notepad.java

类似Windows下的Notepad 并实现其他使用功能

package dazuoye;

import javax.swing.*;

import java.io.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.text.BadLocationException;
import java.awt.*;
import java.awt.event.*;

/**
 * @author wang xiaoling B04041413
 * 
 */
public class Notepad implements ActionListener {
	JMenuBar menubar;

	JMenu filemenu, editmenu, formatmenu, viewmenu, helpmenu;

	JMenuItem newitem, openitem, saveitem, saveasitem, exititem;

	JMenuItem undoitem, cutitem, copyitem, pasteitem, delitem, finditem,
			findnextitem, replaceitem, selallitem, timeitem, coloritem,
			fontitem, aboutitem;

	JCheckBoxMenuItem statusitem;

	JPopupMenu popupMenu;

	JMenuItem pcutitem, pcopyitem, ppasteitem, pdelitem, pselallitem,
			pcoloritem, pfontitem;

	JTextArea textArea;

	JLabel statusLabel;

	JFrame frame;

	JFileChooser chooser;

	JColorChooser c;

	FlowLayout layout;

	DocumentListener t;

	String temp[] = new String[2]; // 用于存储临时撤销前数据

	String filecontent = new String("");

	String findinput = new String();

	int findend = 0; // 上次查找结束标志

	int saveflag = 1; // 保存标志

	int newflag = 1;// 1可以新建,0不可新建

	/**
	 * 主程序的构造函数
	 */
	public Notepad() {
		frame = new JFrame("Notepad");
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) { // 对窗口关闭监听

				if (saveflag == 0) { // 是否保存对话框
					int d = JOptionPane.showConfirmDialog(frame, "文本已更改，是否保存?",
							"记事本", JOptionPane.YES_NO_CANCEL_OPTION,
							JOptionPane.WARNING_MESSAGE);
					if (d == JOptionPane.NO_OPTION) { // 选择不保存
						System.exit(0);
					} else if (d == JOptionPane.YES_OPTION) { // 选择保存
						int result = chooser.showSaveDialog(frame);
						if (result == JFileChooser.APPROVE_OPTION) { // 保存内容
							String str = textArea.getText();
							String filename = chooser.getSelectedFile()
									.toString(); // 获得文件保存的绝对路径
							try {
								String temp = new String();
								Scanner in = new Scanner(str);
								FileOutputStream out = new FileOutputStream(
										new File(filename));
								while (in.hasNextLine()) { // 是否还有下一行内容
									temp = in.nextLine() + "\t"; // 换行处理
									out.write(temp.getBytes()); // 向目标文件写数据
								}
								in.close();
								out.close();
							} catch (IOException ee) {

							}
						}
						System.exit(0);
					} else if (d == JOptionPane.CANCEL_OPTION) { // 放弃保存

					}
				} else
					System.exit(0); // 直接退出程序
			}
		});
		popupMenu = new JPopupMenu();
		chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File(".\\")); // 默认指定文件夹
		menubar = new JMenuBar();
		filemenu = new JMenu("File");
		filemenu.setMnemonic('F');

		newitem = new JMenuItem("New");
		newitem.setMnemonic('N');
		KeyStroke ks1 = KeyStroke.getKeyStroke(KeyEvent.VK_N,
				InputEvent.CTRL_MASK);
		newitem.setAccelerator(ks1);
		newitem.addMouseListener(new MouseAdapter() { // 为状态栏上显示作监听
					public void mouseEntered(MouseEvent e) { // 光标在上空时若状态栏可用则显示相应指示
						if (statusitem.getState() == true) // 状态栏已打开
							statusLabel.setText("Create a new file"); // 在状态栏显示相应提示信息
					}

					public void mouseExited(MouseEvent e) { // 光标离开该菜单
						if (statusitem.getState() == true) // 状态栏已打开
							statusLabel.setText("Status"); // 恢复
					}
				});
		newitem.addActionListener(new ActionListener() { // 监听新建功能
					public void actionPerformed(ActionEvent e) {
						if (newflag == 0) {
							int d = JOptionPane.showConfirmDialog(frame,
									"文本已更改，是否保存?", "记事本",
									JOptionPane.YES_NO_CANCEL_OPTION,
									JOptionPane.WARNING_MESSAGE);
							if (d == JOptionPane.NO_OPTION) {
								textArea.setText("");
								filecontent = "";
							} else if (d == JOptionPane.YES_OPTION) {
								int result = chooser.showSaveDialog(frame);
								if (result == JFileChooser.APPROVE_OPTION) {
									String str = textArea.getText();
									String filename = chooser.getSelectedFile()
											.toString();
									filename = chooser.getCurrentDirectory()
											.getName()
											+ filename;
									System.out.println(filename);
									try {
										String temp = new String();
										Scanner in = new Scanner(str);
										FileOutputStream out = new FileOutputStream(
												new File(filename));
										while (in.hasNextLine()) {
											temp = in.nextLine() + "\t";
											out.write(temp.getBytes());
										}
										in.close();
										out.close();
									} catch (IOException ee) {

