awttest16.java

简单的记事本程序

import java.awt.*;
import java.awt.event.*;
import java.io.*;
 class ConfirmDialog extends Dialog implements ActionListener{
  private Button okay=new Button("Okay");
  private Button cancel=new Button("Cancel");
  private Label label=new Label("Are you sure?",Label.CENTER);
  public boolean isOkay=false;
  private class windowCloser extends WindowAdapter{
    public void windowClosing(WindowEvent we){
  	ConfirmDialog.this.isOkay=false;
  	ConfirmDialog.this.hide();
    }
  }	
  public ConfirmDialog(Frame parent){
  	this(parent,"Please confirm","Are you sure?");
  }
  public ConfirmDialog(Frame parent,String title,String question){
  	super(parent,title,true);
  	label.setText(question);
  	setup();
  	okay.addActionListener(this);
  	cancel.addActionListener(this);
  	addWindowListener(new windowCloser());
  	setResizable(false);
  	pack();show();
  }
  private void setup(){
  	Panel buttons=new Panel();
  	buttons.setLayout(new FlowLayout());
  	buttons.add(okay);buttons.add(cancel);
  	setLayout(new BorderLayout());
  	add("Center",label);add("South",buttons);
  }
  public void actionPerformed(ActionEvent ac){
  	isOkay=(ac.getSource()==okay);
  	hide();
  }
}
public class Awttest16 extends Frame implements ActionListener{
	private static String selected="";
   private static	String openfile=new String();
	private static 	String dir=new String();
	private MenuItem fnew=new MenuItem("New");
	private MenuItem fopen=new MenuItem("Open");
	private MenuItem fsave=new MenuItem("Save");
	private MenuItem fsaveas=new MenuItem("Save as");
	private MenuItem fexit=new MenuItem("Exit");
	private MenuItem copy=new MenuItem("Copy");
	private MenuItem paste=new MenuItem("Paste");
	private MenuItem delete=new MenuItem("Delete");
	private MenuItem about=new MenuItem("About");
	TextArea txt=new TextArea(50,25);
	public Awttest16(){
		super("简单文字编辑器");
		Menu file=new Menu("File");
		Menu edit=new Menu("Edit");
		Menu help=new Menu("Help");
		file.add(fnew);
		file.add(fopen);
		file.add(fsave);
		file.add(fsaveas);
		file.add(fexit);
		edit.add(copy);
		edit.add(paste);
		edit.add(delete);
		help.add(about);
		MenuBar bar=new MenuBar();
		bar.add(file);
		bar.add(edit);
		bar.add(help);
		setMenuBar(bar);
		add(txt);
                addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent we){
				System.exit(0);
			}
		});
		fnew.addActionListener(this);
		fopen.addActionListener(this);
		fsave.addActionListener(this);
		fsaveas.addActionListener(this);
		fexit.addActionListener(this);
		copy.addActionListener(this);
		paste.addActionListener(this);
		delete.addActionListener(this);
		about.addActionListener(this);
	}
	public void actionPerformed(ActionEvent e){
		if(e.getSource()==fnew){
			if(!txt.getText().equals("")){
		  	ConfirmDialog fnew=new ConfirmDialog(this,"新建文件","需要保存文件吗？");
			if(fnew.isOkay){
				{
			  String filetext=txt.getText();
			   FileDialog d=new FileDialog(this,"保存文件",FileDialog.SAVE);
			   d.setFile("*.txt");
			   d.setDirectory(".");
		       d.setVisible(true);
		       if(d.getFile()!=null){
		      String savefile=new String(d.getFile());
		       String savedir=new String(d.getDirectory());
		  try{
		  	byte[] b=filetext.getBytes();
		  	FileOutputStream out=new FileOutputStream(savedir+savefile);
		  	out.write(b);
		  }
		  catch(Exception ex){
		  	System.out.println(ex.toString());
		  }
		}
		}
