doucang6739 2014-06-06 19:55
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来自php网站的java boolean

i want to create license system in java.

I created function to check if license is true.

My code:

    private static boolean isPurchased(String license)
{
    try
    {
        URL url = new URL("http://mineverse.pl/haslicense.php?license=" + license);
        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
        String str = in.readLine();
        in.close();
        return Boolean.valueOf(str);
    } catch (Exception e)
    {
        e.printStackTrace();
    }
    return false;
}

and chceck function onenable

        if(this.isPurchased(license)){ 
                    String license = cfg.getString("Licensing_System.License");
        System.out.println("Licencja" + license + " kupiona! Dziekujemy!");
        System.out.println(this.isPurchased(license));

    }else {
        System.out.println("Licencja zostala sfalszowana! Zglaszam to do serwera autoryzacji!");
    }

And my link:

http://mineverse.pl/haslicense.php?license=diverse12345

as you can see this link return true, (i did echo 'true';) but java console always return false (i want true because website have true at this link) and it logs:

Licencja zostala sfalszowana! Zglaszam to do serwera autoryzacji!

Whats wrong? How can i return true on my website to allow java learn this boolean?>

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2条回答 默认 最新

  • doujiao3074 2014-06-06 20:04
    关注

    That's because your server is not just returning True or False. It is returning this instead:

    <html>
</html>
            True

    and your code is only reading the first line <html> and parsing it as a boolean, which results in false.

    To fix it, either read the whole body looking for True/False or return just True/False on your body.

    The following code should work with the current html even if it contains the <html> tags:

            URL url = new URL("http://mineverse.pl/haslicense.php?license=" + license);
        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
        String str = null;
        boolean ret = false;
        while ((str = in.readLine()) != null) {
            str = str.toLowerCase();
            if (str.contains("true")) {
                ret = true;
                break;
            }
        }
        in.close();
        return ret;
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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