记事本
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package a1;import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Font; import java.awt.GraphicsEnvironment; import java.awt.Insets; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import javax.swing.JCheckBoxMenuItem; import javax.swing.JColorChooser; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.undo.UndoManager; /** * swing 简单记事本 * @author kissy小强 * */ public class Note extends JFrame { private static final long serialVersionUID = 1L; UndoManager manager = new UndoManager(); JTextArea text = new JTextArea(); JFileChooser chooser; String s = "新建记事本"; int result = 0; private File file; JMenuBar Mb; JMenu M1, M2, M3, M4; JMenuItem m11, m12, m13, m14, m15, m21, m22, m23, m24, m25, m32, m33, m41; private final static int HEIGHT=450; private final static int WIDTH=750; JCheckBoxMenuItem m31 = new JCheckBoxMenuItem("自动换行", true); public static void main(String args[]) { String lookAndFeel = UIManager.getSystemLookAndFeelClassName(); try { UIManager.setLookAndFeel(lookAndFeel); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e1) { e1.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { Note n = new Note(); } catch (Exception e) { e.printStackTrace(); } } }); } public Note() { setTitle(s); setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); // 离显示屏上边缘x像素，里显示屏左边缘y像素 setLocation(screenSize.width / 2 - WIDTH / 2, screenSize.height / 2- HEIGHT / 2); setSize(WIDTH, HEIGHT); setResizable(true); // 窗体是否可变 setVisible(true); // 窗体是否可见 init(); } private void init(){ Mb = new JMenuBar(); this.setJMenuBar(Mb); text.getDocument().addUndoableEditListener(manager);// 设置文本框编辑监听（可撤销） text.setFont(new Font("宋体", Font.PLAIN, 14)); text.setCaretColor(Color.RED);// 光标颜色 text.setSelectedTextColor(Color.RED);// 选中字体颜色 text.setSelectionColor(Color.GREEN);// 选中背景颜色 text.setLineWrap(true); // 是否换行 text.setWrapStyleWord(true); // 是否单词边界换行（即有空白） text.setMargin(new Insets(3, 5, 3, 5));// 文本区与边框的间距，四个参数分别为上、左、下、右 text.setDragEnabled(true); // 开启或关闭自动拖动处理 add(new JScrollPane(text, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED)); M1 = this.AddBar("文件", Mb); M2 = this.AddBar("编辑", Mb); M3 = this.AddBar("格式", Mb); M4 = this.AddBar("帮助", Mb); /* 新建选项 */ m11 = this.AddItem("新建", M1); m11.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { text.setText(""); setTitle(s); file = null; } }); /* 打开选项 */ m12 = this.AddItem("打开", M1); m12.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { try { // 设置打开时的默认目录，两种方式 chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop"); // chooser.setCurrentDirectory(new File("C:\\Users\\xiaozhx\\Desktop")); chooser.setFileFilter(new filter()); result = chooser.showOpenDialog(null); if (result == JFileChooser.APPROVE_OPTION) { // 点击了打开按钮 file = chooser.getSelectedFile(); int length = (int) file.length(); FileReader reader = new FileReader(file); char[] ch = new char[length]; reader.read(ch); reader.close(); text.setText(new String(ch).trim()); setTitle(file.getName()); } else if (result == JFileChooser.CANCEL_OPTION) { // 点击了取消按钮 } } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } } }); /* 保存选项 */ m13 = this.AddItem("保存", M1); m13.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if (file == null) try { chooser = new JFileChooser("G:\\java大作战\test1"); chooser.setFileFilter(new filter()); result = chooser.showSaveDialog(null); if (result == JFileChooser.APPROVE_OPTION) { File selectfile = chooser.getSelectedFile(); // 获得文件名 // 获得被选中的过滤器中的文件扩展名 String end = chooser.getFileFilter().getDescription(); File newFile = null; if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) { // 如果文件是以选定扩展名结束的，则使用原名 newFile = selectfile; } else { // 否则加上选定的扩展名 newFile = new File(selectfile.getAbsolutePath()+ end); } try { if (newFile.exists() == false) { newFile.createNewFile(); } FileWriter writer = new FileWriter(newFile); char[] arry = text.getText().toCharArray(); writer.write(arry); writer.flush(); writer.close(); setTitle(newFile.getName()); file = newFile; } catch (IOException e) { } } else if (result == JFileChooser.CANCEL_OPTION) { // 点击了取消按钮 } } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } else try { FileWriter writer = new FileWriter(file); char[] arry = text.getText().toCharArray(); writer.write(arry); writer.flush(); writer.close(); } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } } }); /* 另存为选项 */ m14 = this.AddItem("另存为", M1); m14.