Generally, you can call servlet different ways
You can call it using AJAX request, which normally you use to load the content without refreshing entire page
$("button").click(function(){
$.ajax({url: "/bin/servlet", success: function(result){
$("#div1").html(result);
}});
});
You can also use HTML form action to call servlet
<form action="/bin/servlet" method="get">
First name: <input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br>
<input type="submit" value="Submit">
</form>
- You can directly call the servlet by hitting the servlet URL in the browser
- You can also call servlet in dialog to populate drop down list etc.
Adobe Experience Manager Help | Populating AEM Component Dialog fields using JSON data returned by S...
In AEM most of the time, we use AJAX approach and populating dialog fields which are step 1 and 4
