notepad.java

基于FRAME的一个写字板的例子

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.awt.print.*;
import java.util.*;
public class notepad extends JFrame implements ActionListener,WindowListener
{
	int f = -1;
	int gposdel = 0;
	int gposcut = 0;
	String deltree="";
	String text="";
	
	PrinterJob printme = PrinterJob.getPrinterJob();
	
	MenuBar mb = new MenuBar();
	
	Menu file = new Menu("File");
	Menu edit = new Menu("Edit");
	Menu search = new Menu("Search");
	Menu help = new Menu("Help");
	
	MenuItem news = new MenuItem("New");
	MenuItem open = new MenuItem("Open");
	MenuItem save = new MenuItem("Save");
	MenuItem saveas = new MenuItem("Save As");
	MenuItem pgset = new MenuItem("Page Setup");
	MenuItem print = new MenuItem("Print");
	MenuItem exit = new MenuItem("Exit");
	
	MenuItem undo = new MenuItem("Undo");
	MenuItem cut = new MenuItem("Cut");
	MenuItem copy = new MenuItem("Copy");
	MenuItem paste = new MenuItem("Paste");
	MenuItem delete = new MenuItem("Delete");
	MenuItem selectall = new MenuItem("Select All");
	MenuItem td = new MenuItem("Time/Date");
	MenuItem font = new MenuItem("Set Font");
	CheckboxMenuItem wordrap = new CheckboxMenuItem("Word Rap");
	
	MenuItem find = new MenuItem("Find...");
	MenuItem findnext = new MenuItem("Find Next");
	
	MenuItem about = new MenuItem("About");
	MenuItem feat = new MenuItem("Features");
	
	String flag = "n";
	
	JPanel p1 = new JPanel();
	
	TextArea area = new TextArea(5,4);
	Font ver = new Font("Verdana",0,14);
	
	int gpos = 0;
	int spos = 0;
	
	String searchall;
	
	String filee = "";
	String directory = "";
	
	Date d = new Date();
	GregorianCalendar g = new GregorianCalendar();
	String stime;
	int hour=0;
	
	public void date()
	{
		hour = g.get(Calendar.HOUR);
		if (hour == 0)
		{
			hour = 12;
		}
		
		g.setTime(d);
		
		if ( g.get(Calendar.AM_PM) == 0 )
		{
			stime = hour + ":" + g.get(Calendar.MINUTE) + " AM " + (g.get(Calendar.MONTH)+1) + "/" + g.get(Calendar.DATE) + "/" + g.get(Calendar.YEAR);
		}
		if ( g.get(Calendar.AM_PM) == 1 )
		{
			stime = hour + ":" + g.get(Calendar.MINUTE) + " PM " + (g.get(Calendar.MONTH)+1) + "/" + g.get(Calendar.DATE) + "/" + g.get(Calendar.YEAR);
		}
		System.out.println("The Date/Time Is : " + stime);
		
	}
	
	public notepad()
	{
		setTitle("Nevpad Developed By Neville Mehta");
		setSize(600,400);
		setVisible(true);
		
		date();
		
		file.add(news);
		file.add(open);
		file.add(save);
		file.add(saveas);
		file.addSeparator();
		file.add(pgset);
		file.add(print);
		file.addSeparator();
		file.add(exit);
		news.addActionListener(this);
		open.addActionListener(this);
		save.addActionListener(this);
		saveas.addActionListener(this);
		pgset.addActionListener(this);
		print.addActionListener(this);
		exit.addActionListener(this);

		edit.add(undo);
		edit.addSeparator();
		edit.add(cut);
		edit.add(copy);
		edit.add(paste);
		edit.add(delete);
		edit.addSeparator();
		edit.add(selectall);
		edit.add(td);
		edit.addSeparator();
		edit.add(wordrap);
		edit.add(font);
		undo.addActionListener(this);
		cut.addActionListener(this);
		copy.addActionListener(this);
		paste.addActionListener(this);
		delete.addActionListener(this);
		selectall.addActionListener(this);
		td.addActionListener(this);
		wordrap.addItemListener(this);

		search.add(find);
		search.add(findnext);
		find.addActionListener(this);
		findnext.addActionListener(this);
	
		help.add(feat);
		help.addSeparator();
		help.add(about);
		about.addActionListener(this);
		feat.addActionListener(this);
		
		mb.add(file);
		mb.add(edit);
		mb.add(search);
		mb.add(help);
		
		
		setMenuBar(mb);
		
		area.setFont(ver);
		
