Lightning Aura Components Developer Guide

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Introducing Aura Components
Quick Start
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Lightning Data Service
Using Apex
Creating Server-Side Logic with Controllers
Apex Server-Side Controller Overview
AuraEnabled Annotation
Creating an Apex Server-Side Controller
Using Apex to Work with Salesforce Records
Granting User Access for Apex Classes
Securing Data in Apex Controllers
Calling a Server-Side Action
Passing Data to an Apex Controller
Returning Data from an Apex Server-Side Controller
Returning Errors from an Apex Server-Side Controller
Queueing of Server-Side Actions
Foreground and Background Actions
Storable Actions
Abortable Actions
Testing Your Apex Code
Making API Calls from Apex
Make Long-Running Callouts with Continuations
Creating Components in Apex
Testing Components
Debugging
Performance
Reference
PDF

Creating an Apex Server-Side Controller

Use the Developer Console to create an Apex server-side controller.
  1. Open the Developer Console.
  2. Click File | New | Apex Class.
  3. Enter a name for your server-side controller.
  4. Click OK.
  5. Enter a method for each server-side action in the body of the class.
    Add the @AuraEnabled annotation to a method to expose it as a server-side action. Additionally, server-side actions must be static methods, and either global or public.
  6. Click File | Save.
  7. Open the component that you want to wire to the new controller class.
  8. Add a controller system attribute to the <aura:component> tag to wire the component to the controller. For example: 
    <aura:component controller="SimpleServerSideController">