java小程序记事本源代码

package com.niit.gui; import java.awt.FileDialog; import java.awt.Image; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JCheckBoxMenuItem; 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.JTextArea; public class NotePadDemo3 { /** * * 记事本3.0 * @param args */ public static void main(String[] args) { new NotePadFrame3(); } } class NotePadFrame3 extends JFrame { /** * */ private static final long serialVersionUID = 1L; private JMenuBar jMenuBar; private JMenu file, edit, ogetshi, view, help; private JMenuItem newFile, openFile, saveFile, saveAs, exit, paste, copy, delete, cut, replace,font,state,helpTheme,about; private JCheckBoxMenuItem autoWrap; private int response; private Image image; private Icon icon; private String fileName; private FileDialog openDialog; private FileDialog saveDialog; private JScrollPane jscrollPane; // 添加滚动条 private JTextArea jtextArea; // 记事本2.0 把JTextArea文本域直接放到JFrame中 //经试验还是把JTextArea放到JFrame中操作比较爽 public NotePadFrame3() { jtextArea = new JTextArea(); // 设置换行 jscrollPane = new JScrollPane(jtextArea); this.add(jscrollPane); openDialog = new FileDialog(this, "打开文件", FileDialog.LOAD); saveDialog = new FileDialog(this, "保存文件", FileDialog.SAVE); image = Toolkit.getDefaultToolkit().createImage( "src\\smile_naughty.gif"); icon = new ImageIcon(image); jMenuBar = new JMenuBar(); file = new JMenu("文件(F)"); //文件 newFile = new JMenuItem("新建(N)"); // 新建文件 //添加事件监听 以下类同 addListener(newFile); openFile = new JMenuItem("打开...(O)"); // 打开文件 addListener(openFile); saveFile = new JMenuItem("保存(S)"); // 保存文件 addListener(saveFile); saveAs = new JMenuItem("另存为...(A)"); // 另存为 addListener(saveAs); exit = new JMenuItem("退出(X)"); // 退出 addListener(exit); edit = new JMenu("编辑(E)"); // 编辑 copy = new JMenuItem("复制(C)"); // 复制 addListener(copy); cut = new JMenuItem("剪切(T)"); // 剪切 addListener(cut); paste = new JMenuItem("粘贴(P)"); // 粘贴 addListener(paste); delete = new JMenuItem("删除(L)"); // 删除 addListener(delete); replace = new JMenuItem("替换(R)"); // 替换 addListener(replace); ogetshi = new JMenu("格式(O)"); // 格式 autoWrap=new JCheckBoxMenuItem("自动换行(W)");//自动换行 addListener(autoWrap); font=new JMenuItem("字体(F)"); //字体 addListener(font); view = new JMenu("查看(V)"); // 查看 state=new JMenuItem("状态栏(S)"); addListener(state); help = new JMenu("帮助(H)"); // 帮助 helpTheme=new JMenuItem("帮助主题(H)"); addListener(helpTheme); about=new JMenuItem("关于记事本(A)"); addListener(about); file.add(newFile); file.add(openFile); file.add(saveFile); file.add(saveAs); file.addSeparator(); file.add(exit); edit.add(copy); edit.add(cut); edit.add(paste); edit.add(delete); edit.addSeparator(); edit.add(replace); ogetshi.add(autoWrap); ogetshi.add(font); view.add(state); help.add(helpTheme); help.addSeparator(); help.add(about); jMenuBar.add(file); jMenuBar.add(edit); jMenuBar.add(ogetshi); jMenuBar.add(view); jMenuBar.add(help); this.setJMenuBar(jMenuBar); //this.add(jMenuBar, new BorderLayout().NORTH); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setBounds(100, 100, 600, 600); this.setVisible(true); } // 添加事件监听方法 public void addListener(JMenuItem jmi) { jmi.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // 新建文件 if (e.getSource() == newFile) { fileName = null; jtextArea.setText(""); } // 打开文件 if (e.getSource() == openFile) { openDialog.setVisible(true);// openDialog.setFile("*.txt"); if (openDialog.getDirectory() != null) { fileName = openDialog.getDirectory()+ openDialog.getFile(); // 调用方法从文件读出数据 readFromFile(fileName); } } // 保存文件 if (e.getSource() == saveFile) { // saveDialog.setFile("*.txt"); if (fileName == null) { saveDialog.setVisible(true); // 得到文件名fileName fileName = saveDialog.getDirectory()+ saveDialog.getFile(); // 调用方法把数据写入文件 writeToFile(fileName); } else if (fileName != null) { writeToFile(fileName); } } // 另存为 if (e.getSource() == saveAs) { fileName = null; saveDialog.setVisible(true); fileName = saveDialog.getDirectory() + saveDialog.getFile(); if (fileName != null) { writeToFile(fileName); } } // 退出记事本 if (e.getSource() == exit) { response = JOptionPane.showConfirmDialog( NotePadFrame3.this, "文件内容已经改变是否保存", "退出对话框", JOptionPane.YES_NO_CANCEL_OPTION); //点击确定需要保存 if (response == 0) { saveDialog.setFile("*.txt"); saveDialog.setVisible(true); fileName = saveDialog.getDirectory()+ saveDialog.getFile(); writeToFile(fileName); } else if (response == 1) //点击否 不需要保存 { System.exit(response); } } // 复制 if(e.getSource()==copy) { jtextArea.copy(); } // 剪切 if(e.getSource()==cut) { jtextArea.cut(); } // 粘贴 if(e.getSource()==paste) { jtextArea.paste(); } // 删除 if(e.getSource()==delete) { jtextArea.cut(); } // 替换 if(e.getSource()==replace) { String newContent=JOptionPane.showInputDialog("要把选中内容替换为："); jtextArea.replaceSelection(newContent); } //格式 if(e.getSource()==autoWrap) { if(autoWrap.getState()) { jtextArea.setLineWrap(true); jtextArea.setWrapStyleWord(true); }else { jtextArea.setLineWrap(false); jtextArea.setWrapStyleWord(false); } } if(e.getSource()==font) { JOptionPane.showMessageDialog(NotePadFrame3.this, "No Font"); } if(e.getSource()==state) { JOptionPane.showMessageDialog(NotePadFrame3.this, "No State"); } if(e.getSource()==helpTheme) { JOptionPane.showMessageDialog(NotePadFrame3.this, "SOS~~~~"); } if(e.getSource()==about) { JOptionPane.showMessageDialog(NotePadFrame3.this, "NotePad 3.0"); } } }); } // 把记事本内容写入文件 public void writeToFile(String toFileName) { try { FileOutputStream fos = new FileOutputStream(fileName); byte[] content = jtextArea.getText().getBytes(); fos.write(content); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } } // 把文件读入记事本 public void readFromFile(String fromFileName) { try { FileInputStream fis = new FileInputStream(fromFileName); InputStreamReader isr = new InputStreamReader(fis); BufferedReader br = new BufferedReader(isr); while (br.ready()) { jtextArea.append(br.readLine()); jtextArea.append("\n"); } } catch (FileNotFoundException e) { e