		Container c = getContentPane();
		c.add(area);
		
		addWindowListener(this);
	}
	
	public void windowClosing(WindowEvent we)
	{
			System.out.println("Thank You For Using Nevpad");
			System.exit(0);
	}

	public void windowIconified(WindowEvent we)
	{
	}

	public void windowDeiconified(WindowEvent we)
	{
	}

	public void windowClosed(WindowEvent we)
	{
	}

	public void windowDeactivated(WindowEvent we)
	{
	}

	public void windowActivated(WindowEvent we)
	{
	}

	public void windowOpened(WindowEvent we)
	{
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if (e.getSource() == wordrap )
		{
			System.out.println(wordrap.getState());
			/*boolean agd = wordrap.getState();
			if (agd.equals(true))
			{
				System.out.println(wordrap.getState());
			}*/
		}
		
		area.setForeground(Color.black);
		area.setEditable(true);
		
		FileDialog fdopen = new FileDialog(this,"Open",FileDialog.LOAD);
		FileDialog fdsave = new FileDialog(this,"Save",FileDialog.SAVE);
		
		if (e.getSource() == feat)
		{
			String msg = "WELCOME TO NEVPAD DEVELOPED BY NEVILLE MEHTA" + "\n" + "\n" + "NEVPAD is exactly identical to the 'NOTEPAD' provided by 'WINDOWS'" + "\n" + "\n" + "Email all queries to : [e-mail]";
			
			area.setText(msg);
			area.setForeground(Color.blue);
			area.setEditable(false);
		}
		
		if (e.getSource() == td)
		{
			String text2=area.getSelectedText();
			
			if (text2.equals(""))
			{
				gposdel = area.getCaretPosition();
				area.insertText(stime,gposdel);
				f=3;
			}
			else
			{
				gposdel = area.getCaretPosition();
				int hg = area.getSelectionStart();
				int gh = area.getSelectionEnd();
				area.replaceRange(stime,hg,gh);
				f=3;
			}
		}
		
		
		if(e.getSource() == undo)
		{
			switch(f)
			{
				case 4:
				{
					//gposdel = area.getCaretPosition();
					//int del = ta.getText().indexOf(deltree);
					area.insert(stime,gposdel);
					f = 3;
					break;
				}
				
				case 3:
				{
					//gposdel = area.getCaretPosition();
					//int del = ta.getText().indexOf(deltree);
					area.replaceRange("",gposdel,gposdel+stime.length());
					
					f = 4;
					
					break;
				}
				
			case 1:
				{
					//gposdel = area.getCaretPosition();
					//int del = ta.getText().indexOf(deltree);
				
					
					area.insert(text,gposdel);
					f = 2;
					
					
					break;
				}
				
				case 2:
				{
					//gposdel = area.getCaretPosition();
					//int del = ta.getText().indexOf(deltree);
					area.replaceRange("",gposdel,gposdel+text.length());
					
					f = 1;
					
					break;
				}
				
				case -1:
				{
					//gposdel = area.getCaretPosition();
					//int del = ta.getText().indexOf(deltree);
					//area.replaceRange("",gposdel,gposdel+deltree.length());
					//area.replaceRange("",gposcut,gposcut+text.length());
					
					f = 1;
					text = area.getText();
					area.setText("");
					
					break;
				}
			}
		}
		
		
		if(e.getSource() == news)
		{
			area.setText("");
		}
		
		if(e.getSource() == print)
		{
			try
			{
			printme.print();
			}
			catch(Exception ew)
			{}
		}
		
		if(e.getSource() == pgset)
		{
			printme.printDialog();
		}
		
		if(e.getSource() == selectall)
		{
			area.selectAll();
		}
		
		if(e.getSource() == about)
		{
			JOptionPane.showMessageDialog(null,"Nevpad Vs.1.1 Developed By Neville Mehta" + "\n" + "Email me at - [e-mail]");
		}
		
		if (e.getSource() == exit)
		{
			System.out.println("Thank You For Using Nevpad");
			System.exit(0);
		}
		
		if (e.getSource() == save)
		{
			if (flag.equals("y"))
			{ 
			File delme = new File(directory,filee);
			
