How to invoke a REST service

Question

I have created a REST service which retrieves data from the database as per the request made and returns it JSON format.

Now, I need to create a HTML page with a button

Answer 1

Well, all your service does is respond to HTTP requests. So, you need to send one - either

• direct the browser to move to a corresponding URL (document.location.href = <url>), or
• send an XMLHTTPRequest (aka AJAX) and parse the result, for which JQuery has built-in functionality.
  • then edit the currently loaded page to include the results the way you like using DOM (see e.g. Google on "jquery tutorial editing DOM" for that)
  • See e.g. AJAX Introduction - W3Schools for an AJAX overview. It describes how this happens in plain JS, jquery.ajax is a convenient wrapper over that.

You don't need to connect you client-side stuff with the Java project in any way - REST is specifically designed to allow them to be independent.