OAuth: авторизация вконтакте и получение токена для использования API

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
 
class Login {
 
    String client_id = "5407630";
    String redirect_uri = "http://oauth.vk.com/blank.html";
    String display = "popup";
    String scope = "messages";
    String response_type = "token";
    String v = "5.50";
 
    String http = "https://oauth.vk.com/authorize?client_id=" + client_id +
            "&display=" + display +
            "&redirect_uri=" + redirect_uri +
            "&scope=" + scope +
            "&response_type=" + response_type +
            "&v=" + v;
 
    Login() throws IOException {
        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(http);
        HttpResponse response = client.execute(post);
 
        String s = response.getStatusLine().toString();
          System.out.println(s);
 
    }
}