Java程序-记事本.doc

/*java.awt.是Java中的一个软件包 功能是包含用于创建用户界面和绘制图形图像的所有类*/import java.awt.CheckboxMenuItem;/*复选框类*/import java.awt.Container;/*容器类*/import java.awt.FileDialog;/*文件对话框*/import java.awt.FlowLayout;/*流式布局类；组件按照加入的先后顺序按照设置的对齐方式从左向右排列，一行排满到下一行开始继续排列*/import java.awt.GraphicsEnvironment;/*图形环境类*/import java.awt.Menu;/*菜单类*/import java.awt.MenuBar;/*菜单条类*/import java.awt.MenuItem;/*菜单项类*/import java.awt.MenuShortcut;import java.awt.TextArea;/*显示文本的多行区域类*/import java.awt.Window;import java.awt.Toolkit;/*java.awt.datatransfer也是java中的一个软件包，提供在应用程序之间和在应用程序内部传输数据的接口和类，它还提供一种剪贴板机制，程序中实现剪切、粘贴、复制功能时，都要用到这个包*/import java.awt.datatransfer.Clipboard;/*描述剪贴板的类*/import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.StringSelection;/*字符串选择类*/import java.awt.datatransfer.Transferable;import java.awt.datatransfer.UnsupportedFlavorException;/*java.awt.event.提供处理由 AWT 组件所激发的各类事件的接口和类*/import java.awt.event.ActionEvent;/*事件源类*/import java.awt.event.ActionListener;/*监视器类*/import java.awt.event.WindowAdapter;/*窗口适配器类*/import java.awt.event.KeyEvent;/按键事件类import java.awt.event.WindowEvent;/*窗口事件类*/*java.io.提供了全面的IO接口，包括：文件读写、标准设备输出，程序中文件新建、打开、保存都是调用该软件包中的类*/import java.io.BufferedReader;/*从字符输入流中读取文本，缓冲各个字符，从而实现字符、数组和行的高效读取。*/import java.io.BufferedWriter;/*将文本写入字符输出流，缓冲各个字符，从而提供单个字符、数组和字符串的高效写入。*/import java.io.File;/*文件和目录路径名的抽象表示形式*/import java.io.FileNotFoundException;/*容器类*/import java.io.FileReader;/*用来读取字符文件的便捷类*/import java.io.FileWriter;/*用来写入字符文件的便捷类*/import java.io.IOException;/*IO流异常类*/*/import java.util.logging.Level;import java.util.logging.Logger;/*javax.swing是一个用于开发Java应用程序用户界面的开发工具包*/import javax.swing.JButton;/按钮import javax.swing.JComboBox;import javax.swing.JDialog;/对话框import javax.swing.JFileChooser;/文件选择，打开、保存文件import javax.swing.JFrame;/框架，主程序窗口import javax.swing.JLabel;/标签import javax.swing.JOptionPane;/消息提示框import javax.swing.JPanel;/面板import javax.swing.JTextField;public class notebook / 记事本的具体实现类 private static final long serialVersionUID = 1L; private TextArea content; private String filePath = ;/先让路径为空 Toolkit toolKit = Toolkit.getDefaultToolkit(); Clipboard clipboard = toolKit.getSystemClipboard(); public notebook() /创建一个JFrame对象；并设置相关属性 final JFrame jf = new JFrame(TJP的记事本); jf.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); jf.setBounds(100,100,500,500); jf.setResizable(true); jf.setVisible(true); /创建菜单栏 MenuBar menu = new MenuBar(); jf.setMenuBar(menu); /创建并添加文本框 content = new TextArea(,50,50,TextArea.SCROLLBARS_VERTICAL_ONLY); jf.add(content); content.setVisible(true); content.requestFocusInWindow(); /菜单栏添加内容 Menu filemenu = new Menu(文件); Menu editmenu = new Menu(编辑); menu.add(filemenu); menu.add(editmenu); /创建文件菜单上的各个菜单项并添加到菜单上 MenuItem newitem = new MenuItem(新建); newitem.setShortcut(new MenuShortcut(KeyEvent.VK_N,false); filemenu.add(newitem); MenuItem openitem = new MenuItem(打开); openitem.setShortcut(new MenuShortcut(KeyEvent.VK_O,false); filemenu.add(openitem); MenuItem saveitem = new MenuItem(保存); saveitem.setShortcut(new MenuShortcut(KeyEvent.VK_S,false); filemenu.add(saveitem); MenuItem saveasitem = new MenuItem(另存为); saveasitem.setShortcut(new MenuShortcut(KeyEvent.VK_A,false); filemenu.add(saveasitem); /添加监听器来实现文件菜单上的各个菜单项的功能 /新建菜单项的功能实现 newitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) String con = content.getText(); if(!con.equals()/文本域里文本不为空 int result = JOptionPane.showConfirmDialog( null, (是否要保存？),(保存文件.),JOptionPane.YES_NO_CANCEL_OPTION); if(result = JOptionPane.NO_OPTION)/不保存 content.setText(); else if(result = JOptionPane.CANCEL_OPTION)/取消新建 else if(result = JOptionPane.YES_OPTION)/选择保存 JFileChooser jfc = new JFileChooser();/用于选择保存路径的文件名 int bcf = jfc.showSaveDialog(jf); if(bcf = JFileChooser.APPROVE_OPTION) try /保存文件 BufferedWriter bfw = new BufferedWriter( new FileWriter(new File(jfc.getSelectedFile().getAbsolutePath()+.txt); filePath = jfc.getSelectedFile().getAbsolutePath()+.txt;/获取文件保存的路径 bfw.write(con);/向文件写出数据 bfw.flush(); bfw.close();/关闭输出流 catch (IOException ex) Logger.getLogger(notebook.class.getName().log(Level.SEVERE, null, ex); new notebook();/新建文本文件 ); /打开菜单项的功能实现 openitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) FileDialog dialog = new FileDialog(new JFrame(),打开.,FileDialog.LOAD);dialog.setVisible(true);filePath = dialog.getDirectory() + dialog.getFile(); System.out.println(filePath);File