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The EmailClient Class
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Now that the foundation has been laid by explaining each of E-mail Client s helper classes, we can look closely at the EmailClient class. The EmailClient class is responsible for creating and running E-mail Client s GUI as well as performing the communications with an e-mail server. EmailClient has a main( ) method, so on execution it will be invoked first. The main( ) method instantiates a new EmailClient object and then calls its show( ) method, which causes it to be displayed. After E-mail Client has been displayed on the screen, the connect( ) method is called to prompt the user for connection settings. The EmailClient class is shown here and examined in detail in the following sections. Notice that it extends JFrame.
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import import import import import import import import java.awt.*; java.awt.event.*; java.net.*; java.util.*; javax.mail.*; javax.mail.internet.*; javax.swing.*; javax.swing.event.*;
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// The E-mail Client. public class EmailClient extends JFrame { // Message table's data model. private MessagesTableModel tableModel;
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// Table listing messages. private JTable table; // This is the text area for displaying messages. private JTextArea messageTextArea; /* This is the split panel that holds the messages table and the message view panel. */ private JSplitPane splitPane; // These are the buttons for managing the selected message. private JButton replyButton, forwardButton, deleteButton; // Currently selected message in table. private Message selectedMessage; // Flag for whether or not a message is being deleted. private boolean deleting; // This is the JavaMail session. private Session session; // Constructor for E-mail Client. public EmailClient() { // Set application title. setTitle("E-mail Client"); // Set window size. setSize(640, 480); // Handle window closing events. addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { actionExit(); } }); // Set up File menu. JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); JMenuItem fileExitMenuItem = new JMenuItem("Exit", KeyEvent.VK_X); fileExitMenuItem.addActionListener(new ActionListener() {
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5: Implementing an E-mail Client in Java
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public void actionPerformed(ActionEvent e) { actionExit(); } }); fileMenu.add(fileExitMenuItem); menuBar.add(fileMenu); setJMenuBar(menuBar); // Set up buttons panel. JPanel buttonPanel = new JPanel(); JButton newButton = new JButton("New Message"); newButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionNew (); } }); buttonPanel.add(newButton); // Set up messages table. tableModel = new MessagesTableModel(); table = new JTable(tableModel); table.getSelectionModel().addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { tableSelectionChanged(); } }); // Allow only one row at a time to be selected. table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); // Set up E-mails panel. JPanel emailsPanel = new JPanel(); emailsPanel.setBorder( BorderFactory.createTitledBorder("E-mails")); messageTextArea = new JTextArea(); messageTextArea.setEditable(false); splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, new JScrollPane(table), new JScrollPane(messageTextArea)); emailsPanel.setLayout(new BorderLayout()); emailsPanel.add(splitPane, BorderLayout.CENTER); // Set up buttons panel 2. JPanel buttonPanel2 = new JPanel(); replyButton = new JButton("Reply"); replyButton.addActionListener(new ActionListener() {
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public void actionPerformed(ActionEvent e) { actionReply(); } }); replyButton.setEnabled(false); buttonPanel2.add(replyButton); forwardButton = new JButton("Forward"); forwardButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionForward(); } }); forwardButton.setEnabled(false); buttonPanel2.add(forwardButton); deleteButton = new JButton("Delete"); deleteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionDelete(); } }); deleteButton.setEnabled(false); buttonPanel2.add(deleteButton); // Add panels to display. getContentPane().setLayout(new BorderLayout()); getContentPane().add(buttonPanel, BorderLayout.NORTH); getContentPane().add(emailsPanel, BorderLayout.CENTER); getContentPane().add(buttonPanel2, BorderLayout.SOUTH); } // Exit this program. private void actionExit() { System.exit(0); } // Create a new message. private void actionNew () { sendMessage(MessageDialog.NEW, null); } // Called when table row selection changes. private void tableSelectionChanged() { /* If not in the middle of deleting a message, set the selected message and display it. */ if (!deleting) {
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5: Implementing an E-mail Client in Java
selectedMessage = tableModel.getMessage(table.getSelectedRow()); showSelectedMessage(); updateButtons(); } } // Reply to a message. private void actionReply() { sendMessage(MessageDialog.REPLY, selectedMessage); } // Forward a message. private void actionForward() { sendMessage(MessageDialog.FORWARD, selectedMessage); } // Delete the selected message. private void actionDelete() { deleting = true; try { // Delete message from server. selectedMessage.setFlag(Flags.Flag.DELETED, true); Folder folder = selectedMessage.getFolder(); folder.close(true); folder.open(Folder.READ_WRITE); } catch (Exception e) { showError("Unable to delete message.", false); } // Delete message from table. tableModel.deleteMessage(table.getSelectedRow()); // Update GUI. messageTextArea.setText(""); deleting = false; selectedMessage = null; updateButtons(); } // Send the specified message. private void sendMessage(int type, Message message) { // Display message dialog box to get message values. MessageDialog dialog;
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