📄 jprivatemessage.java
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import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import java.net.*;import java.io.*;public class JPrivateMessage extends JFrame implements ActionListener, KeyListener{ public String localname; public String remotename; private JEditorPane txtConversation = new JEditorPane(); // to be set on the JScrollPane private JTextArea txtSend = new JTextArea(); private JButton btnSend = new JButton("SEND"); private JScrollPane scrlConversation, scrlSend; private PrivateMessageListener listener; // used to detect the private messenger private JLabel lbConversation = new JLabel("Conversation Record"); private JPanel upperPane = new JPanel(); // used to include the lbConversation & scrlConversation private BoxLayout upperBox = new BoxLayout(upperPane, BoxLayout.Y_AXIS); private JLabel lbSend = new JLabel("Message to Send"); private JPanel sendPanel = new JPanel(); private JPanel lowerPane = new JPanel(); private BoxLayout sendBox = new BoxLayout(sendPanel, BoxLayout.X_AXIS); private BoxLayout lowerBox = new BoxLayout(lowerPane, BoxLayout.Y_AXIS); private JSplitPane splitV; // Components of save message function private JButton btnSave = new JButton("SAVE"); private JPanel btnPane = new JPanel(); private BoxLayout btnBox = new BoxLayout(btnPane, BoxLayout.Y_AXIS); // Prepare the script private String msgHeader ="<html><body>"; private String msgEnding = "</body></html>"; private String msg = ""; public JPrivateMessage(PrivateMessageListener l, String localUser, String remoteUser) { super("Private Messenger with "+remoteUser); listener = l; localname = localUser; remotename = remoteUser; // Configuration setup of the right upper part (conversation panel) txtConversation.setEditable(false); // Not allowed to edit the broadcast text area txtConversation.setContentType("text/html"); // using html format txtConversation.setText("<html><p style=\"font-family:verdana\">Welcome</p></html>"); scrlConversation = new JScrollPane(txtConversation); // set the JEditorPane in scrlConversation.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); scrlConversation.setPreferredSize(new Dimension(400,300)); scrlConversation.setMinimumSize(new Dimension(10,10)); upperPane.setLayout(upperBox); upperPane.add(lbConversation); upperPane.add(scrlConversation); // Configuration setup of the right lower part (text input area) scrlSend = new JScrollPane(txtSend); // set the TextArea in scrlSend.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); scrlSend.setPreferredSize(new Dimension(330,30)); scrlSend.setMinimumSize(new Dimension(10,10)); btnSend.setPreferredSize(new Dimension(70,30)); btnSend.setMinimumSize(new Dimension(10,10)); btnSave.setPreferredSize(new Dimension(70,30)); btnSave.setMinimumSize(new Dimension(10,10)); btnSend.addActionListener(this); // implements ActionListener btnSave.addActionListener(this); // to be implemented txtSend.addKeyListener(this); btnPane.setLayout(btnBox); btnPane.add(btnSend); btnPane.add(btnSave); sendPanel.setLayout(sendBox); sendPanel.add(scrlSend); sendPanel.add(btnPane); lowerPane.setLayout(lowerBox); lowerPane.add(lbSend); // JLabel lowerPane.add(sendPanel); splitV = new JSplitPane(JSplitPane.VERTICAL_SPLIT, upperPane, lowerPane); splitV.setOneTouchExpandable(false); splitV.setDividerLocation(300); splitV.setPreferredSize(new Dimension(400,400)); setContentPane(splitV); pack(); this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { listener.onClosePrivateMessage(remotename); } }); setVisible(true); } public void keyTyped(KeyEvent k){} public void keyReleased(KeyEvent k){} public void keyPressed(KeyEvent k) { if (k.getKeyCode() == KeyEvent.VK_ENTER) { if (txtSend.getText().length() > 0) // message cannot be sent without anything { String message = txtSend.getText().replaceAll("\n",""); listener.onSendMessage(remotename, message); if (message != "\n") addMessage("<p><b>" + localname + ": </b>" + message + "</p>"); txtSend.setText(""); // clear text area } } } public void actionPerformed(ActionEvent e) { if (e.getSource() == btnSend) { if (txtSend.getText().length() > 0) // message cannot be sent without anything { String message = txtSend.getText().replaceAll("\n",""); listener.onSendMessage(remotename, message); // Broadcasting if (message != "\n") addMessage("<p><b>" + localname + ": </b>" + message + "</p>"); // have problem? txtSend.setText(""); } } else if (e.getSource() == btnSave) { // testing //int len = txtConversation.getText().length(); //JOptionPane.showMessageDialog(null, len, "ER", JOptionPane.ERROR_MESSAGE); if (txtConversation.getText().length() > 92) { new JMessageSave(this, txtConversation); } else JOptionPane.showMessageDialog(null, "No Conversation!", "Save Error", JOptionPane.ERROR_MESSAGE); } } private void addMessage(String message) { msg += message; txtConversation.setText(msgHeader + msg + msgEnding); txtConversation.selectAll(); txtConversation.setCaretPosition(txtConversation.getSelectedText().length()); } public void revMessage(String message) { addMessage("<p><b>" + remotename + ": </b>" + message + "</p>"); } public void userLeft() { addMessage("<p><b>" + remotename + " has disconnected</b></p>"); btnSend.setEnabled(false); } }⌨️ 快捷键说明
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