使用文件对话框打开和保存文件.java

java me的一些源码

/*
 * 使用文件对话框打开和保存文件.java
 *
 * Created on 2004年9月29日, 上午12:44
 */

/**
 *
 * @author  litertiger
 */
import java.io.*;
import java.awt.*;
import java.awt.event.*;

public class 使用文件对话框打开和保存文件 {
    
    /** Creates a new instance of 使用文件对话框打开和保存文件 */
    public 使用文件对话框打开和保存文件() {
    }
    
    public static void main(String args[]) {
        File_Dialog f=new File_Dialog();
    }    
    
}
class File_Dialog extends Frame implements ActionListener{

MenuBar mb;
Menu m;
MenuItem i,i2;
TextArea t1;
BufferedReader in;
FileReader fr;
FileWriter fw;
BufferedWriter out;
FileDialog f_l,f_s;
File_Dialog()
{
    super("带文件对话框的窗口");
    setSize(400,500);
    setVisible(true);
    mb=new MenuBar();
    m=new Menu("file");
    i=new MenuItem("open");
    i2=new MenuItem("save");
    i.addActionListener(this);
    i2.addActionListener(this);
    m.add(i);
    m.add(i2);
    mb.add(m);
    setMenuBar(mb);
    
    //下面来创建一个对话框
    f_l=new FileDialog(this,"open",FileDialog.LOAD);
    f_l.setVisible(false);
    f_s=new FileDialog(this,"save",FileDialog.SAVE);
    f_s.setVisible(false);
    f_s.addWindowListener(new WindowAdapter()
    {
        public void windowClosing(WindowEvent e)
        {
            f_s.setVisible(false);
        }
    });
    
        f_l.addWindowListener(new WindowAdapter()
    {
        public void windowClosing(WindowEvent e)
        {
            f_l.setVisible(false);
        }
    });
    addWindowListener(new WindowAdapter()
    {
        public void windowClosing(WindowEvent e)
        {
            setVisible(false);
            System.exit(0);
        }
    }
    );
    t1=new TextArea(10,10);
    t1.setBackground(Color.cyan);
    add(t1,"Center");
    
    
    
    
    
}

    public void actionPerformed(ActionEvent e) {
        
        if(e.getSource()==i)
        {
            f_l.setVisible(true);
            String s;
            try{
                File file=new File(f_l.getDirectory(),f_l.getFile());
                fr=new FileReader(file);
                in=new BufferedReader(fr);
                while((s=in.readLine())!=null)
                    t1.append(s+"\n");
            }
            catch(FileNotFoundException el)
            {
            
            }
            catch(IOException ioe){}
            try{
            in.close();
            fr.close();
            
            }
            catch(IOException ex){}
            }
        else if(e.getSource()==i2)
        {
            f_s.setVisible(true);
            try{
            File file=new File(f_l.getDirectory(),f_l.getFile());
            fw=new FileWriter(file);
            out=new BufferedWriter(fw);
            out.write(t1.getText(),0,(t1.getText()).length());
            out.flush();
            }
            catch(FileNotFoundException fnt){}
            catch(IOException edd){}
            }
        
        }
    }