web - 登录到一个来自 href 的超链接的页面

Question

我想从 Java exe 编写自动登录到表单的代码，这将允许我点击一个href链接，该链接将重定向到另一个站点，该站点将有一个登录名，然后我将提供凭据，然后下载内容页面，然后在页面中输入详细信息并提交。

这对于 Java 编码来说听起来是不是一项艰巨的任务？通常这个过程是由人工操作员完成的，但我需要自动化它。

Answer 1

1.- Prepare a Sniffer like HttpFox Firefox add-on or Whireshark.

2.- Do login in the site and take the url of the login, the method ( GET or POST ) and the parameters name for username and password ( You may also get this from the source code of the login page ).

3.- Navigate into the site and take de name of the session cookies ( or from all the cookies ).

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;


public class Tests {

    public static String cookie;

    public static void main(String[] args) throws MalformedURLException, IOException {

        URL url = new URL("https://some_site...");
        HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
        https.setRequestMethod( "POST" ); //or GET
        https.addRequestProperty( "usename_field_name", "username" );
        https.addRequestProperty( "password_field_name", "password" );
        https.addRequestProperty( "Cookie", cookie );

        BufferedReader in = new BufferedReader(new InputStreamReader(https.getInputStream()));

        String linea;

        while ((linea = in.readLine()) != null) {
            // Recover the cookie and save it in a variable.
            // You must put it in other connections.
        }
    }
}