exam_5.zip_java_记事本

package jishiben; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JScrollPane; import java.awt.BorderLayout; import javax.swing.JFileChooser; import javax.swing.JOptionPane; import javax.swing.JTextField; import javax.swing.JMenuBar; import javax.swing.JMenu; import javax.swing.JScrollBar; import javax.swing.JMenuItem; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JTextArea; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; public class NotePad { private JFrame frame; private JTextArea textArea; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { NotePad window = new NotePad(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public NotePad() { initialize(); } private void initialize() { frame = new JFrame(); frame.setTitle("无标题_记事本"); frame.setBounds(100, 100, 440, 287); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JScrollPane scrollPane = new JScrollPane(); frame.getContentPane().add(scrollPane, BorderLayout.CENTER); textArea = new JTextArea(); scrollPane.setViewportView(textArea); JMenuBar menuBar = new JMenuBar(); frame.setJMenuBar(menuBar); JMenu mnFile = new JMenu("\u6587\u4EF6(F)"); menuBar.add(mnFile); JMenuItem mnnew = new JMenuItem("新建(N) Ctrl+N"); mnnew.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { int ret = JOptionPane.showConfirmDialog(null, "该文件的文字已改变，想保存文件吗？"); if(ret == JOptionPane.YES_OPTION) {//点击yes后要保存,再清空 JFileChooser qcn = new JFileChooser(); int ret1 = qcn.showSaveDialog(frame); if(ret1 ==qcn.APPROVE_OPTION ) { File out = qcn.getSelectedFile();//依然得到（系统自动）所选择的文件 try { FileWriter fw = new FileWriter(out);//输出流写文件 fw.write(textArea.getText()+"\r\n");//写入数据并换行 fw.close(); } catch (IOException e1) { e1.printStackTrace(); } } textArea.setText(null);//新建时不论是否保存都要清空文本框 } else if(ret == JOptionPane.NO_OPTION) { //textArea.removeAll();并未清空 textArea.setText(null); frame.setTitle("无标题_记事本"); } else { textArea.setText(textArea.getText()+"\r\n"); } } }); /*mnnew.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { JOptionPane.showConfirmDialog(null, "mouseClicked!"); } });点击鼠标新建并未反应*/ mnFile.add(mnnew); JMenuItem mnOpen = new JMenuItem("打开(O)... Ctrl+O"); mnOpen.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JFileChooser qcn = new JFileChooser(); int ret = qcn.showOpenDialog(frame);//显示打开文件选择窗体 textArea.setText(null);//在打开一个文件前应该清空文本框； if(ret == qcn.APPROVE_OPTION) { File curFile = qcn.getSelectedFile();//得到选择文件 //得到后（计算机）要输入选择文件 try { FileReader fr = new FileReader(curFile);//创建流读文件 BufferedReader br = new BufferedReader(fr);//创建流读数据 String q = br.readLine();//只能读一行,这样读取“丢掉”了源文件的换行符 while(q!=null) { String name = curFile.getName(); frame.setTitle(name); textArea.append(q+"\r\n");//记事本里换行 //textArea.setText(q);只读一行 q = br.readLine(); } //读完后流要关闭 br.close(); fr.close(); } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } } } }); mnFile.add(mnOpen); JMenuItem mnSave = new JMenuItem("保存(S) Ctrl+S"); mnSave.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JFileChooser qcn = new JFileChooser(); int ret1 = qcn.showSaveDialog(frame); if(ret1 ==qcn.APPROVE_OPTION ) { File out = qcn.getSelectedFile();//依然得到（系统自动）所选择的文件 try { FileWriter fw = new FileWriter(out); fw.write(textArea.getText()); fw.close(); String name = out.getName(); frame.setTitle(name); }catch (IOException e1) { e1.printStackTrace(); } } else if(ret1 == qcn.CANCEL_OPTION) { textArea.setText(textArea.getText()+"\r\n"); } } }); mnFile.add(mnSave); JMenuItem mnSaveAs = new JMenuItem("\u53E6\u5B58\u4E3A(A)..."); mnFile.add(mnSaveAs); JMenuItem mnPageRange = new JMenuItem("\u9875\u9762\u8BBE\u7F6E(U)..."); mnFile.add(mnPageRange); JMenuItem mnPrint = new JMenuItem("\u6253\u5370(P)... Ctrl+P"); mnFile.add(mnPrint); JMenuItem mnExit = new JMenuItem("\u9000\u51FA(X)"); mnFile.add(mnExit); JMenu mnedit = new JMenu("\u7F16\u8F91(E)"); menuBar.add(mnedit); JMenuItem mnBack = new JMenuItem("\u64A4\u9500(U) Ctrl+Z"); mnedit.add(mnBack); JMenuItem mnCut = new JMenuItem("\u526A\u5207(T) Ctrl+X"); mnedit.add(mnCut); JMenuItem mnCopy = new JMenuItem("\u590D\u5236(C) Ctrl+C"); mnedit.add(mnCopy); JMenuItem mnStick = new JMenuItem("\u7C98\u8D34(P) Ctrl+V"); mnedit.add(mnStick); JMenuItem mnDelete = new JMenuItem("\u5220\u9664(L) Del"); mnedit.add(mnDelete); JMenuItem mnSearch = new JMenuItem("\u67E5\u627E(F)... Ctrl+F"); mnedit.add(mnSearch); JMenuItem mnSearchNext = new JMenuItem("\u67E5\u627E\u4E0B\u4E00\u4E2A(N) F3"); mnedit.add(mnSearchNext); JMenuItem mnReplace = new JMenuItem("\u66FF\u6362(R)... Ctrl+H"); mnedit.add(mnReplace); JMenuItem mntmgCtrlg = new JMenuItem("\u8F6C\u5230(G)... Ctrl+G"); mnedit.add(mntmgCtrlg); JMenuItem mntmaCtrla = new JMenuItem("\u5168\u9009(A) Ctrl+A"); mnedit.add(mntmaCtrla); JMenuItem mntmNewMenuItem_7 = new JMenuItem("\u65F6\u95F4/\u65E5\u671F(D) F5"); mnedit.add(mntmNewMenuItem_7); JMenu mnformat = new JMenu("\u683C\u5F0F(O)"); menuBar.add(mnformat); JMenuItem mntmNewMenuItem_8 = new JMenuItem("\u81EA\u52A8\u6362\u884C(W)"); mnformat.add(mntmNewMenuItem_8); JMenuItem mntmf = new JMenuItem("\u5B57\u4F53(F)..."); mnformat.add(mntmf); JMenu mnlook = new JMenu("\u67E5\u770B(V)"); menuBar.add(mnlook); JMenuItem mntms = new JMenuItem("\u72B6\u6001\u680F(S)"); mnlook.add(mntms); JMenu mnhelp = new JMenu("\u5E2E\u52A9(H)"); menuBar.add(mnhelp); JMenuItem mntmh = new JMenuItem("\u5E2E\u52A9\u4E3B\u9898(H)"); mnhelp.add(mntmh); JMenuItem mntma = new JMenuItem("\u5173\u4E8E(A)"); mnhelp.add(mntma); } }