BLOGREADER

import javax.swing.*;
import java.net.*;
import java.io.*;
import java.util.*;
import java.text.*;

public class BlogReader extends Thread{
	private String fileName;
	private String blogUrl;
	private String lastCount;
	private String currentCount;
	private BufferedInputStream fileIn;
	private int sleepTimeMs;
	
	public BlogReader(String fileName, String blogUrl, int sleepTimeMin){
		this.fileName	= fileName;
		this.blogUrl	= blogUrl;
		this.sleepTimeMs	= sleepTimeMin*60*1000;
	}
	
	private boolean fileInRead(){
		// Saved count
		int car;
		StringBuffer buffer = new StringBuffer();
		try{
			fileIn = new BufferedInputStream(new FileInputStream(fileName));

			while((car = fileIn.read()) != -1){
				buffer.append((char)car);
			}
			
			lastCount = new String(buffer.toString());
			
			if(car == -1)
				fileIn.close();
			
			return true;
		}catch (FileNotFoundException ex){
			JOptionPane.showMessageDialog(null, "Error BlogReader: you have to create and initialize the file "+fileName+" manually !");
			System.exit(0);
			return false;
		}catch (IOException ex){
			System.out.println("Error BlogReader!");
			ex.printStackTrace();
			return false;
		}
	}
	
	private boolean saveNewInformations(String newCount){
		// Save new information
		OutputStream fileOut;
		byte [] bytes= newCount.getBytes();
		try{
			fileOut = new BufferedOutputStream(new FileOutputStream(fileName));
			for(int i = 0; i < newCount.length(); i++ )
				fileOut.write(bytes[i]);
			fileOut.flush();
			fileOut.close();
			return true;
		
		}catch (FileNotFoundException ex){
			JOptionPane.showMessageDialog(null, "Error BlogReader: cannot open the file "+fileName+" for writing !");
			return false;
		}catch (IOException ex){
			System.out.println("Error BlogReader!");
			ex.printStackTrace();
			
			return false;
		}
	}
		
	private void search (){
			if(!fileInRead())
				System.exit(0);
			
			System.out.println( DateFormat.getTimeInstance().format(new Date()));
			System.out.println("Last count was : "+lastCount+" comments");
		
			StringBuffer buffer = new StringBuffer();
			int car;
					
			// String
			String strToSearch = new String("commentaires</li>");
			String page = new String();
					
			try{
				// Connection
				URL myBlog = new URL(blogUrl);
				URLConnection connection = myBlog.openConnection();
				System.out.println("Connection...");
				// 	read the URL
				InputStream is = connection.getInputStream();
						
				while( (car = is.read()) != -1){
					//System.out.print((char)car);
					buffer.append((char)car);
				}
				page = buffer.toString();
				// Parse HTML
				if(page.contains(strToSearch)){
					int firstOccurrence = buffer.indexOf(strToSearch);
					buffer.delete(0, firstOccurrence-(lastCount.length()+1)); // +1 for the space
					firstOccurrence = buffer.indexOf(strToSearch);
					buffer.delete(strToSearch.length()+(lastCount.length()+1)-5, buffer.length());
					
					currentCount = new String(buffer.substring(0, buffer.indexOf(" ")));
					System.out.println("Current count is : "+currentCount+" comments");
					if(lastCount.compareTo(currentCount) != 0){
						System.out.println("You have new comment(s) on your blog !");
						JOptionPane.showMessageDialog(null, "BlogReader: you have new comment(s) on your blog!");
						saveNewInformations(currentCount);
						connection = null;
					}else{
						System.out.println("No new comment...");
					}
				}else{
					JOptionPane.showMessageDialog(null, "Error BlogReader: the doesn't contain strToSearch !");
				}
			}catch (MalformedURLException ex){
				JOptionPane.showMessageDialog(null, "Error BlogReader: Malformed URL!");
			}catch (IOException ex){
				System.out.println("Error BlogReader!");
				ex.printStackTrace();
			}
		}
	
	// run methode
	public void run() {
		while(true){
			search();
			try{
				sleep(sleepTimeMs);
			}catch (Exception e){
				e.printStackTrace();
			}
		}
		
	}
	
	// main
	static public void main(String [] arg){
		System.out.println("-----[BlogReader by psyphi]-----");
		System.out.println("--> http://psyphi.zeblog.com <--");
		System.out.println("--------------------------------");
		BlogReader br = new BlogReader("last_count", "http://psyphi.zeblog.com", 15);
		br.start();
	}
}