Lightning Components Developer’s Guide

Getting Started
Creating Components
Communicating with Events
Creating Apps
App Basics
Styling Apps
Using JavaScript
JavaScript Cookbook
Using Apex
Creating Server-Side Logic with Controllers
Apex Server-Side Controller Overview
Creating an Apex Server-Side Controller
Calling a Server-Side Action
Queueing of Server-Side Actions
Abortable Actions
Creating Components
Working with Salesforce Records
Testing Your Apex Code
Making API Calls from Apex
Using Object-Oriented Development
Using the AppCache
Controlling Access
Distributing Applications and Components
Debugging
Reference
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Apex Server-Side Controller Overview

Create a server-side controller in Apex and use the @AuraEnabled annotation to enable client- and server-side access to the controller method.
Only methods that you have explicitly annotated with @AuraEnabled are exposed.

Don't store component state in your controller. Store it in a component's attribute instead.

Tip

This Apex controller contains a serverEcho action that prepends a string to the value passed in.