Accessing Website With Authentication And Gathering Data From It

I want to create some java program that accesses some specific URL, enter username and password to specific fields and get some data from it. Getting data part is not that important, but I want to help for accessing the website with username and password. I did some research, I found Selenium and tried some stuff with it, however it did not help me that much. If you have any suggestions, let me know. I am not experienced in website access through java at all. Thank you.