java简易编辑器

 package peng_jun;

 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;
 import javax.swing.event.*;
 import java.util.*;
 import java.io.*;
 import javax.swing.filechooser.*;
 import javax.swing.filechooser.FileFilter;
 import java.awt.datatransfer.*;

 public class Text extends JFrame {
     TextArea area;//文本域
     String name = null;//文件名
     String board = null;
     private Clipboard cb;//系统粘贴板

     Text() throws Exception {//构造函数
         setTitle("记事本");
         Toolkit kit = Toolkit.getDefaultToolkit();//Toolkit获得本机系统的屏幕的参数
         //Image img = kit.getImage("01.jpg");
         //setIconImage(img);

         JMenuBar jmb = new JMenuBar();//创建菜单条
         add(jmb);
         setJMenuBar(jmb);
         area = new TextArea();
         add(area);

         JMenu file = new JMenu("文件");//定义“文件”菜单项
         JMenuItem rebuild = new JMenuItem("新建");
         rebuild.setAccelerator(KeyStroke.getKeyStroke("ctrl N"));
         JMenuItem save = new JMenuItem("保存");
         save.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
         JMenuItem open = new JMenuItem("打开");
         open.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
         JMenuItem anotherSave = new JMenuItem("另存为");
         file.add(rebuild);
         file.add(save);
         file.add(open);
         file.add(anotherSave);
         // JScrollPane scroldPane=new JScrollPane(area); //设置滚动轴
         // add(scroldPane);
         JMenu edit = new JMenu("编辑");//定义“编辑”菜单项
         JMenuItem cut = new JMenuItem("剪切");
         cut.setAccelerator(KeyStroke.getKeyStroke("ctrl X"));
         JMenuItem copy = new JMenuItem("复制");
         copy.setAccelerator(KeyStroke.getKeyStroke("ctrl C"));
         JMenuItem plaster = new JMenuItem("粘贴");
         plaster.setAccelerator(KeyStroke.getKeyStroke("ctrl V"));
         JMenuItem all = new JMenuItem("全选");
         all.setAccelerator(KeyStroke.getKeyStroke("ctrl A"));
         edit.add(cut);
         edit.add(copy);
         edit.add(plaster);
         edit.add(all);
         JMenu help = new JMenu("帮助");//定义“帮助”菜单项
         JMenuItem about = new JMenuItem("关于");
         help.add(about);

         jmb.add(file);
         jmb.add(edit);
         jmb.add(help);
         setSize(, );
         //setLocation(300, 200);
         setVisible(true);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         cb = Toolkit.getDefaultToolkit().getSystemClipboard();//调用系统剪贴板
         save.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                 try {
                     saveText();
                 } catch (Exception ex) {
                 }
             }
         });
         open.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                 try {
                     openText();
                 } catch (Exception ex) {
                 }
             }
         });
         rebuild.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                 try {
                     area.setText("");
                     name = null;
                 } catch (Exception ex) {
                 }
             }
         });
         anotherSave.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
                 anotherSaveText();
             }
         });

         cut.addActionListener(new ActionListener() // 剪切
         {
             public void actionPerformed(ActionEvent e) {
                 board = area.getSelectedText();
                 cb.setContents(new StringSelection(board), null);
                 area.replaceRange("", area.getSelectionStart(),
                         area.getSelectionEnd());
             }
         });
         copy.addActionListener(new ActionListener() // 复制
         {
             public void actionPerformed(ActionEvent e) {
                 board = area.getSelectedText();
                 cb.setContents(new StringSelection(board), null);
             }
         });
         plaster.addActionListener(new ActionListener() // 粘贴
         {
             public void actionPerformed(ActionEvent e) {
                 try {
                     Transferable content = cb.getContents(null);
                     String st = (String) content
                             .getTransferData(DataFlavor.stringFlavor);
                     area.replaceRange(st, area.getSelectionStart(),
                             area.getSelectionEnd());
                 } catch (Exception ex) {
                 }
             }
         });
         all.addActionListener(new ActionListener() // 全选
         {
             public void actionPerformed(ActionEvent e) {
                 area.setSelectionStart();
                 area.setSelectionEnd(area.getText().length());
             }
         });
         about.addActionListener(new ActionListener() {//帮助
             public void actionPerformed(ActionEvent e) {
                 JFrame frame = new JFrame("关于");
                 frame.setSize(, );
                 frame.setLocation(, );
                 JTextArea area1 = new JTextArea("java简易文本编辑器");
                 frame.add(area1);
                 frame.setVisible(true);
             }
         });
     }

     public void openText() // 打开
     {
         JFileChooser chooser = new JFileChooser();
         FileNameExtensionFilter filter = new FileNameExtensionFilter("Files",
                 "txt", "java");
         chooser.setFileFilter(filter);
         chooser.setCurrentDirectory(new File("."));
         int result = chooser.showOpenDialog(Text.this);
         if (result == JFileChooser.APPROVE_OPTION) {
             name = chooser.getSelectedFile().getPath();
             setTitle(name);
             try {
                 BufferedReader in = new BufferedReader(new FileReader(name));
                 String line = null;
                 String datas = "";
                 while ((line = in.readLine()) != null) {
                     if (datas == "") {
                         datas = datas + line;
                     } else {
                         datas = datas + "\n" + line;
                     }
                 }
                 area.setText(datas);
                 in.close();
             } catch (Exception ex) {
             }
         }
     }

     public void saveText() // 保存
     {
         if (name == null) {
             JFileChooser chooser = new JFileChooser();
             FileNameExtensionFilter filter = new FileNameExtensionFilter(
                     "Files", "txt", "java");
             chooser.setFileFilter(filter);
             chooser.setCurrentDirectory(new File("."));
             int result = chooser.showSaveDialog(Text.this);
             if (result == JFileChooser.APPROVE_OPTION) {
                 name = chooser.getSelectedFile().getPath();
                 try {
                     OutputStream out = new FileOutputStream(name);
                     String datas = area.getText();
                     out.write(datas.getBytes());
                     out.close();
                 } catch (Exception ex) {
                 }
             }
         } else {
             try {
                 OutputStream out = new FileOutputStream(name);
                 String datas = area.getText();
                 out.write(datas.getBytes());
                 out.close();
             } catch (Exception ex) {
             }
         }
     }

     public void anotherSaveText() // 另存为
     {
         JFileChooser chooser = new JFileChooser();
         FileNameExtensionFilter filter = new FileNameExtensionFilter("Files",
                 "txt", "java");
         chooser.setFileFilter(filter);
         chooser.setCurrentDirectory(new File("."));
         int result = chooser.showSaveDialog(Text.this);
         if (result == JFileChooser.APPROVE_OPTION) {
             name = chooser.getSelectedFile().getPath();
             try {
                 OutputStream out = new FileOutputStream(name);
                 String datas = area.getText();
                 out.write(datas.getBytes());
                 out.close();
             } catch (Exception ex) {
             }
         }
     }

     public static void main(String[] args) throws Exception {
         new Text();
     }
 }