/* * 使用文件對話框打開和保存文件.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 使用文件對話框打開和保存文件 {        /** Creates a new instance of 使用文件對話框打開和保存文件 */    public 使用文件對話框打開和保存文件() {    }        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("帶文件對話框的窗口");    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);        //下面來創建一個對話框    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){}            }                }    }