			String a = directory;
			String b = filee;
			try
			{
				delme.delete();
			}
			catch(SecurityException eeme)
			{
				System.out.println(eeme);
			}
			File filesaveit = new File(a,b);
			
			try
			{
				RandomAccessFile ram = new RandomAccessFile(a+b,"rw");
				//ram.seek(ram.length());
				String msh = area.getText();
				ram.writeBytes(msh);
				ram.close();
			}
			catch(Exception rt)
			{
				System.out.println(rt);
			}
			}
			
			if (flag.equals("n"))
			{
				fdsave.setVisible(true);
			String dir = fdsave.getDirectory();
			String fil = fdsave.getFile();
			File filesave = new File(dir,fil);
			
			try
			{
				RandomAccessFile ram = new RandomAccessFile(fdsave.getDirectory()+fdsave.getFile()+".txt","rw");
				ram.seek(ram.length());
				String msh = area.getText();
				ram.writeBytes(msh);
				ram.close();
			}
			catch(Exception rt)
			{
				System.out.println(rt);
			}
			}
		}
		
		if (e.getSource()==open)
		{
			flag = "y";
			fdopen.setVisible(true);
			filee = fdopen.getFile();
			directory = fdopen.getDirectory();
			File openfile = new File(directory,filee);
			
			try
			{
				RandomAccessFile ram2 = new RandomAccessFile(openfile,"rw");
				
				long size = ram2.length();
				String msg = "";
				
				for(int counter=0;counter<size;counter++)
				{
					char words = (char)ram2.read();
					msg = msg + words;
				}
				area.setText(msg);
				
			}
			catch(Exception e1)
			{
				System.out.println(e1);
			}
		}
		
		if (e.getSource() == saveas)
		{
			
			fdsave.setVisible(true);
			String dir = fdsave.getDirectory();
			String fil = fdsave.getFile();
			File filesave = new File(dir,fil);
			
			try
			{
				RandomAccessFile ram = new RandomAccessFile(fdsave.getDirectory()+fdsave.getFile()+".txt","rw");
				ram.seek(ram.length());
				String msh = area.getText();
				ram.writeBytes(msh);
				ram.close();
			}
			catch(Exception rt)
			{
				System.out.println(rt);
			}
		}
		
		if(e.getSource() == copy)
		{
			text = area.getSelectedText();
		}
		
		if(e.getSource() == paste)
		{
			if (text.equals(""))
			{
				gposdel = area.getCaretPosition();
				area.insertText(text,gposdel);
				f=2;
			}
			else
			{
				gposdel = area.getCaretPosition();
				int hg = area.getSelectionStart();
				int gh = area.getSelectionEnd();
				area.replaceRange(text,hg,gh);
				f=2;
			}
		}
		
		if(e.getSource() == delete)
		{
			f = 1;
			text = area.getSelectedText();
			gposdel = area.getCaretPosition();
			//int del = ta.getText().indexOf(deltree);
			area.replaceRange("",gposdel,gposdel+text.length());
			
			
		}
		
		if(e.getSource() == cut)
		{
			f = 1;
			text = area.getSelectedText();
			gposdel = area.getCaretPosition();
			//int del = ta.getText().indexOf(text);
			area.replaceRange("",gposdel,gposdel+text.length());
		}
		
		if(e.getSource() == find)
		{
			searchall = JOptionPane.showInputDialog("Enter The Word You Want To Search");
		}
	}
	
	public static void main(String args[])
	{
		notepad note = new notepad();
	}
	

}