Please take a look at this page. In the video I explain how to create a Java Server in Windows to have a 2 way communication with ESP-8266.
Now, if you like to have a multiple http connection, you need to put the connection part in a java thread. It should work fine. If you had any question about threat, just make a comment under the same video. I always check those comments and I'd be happy to help.
http://subtledesign.net/index.php?id=le ... 266-esp-01
Direct link to the video:
https://youtu.be/qKEIg4UF8Mc