如何使用Jsoup登录网站进行web抓取

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

public class WebCrawler {
    public static void main(String[] args) throws Exception {
        // 构建登录表单
        Connection.Response loginForm = Jsoup.connect("https://example.com/login")
                .method(Connection.Method.GET)
                .execute();
        Document loginDoc = loginForm.parse();
        String csrfToken = loginDoc.select("input[name=_csrf]").val();

        // 填写登录表单数据
        Connection.Response loginResponse = Jsoup.connect("https://example.com/login")
                .data("username", "your_username")
                .data("password", "your_password")
                .data("_csrf", csrfToken)
                .cookies(loginForm.cookies())
                .method(Connection.Method.POST)
                .execute();

        // 登录成功后，发送GET请求获取登录后的页面
        Document loggedInPage = Jsoup.connect("https://example.com/logged_in_page")
                .cookies(loginResponse.cookies())
                .get();

        // 处理登录后的页面数据
        // ...

        System.out.println(loggedInPage.html());
    }
}