Java Swing简单文本编辑器

比眉伴天荒 2023-10-04 15:21 29阅读 0赞

import java.awt.BorderLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.InputEvent;
    import java.awt.event.KeyEvent;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileReader;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.swing.JEditorPane;
    import javax.swing.JFileChooser;
    import javax.swing.JFrame;
    import javax.swing.JMenu;
    import javax.swing.JMenuBar;
    import javax.swing.JMenuItem;
    import javax.swing.JOptionPane;
    import javax.swing.JScrollPane;
    import javax.swing.KeyStroke;
    import javax.swing.event.DocumentEvent;
    import javax.swing.event.DocumentListener;
    
    @SuppressWarnings("serial")
    public class Editor extends JFrame implements ActionListener, DocumentListener {
    
    	public static void main(String[] args) {
    		new Editor();
    	}
    
    	public JEditorPane textPane;
    	private JMenuBar menu;
    	private JMenuItem copy, paste, cut;
    	public boolean changed = false;
    	private File file;
    
    	public Editor() {
    		super("Editor");
    		setTitle("文本编辑器");
    		textPane = new JEditorPane();
    		getContentPane().add(new JScrollPane(textPane), BorderLayout.CENTER);
    		textPane.getDocument().addDocumentListener(this);
    
    		menu = new JMenuBar();
    		setJMenuBar(menu);
    		buildMenu();
    
    		setSize(500, 500);
    		setVisible(true);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	}
    
    	private void buildMenu() {
    		buildFileMenu();
    		buildEditMenu();
    	}
    
    	private void buildFileMenu() {
    		JMenu file = new JMenu("文件");
    		file.setMnemonic('F');
    		menu.add(file);
    		JMenuItem n = new JMenuItem("新建");
    		n.setMnemonic('N');
    		n.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_DOWN_MASK));
    		n.addActionListener(this);
    		file.add(n);
    		JMenuItem open = new JMenuItem("打开");
    		file.add(open);
    		open.addActionListener(this);
    		open.setMnemonic('O');
    		open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_DOWN_MASK));
    		JMenuItem save = new JMenuItem("保存");
    		file.add(save);
    		save.setMnemonic('S');
    		save.addActionListener(this);
    		save.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_DOWN_MASK));
    		JMenuItem saveas = new JMenuItem("另存为...");
    		saveas.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK | InputEvent.SHIFT_MASK));
    		file.add(saveas);
    		saveas.addActionListener(this);
    		JMenuItem 退出 = new JMenuItem("退出");
    		file.add(退出);
    		退出.addActionListener(this);
    		退出.setMnemonic('Q');
    		退出.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, InputEvent.CTRL_DOWN_MASK));
    	}
    
    	private void buildEditMenu() {
    		JMenu edit = new JMenu("编辑");
    		menu.add(edit);
    		edit.setMnemonic('E');
    		// cut
    		cut = new JMenuItem("剪切");
    		cut.addActionListener(this);
    		cut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_DOWN_MASK));
    		cut.setMnemonic('T');
    		edit.add(cut);
    		// copy
    		copy = new JMenuItem("复制");
    		copy.addActionListener(this);
    		copy.setMnemonic('C');
    		copy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.CTRL_DOWN_MASK));
    		edit.add(copy);
    		// paste
    		paste = new JMenuItem("粘贴");
    		paste.setMnemonic('P');
    		paste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, InputEvent.CTRL_DOWN_MASK));
    		edit.add(paste);
    		paste.addActionListener(this);
    		// find
    		JMenuItem find = new JMenuItem("查找");
    		find.setMnemonic('F');
    		find.addActionListener(this);
    		edit.add(find);
    		find.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_DOWN_MASK));
    		// select all
    		JMenuItem sall = new JMenuItem("选择全部");
    		sall.setMnemonic('A');
    		sall.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_DOWN_MASK));
    		sall.addActionListener(this);
    		edit.add(sall);
    	}
    
    	@Override
    	public void actionPerformed(ActionEvent e) {
    		String action = e.getActionCommand();
    		if (action.equals("退出")) {
    			System.exit(0);
    		} else if (action.equals("打开")) {
    			loadFile();
    		} else if (action.equals("保存")) {
    			saveFile();
    		} else if (action.equals("新建")) {
    			newFile();
    		} else if (action.equals("另存为...")) {
    			saveAs("另存为...");
    		} else if (action.equals("选择全部")) {
    			textPane.selectAll();
    		} else if (action.equals("复制")) {
    			textPane.copy();
    		} else if (action.equals("剪切")) {
    			textPane.cut();
    		} else if (action.equals("粘贴")) {
    			textPane.paste();
    		} else if (action.equals("查找")) {
    			FindDialog find = new FindDialog(this, true);
    			find.showDialog();
    		}
    	}
    
    	private void newFile() {
    		if (changed)
    			saveFile();
    		file = null;
    		textPane.setText("");
    		changed = false;
    		setTitle("Editor");
    	}
    
    	private void loadFile() {
    		JFileChooser dialog = new JFileChooser(System.getProperty("user.home"));
    		dialog.setMultiSelectionEnabled(false);
    		try {
    			int result = dialog.showOpenDialog(this);
    			if (result == JFileChooser.CANCEL_OPTION)
    				return;
    			if (result == JFileChooser.APPROVE_OPTION) {
    				if (changed)
    					saveFile();
    				file = dialog.getSelectedFile();
    				textPane.setText(readFile(file));
    				changed = false;
    				setTitle("Editor - " + file.getName());
    			}
    		} catch (Exception e) {
    			e.printStackTrace();
    			JOptionPane.showMessageDialog(null, e, "Error", JOptionPane.ERROR_MESSAGE);
    		}
    	}
    
