xkcd.java

xkcd.java

import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
 
public class xkcd extends JFrame {
 
    private static final String XKCD_URL = "http://dynamic.xkcd.com/random/comic/";
    private JLabel comic;
    
    public static void main(String[] args)
    {
        xkcd  win = new xkcd();
        win.setVisible(true);
        win.feedNewPic();
    }
 
    public xkcd()
    {
        super("xkcd comic feed");
        /* todo -  make it resize dynamically */
        setSize(850, 600);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        
        /* setup the comic */
        comic = makeComicLabel();
        add(comic);
    }
    
    private void feedNewPic()
    {
        URL url;
        Image image;
        
        try {
            url = new URL(getRandPic());
            image = ImageIO.read(url);
            
            comic.setIcon(new ImageIcon(image));
        }
        catch (Exception e)
        {
            e.printStackTrace();
            JOptionPane.showMessageDialog(null, "ERROR!");
        }
    }
    
    private String getRandPic()
    {
        try
        {
            BufferedReader in = new BufferedReader(
                                    new InputStreamReader(
                                        new URL(XKCD_URL).openStream()));
            StringBuffer sb = new StringBuffer();
            String line;
            while ((line = in.readLine()) != null)
            {
            	sb.append(line);
            }
            Matcher m = Pattern.compile("^.*<div id=\"comic\">\w*<img src=\"([^\"]+)\".*").matcher(sb.toString());
            if (m.matches()) {
            	return m.group(1);
            }
        }
        catch (MalformedURLException e){
            e.printStackTrace();}
        catch (IOException e) {
            e.printStackTrace();}
        
        /* we shouldn't get here */
        return "";
    }
    
    private JLabel makeComicLabel()
    {
        JLabel temp = new JLabel();
        
        temp.addMouseListener(
            new MouseListener()
            {
                public void mouseClicked(MouseEvent e)
                {
                    feedNewPic();
                }
                public void mousePressed(MouseEvent e) {}
                public void mouseReleased(MouseEvent e) {}
                public void mouseEntered(MouseEvent e) {}
                public void mouseExited(MouseEvent e) {}
            }
        );
        return temp;
    }
}