java编写文本编辑器.docx

import java.awt.BorderLayout;import java.awt.Dialog;import java.awt.FileDialog;import java.awt.Frame;import java.awt.GridLayout;import java.awt.Label;import java.awt.Menu;import java.awt.MenuBar;import java.awt.MenuItem;import java.awt.MenuShortcut;import java.awt.Panel;import java.awt.TextArea;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.io.BufferedReader;import java.io.BufferedWriter;public class TextEditor extends WindowAdapter implements ActionListener private Frame frame; private TextArea textarea; private String filename; public void createEditor() /建立文件菜单 MenuBar menubar=new MenuBar(); Menu menufile=new Menu(文件); MenuItem menunew=new MenuItem(新建,new MenuShortcut(KeyEvent.VK_N); menufile.add(menunew); MenuItem menuopen=new MenuItem(打开,new MenuShortcut(KeyEvent.VK_O); menufile.add(menuopen); MenuItem menusave=new MenuItem(保存,new MenuShortcut(KeyEvent.VK_S); menufile.add(menusave); menufile.add(另存为); menufile.addSeparator(); menufile.add(退出); menufile.addActionListener(this); menubar.add(menufile); /建立帮助菜单 Menu menuhelp=new Menu(帮助); menuhelp.add(关于); menuhelp.addActionListener(this); menubar.setHelpMenu(menuhelp); /主窗口 frame=new Frame(Java 文本编辑器); frame.setMenuBar(menubar); textarea=new TextArea(); frame.add(Center,textarea); frame.addWindowListener(this); frame.setSize(600,400); frame.setVisible(true); public void actionPerformed(ActionEvent e) try if(e.getActionCommand()=新建) textarea.setText(); else if(e.getActionCommand()=打开) FileDialog tefdopen=new FileDialog(frame,Open,0); tefdopen.setVisible(true); filename=tefdopen.getDirectory()+tefdopen.getFile(); /读取文件 FileReader fr=new FileReader(filename); BufferedReader br=new BufferedReader(fr); String str=; while(br.ready() int c=br.read(); str+=(char)c; textarea.setText(str); br.close(); fr.close(); frame.setTitle(Java 文本编辑器-+filename); else if(e.getActionCommand()=保存) /写入文件 File file=new File(filename); FileWriter fos=new FileWriter(file,true); BufferedWriter bos=new BufferedWriter(fos); PrintWriter pos=new PrintWriter(bos); pos.print(textarea.getText(); pos.close(); bos.close(); fos.close(); else if (e.getActionCommand()=另存为) FileDialog tefdopen=new FileDialog(frame,Open,0); tefdopen.setVisible(true); filename=tefdopen.getDirectory()+tefdopen.getFile(); File file=new File(filename); FileWriter fos=new FileWriter(file,true); BufferedWriter bos=new BufferedWriter(fos); PrintWriter pos=new PrintWriter(bos); pos.print(textarea.getText(); pos.close(); bos.close(); fos.close(); else if(e.getActionCommand()=退出) System.exit(0); else if(e.getActionCommand()=关于) final Dialog dialog=new Dialog(frame,关于,true); dialog.setSize(267,117); dialog.setLayout(new GridLayout(2,1); /窗口关闭事件 dialog.addWindowListener(new WindowAdapter() public void windowCloseing(WindowEvent e) dialog.dispose(); / dialog.setVisible(false); /Component.setVisible(false); ); Panel topPanel=new Panel(); Label label=new Label(Java 文本编辑器-王之隆); topPanel.add(label,BorderLayout.NORTH); dialog.add(topPanel); dialog.setVisible(true); catch (FileNotFoundExcepti