Server.java

package blog.socket.simple;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    private void server() {
        try {
            ServerSocket server = new ServerSocket(1994);
            System.out.println("Server is ready...");
            Socket socket = server.accept();
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    socket.getInputStream()));
            String request = br.readLine();
            if (request != null) {
                System.out.println("Received from a client: " + request);
                // Process: Select database, calculate...
                // Response to client
                PrintStream ps = new PrintStream(socket.getOutputStream());
                ps.println(request.toUpperCase());
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void main(String [] args){
        Server s = new Server();
        s.server();
    }
}