									}
								}
							}
						} else {
							textArea.setText("");
							filecontent = "";
						}
					}
				});
		openitem = new JMenuItem("Open...");
		KeyStroke ks2 = KeyStroke.getKeyStroke(KeyEvent.VK_O,
				InputEvent.CTRL_MASK);
		openitem.setAccelerator(ks2);
		openitem.setMnemonic('O');
		openitem.addMouseListener(new MouseAdapter() { // 为状态栏上显示作监听
					public void mouseEntered(MouseEvent e) {
						if (statusitem.getState() == true)
							statusLabel.setText("Open an existed file");
					}

					public void mouseExited(MouseEvent e) {
						if (statusitem.getState() == true)
							statusLabel.setText("Status");
					}
				});
		openitem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int result = chooser.showOpenDialog(frame);
				try {
					if (result == JFileChooser.APPROVE_OPTION) {

						Scanner in = new Scanner(new FileReader(chooser
								.getSelectedFile()));

						String str = new String();
						str = in.nextLine();
						str = str + "\n";
						while (in.hasNextLine()) {
							str = str + in.nextLine();
							str = str + "\n";
						}
						textArea.setText(str);
						filecontent = str;
					}

				} catch (IOException ee) {
				}
			}
		});
		saveitem = new JMenuItem("Save");
		KeyStroke ks3 = KeyStroke.getKeyStroke(KeyEvent.VK_S,
				InputEvent.CTRL_MASK);
		saveitem.setAccelerator(ks3);
		saveitem.setMnemonic('S');
		saveitem.addMouseListener(new MouseAdapter() {
			public void mouseEntered(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Save current file");
			}

			public void mouseExited(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Status");
			}
		});
		saveitem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (saveflag == 0) {
					int result = chooser.showSaveDialog(frame);
					if (result == JFileChooser.APPROVE_OPTION) {
						String str = textArea.getText();
						String filename = chooser.getSelectedFile().toString();
						try {
							String temp = new String();
							Scanner in = new Scanner(str);
							FileOutputStream out = new FileOutputStream(
									new File(filename));
							while (in.hasNextLine()) {
								temp = in.nextLine() + "\t";
								out.write(temp.getBytes());
							}
						} catch (IOException ee) {

						}
						filecontent = textArea.getText();
						saveflag = 1;
						newflag = 0;
					}
				}
			}
		});
		exititem = new JMenuItem("Exit");
		exititem.setMnemonic('X');
		exititem.addMouseListener(new MouseAdapter() {
			public void mouseEntered(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Exit the Notepad");
			}

			public void mouseExited(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Status");
			}
		});
		exititem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (saveflag == 0) {
					int d = JOptionPane.showConfirmDialog(frame, "文本已更改，是否保存?",
							"记事本", JOptionPane.YES_NO_CANCEL_OPTION,
							JOptionPane.WARNING_MESSAGE);
					if (d == JOptionPane.NO_OPTION) {
						System.exit(0);
					} else if (d == JOptionPane.YES_OPTION) {
						int result = chooser.showSaveDialog(frame);
						if (result == JFileChooser.APPROVE_OPTION) {
							String str = textArea.getText();
							String filename = chooser.getSelectedFile()
									.toString();
							filename = chooser.getCurrentDirectory().getName()
									+ filename;
							try {
								String temp = new String();
								Scanner in = new Scanner(str);
								FileOutputStream out = new FileOutputStream(
										new File(filename));
								while (in.hasNextLine()) {
									temp = in.nextLine() + "\t";
									out.write(temp.getBytes());
								}
								in.close();
								out.close();
							} catch (IOException ee) {

							}
						}
						System.exit(0);
					} else if (d == JOptionPane.CANCEL_OPTION) {

					}
				} else
					System.exit(0);
			}
		});

		saveasitem = new JMenuItem("Save As...");
		saveasitem.setMnemonic('A');
		saveasitem.addMouseListener(new MouseAdapter() {
			public void mouseEntered(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Save current file as another");
			}

			public void mouseExited(MouseEvent e) {
				if (statusitem.getState() == true)
					statusLabel.setText("Status");
			}
		});
		saveasitem.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int result = chooser.showSaveDialog(frame);
				if (result == JFileChooser.APPROVE_OPTION) {
					String str = textArea.getText();
					String filename = chooser.getSelectedFile().toString();
					try {
						String temp = new String();
						Scanner in = new Scanner(str);
						FileOutputStream out = new FileOutputStream(new File(
								filename));
						while (in.hasNextLine()) {
							temp = in.nextLine() + "\t";
							out.write(temp.getBytes());
						}
					} catch (IOException ee) {

					}
					filecontent = textArea.getText();
					saveflag = 1;
				}
			}
		});