Java-文本编辑器实现

圆号本昊

发布于 2021-09-24 14:42:09

7760

发布于 2021-09-24 14:42:09

文章被收录于专栏：github@hornhuanggithub@hornhuang

结构分析：

界面布局： EditFrame
main方法所在： EditText
打开功能实现： FileReadThread
保存跟能实现： save

实际运行效果：

附：完整代码实现

一、 EditFrame

包括一个菜单Menu

底部：日期时间

代码附上：

public class EditFrame extends JFrame {
	// TODO 自动生成的构造函数存根
	boolean saveFlag = false;
	File saveFileRoot = null;

	JFrame jFrame;
	JPanel jPanelSouth;
	JMenuBar jMenuBar1;
	JMenu jMenu1;
	JMenuItem jMenuItem1;
	JMenuItem jMenuItem2;
	JMenuItem jMenuItem3;
	JMenuItem jMenuItem4;
	JSeparator jSeparator1;
	JTextArea jTextArea;
	JScrollPane scrollPane;// 滚动条

	public EditFrame() {
		// TODO 自动生成的构造函数存根
		jFrame = new JFrame("水中鱼之1999-文本编辑器");
		jPanelSouth = new JPanel();
		jMenuBar1 = new JMenuBar();
		jMenu1 = new JMenu("文件");
		jMenuItem1 = new JMenuItem("打开");
		jMenuItem2 = new JMenuItem("保存");
		jMenuItem3 = new JMenuItem("另存为");
		jMenuItem4 = new JMenuItem("退出");
		jSeparator1 = new JSeparator();
		jTextArea = new JTextArea();
		scrollPane = new JScrollPane(jTextArea);

		jFrame.setSize(800, 500);
		jFrame.setLocationRelativeTo(null);
		jFrame.setVisible(false);

		
		setLayout();

		setSouthPanel();
		// set relationship for your component
		setRelationShip();
		// 设置 scrollPane for TextArea
		setScscrollPane();

		iniClick();
	}


	private void setRelationShip() {
		jFrame.add(BorderLayout.CENTER, scrollPane);
		jFrame.add(BorderLayout.SOUTH, jPanelSouth);
		jMenu1.add(jMenuItem1);
		jMenu1.add(jMenuItem2);
		jMenu1.add(jMenuItem3);
		jMenu1.add(jSeparator1);
		jMenu1.add(jMenuItem4);
		jMenuBar1.add(jMenu1);
		jFrame.setJMenuBar(jMenuBar1);
	}

	private void setLayout() {
		GridLayout gridLayout = new GridLayout(1, 2);
		jPanelSouth.setLayout(gridLayout);
	}

	private void setScscrollPane() {
//		jTextArea.setLineWrap(true);// 设置满一行自动换行
		scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
	}

	private void setSouthPanel() {
		// add time for SouthPanel
		JLabel jLabelDate = new JLabel("Date");
		JLabel jLabelTime = new JLabel("Time");
		Timer timeAction = new Timer(1000, new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				long timemillis = System.currentTimeMillis();
				// 转换日期显示格式
				SimpleDateFormat date = new SimpleDateFormat("yyyy 年 MM 月 dd 日 ");
				jLabelDate.setText("   当前日期：  " + date.format(new Date(timemillis)));
				SimpleDateFormat time = new SimpleDateFormat("HH:mm:ss ");
				jLabelTime.setText("   当前时间：  " + time.format(new Date(timemillis)));
			}
		});
		jPanelSouth.add(jLabelDate);
		jPanelSouth.add(jLabelTime);
		timeAction.start();
	}

	private void iniClick() {
		jFrame.addWindowListener(new WindowListener() {

			@Override
			public void windowOpened(WindowEvent e) {
				// TODO Auto-generated method stub

			}

			@Override
			public void windowIconified(WindowEvent e) {
				// TODO Auto-generated method stub

			}

			@Override
			public void windowDeiconified(WindowEvent e) {
				// TODO Auto-generated method stub

			}

			@Override
			public void windowDeactivated(WindowEvent e) {
				// TODO Auto-generated method stub

			}

			@Override
			public void windowClosing(WindowEvent e) {
				// TODO Auto-generated method stub
				int x = JOptionPane.showConfirmDialog(null, "确认退出么？", "友情提示", JOptionPane.OK_CANCEL_OPTION,
						JOptionPane.WARNING_MESSAGE);
				if (x == 0) {
					System.exit(0);
				}

			}

			@Override
			public void windowClosed(WindowEvent e) {
				// TODO Auto-generated method stub
			}

			@Override
			public void windowActivated(WindowEvent e) {
				// TODO Auto-generated method stub

