Java Socket Programming (Java Networking Tutorial)

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Java Socket Programming using swing. instant messaging program.

Server



  2. import java.io.*;
  3. import java.net.ServerSocket;
  4. import java.net.Socket;

  6. import javax.swing.*;

  8. import java.awt.*;
  9. import java.awt.event.*;
  10. public class server extends JFrame
  11. {
  12. private JTextField userText;
  13. private JTextArea chatWindow;
  14. private ObjectOutputStream output;
  15. private ObjectInputStream input;
  16. private ServerSocket servers;
  17. private Socket connection;

  19. public server()
  20. {
  21. super("Chat Messenger");
  22. userText=new JTextField();
  23. userText.setEditable(false);
  24. userText.addActionListener(
  25. new ActionListener(){
  26. public void actionPerformed(ActionEvent event){
  27. sendMessage(event.getActionCommand());
  28. userText.setText("");
  29. }
  30. }
  31. );
  32. add(userText,BorderLayout.NORTH);
  33. chatWindow=new JTextArea();
  34. chatWindow.setEditable(false);
  35. add(new JScrollPane(chatWindow));
  36. setSize(300,150);
  37. setVisible(true);
  38. }


  41. public void startRunning()
  42. {
  43. try{
  44. servers=new ServerSocket(6789,100);
  45. while(true)
  46. {
  47. try{
  48. waitForConnection();
  49. setupStreams();
  50. whileChatting();
  51. }catch(EOFException eofException)
  52. {
  53. showMessage("\n Server Ended the connection! ");
  54. }
  55. finally
  56. {
  57. closeCrap();
  58. }

  60. }
  61. }catch(IOException ioException)
  62. {
  63. ioException.printStackTrace();
  64. }
  65. }
  66. private void waitForConnection() throws IOException
  67. {
  68. showMessage("wating for someone for connect ....\n");
  69. connection=servers.accept();
  70. showMessage("Now Connected to "+connection.getInetAddress().getHostName());
  71. }
  72. private void setupStreams()throws IOException
  73. {
  74. output=new ObjectOutputStream(connection.getOutputStream());
  75. output.flush();
  76. input=new ObjectInputStream(connection.getInputStream());
  77. showMessage("\n Streams are now setup !!\n");
  78. }

  80. private void whileChatting()throws IOException
  81. {
  82. String message="Your are Connected!!!";
  83. sendMessage(message);
  84. ableToType(true);

  86. do
  87. {
  88.        try
  89.         {
  90. message=(String)input.readObject();
  91. showMessage("\n"+message);
  92.             }
  93.        catch(ClassNotFoundException classNotFoundException)
  94.        {

  96.        }

  98. }
  99. while(!message.equals("CLIENT - END"));
  100. }

  102. private void closeCrap()
  103. {
  104. showMessage("\n Clossing Connection!!!!!!!! \n");
  105. ableToType(false);
  106. try{
  107. output.close();
  108. input.close();
  109. connection.close();
  110. }catch(IOException ioException)

  112. {
  113. ioException.printStackTrace();
  114. }
  115. }

  117. private void sendMessage(String message)
  118. {
  119. try{
  120. output.writeObject("SERVER - "+ message);
  121. output.flush();
  122. showMessage("\n SERVER - " + message);
  123. }catch(IOException ioException)
  124. {
  125. chatWindow.append("\n your can't send Message");
  126. }
  127. }

  129. private void showMessage(final String text)
  130. {
  131. SwingUtilities.invokeLater(
  132.    new Runnable()
  133. {
  134.          public void run()
  135.           {
  136.     chatWindow.append(text);
  137.           }
  138. }
  139. );
  140. }


  143. private void ableToType(final boolean tof)
  144. {
  145. SwingUtilities.invokeLater(
  146.    new Runnable()
  147. {
  148.          public void run()
  149.           {
  150.    userText.setEditable(tof);
  151.           }
  152. }
  153. );
  154. }


