Login on website using jsoup

Question

On this website, you can enter your student-card-number, and then it will display how much money is left on that card. I want to obtain the information using JSOUP. This is my c

Answer 1

You should use both get and post:
First you have to send get request with no parameters to the URL - http://kortladdning3.chalmerskonferens.se/Default.aspx. The server replies with some cookies, and two values you'll use later - __VIEWSTATE and __EVENTVALIDATION. These values vary from request to request, so you can't use hard-coded values like you did.
After extracting these values, send post request, with the same fields you do now.
You can look at a very similar procedure here - Problems submitting a login form with Jsoup