			}
			}
			txt.setText("");
		}
		if(e.getSource()==fopen){
			FileDialog d=new FileDialog(this,"打开文件");
			d.setFile("*.txt");
			d.setDirectory(".");
			d.setVisible(true);
			if(d.getFile()!=null){
			try{openfile=d.getFile();
			    dir=d.getDirectory();
				byte[] b=new byte[2056];
				BufferedInputStream in=new BufferedInputStream(new FileInputStream(dir+openfile));
				int bytes=in.read(b,0,2056);
				String filetext=new String(b);
				txt.setText(filetext);
			}
			catch(Exception fne){System.out.println(fne.toString());
			}
		}
		}
		if(e.getSource()==fsave){
		  String filetext=txt.getText();
		  if(!openfile.equals("")){
		  try{
		  	byte[] b=filetext.getBytes();
		  	FileOutputStream out=new FileOutputStream(dir+openfile);
		  	out.write(b);
		  }
		  catch(Exception ex){
		  	System.out.println(ex.toString());
		  }
		  }
		  else
		    {String filetext1=txt.getText();
			   FileDialog d=new FileDialog(this,"保存文件",FileDialog.SAVE);
			   d.setFile("*.txt");
			   d.setDirectory(".");
		       d.setVisible(true);
		       if(d.getFile()!=null){
		      String savefile=new String(d.getFile());
		       String savedir=new String(d.getDirectory());
		  try{
		  	byte[] b=filetext1.getBytes();
		  	FileOutputStream out=new FileOutputStream(savedir+savefile);
		  	out.write(b);
		  }
		  catch(Exception ex){
		  	System.out.println(ex.toString());
		  }
		}
		} 
		  }
		if(e.getSource()==fsaveas){
			  String filetext=txt.getText();
			   FileDialog d=new FileDialog(this,"保存文件",FileDialog.SAVE);
			   d.setFile("*.txt");
			   d.setDirectory(".");
		       d.setVisible(true);
		       if(d.getFile()!=null){
		      String savefile=new String(d.getFile());
		       String savedir=new String(d.getDirectory());
		  try{
		  	byte[] b=filetext.getBytes();
		  	FileOutputStream out=new FileOutputStream(savedir+savefile);
		  	out.write(b);
		  }
		  catch(Exception ex){
		  	System.out.println(ex.toString());
		  }
		}
		}
		if(e.getSource()==fexit)
		  {	if(!txt.getText().equals("")){
		  	ConfirmDialog fnew=new ConfirmDialog(this,"新建文件","需要保存文件吗？");
			if(fnew.isOkay){
				{
			  String filetext=txt.getText();
			   FileDialog d=new FileDialog(this,"保存文件",FileDialog.SAVE);
			   d.setFile("*.txt");
			   d.setDirectory(".");
		       d.setVisible(true);
		       if(d.getFile()!=null){
		      String savefile=new String(d.getFile());
		       String savedir=new String(d.getDirectory());
		  try{
		  	byte[] b=filetext.getBytes();
		  	FileOutputStream out=new FileOutputStream(savedir+savefile);
		  	out.write(b);
		  }
		  catch(Exception ex){
		  	System.out.println(ex.toString());
		  }
		}
		}
    	}
			}
			System.exit(0); }
			if(e.getSource()==copy){
				selected=txt.getSelectedText();
	         }
	         if(e.getSource()==paste){
	         	int pos=txt.getCaretPosition();
	         	txt.insert(selected,pos);
	         }
	         if(e.getSource()==delete){
	         	String del=txt.getSelectedText();
	         	int delhead=txt.getCaretPosition();
	         	int delend=delhead+del.length();
	         	txt.replaceRange("",delhead,delend);
	         }
	         if(e.getSource()==about){
	         		ConfirmDialog fnew=new ConfirmDialog(this,"About对话框","本软件版权没有，欢迎翻版");
			if(fnew.isOkay){
			}
	         	
	         }
	}
	public static void main(String args[]){
		Awttest16 a=new Awttest16();
		a.setSize(400,400);
		a.setVisible(true);
	}
}