Retrieving Java data from internet with c++

I am currently writing a Windows application with multiple features in MS Visual Studio 2013 in C++ programming language. One of the features has to be that it can plot actual data on the screen. I have succeeded in plotting the graph, but I have not been able yet to get the data. With the Wininet library I can make a connection to a website and save the HTML code in a file. For some websites this is enough, because the data is part of the HTML code and after parsing it, I can plot the data. But the website (http://ift.tt/1G3SeL1) I want to retrieve the data from is written in Java and the data are Java objects. Now i have downloaded the RapidjSON library to handle Java objects. Can anyone help me further with how to retrieve the Java objects from the website? Are there any libraries for this that I do not know of? Can I send requests to the webserver with WiniNet and get the data?