fileexport.java

一个应用timer的小程序

package net.sujee.javatimer;

import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;

import net.sujee.util.GenUtil;

public class FileExport extends JDialog implements ActionListener
{
   JButton buttonSave;
   JButton buttonClose;
   JTextArea textArea;
   JFileChooser fileChooser;
   Vector taskList;

   public FileExport (Frame parent, int width, int height)
   {
      super (parent, "Export Task Data");
      setSize(width, height);
      setModal(true);
      setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE);
      setLocationRelativeTo(parent);



      textArea = new JTextArea ();
      textArea.setEditable(false);
      textArea.setBorder( new TitledBorder(new EtchedBorder(
                   EtchedBorder.RAISED,Color.white,new Color(137, 137, 137)),"Task Export"));
      textArea.setAutoscrolls(true);
      JScrollPane scrollpane = new JScrollPane (textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                  JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

      buttonSave = new JButton ("Save to File...");
      buttonClose = new JButton ("Close");
      buttonSave.addActionListener(this);
      buttonClose.addActionListener(this);
      getContentPane().setLayout(new BorderLayout ());
      getContentPane().add (scrollpane, BorderLayout.CENTER);
      JPanel p1 = new JPanel ();
      p1.add (buttonSave);
      p1.add (buttonClose);
      getContentPane().add (p1, BorderLayout.SOUTH);

      fileChooser = new JFileChooser();
      fileChooser.setFileSelectionMode( JFileChooser.FILES_ONLY );
      fileChooser.setMultiSelectionEnabled( false );
      fileChooser.setDialogType(JFileChooser.SAVE_DIALOG);
      ExampleFileFilter filter = new ExampleFileFilter( "txt", "Text files" );
      fileChooser.addChoosableFileFilter( filter );

   }

   public void show (Vector taskList)
   {
      this.taskList = taskList;
      populateTextArea ();
      show ();
   }

   private void populateTextArea ()
   {
      int len = taskList.size();
      StringBuffer buf = new StringBuffer ();
      for (int i=0; i < len ; i++)
      {
         Task t = (Task) taskList.get(i);
         buf.append(t.dump() + GenUtil.NEWLINE);
      }
      textArea.setText(buf.toString());
   }
   public void actionPerformed(ActionEvent e)
   {
      Object src = e.getSource();
      if ( src == buttonClose)
      {
         hide ();
      }
      else if ( src == buttonSave)
      {
         int ret = fileChooser.showOpenDialog( this );
         if ( ret == JFileChooser.APPROVE_OPTION )
         {
            try
            {

            // if name doesn't end with .txt extension
            // set the extension
            File choosenFile = fileChooser.getSelectedFile();
            if ( !choosenFile.getName().endsWith( ".txt" ) )
               choosenFile = new File( fileChooser.getSelectedFile().getAbsolutePath() + ".txt" );

               FileWriter out = new FileWriter ( choosenFile);
               out.write("# Project Timer data export - " + new Date ().toString ());
               out.write(textArea.getText());
               out.close();
            }
            catch (Exception ex)
            {
               ex.printStackTrace();
            }
         }
      }
   }
}