  157. }

ServerTest


  1. import javax.swing.JFrame;
  2. public class ServerTest {
  3. public static void main(String[] args) {
  4. server sally=new server();
  5.          sally.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  6.          sally.startRunning();
  7. }

  9. }

Client


  1. import java.io.*;
  2. import java.net.*;
  3. import java.awt.*;
  4. import java.awt.event.*;
  5. import javax.swing.*;
  6. public class Client extends JFrame{

  8. private JTextField userText;
  9. private JTextArea chatWindow;
  10. private ObjectOutputStream output;
  11. private ObjectInputStream input;
  12. private String message="";
  13. private String serverIP;
  14. private Socket connection;

  16. public Client(String host)
  17. {
  18. super("Client ");
  19. serverIP=host;
  20. userText= new JTextField();
  21. userText.setEditable(false);
  22. userText.addActionListener(new ActionListener(){
  23. public void actionPerformed(ActionEvent event)
  24. {
  25. sendMessage(event.getActionCommand());
  26. userText.setText("");
  27. }
  28. });
  29. add(userText,BorderLayout.NORTH);
  30. chatWindow=new JTextArea();
  31. chatWindow.setEditable(false);
  32. add(new JScrollPane(chatWindow),BorderLayout.CENTER);
  33. setSize(300,150);
  34. setVisible(true);
  35. }

  37. public void startRunning()
  38. {
  39. try{
  40. connectToServer();
  41. setupStreams();
  42. whileChatting();
  43. }catch(EOFException eofException)
  44. {
  45. showMessage("\n Client Treminated connection !!!!!!");
  46. }catch(IOException ioException)
  47. {
  48. ioException.printStackTrace();
  49. }finally{
  50. closeCrap();
  51. }
  52. }

  54. private void connectToServer() throws IOException
  55. {
  56. showMessage(" Attempting Connection........\n");
  57. connection=new Socket(InetAddress.getByName(serverIP),6789);
  58. showMessage("Connected to : " +  connection.getInetAddress().getHostName());
  59. }


  62. private void setupStreams() throws IOException
  63. {
  64. output=new ObjectOutputStream(connection.getOutputStream());
  65. output.flush();
  66. input=new ObjectInputStream(connection.getInputStream());
  67. showMessage("\n your Message are Now good to go !!!!!!!!! \n");
  68. }

  70. private void whileChatting() throws IOException
  71. {
  72. ableToType(true);
  73. do{
  74. try{
  75. message=(String)input.readObject();
  76. showMessage("\n " + message);
  77. }catch(ClassNotFoundException classNotFoundException)
  78. {
  79. showMessage("\n Dont know the Object type ");
  80. }

  82. }while(!message.equals("SERVER - END"));

  84. }

  86. private void closeCrap()
  87. {
  88. showMessage("\n Closing crop down");
  89. ableToType(false);
  90. try{
  91. output.close();
  92. input.close();
  93. connection.close();
  94. }catch(IOException ioException)
  95. {
  96. ioException.printStackTrace();
  97. }
  98. }


  101. private void sendMessage(String message)
  102. {
  103. try{
  104. output.writeObject("CLIENT - " + message);
  105. output.flush();
  106. showMessage("\n CLIENT - " + message);
  107. }catch(IOException ioException)
  108. {
  109. chatWindow.append("\n Something messed up sending message Host !!!!!!");
  110. }
  111. }


  114. private void showMessage(final String m)
  115. {
  116. SwingUtilities.invokeLater(
  117. new Runnable(){
  118. public void run()
  119. {
  120. chatWindow.append(m);
  121. }
  122. });
  123. }
  124. private void ableToType(final boolean tof)
  125. {
  126. SwingUtilities.invokeLater(
  127. new Runnable(){
  128. public void run()
  129. {
  130. userText.setEditable(tof);
  131. }
  132. });
  133. }





  139. }

ClientTest


  1. import javax.swing.JFrame;
  2. public class ClientTest {
  3. public static void main(String[] args) {
  4. Client charlie;
  5. charlie=new Client("192.168.1.6");
  6. charlie.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  7. charlie.startRunning();

  9. }

  11. }


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