			}
		});

		jMenuItem4.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				int x = JOptionPane.showConfirmDialog(null, "确认退出么？", "友情提示", JOptionPane.OK_CANCEL_OPTION,
						JOptionPane.WARNING_MESSAGE);
				if (x == 0) {
					System.exit(0);
				}
			}
		});

		jMenuItem1.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				FileReadThread fileReadThread = new FileReadThread(EditFrame.this);// 开启文件读取线程
				fileReadThread.start();
				System.out.println(saveFileRoot);
				saveFlag = true;
				jTextArea.setText("");
			}
		});

		jMenuItem3.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				Save save = new Save(EditFrame.this);
				save.start();
				saveFlag = true;
			}
		});

		jMenuItem2.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				if (!saveFlag) {
					Save save = new Save(EditFrame.this);
					save.start();
					saveFlag = true;
				} else {
					new Save(EditFrame.this, saveFileRoot);
				}
			}
		});
	}

	public JTextArea getjTextArea() {
		return jTextArea;
	}

	public void setjTextArea(JTextArea jTextArea) {
		this.jTextArea = jTextArea;
	}

	public File getSaveFileRoot() {
		return saveFileRoot;
	}

	public void setSaveFileRoot(File saveFileRoot) {
		this.saveFileRoot = saveFileRoot;
	}

	public JFrame getjFrame() {
		return jFrame;
	}

	public void setjFrame(JFrame jFrame) {
		this.jFrame = jFrame;
	}
}

二、测试类 EditText

分两部分：

1.闪屏由于加载页面需要时间原想用 SplashScreen 由于打包成jar包才能用所以这里用jframe进行替代

闪屏图片直接粘贴到：

2.new 一个EditFrame 对象，闪屏结束后设置为可见

public class EditText {
	public static void main(String[] args) {
		new Thread() {
			@Override
			public void run() {
				// TODO Auto-generated method stub
				EditFrame editFrame = new EditFrame();
				
				JFrame jFrame = new JFrame();
				JPanel jPanel = new javax.swing.JPanel(){
				    protected void paintComponent(java.awt.Graphics g){
				        super.paintComponent(g);
				        g.drawImage(new ImageIcon("experiment_bac.jpg").getImage(),0,0,400,250,null);
				    }
				};
				jFrame.add(jPanel);
				jFrame.setVisible(true);
				jFrame.setSize(400, 300);
				jFrame.setLocationRelativeTo(null);
				
				try {
					sleep(1500);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				jFrame.dispose();
				editFrame.getjFrame().setVisible(true);
			}
		}.start();
	}
}

三、FileReadThread

调用swing自带的 JFileChooser

选择文件路径

class FileReadThread extends Thread {
	private EditFrame test;
	
	public FileReadThread(EditFrame test ) {
		this.test = test;
	}

	@Override
	public void run() {
		JFileChooser chooser = new JFileChooser("d:/");
		chooser.setFileFilter(new FileFilter() {// 定义文件过滤器,仅显示文件夹和txt文本

			@Override
			public String getDescription() {
				return null;
			}

			@Override
			public boolean accept(File file) {
				if (file.isDirectory() || file.getName().endsWith(".txt"))
					return true;
				return false;
			}
		});
		int option = chooser.showOpenDialog(test);
		if (option == JFileChooser.APPROVE_OPTION) {
			File selFile = chooser.getSelectedFile();
			try {
				BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(selFile), "gbk"));
				test.setSaveFileRoot(selFile);
				String line = null;
				while ((line = reader.readLine()) != null) {
					test.getjTextArea().append(line + "\n");
					Thread.sleep(30);// 线程暂停,以看到读取过程效果
				}
			} catch (Exception e1) {
				e1.printStackTrace();
			}
			JOptionPane.showMessageDialog(test, "读取完毕");
		}

	}
}

四、save 保存

保存的调用分三种：

如果该文件是打开的那么保存到打开文件中
如果该文件还未保存这调用：进行保存
如果该文件已经另存为，则直接保存到另存为得的目录下

public class Save extends Thread {

	private EditFrame area;
	private File saveFileRoot = null;

	public Save(EditFrame area, File saveFileRoot) {
		System.out.println(saveFileRoot + "123");
		String text = area.getjTextArea().getText();
		String[] lines = text.trim().split("\n");
		try {
			PrintWriter out = new PrintWriter(new FileOutputStream(saveFileRoot), true);
			for (String line : lines)
				out.println(line);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public Save(EditFrame area) {
		this.area = area;
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setFileFilter(new FileFilter() {

			@Override
			public boolean accept(File f) {
				return f.getName().toLowerCase().endsWith(".txt");
			}

			@Override
			public String getDescription() {
				return "SAVE TO";
			}
		});
		int r = chooser.showSaveDialog(area);
		if (r != JFileChooser.APPROVE_OPTION)
			return;
		File f = chooser.getSelectedFile();
		area.setSaveFileRoot(f);
		String text = area.getjTextArea().getText();
		String[] lines = text.trim().split("\n");
		try {
			PrintWriter out = new PrintWriter(new FileOutputStream(f), true);
			for (String line : lines)
				out.println(line);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public File getSaveFileRoot() {
		return saveFileRoot;
	}

	public void setSaveFileRoot(File saveFileRoot) {
		this.saveFileRoot = saveFileRoot;
	}
}

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原始发表：2018-12-19 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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