notepad.java

java实现的超强记事本

				else
				{
					redoItem.setEnabled(false);
					redopopupItem.setEnabled(false);
					redoButton.setEnabled(false);
				}
			}
			
		});
		c.addMouseListener(new MouseAdapter() {
			public void mouseExited(MouseEvent e) {
				statuelabel.setText("状态栏");
			}
		});
		c.add(tool, BorderLayout.NORTH);
		c.add(scroller, BorderLayout.CENTER);
		c.add(statuelabel, BorderLayout.SOUTH);
		this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		this.setSize(800,600);// 760540
		this.setVisible(true);

	}

	// 事件处理
	public void actionPerformed(ActionEvent e) {
		// 新建
		if (e.getSource() == newItem || e.getSource() == newButton) {
			Object[] options = { "确定", "取消" };
			int s = JOptionPane.showOptionDialog(null, "请注意保存文档！按“确定”新建文件",
					"警告！", JOptionPane.DEFAULT_OPTION,
					JOptionPane.WARNING_MESSAGE, null, options, options[0]);
			if (s == JOptionPane.YES_OPTION) {
				text.setText("");
			}
			file = null;
		}
		// 打开
		if (e.getSource() == openItem || e.getSource() == openButton) {
			text.requestFocusInWindow();
			filechooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
			if (file != null)
				filechooser.setSelectedFile(file);
			// 文件过滤，见JAVAFileFilter类
			filechooser.addChoosableFileFilter(new JAVAFileFilter("txt"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("c"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("cpp"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("sql"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("doc"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("class"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("java"));
			filechooser.addChoosableFileFilter(new JAVAFileFilter("asm"));
			int returnVal = filechooser.showOpenDialog(notepad.this);
			if (returnVal == JFileChooser.APPROVE_OPTION) {
				file = filechooser.getSelectedFile();
				if (file == null || file.getName().equals(""))
					JOptionPane.showMessageDialog(this, "文件名错误", "错误",
							JOptionPane.ERROR_MESSAGE);
				else
					openFile(text);
				newfileFlag = false; // 设置为保存标志
				text.setCaretPosition(0);// 光标位置
			}
		}
		// 保存
		if (e.getSource() == saveItem || e.getSource() == saveButton) {
			text.requestFocusInWindow();
			saveFile(text);
		}
		// 另存为
		if (e.getSource() == saveasItem) {
			// 和保存的差别就在这个标志
			newfileFlag = true;
			saveFile(text);
		}
		// 页面设置，方便，JAVA提供的print方法
		if (e.getSource() == uniformItem) {
			text.requestFocusInWindow();
			try {
				text.print();
			} catch (PrinterException e1) {
				e1.printStackTrace();
			}
		}
		// 打印，这个原本想了半天，后来发现JTextPane可以用printDialog来调用系统的打印机
		if (e.getSource() == printItem) {
			prtMe.printDialog();
		}
		// 退出
		if (e.getSource() == exitItem) {
			text.requestFocusInWindow();
			quitProg();
		}
		// 撤销
		if (e.getSource() == undoItem || e.getSource() == undoButton
				|| e.getSource() == undopopupItem) {
			if (undo.canUndo())
				undo.undo();
		}
		// 重做
		if (e.getSource() == redoItem || e.getSource() == redoButton
				|| e.getSource() == redopopupItem) {
			if (undo.canUndo())
				undo.redo();
		}
		// 复制
		if (e.getSource() == copyItem || e.getSource() == copyButton
				|| e.getSource() == copypopupItem)
			text.copy();
		// 剪切
		if (e.getSource() == cutItem || e.getSource() == cutButton
				|| e.getSource() == cutpopupItem)
			text.cut();
		// 粘贴
		if (e.getSource() == pasteItem || e.getSource() == pasteButton
				|| e.getSource() == pastepopupItem)
			text.paste();
		// 删除
		if (e.getSource() == deleteItem || e.getSource() == deleteButton
				|| e.getSource() == deletepopupItem)
			text.replaceSelection("");
		// 查找
		if (e.getSource() == searchItem)
			search();
		// 替换
		if (e.getSource() == replaceItem)
			replace();
		// 全选
		if (e.getSource() == seleteAllItem
				|| e.getSource() == seleteAllpopupItem)
			text.selectAll();
		// 日期/时间
		if (e.getSource() == dateItem) {
			SimpleDateFormat TimeFormat = new SimpleDateFormat(
					" yyyy-MM-dd HH:mm:ss ");
			Calendar date = Calendar.getInstance();
			date = Calendar.getInstance(Locale.CHINESE); // 以上为获取系统当前的日期和时间
			text.setText(text.getText() + TimeFormat.format(date.getTime()));
		}
		// 背景颜色
		if (e.getSource() == colorItem || e.getSource() == colorButton
				|| e.getSource() == colorpopupItem) {
			Color ccc = JColorChooser.showDialog(this, "背景颜色", text
					.getBackground());
			if(ccc!=null)
			    text.setBackground(ccc);
		}
		// 字体设置
		if (e.getSource() == fontItem || e.getSource() == fontButton
				|| e.getSource() == fontpopupItem) {
			// 调用fontChooser
			fontChooser();
		}
		// 关于
		if (e.getSource() == aboutItem || e.getSource() == helpButton) {// 调用initabout()
			initabout();
		}
		//字数统计
		if (e.getSource() == countItem) {
			int bytecount, count,allbytecount,allcount;
			allbytecount = text.getText().getBytes().length;
			allcount = text.getText().length();
			if (text.getSelectedText() == null) {	
				JOptionPane.showMessageDialog(this, "字数统计 ：\n全文：" + "\n" + "字数： "
						+ allcount + " 个" + "\n" + "字节数：" + allbytecount + "个",
						"字数统计", JOptionPane.INFORMATION_MESSAGE);
			} 
			else {
				bytecount = text.getSelectedText().getBytes().length;
				count = text.getSelectedText().length();
				JOptionPane.showMessageDialog(this, "字数统计 ：\n全文："+"\n" + "字数： "
						+ allcount + " 个" + "\n" + "字节数：" + allbytecount + "个"+"\n您所选择的字段：" + "\n"
						+ "字数： " + count + " 个" + "\n" + "字节数：" + bytecount
						+ "个", "字数统计", JOptionPane.INFORMATION_MESSAGE);
			}
		}

