import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.File;
import java.io.IOException;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import javax.swing.JButton
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;

public class Updater implements ActionListener
{
public JFrame updateFrame;
public JPanel updatePanel;
public JButton updateButton;
public JProgressBar updateProgress;

public Updater()
{
updateFrame = new JFrame("Updater");
updatePanel = new JPanel(new BorderLayout());

updateButton = new JButton("Update");
updateButton.setActionCommand("Update");
updateButton.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
updateButton.addActionListener(this);
updateButton.setPreferredSize(new Dimension(150, 50));

updateProgress = new JProgressBar();
updateProgress.setStringPainted(true);
updateProgress.setString("Click update to update");
updateProgress.setPreferredSize(new Dimension(150, 50));
updateProgress.setMaximum(100);
updateProgress.setValue(0);

updatePanel.add(updateButton, BorderLayout.CENTER);
updatePanel.add(updateProgress, BorderLayout.SOUTH);

updateFrame.add(updatePanel);
updateFrame.pack();
updateFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
updateFrame.setVisible(true);
}

public static void main(String[] arg)
{
new Updater();
}

public void deleteFile(File aFile)
{
if(aFile.exists())
{
updateProgress.setString("Deleting jar");
aFile.delete();
}
}

public void actionPerformed(ActionEvent evt)
{
String c = evt.getActionCommand();
if(c.equals("Update"))
{
File jar = new File("runescape.jar");
deleteFile(jar);
try
{
updateProgress.setString("Connecting");
URLConnection jarUC;
jarUC = new URL("http://sl5.runescape.com/runescape.jar").openConnection();
DataInputStream down = new DataInputStream(jarUC.getInputStream());
updateProgress.setString("Creating data stream");
PrintStream out = new PrintStream(jar);
int length = jarUC.getContentLength();
updateProgress.setString("Downloading jar");
while(jar.length() < length)
{
out.write(down.read());
updateProgress.setValue((int)(jar.length()/length*100));
}
updateProgress.setString("Runescpe jar downloaded");
updateButton.setEnabled(false);
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}

}