file = new File(filePath);BufferedReader br = null;StringBuilder sb = new StringBuilder();trybr = new BufferedReader (new FileReader(file);String str = null;while (str = br.readLine() != null)sb.append(str).append(n);content.setText(sb.toString();catch(FileNotFoundException e1)e1.printStackTrace();catch(IOException e1)e1.printStackTrace();finallyif(br != null)trybr.close();catch(IOException e1)e1.printStackTrace(); ); /保存菜单项的功能实现 saveitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) FileDialog dialog = new FileDialog(new JFrame(),保存.,FileDialog.SAVE);dialog.setVisible(true);filePath = dialog.getDirectory() + dialog.getFile();if(filePath.equals()/没有路径时，就另存为 JFileChooser jfc = new JFileChooser();/用于选择保存路径的文件名 int bcf = jfc.showSaveDialog(jf);/弹出保存窗口 if(bcf = JFileChooser.APPROVE_OPTION) try /保存文件 BufferedWriter bfw = new BufferedWriter( new FileWriter(new File(jfc.getSelectedFile().getAbsolutePath()+.txt); filePath = jfc.getSelectedFile().getAbsolutePath(); bfw.write(content.getText();/向文件写出数据 bfw.flush(); bfw.close();/关闭输出流 catch (IOException ex) Logger.getLogger(notebook.class.getName().log(Level.SEVERE, null, ex); else/路径不为空时，保存在原来的路径下 try /保存文件 BufferedWriter bfw = new BufferedWriter( new FileWriter( new File(filePath); bfw.write(content.getText();/向文件写出数据 bfw.flush(); bfw.close();/关闭输出流 catch (IOException ex) Logger.getLogger(notebook.class.getName().log(Level.SEVERE, null, ex); ); /另存为菜单项的功能实现 saveasitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) JFileChooser jfc = new JFileChooser();/用于选择保存路径的文件名 int bcf = jfc.showSaveDialog(jf);/弹出保存窗口 if(bcf = JFileChooser.APPROVE_OPTION) try /保存文件 BufferedWriter bfw = new BufferedWriter( new FileWriter(new File(jfc.getSelectedFile().getAbsolutePath()+.txt); filePath = jfc.getSelectedFile().getAbsolutePath(); bfw.write(content.getText();/向文件写出数据 bfw.flush(); bfw.close();/关闭输出流 catch (IOException ex) Logger.getLogger(notebook.class.getName().log(Level.SEVERE, null, ex); ); /创建编辑菜单上的各个菜单项并添加到菜单上 MenuItem cutitem = new MenuItem(剪切); cutitem.setShortcut(new MenuShortcut(KeyEvent.VK_X,false); editmenu.add(cutitem); MenuItem copyitem = new MenuItem(复制); copyitem.setShortcut(new MenuShortcut(KeyEvent.VK_C,false); editmenu.add(copyitem); MenuItem pasteitem = new MenuItem(粘贴); pasteitem.setShortcut(new MenuShortcut(KeyEvent.VK_V,false); editmenu.add(pasteitem); MenuItem deleteitem = new MenuItem(删除); deleteitem.setShortcut(new MenuShortcut(KeyEvent.VK_DELETE,false); editmenu.add(deleteitem); editmenu.addSeparator(); MenuItem finditem = new MenuItem(查找); finditem.setShortcut(new MenuShortcut(KeyEvent.VK_F,false); editmenu.add(finditem); /添加监听器来实现编辑菜单上的各个菜单项的功能 /剪切菜单项的功能实现 cutitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) String text = content.getSelectedText();StringSelection selection = new StringSelection(text);clipboard.setContents(selection, null);if(text.length() = 0)return;elsecontent.replaceRange(, content.getSelectionStart(),content.getSelectionEnd(); ); /复制菜单项的功能实现 copyitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) String text = content.getSelectedText();StringSelection selection = new StringSelection(text);clipboard.setContents(selection, null); ); /粘贴菜单项的功能实现 pasteitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) Transferable contents = clipboard.getContents(this);String str =null;try str = (String) contents.getTransferData(DataFlavor.stringFlavor); catch (UnsupportedFlavorException e1) e1.printStackTrace(); catch (IOException e1) e1.printStackTrace();if (str = null)return;try content.replaceRange(str,content.getSelectionStart(),content.getSelectionEnd(); catch (Exception e1) e1.printStackTrace(); ); /删除菜单项的功能实现 deleteitem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) content.replaceRange(,content.getSelectionStart(),content.getSelectionEnd(); ); /查找菜单项的功能实现 finditem.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) final JDialog dialog = new JDialog(jf,查找字符串.,true);dialog.setBounds(560,250,310,130);JLabel find = new JLabel(请输入字符串 :);final JTextField findtext = new JTextField(1);JButton jbu = new JButton(查找);dialog.setLayout(null);find.setBounds(10,30,90,20);findtext.setBounds(100,30,90,20);jbu.setBounds(200,30,80,20);dialog.add(find);dialog.add(findtext);dialog.add(jbu);jbu.addActionListener(new ActionListener()public