	}

	/**
	 * 退出菜单的响应
	 */
	void quitProg() {
		int a = JOptionPane.showConfirmDialog(this, "文件已被改变，是否要保存？", "提示",
				JOptionPane.YES_NO_CANCEL_OPTION);
		if (a == 1) {
			this.dispose();
		} else if (a == 0) {
			// 保存文件的方法
			saveFile(text);
		}
		if (a == 2) {
		}
	}

	/**
	 * 保存文件的方法
	 * 
	 * @param text
	 */
	void saveFile(JTextPane text) {
		text.requestFocusInWindow();
		// 未保存的文件
		if (newfileFlag) {
			JFileChooser fileChooser = new JFileChooser();
			fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("txt"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("c"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("cpp"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("sql"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("doc"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("class"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("java"));
			fileChooser.addChoosableFileFilter(new JAVAFileFilter("asm"));
			fileChooser.setApproveButtonText("确定");
			fileChooser.setDialogTitle("另存为");
			int result = fileChooser.showSaveDialog(this);
			if (result == JFileChooser.CANCEL_OPTION) {
				return;
			}
			File saveFileName = fileChooser.getSelectedFile();
			if (saveFileName == null || saveFileName.getName().equals(""))
				JOptionPane.showMessageDialog(this, "文件名不合法", "错误",
						JOptionPane.ERROR_MESSAGE);
			else {
				try {
					FileWriter fw = new FileWriter(saveFileName);
					BufferedWriter bfw = new BufferedWriter(fw);
					bfw.write(text.getText(), 0, text.getText().length());
					bfw.flush();
					fw.close();
					newfileFlag = false;
					file = saveFileName;
					oldValue = text.getText();
				} catch (IOException ioException) {
				}
			}
		}
		// 文件已经保存
		else {
			try {
				FileWriter fw = new FileWriter(file);
				BufferedWriter bfw = new BufferedWriter(fw);
				bfw.write(text.getText(), 0, text.getText().length());
				bfw.flush();
				fw.close();
			} catch (IOException ioException) {
			}
		}
	}

