android域名校验

import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class DomainValidationTask extends AsyncTask<String, Void, Boolean> {

    @Override
    protected Boolean doInBackground(String... params) {
        String domain = params[0];
        try {
            URL url = new URL("https://api.domainvalidation.com/validate?domain=" + domain);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            int responseCode = connection.getResponseCode();
            if (responseCode == HttpURLConnection.HTTP_OK) {
                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String inputLine;
                StringBuffer response = new StringBuffer();
                while ((inputLine = in.readLine()) != null) {
                    response.append(inputLine);
                }
                in.close();
                return response.toString().contains("valid");
            }
        } catch (Exception e) {
            Log.e("DomainValidation", e.getMessage());
        }
        return false;
    }

    @Override
    protected void onPostExecute(Boolean isValid) {
        if (isValid) {
            Log.d("DomainValidation", "Domain is valid");
        } else {
            Log.d("DomainValidation", "Domain validation failed");
        }
    }
}