成功登录JSoup后无法解析网站

Question

I successfully log into website using JSoup library, store the cookies so that i can use them for the second document where access is required. However the second document parses the data as if i am not logged in.

Here is the code:

public class Main {

public static void main(String[] args) throws Exception {

    Map<String, String> loginCookies = null;


     Connection.Response loginForm = Jsoup.connect("login page")
             .method(Connection.Method.GET)
             .execute();

     loginCookies = loginForm.cookies();

     Document document = Jsoup.connect("login page")
             .data("cookieexists", "false")
             .data("username", "user")
             .data("password", "pass")
             .data("loginbtn", "Log in")
             .cookies(loginCookies)
             .post();


    Document document2 = Jsoup.connect("Page with access required")
        .cookies(loginCookies)
        .get();

    System.out.println(document2);
}

}

What can be wrong with this code?

Answer 1

You should store and reuse cookies which contain information about your session, which means you need to store them from server response which you get after passing your credentials, not just from empty form.

So try with

Connection.Response loginForm = Jsoup.connect("login page")
        .data("cookieexists", "false")
        .data("username", "user")
        .data("password", "pass")
        .data("loginbtn", "Log in")
        //.cookies(loginCookies)
        .method(Connection.Method.POST)
        .execute();

//here `loginForm` connected to server with your credentials
//and server returned response with cookies containing informations
//required to continue session so you should store them
//and reuse to access farther pages
Map<String, String> loginCookies  = loginForm.cookies();

Document document2 = Jsoup.connect("Page with access required")
        .cookies(loginCookies)
        .get();

System.out.println(document2);