Java Chat (Server, Client Socket Connection)

Question

Assignment:
The assignment is to deliver two source codes that can run a Server (1) and Clients (2) in order to create a simpel chat program. The server has to wait and check an IP (localhost) + Port, and the client has to connect to that port and create a socket connection. The only thing that should be done is create a new socket connection for each client... and when a client sends a message, the message should be delivered to all clients connected to the server.
Problem...
However I can read an edit Java, it's difficult for me to write it. I allready found many turturials about socket connections on the internet, and tried to edit those, but they don't really do what I want unless I really write new shit. Is there a way you guys can help me with this, or that you find a really good website that fits my question?

Answer 1

According to me ,
take string variable 'str'
Take some class ,I think u already taken.....
Scoket scoket = new Socket(IP,port);
OutputStream out;
IInputStream in;
in = socket.getInputStream();
out = socket.getOutputStream();
If sends the msg then use
out.writeObject(str);
This line sends data to the other user
msg resivce from client then use
str = in.readInput();
& this str set to the any objects out put .
Such as TextField.setText(str);
//Server.class
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Server extends JFrame
          private JTextField enterdField;
          private JTextArea displayArea;
          private ObjectOutputStream output;
          private ObjectInputStream input;
          private ServerSocket server;
          private Socket connection;
          private int counter=1;
          public Server()
                    super("Server");
                    enterdField = new JTextField();
                    enterdField.setEditable(false);
                    enterdField.addActionListener(
                         new ActionListener()
                                   public void actionPerformed(ActionEvent event)
                                             sendData(event.getActionCommand());
                                             //System.out.println(event.getActionCommand());
                                             enterdField.setText("");
               add(enterdField,BorderLayout.NORTH);
               displayArea = new JTextArea();
               add(new JScrollPane(displayArea),BorderLayout.CENTER);
               setSize(300,150);
               setVisible(true);
          public void runServer()
                    try
                              server = new ServerSocket(12345,100);
                              while(true)
                                        try
                                                  waitForConnection();
                                                  getStreams();
                                                  processConnection();
                                        catch(EOFException eofexception)
                                                  displayMessage("\nServer terminated connection");
                                        finally
                                                  closeConnection();
                                                  counter++;
                    catch(IOException ioException)
                              ioException.printStackTrace();
          private void waitForConnection() throws IOException
                    displayMessage("Waiting for connection");
                    connection = server.accept();
                    //System.out.println(server.accept());
                    System.out.println(connection.getInetAddress());//Server Address and Hostname.
                    displayMessage("Connection"+counter +"received from :"+connection.getInetAddress().getHostName());
          private void getStreams() throws IOException
                    System.out.println("Start getStream");
                    output = new ObjectOutputStream(connection.getOutputStream());
                    output.flush();
                    input = new ObjectInputStream(connection.getInputStream());
                    displayMessage("\nGot I/O stream\n");
          private void processConnection() throws IOException //Read data from Client for Server.
                    String message="Connection sucessful To Client";
                    sendData(message);
                    int i=0;
                    setTextFieldEditable(true);
                    do
                              try
                                        message =(String) input.readObject();//For Client
                                        System.out.println("Input from :"+message);//From Client
                                        displayMessage("\n" + message);
                                        System.out.println("\n" + i++);
                              catch(ClassNotFoundException classnotfoundexception)
                                        displayMessage("\nUnknown object type recived");
                    while(!message.equals("CLIENT>>>TERMINATE"));
          private void closeConnection()
                    displayMessage("\nTeminating connection");
                    setTextFieldEditable(false);
                    try
                              output.close();
                              input.close();
                              connection.close();
                    catch(IOException ioException)
                              ioException.printStackTrace();
          private void sendData(String message)//Write data to the Client from the Server.
                    try
                              output.writeObject("SERVER>>>"+message);//For Client side.
                              System.out.println(message);
                              output.flush();
                              displayMessage("\nSERVER>>>"+message);//On server side.
                    catch(IOException ioException)
                              displayMessage("\nError writing object");
          private void displayMessage(final String messageToDisplay)
                    SwingUtilities.invokeLater(
                         new Runnable()
                              public void run()
                                        displayArea.append(messageToDisplay);
          private void setTextFieldEditable(final boolean editable)
                    SwingUtilities.invokeLater(
                         new Runnable()
                              public void run()
                                        enterdField.setEditable(editable);
          public static void main(String q[])
                    Server app = new Server();
                    app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    app.runServer();
//Client.class
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Client extends JFrame
     private JTextField enterField;
     private JTextArea displayArea;
     private ObjectOutputStream output;
     private ObjectInputStream input;
     private String message="";
     private String chatServer;
     private Socket client;
     public Client (String host)
               super("Client");
               chatServer=host;
               enterField = new JTextField();
               enterField.setEditable(false);
               enterField.addActionListener(
                    new ActionListener()
                              public void actionPerformed(ActionEvent event)
                                        sendData(event.getActionCommand());
                                        enterField.setText("");
                    add(enterField,BorderLayout.NORTH);
                    displayArea = new JTextArea();
                    add(new JScrollPane(displayArea),BorderLayout.CENTER);
                    setSize(300,150);
                    setVisible(true);
     public void runclient()
               try
                         connectToServer();
                         getStreams();
                         processConnection();
               catch(EOFException eofException)
                         displayMessage("\nClient treminated connection");
               catch(IOException ioException)
                         ioException.printStackTrace();
               finally
                         closeConnection();
     private void connectToServer() throws IOException
               displayMessage("Attempting connection\n");
               client = new Socket(InetAddress.getByName(chatServer),12345);
               displayMessage("Connect to:"+client.getInetAddress().getHostName());
     private void getStreams() throws IOException
               output = new ObjectOutputStream(client.getOutputStream());
               output.flush();
               input = new ObjectInputStream(client.getInputStream());
               //Thread t = new Thread(this,"Thread");
               //t.start();
               displayMessage("\nGot I/O stream\n");
     private void processConnection( ) throws IOException
               setTextFieldEditable(true);
               do
                         try
                                   message=(String)input.readObject();
                                   displayMessage("\n"+message);
                         catch(ClassNotFoundException classnotfoundexception)
                                   displayMessage("\nUnknown object type received");
               while(!message.equals("SERVER>>>TERMINATE"));
     private void closeConnection()
               displayMessage("\n Closing connection");
               setTextFieldEditable(false);
               try
                         output.close();
                         input.close();
                         client.close();
               catch(IOException ioException)
                         ioException.printStackTrace();
     private void sendData(String message)
               try
                         output.writeObject("CLIENT>>>"+message);
                         //System.out.println(message);
                         output.flush();
                         displayMessage("\nCLIENT>>>"+message);
               catch(IOException ioException)
                         displayArea.append("\n Error writing object");
     private void displayMessage(final String MessageToDisplay)
               SwingUtilities.invokeLater(
                    new Runnable()
                              public void run()
                                        displayArea.append(MessageToDisplay);
     private void setTextFieldEditable(final boolean editable)
               SwingUtilities.invokeLater(
                    new Runnable()
                              public void run()
                                        enterField.setEditable(editable);
     public static void main(String q[])
               Client app;
               if(q.length==0)
                         app = new Client("127.0.0.1");
               else
                         app = new Client(q[0]);
               app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               app.runclient();
Use this example .....
Give me reply.My method is correct or not
All the best