request ...");


//Get the data stream to read the client


BufferedReader in=new BufferedReader (New InputStreamReader (Connection.getinputstream ()));


//Get the data output stream written to the client, true to automatically refresh


printwriter out=new PrintWriter (Connection.getoutputstream (), true);


//Send a welcome message to the customer


out.println ("Hello, server connection successful!") ");


out.println ("Enter bye disconnect from server");


Boolean done=false;


while (!done) {


//Read the contents of the client


String line=in.readline ();


if (line==null) {


done=true;


}else{


//Displays the information sent by the client from the server side


System.out.println ("Content from client" +line);


//Information processing


String message=process (line);


//Send message to Client


out.println ("Information sent from the server port" +message);


if (Line.trim (). Equals ("BYE"))


done=true;


　　　　　　 }


　　　　 }


//Turn off communication


Connection.close ();


}catch (Exception e) {


System.out.println (e);


　　 }


}


}


Package server;


public class Serverdemo {


　　 /**


* @param args


　　 */


public static void Main (string[] args) {


//TODO auto-generated method stub


if (args.length!=1) {


System.out.println ("Run as: Java Server < port number >");


return;


}


try{


//Get the port number


int port=integer.parseint (args[0]);


Server myserver=new Server (port);


}catch (Exception e) {


System.out.println (e);


}


　　 }


}