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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Random;

public class URLClient {
    protected URLConnection connection;
    private static int MAX_VALUE = 0xFFFFF;

    public static void main(String[] args) {
        URLClient client = new URLClient();
        String urlStr;
        int count = 0;
        do {
            urlStr = nextUrl();
            count++;
            System.out.print(count + "# Trying... ");
        } while (!isDowndloadable(urlStr));
        if (count > MAX_VALUE) {
            System.out.println("Not found :( ");
        } else {
            System.out.println("Bingle!!!\nThe Url is: " + urlStr);
        }
    }

    private static String nextUrl(int iBefore) {
        int iNum = iBefore++;
        String temp = Integer.toHexString(iNum);
        if(temp.length()<5){
            String blankStr = "";
            for(int i=0;i<(5-temp.length());i++){
                blankStr +="0";
            }
            temp = blankStr + temp;
        }
        
        String urlStr =
            "http://www.instantiations.com/download/rad"
                + temp
                + ".tmp/swt_designer_pro_v1.2.2_for_Eclipse3.0.zip";
        return urlStr;
    }

    private static String nextUrl() {
        int iNum = (new Random().nextInt(0xFFFFF));
        String temp = Integer.toHexString(iNum);
        if(temp.length()<5){
            String blankStr = "";
            for(int i=0;i<(5-temp.length());i++){
                blankStr +="0";
            }
            temp = blankStr + temp;
        }
        
        String urlStr =
            "http://www.instantiations.com/download/rad"
                + temp
                + ".tmp/swt_designer_pro_v1.2.2_for_Eclipse2.1.zip";
        return urlStr;
    }

    public static boolean isDowndloadable(String urlString) {
        StringBuffer document = new StringBuffer();
        try {
            URL url = new URL(urlString); //������������
            URLConnection conn = url.openConnection();
            BufferedReader reader =
                new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));

            if ((reader.readLine()) != null) {
                return true;
            }

            reader.close();
        } catch (MalformedURLException e) {
            System.out.println("Unable to connect to URL: " + urlString);
        } catch (IOException e) {
            System.out.println(
                "IOException when connecting to URL: " + urlString);
        }
        return false;
    }

}


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