// Programmed by Julian. Happy fapping.

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) throws IOException {
        saveAllImages("s", 16015671);
    }

    public static void saveAllImages(String board, long thread) {
        for (String s : getImageLinks(board, thread)){
            System.out.println(s);
            saveImage(s, thread + "/" + s.replaceFirst("http://i.4cdn.org/" + board + "/", ""));
        }
    }

    public static List<String> getImageLinks(String board, long thread) {
        List<String> list = new ArrayList<String>();
        for (String s : getUrlSource("http://boards.4chan.org/" + board + "/thread/" + (thread)).split(" ")){
            if (s.startsWith("src=\"//i.4cdn.org/" + board + "/")){
                String st = s.replaceFirst("src=\"//", "");
                list.add("http://" + st.substring(0, st.length() - 6) + ".jpg");
            }
        }
        return list;
    }

    private static String getUrlSource(String url){
        try {
            URL yahoo = new URL(url);
            URLConnection yc = yahoo.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    yc.getInputStream(), "UTF-8"));
            String inputLine;
            StringBuilder a = new StringBuilder();
            while ((inputLine = in.readLine()) != null)
                a.append(inputLine);
            in.close();
        return a.toString();
        } catch (IOException ex){
            return null;
        }
    }

    public static void saveImage(String imageUrl, String destinationFile){
        File f2 = new File(destinationFile.split("/")[0]);
        if (!f2.exists()){
            f2.mkdir();
        }
        try {
            URL url = new URL(imageUrl);
            InputStream is = url.openStream();
            OutputStream os = new FileOutputStream(destinationFile);
            byte[] b = new byte[2048];
            int length;
            while ((length = is.read(b)) != -1) {
                os.write(b, 0, length);
            }
            is.close();
            os.close();
        } catch (IOException ex){}
    }
}