	/**
	 * 打开文件的方法
	 * 
	 * @param text
	 */
	void openFile(JTextPane text) {
		try {
			FileReader fr = new FileReader(file);
			int len = (int) file.length();
			char[] buffer = new char[len];
			fr.read(buffer, 0, len);
			fr.close();
			text.setText(new String(buffer));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 初始化帮助的关于记事本，并且显示,包含记事本的信息
	 */
	public void initabout() {
		// 关于对话框标题图片
		// 帮助选项关于弹出对话框
		JDialog about = new JDialog(this);
		about.setLocationRelativeTo(this);
		Icon abouticon = new ImageIcon("image/about.gif");
		about.setTitle("关于记事本");
		about.setSize(410, 250);
		Container ca = about.getContentPane();
		ca.setBackground(Color.GRAY);
		ca.add(new JLabel(abouticon), BorderLayout.NORTH);
		JPanel panel = new JPanel();
		panel.setBackground(new Color(200, 200, 255));
		panel.setFont(new Font("", Font.BOLD, 18));
		JLabel label1 = new JLabel("记事本程序 Version2.01", SwingConstants.CENTER);
		JLabel label2 = new JLabel("制作者：许子彦", SwingConstants.CENTER);
		JLabel label3 = new JLabel("厦门大学软件学院软件工程系 06级", SwingConstants.CENTER);
		JLabel label4 = new JLabel("学号：24320062204504", SwingConstants.CENTER);
		JLabel label5 = new JLabel("个人制作，版权所有");
		// 设置BOX
		Box box1 = Box.createVerticalBox();
		box1.add(label5, SwingConstants.CENTER);
		box1.add(Box.createVerticalStrut(15)); // 两行的间距
		box1.add(label4, SwingConstants.CENTER);
		box1.add(Box.createVerticalStrut(15));
		box1.add(label3, SwingConstants.CENTER);
		box1.add(Box.createVerticalStrut(15));
		box1.add(label2, SwingConstants.CENTER);
		box1.add(Box.createVerticalStrut(15));
		box1.add(label1, SwingConstants.CENTER);
		panel.add(box1);
		ca.add(panel, BorderLayout.CENTER);
		about.setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
		// 显示
		about.show();
	}

	// 自动换行事件
	public void itemStateChanged(ItemEvent e2) {
		if (e2.getItemSelectable() == lineItem) {
			if (lineItem.getState()) {
				scroller
						.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
			} else
				scroller
						.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
		}
		if (e2.getItemSelectable() == statueItem) {
			if (statueItem.getState())
				statuelabel.setVisible(true);
			else
				statuelabel.setVisible(false);
		}
	}

	

	/**
	 * 处理查找的方法
	 */
	public void search() {
		final JDialog searchDia = new JDialog(this, "查找", true);
		searchDia.setLocationRelativeTo(this);
		searchDia.setSize(450, 200);
		// 这个设置可以在弹出对话框之后能回到文本编辑
		searchDia.setModalityType(Dialog.ModalityType.MODELESS);
		Container c = searchDia.getContentPane();
		GridLayout gridlayout = new GridLayout(2, 3);
		gridlayout.setHgap(10);
		gridlayout.setVgap(10);
		c.setLayout(gridlayout);
		JPanel labelpanel = new JPanel();
		JLabel label1 = new JLabel("查找内容(N)");
		labelpanel.add(label1);
		final JTextField field1 = new JTextField(20);
		JPanel fieldpanel = new JPanel();
		fieldpanel.add(field1);
		JPanel searchnextpanel = new JPanel();
		JButton searchnextButton = new JButton("查找下一个(F)");
		searchnextpanel.add(searchnextButton);
		JPanel checkpanel = new JPanel();
		final JCheckBox checkcase = new JCheckBox("区分大小写(C)");
		checkpanel.add(checkcase);
		ButtonGroup group = new ButtonGroup();
		final JRadioButton up = new JRadioButton("向上(U)");
		final JRadioButton down = new JRadioButton("向下(D)");
		down.setSelected(true);
		group.add(up);
		group.add(down);
		JPanel directionpanel = new JPanel();
		directionpanel.setBorder(BorderFactory.createTitledBorder("方向"));
		Box box = Box.createHorizontalBox();
		box.add(up);
		box.add(down);
		directionpanel.add(box);
		JPanel cancelpanel = new JPanel();
		// 下面"取消"前后有空格是使界面更好看，按钮对齐，下同
		JButton cancelButton = new JButton("        取消         ");
		cancelpanel.add(cancelButton);
		c.add(labelpanel);
		c.add(fieldpanel);
		c.add(searchnextpanel);
		c.add(checkpanel);
		c.add(directionpanel);
		c.add(cancelpanel);
		// 查找下一个按钮的事件
		searchnextButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int a = 0, b = 0;
				// 设置文本的初始位置
				int FindStartPos = text.getCaretPosition();