    	private String readFile(File file) {
    		StringBuilder result = new StringBuilder();
    		try (FileReader fr = new FileReader(file); BufferedReader reader = new BufferedReader(fr);) {
    			String line;
    			while ((line = reader.readLine()) != null) {
    				result.append(line + "\n");
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    			JOptionPane.showMessageDialog(null, "Cannot read file !", "Error !", JOptionPane.ERROR_MESSAGE);
    		}
    		return result.toString();
    	}
    
    	private void saveFile() {
    		if (changed) {
    			int ans = JOptionPane.showConfirmDialog(null, "The file has changed. You want to save it?", "Save file",
    					JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE);
    			if (ans == JOptionPane.NO_OPTION)
    				return;
    		}
    		if (file == null) {
    			saveAs("Save");
    			return;
    		}
    		String text = textPane.getText();
    		System.out.println(text);
    		try (PrintWriter writer = new PrintWriter(file);) {
    			if (!file.canWrite())
    				throw new Exception("Cannot write file!");
    			writer.write(text);
    			changed = false;
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	private void saveAs(String dialogTitle) {
    		JFileChooser dialog = new JFileChooser(System.getProperty("user.home"));
    		dialog.setDialogTitle(dialogTitle);
    		int result = dialog.showSaveDialog(this);
    		if (result != JFileChooser.APPROVE_OPTION)
    			return;
    		file = dialog.getSelectedFile();
    		try (PrintWriter writer = new PrintWriter(file);) {
    			writer.write(textPane.getText());
    			changed = false;
    			setTitle("Editor - " + file.getName());
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		}
    	}
    
    	@Override
    	public void insertUpdate(DocumentEvent e) {
    		changed = true;
    	}
    
    	@Override
    	public void removeUpdate(DocumentEvent e) {
    		changed = true;
    	}
    
    	@Override
    	public void changedUpdate(DocumentEvent e) {
    		changed = true;
    	}
    
    }

import java.awt.GridLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    import javax.swing.JButton;
    import javax.swing.JCheckBox;
    import javax.swing.JDialog;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    
    @SuppressWarnings("serial")
    public class FindDialog extends JDialog implements ActionListener, KeyListener {
    
    	Editor parent;
    	JLabel label;
    	JTextField textField;
    	JCheckBox caseSensitive;
    	JButton find, close;
    	boolean finishedFinding = true;
    	Matcher matcher;
    
    	public FindDialog(Editor parent, boolean modal) {
    		super(parent, modal);
    		this.parent = parent;
    		getContentPane().addKeyListener(this);
    		getContentPane().setFocusable(true);
    		initComponents();
    		setTitle("查找");
    		setLocationRelativeTo(parent);
    		pack();
    	}
    
    	public void showDialog() {
    		setVisible(true);
    	}
    
    	private void initComponents() {
    		getContentPane().setLayout(new GridLayout(3, 1));
    		JPanel panel1 = new JPanel();
    		label = new JLabel("查找:");
    		label.setDisplayedMnemonic('F');
    		panel1.add(label);
    		textField = new JTextField(15);
    		panel1.add(textField);
    		label.setLabelFor(textField);
    		getContentPane().add(panel1);
    		JPanel panel2 = new JPanel();
    		caseSensitive = new JCheckBox("大小写敏感");
    		panel2.add(caseSensitive);
    		getContentPane().add(panel2);
    		JPanel panel3 = new JPanel();
    		find = new JButton("查找");
    		close = new JButton("关闭");
    		find.addActionListener(this);
    		close.addActionListener(this);
    		panel3.add(find);
    		panel3.add(close);
    		getContentPane().add(panel3);
    		textField.addKeyListener(this);
    		find.addKeyListener(this);
    		close.addKeyListener(this);
    		caseSensitive.addKeyListener(this);
    	}
    
    	private void find(String pattern) {
    		if (!finishedFinding) {
    			if (matcher.find()) {
    				int selectionStart = matcher.start();
    				int selectionEnd = matcher.end();
    				parent.textPane.moveCaretPosition(matcher.start());
    				parent.textPane.select(selectionStart, selectionEnd);
    			} else {
    				finishedFinding = true;
    				JOptionPane.showMessageDialog(this, "已到达文件末尾", "文件末尾", JOptionPane.INFORMATION_MESSAGE);
    				// closeDialog();
    			}
    		} else {
    			matcher = Pattern.compile(pattern).matcher(parent.textPane.getText());
    			finishedFinding = false;
    			find(pattern);
    		}
    	}
    
    	@Override
    	public void actionPerformed(ActionEvent e) {
    		String cmd = e.getActionCommand();
    		if (cmd.equals("查找")) {
    			String input = textField.getText();
    			StringBuilder pattern = new StringBuilder();
    			if (!caseSensitive.isSelected()) {
    				pattern.append("(?i)");
    			}
    			pattern.append(input);
    			find(pattern.toString());
    		} else if (cmd.equals("关闭")) {
    			closeDialog();
    		}
    	}
    
    	private void closeDialog() {
    		setVisible(false);
    		dispose();
    	}
    
    	@Override
    	public void keyTyped(KeyEvent e) {
    	}
    
    	@Override
    	public void keyPressed(KeyEvent e) {
    		// System.out.println(e.getKeyCode());
    		if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
    			closeDialog();
    		}
    	}
    
    	@Override
    	public void keyReleased(KeyEvent e) {
    	}
    
    }

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