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { try { chooser = new JFileChooser("C:\\Users\\xiaozhx\\Desktop"); chooser.setFileFilter(new filter()); result = chooser.showSaveDialog(null); if (result == JFileChooser.APPROVE_OPTION) { File selectfile = chooser.getSelectedFile(); // 获得文件名 // 获得被选中的过滤器中的文件扩展名 String end = chooser.getFileFilter().getDescription(); File newFile = null; if (selectfile.getAbsolutePath().toUpperCase().endsWith(end.toUpperCase())) { // 如果文件是以选定扩展名结束的，则使用原名 newFile = selectfile; } else { // 否则加上选定的扩展名 newFile = new File(selectfile.getAbsolutePath()+ end); } try { if (newFile.exists() == false) { newFile.createNewFile(); } FileWriter writer = new FileWriter(newFile); char[] arry = text.getText().toCharArray(); writer.write(arry); writer.flush(); writer.close(); setTitle(newFile.getName()); file = newFile; } catch (IOException e) { } } else if (result == JFileChooser.CANCEL_OPTION) { // 点击了取消按钮 } } catch (Exception e) { JOptionPane.showMessageDialog(null, e); } } }); M1.addSeparator(); // 横杆 /* 退出选项 */ m15 = this.AddItem("退出", M1); m15.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { System.exit(0); } }); /* 撤消选项 */ m21 = this.AddItem("撤消", M2); m21.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if (manager.canUndo()) manager.undo(); } }); /* 剪切选项 */ M2.addSeparator(); m22 = this.AddItem("剪切", M2); m22.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { text.cut(); } }); /* 复制选项 */ m23 = this.AddItem("复制", M2); m23.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { text.copy(); } }); /* 粘贴选项 */ m24 = this.AddItem("粘贴", M2); m24.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { text.paste(); } }); /* 删除选项 */ m25 = this.AddItem("删除", M2); m25.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { text.replaceRange("", text.getSelectionStart(), text.getSelectionEnd()); } }); /* 自动换行选项 */ M3.add(m31); m31.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { if (m31.getState()) text.setLineWrap(true); else text.setLineWrap(false); } }); /* 字体格式设置选项 */ m32 = this.AddItem("字体选择", M3); m32.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { GraphicsEnvironment ge = GraphicsEnvironment .getLocalGraphicsEnvironment(); //获取系统字体 JList<String> fontNames = new JList<String>(ge.getAvailableFontFamilyNames()); int response = JOptionPane.showConfirmDialog(null, new JScrollPane(fontNames), "请选择字体", JOptionPane.OK_CANCEL_OPTION); Object selectedFont = fontNames.getSelectedValue(); if (response == JOptionPane.OK_OPTION && selectedFont != null) text.setFont(new Font(fontNames.getSelectedValue() .toString(), Font.PLAIN, 20)); } }); /* 字体颜色设置选项 */ m33 = this.AddItem("字体颜色", M3); m33.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { Color color = JColorChooser.showDialog(null, "文字颜色选择", Color.WHITE); text.setForeground(color); } }); m41 = this.AddItem("关于记事本", M4); m41.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent event) { JOptionPane.showMessageDialog(null, "java记事本", "关于", JOptionPane.PLAIN_MESSAGE); } }); } /** 文件格式过滤器 **/ private class filter extends javax.swing.filechooser.FileFilter { public boolean accept(File file) { String name = file.getName(); name.toLowerCase(); if (name.endsWith(".txt") || file.isDirectory()) return true; else return false; } public String getDescription() { return ".txt"; } } /** 将菜单项JMenuItem添加到菜单JMenu **/ public JMenuItem AddItem(String name, JMenu menu) { JMenuItem MI = new JMenuItem(name); menu.add(MI); return MI; } /** 将菜单JMenu添加到菜栏JMenuBar **/ public JMenu AddBar(String name, JMenuBar mb) { JMenu Mb = new JMenu(name); mb.add(Mb); return Mb; } } 0 0
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