如何使用JSoup导航页面

Question

I'm working on an android app which parses an html page and uses its elements and then goes to the next page and extracts its elements. I was previously doing this work with Selenium but when I use it with Android it uses way too much memory and the app stops responding. Now I'm stuck at the login page where I have to enter the username and password. I manage to do that but I'm not able to go to the next page. It returns me the same login page and not the next one. I really need to do this with JSoup because eventually the code has to be integrated with the android app code. Help please!

 try {


        String url = "http://slateisb.nu.edu.pk/portal";
        Document doc = Jsoup.connect(url).
                followRedirects(true).
                data("eid", "i110013").
                data("pw", "001").
                method(Method.POST).get();
        String title = doc.title();
        print("Title : %s" , title);

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Answer 1

import java.util.Map;

import org.jsoup.Connection;
import org.jsoup.Connection.Method;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class Main {

    public static void main(String[] args) {
        try {
            //In this url you must login
            String loginUrl = "http://slateisb.nu.edu.pk/portal/xlogin";

            //This is an example, it can be anything else
            String url = "http://slateisb.nu.edu.pk/portal";

            //First login. Take the cookies
            Connection.Response res = Jsoup
                    .connect(loginUrl)
                    .data("eid", "i110013")
                    .data("pw", "001")
                    .referrer("http://www.google.com")
                    .userAgent(
                            "Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
                    .method(Method.POST).timeout(0).execute();

            Map<String, String> loginCookies = res.cookies();

            //Now you can parse any page you want, as long as you pass the cookies
            Document doc = Jsoup
                    .connect(url)
                    .timeout(0)
                    .cookies(loginCookies)
                    .referrer("http://www.google.com")
                    .userAgent(
                            "Mozilla/5.0 (Windows; U; WindowsNT 5.1; en-US; rv1.8.1.6) Gecko/20070725 Firefox/2.0.0.6")
                    .get();

            System.out.println("Title : " + doc.title());

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}