Worklight to tomcat migration

Question

Currently my UI code is running in worklight server(Version:6.0.2) and consuming SAP services through java servelet which is running in Tomcat(7.0.34).

How to migrate the UI code that is running on worklight server to Tomcat? The organisation is planning to stop using worklight.

Sample from existing code flow:

abc.js file: below code is inside an event triggered from UI

var invocationData = {
    adapter : 'EMDetailsMiddleLayer',
    procedure : 'getManagerDetails',
    parameters : [ searchParam, globalUserIdEM ]
};

Middlelayer.js:

function getManagerDetails(searchParam,globalUserIdEM)
{
        var input = {
        method : 'post',
        returnedContentType : 'json',
        path : 'TestEmployee/MovementServlet',
        parameters : {
            'action': 'getMgrDetails',
            'input' : searchParam,
            'pernr' : globalUserIdEM
        }
    };
    return WL.Server.invokeHttp(input);
}

Empservelet.java

if (valuesFromUI.equalsIgnoreCase("getMgrDetails")) {

                String pernr = request.getParameter("pernr").toString().trim();
                pernr = pernr.replace(" ", "");
                strReqUrl = resourceConst.getString("SAP Url")
                        + "&pernr=" + pernr;
            }

How to migrate UI code (html and js) to tomcat?