CR4W13R

import java.io.IOException;
import java.net.URL;
import java.nio.file.*;
import java.util.Scanner;
import javax.xml.bind.DatatypeConverter;
public class Crawler {
    public static void main(String[] args) throws IOException {
        String url = "http://www.ctf.tn/tasks/prog/crawler/checkme/";
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i <= 324; i++)
            sb.append(new Scanner(new URL(url+i).openStream(), "UTF-8").useDelimiter("\\A").next());
        System.out.println(sb.toString());
        Files.write(Paths.get("/home/KeyStrOke/Desktop/out.zip"), DatatypeConverter.parseHexBinary(sb.toString()));
} }