Java communication software design2(updating...)

Client Server Broadcasting String and Track the Client

 

Provider.java:

import java.io.*;import java.net.*;public class Provider{    ServerSocket providerSocket;    Socket connection = null;    ObjectOutputStream out;    ObjectInputStream in;    String message;    Provider(){}    void run()    {        try{            //1. creating a server socket            providerSocket = new ServerSocket(2004, 10);            //2. Wait for connection            System.out.println("Waiting for connection");            connection = providerSocket.accept();            System.out.println("Connection received from " + connection.getInetAddress().getHostName());            //3. get Input and Output streams            out = new ObjectOutputStream(connection.getOutputStream());            out.flush();            in = new ObjectInputStream(connection.getInputStream());            sendMessage("Connection successful");            //4. The two parts communicate via the input and output streams            do{                try{                        message = (String)in.readObject();                        System.out.println("client>" + message);                        if (message.equals("bye"))                                sendMessage("bye");                }                catch(ClassNotFoundException classnot){                        System.err.println("Data received in unknown format");                }            }while(!message.equals("bye"));        }        catch(IOException ioException){                ioException.printStackTrace();        }        finally{            //4: Closing connection            try{                    in.close();                    out.close();                    providerSocket.close();            }            catch(IOException ioException){                    ioException.printStackTrace();            }        }    }    void sendMessage(String msg)    {        try{                out.writeObject(msg);                out.flush();                System.out.println("server>" + msg);        }        catch(IOException ioException){                ioException.printStackTrace();        }    }    public static void main(String args[])    {        Provider server = new Provider();        while(true){                server.run();        }    }}

Requester.java:

 

import java.io.*;import java.net.*;public class Requester{    Socket requestSocket;    ObjectOutputStream out;    ObjectInputStream in;    String message;    Requester(){}    void run()    {        try{            //1. creating a socket to connect to the server            requestSocket = new Socket("localhost", 2004);            System.out.println("Connected to localhost in port 2004");            //2. get Input and Output streams            out = new ObjectOutputStream(requestSocket.getOutputStream());            out.flush();            in = new ObjectInputStream(requestSocket.getInputStream());            //3: Communicating with the server            do{                    try{                            message = (String)in.readObject();                            System.out.println("server>" + message);                            sendMessage("Hi my server, I am your Client");    sendMessage("I want to Send you some Data");    sendMessage("Please accept my Data through the Socket");    sendMessage("Thank you");                            message = "bye";                            sendMessage(message);                    }                    catch(ClassNotFoundException classNot){                            System.err.println("data received in unknown format");                    }            }while(!message.equals("bye"));        }            catch(UnknownHostException unknownHost){                    System.err.println("You are trying to connect to an unknown host!");            }            catch(IOException ioException){                    ioException.printStackTrace();            }            finally{                //4: Closing connection                try{                        in.close();                        out.close();                        requestSocket.close();                }                catch(IOException ioException){                        ioException.printStackTrace();                }            }    }    void sendMessage(String msg)    {        try{                out.writeObject(msg);                out.flush();                System.out.println("client>" + msg);        }        catch(IOException ioException){                ioException.printStackTrace();        }    }    public static void main(String args[])    {            Requester client = new Requester();            client.run();    }}

the testing result's printscreen: