Opening (and saving files)

This cant easily be done in Applets for security reasons. But its easy to do in applications. Here is an example of reading from a file.

/*
 * This is the starter code for paintbrush.
 * I have included 2 panels, put your tools all in the toolpanel.
 * If you want to change the size, change the dimensions included
 * 
 *
 * @author Jeff Borland
 * @updated 11-17-11
 */

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

import java.io.*;

public class PaintBrush extends JFrame implements MouseListener,ActionListener, MouseMotionListener
{
    JButton testButton=new JButton("test");
    JTextField testField=new JTextField(10);

    static private final String newline = "\n";
    JButton openButton=new JButton("open");
    JButton saveButton=new JButton("save");
    JTextArea log = new JTextArea(5,20);
    JFileChooser fc=new JFileChooser();;

    public void init()
    {
        JPanel toolPanel=new JPanel();
        //I create a toolpanel so you have tools lined up on the left. 
        // If you want to change it, change the dimension below, or see me
        toolPanel.setPreferredSize(new Dimension(130,430));
        toolPanel.setBorder(BorderFactory.createLineBorder(Color.black));
        toolPanel.setBackground(Color.green);

        //now I add my panel for drawing
        JPanel drawingPanel=new JPanel();
        drawingPanel.setPreferredSize(new Dimension(330,430));
        drawingPanel.setBackground(Color.blue);

        //add all your tools to the tool panel
        toolPanel.add(testButton);        
        toolPanel.add(testField);
        testButton.addActionListener(this);  

        Container screen= getContentPane();
        screen.setLayout (new FlowLayout() );

        //now we add the panels to the screen
        screen.add(toolPanel);
        screen.add(drawingPanel);

        addMouseListener(this);
        addMouseMotionListener(this);

        openButton.addActionListener(this);
        saveButton.addActionListener(this);
        drawingPanel.add(log);
        toolPanel.add(openButton);
        toolPanel.add(saveButton);

    }

    public void paint (Graphics g)
    {
        super.paint(g);

    }

    //when someone presses the mouse button
    public void mousePressed(MouseEvent e)
    {       

    }

    //when someone releases the mouse button
    public void mouseReleased(MouseEvent e)
    {       

    }

    // when the mouse enters the applet
    public void mouseEntered(MouseEvent e)
    {       

    }

    //when the mouse leaves the applet
    public void mouseExited(MouseEvent e)
    {       

    }

    //when the mouse button is clicked
    public void mouseClicked(MouseEvent e)
    {

    }

    //the mouse button is pressed and the mouse makes a significantly large movement
    public void mouseDragged(MouseEvent e)
    {

        int x=e.getX();
        int y=e.getY();
        Graphics g = getGraphics();
        g.fillOval(x,y,25,25);   
    }

    //the mouse makes a significantly large movement
    public void mouseMoved(MouseEvent e)
    {

    }    

    public void actionPerformed(ActionEvent thisEvent)
    {
        Object source = thisEvent.getSource();
        if (source == testButton)
        {

            testField.setText("test");
        }
        //now have if statements seeing finding out where the action occured

        if (source == openButton) {
            int returnVal = fc.showOpenDialog(this);

            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();

                try{
                    // Open the file that is the first 
                    // command line parameter
                    FileInputStream fis = new FileInputStream(file);
                    // Get the object of DataInputStream
                    DataInputStream in = new DataInputStream(fis);
                    BufferedReader br = new BufferedReader(new InputStreamReader(in));
                    String strLine;
                    //Read File Line By Line
                    while ((strLine = br.readLine()) != null)   {
                        // Print the content on the console
                        log.append(strLine);
                    }
                    //Close the input stream
                    in.close();
                }catch (Exception e){//Catch exception if any
                    System.err.println("Error: " + e.getMessage());
                }
            }
        }

        //Handle save button action.
        else if (source == saveButton) {
            int returnVal = fc.showSaveDialog(this);
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                //This is where a real application would save the file.
                log.append("Saving: " + file.getName() + "." + newline);
            } else {
                log.append("Save command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());
        }
    }

    public static void main(String[] args) {
        PaintBrush p = new PaintBrush();
        p.init();
        p.setSize(500,500);
        p.setVisible(true);

    }

    }