Java implementation of network monitoring

Network//Tcpserver.java by Fpont 3/2000





//Usage:java tcpserver <port number>.


//default port is 1500.


//connection to is closed by client.


//This server handles only 1 connection.





import java.net.*;


import java.io.*;





public class TCPServer {





public static void Main (String args[]) {





int port;


ServerSocket Server_socket;


BufferedReader input;


try {


port = integer.parseint (Args[0]);


}


catch (Exception e) {


System.out.println ("port = 1500 (default)");


port = 1500;


}





try {


server_socket = new ServerSocket (port);


System.out.println ("Server Waiting for Client on port" +


Server_socket.getlocalport ());


//server infinite loop


while (true) {


Socket socket = server_socket.accept ();


System.out.println ("New connection accepted" +


socket.getinetaddress () +


":" + socket.getport ());


input = new BufferedReader (New InputStreamReader (Socket.getinputstream ()));


//Print received data


try {


while (true) {


String message = Input.readline ();


if (message==null) break;


System.out.println (message);


}


}


catch (IOException e) {


System.out.println (e);


}





//connection closed by client


try {


Socket.close ();


System.out.println ("Connection Closed by client");


}


catch (IOException e) {


System.out.println (e);


}


}


}


catch (IOException e) {


System.out.println (e);


}


}


}

















//Tcpclient.java by Fpont 3/2000





//Usage:java tcpclient <server> <port>


//default port is 1500





import java.net.*;


import java.io.*;





public class TcpClient {











public static void Main (string[] args) {





int port = 1500;


String Server = "localhost";


socket socket = NULL;


String linetobesent;


BufferedReader input;


printwriter output;


int ERROR = 1;





//Read arguments


if (args.length = = 2) {


server = Args[0];


try {


port = integer.parseint (args[1]);


}


catch (Exception e) {


System.out.println ("Server port = 1000 (default)");


port = 1500;


}


}











//Connect to server


try {


socket = new Socket (server, port);


System.out.println ("Connected with server" +


socket.getinetaddress () +


":" + socket.getport ());


}


catch (Unknownhostexception e) {


System.out.println (e);


System.exit (ERROR);


}


catch (IOException e) {


System.out.println (e);


System.exit (ERROR);


}











try {


input = new BufferedReader (new InputStreamReader (system.in));


output = new PrintWriter (Socket.getoutputstream (), true);





//Get user input and transmit it to server


while (true) {


linetobesent = Input.readline ();


//Stop if input line is "."


if (Linetobesent.equals (".")) break;


output.println (linetobesent);


}


}


catch (IOException e) {


System.out.println (e);


}





try {


Socket.close ();


}


catch (IOException e) {


System.out.println (e);


}


}


}