// Course Number: COSC 650 Data Comm/Networks // Program Name: ChatLoginPanel // Project Number: 2 // Authors: Brian Hoffman // Mike McKinney // Javier Carrasco // Description: This class displays a login panel complete with server address, // server port, username, and status fields. The panel also holds // connect and cancel buttons. Upon filling in the appropriate // information and hitting the connect button, the client will // attempt to create a socket to the server and send an addClient // message. If unsuccessful, an error message will be diplayed in // the status field and the connected boolean variable will remain // false. If successful, the login panel will wait for the success // message, i.e. acceptClient, and save it for future use. It will // also set connected to true. The program making use of the login // panel should loop and keep checking the connected status using // the success() method. Once this method returns true, that // program should get the connection and the first message using // the getConnection() and getConnectMsg() methods. // // Java Core Packages import java.awt.*; import java.awt.event.*; import java.io.*; import java.net.*; // Jave Extension Packages import javax.swing.*; import javax.swing.border.*; public class ChatLoginPanel extends GriddedPanel { // private data private ClientConnection connection; private boolean connected = false; private ChatMessage connectMsg; public static final int DEFAULT_PORT = 6789; // GUI Components private GriddedPanel topPanel; private JLabel serverAddLabel; private JTextField serverAddField; private JLabel nicknameLabel; private JTextField nicknameField; private JLabel portLabel; private JTextField portField; private JButton connectButton; private JButton cancelButton; private JPanel statusPanel; private JTextField statusField; /** * ------------------------------------------------------------------------ * constructor - sets up the GUI * ------------------------------------------------------------------------ */ public ChatLoginPanel() { super(); // add label and field for getting server IP address topPanel = new GriddedPanel(); topPanel.setBorder(BorderFactory.createTitledBorder( BorderFactory.createEtchedBorder(), "Login / Connect", TitledBorder.LEFT, TitledBorder.TOP )); serverAddLabel = new JLabel("Enter Server Name or IP Address"); serverAddField = new JTextField(20); portLabel = new JLabel("Enter Port Number"); portField = new JTextField(Integer.toString(DEFAULT_PORT), 20); nicknameLabel = new JLabel("Enter Nickname or Chat Handle"); nicknameField = new JTextField(20); connectButton = new JButton("Connect"); connectButton.addActionListener(new connectButtonHandler()); cancelButton = new JButton("Cancel"); cancelButton.addActionListener(new cancelButtonHandler()); topPanel.addComponent(serverAddLabel, 1, 1, 2, 1); topPanel.addComponent(serverAddField, 2, 1, 2, 1); topPanel.addComponent(portLabel, 3, 1, 2, 1); topPanel.addComponent(portField, 4, 1, 2, 1); topPanel.addComponent(nicknameLabel, 5, 1, 2, 1); topPanel.addComponent(nicknameField, 6, 1, 2, 1); topPanel.addComponent(connectButton, 7, 1, 1, 1); topPanel.addAnchoredComponent(cancelButton, 7, 2, 1, 1, GridBagConstraints.EAST); addComponent(topPanel, 1, 1); //create status panel statusPanel = new JPanel(); statusPanel.setLayout(new BorderLayout()); statusPanel.setBorder(BorderFactory.createTitledBorder( BorderFactory.createEtchedBorder(), "Status", TitledBorder.LEFT, TitledBorder.TOP )); statusField = new JTextField(20); statusField.setEditable(false); statusPanel.add(statusField, BorderLayout.CENTER); addComponent(statusPanel, 2,1); // make the panel visible setVisible(true); } /** * ------------------------------------------------------------------------ * connectButtonHandler - handles presses of the connect button * ------------------------------------------------------------------------ */ private class connectButtonHandler implements ActionListener { public void actionPerformed(ActionEvent event) { if(!connected) { // read information from the GUI and create a connection String server = serverAddField.getText(); String name = nicknameField.getText(); int portNum = Integer.parseInt(portField.getText()); if ((name.length()==0) || (server.length()==0)) { JOptionPane.showMessageDialog(null, "Must enter nickname and server address.", "Login Error", JOptionPane.ERROR_MESSAGE); return; } statusField.setText("Connecting..."); connection = new ClientConnection(server, portNum, name); // check if the connection was successful if (!connection.connect()) { statusField.setText("Connection Failed"); } else { statusField.setText("Connection Succeeded"); } // send an addClient message to the server to see if it will // accept me with the given login name try { connection.sendMessage(new ChatMessage("addClient", name, "", "")); statusField.setText("Requesting Login ..."); // wait for the server to acknowledge and act appropriately based // upon the type of message returned. If it is anything other than // an accept message, the connection should be closed and the // status printed out connectMsg = connection.readMessage(); if (!connectMsg.getType().equals("acceptClient")) { statusField.setText("Server Refused Login"); connection.close(); connected = false; } else { statusField.setText("Server Accepted Login"); connected = true; } } // any exceptions at this point should abort the connection catch(Exception e) { connection.close(); connected = false; connectMsg = null; statusField.setText("Connection Lost: IO Error"); } // end catch } // end if } // end actionPerformed } // end class /** * ------------------------------------------------------------------------ * clearButtonHandler - handles presses of the clear button * ------------------------------------------------------------------------ */ private class cancelButtonHandler implements ActionListener { public void actionPerformed(ActionEvent event) { if (!connected) { serverAddField.setText(""); nicknameField.setText(""); statusField.setText("Disconnected"); } // end if } // end actionPerformed } // end class /** * ------------------------------------------------------------------------ * getConnection - accessor method that returns the connection * ------------------------------------------------------------------------ */ public ClientConnection getConnection() { return connection; } /** * ------------------------------------------------------------------------ * success - returns true if the panel has successfully created a connection * and false otherwise * ------------------------------------------------------------------------ */ public boolean success() { return connected; } /** * ------------------------------------------------------------------------ * getConnectMessage - accessor method that returns the server's connection * message that includes a list of the chatrooms that * are currently available * ------------------------------------------------------------------------ */ public ChatMessage getConnectMsg() { return connectMsg; } /** * ------------------------------------------------------------------------ * reset - resets the login panel so that it may be used again. This method * assumes that the connection has been read by some other program * that is responsible for maintaining it and any references to it * from here onward * ------------------------------------------------------------------------ */ public void reset() { // reset variables connected = false; connection = null; connectMsg = null; //reset GUI fields serverAddField.setText(""); nicknameField.setText(""); portField.setText(Integer.toString(DEFAULT_PORT)); statusField.setText(""); } }