SPRING COOKBOOK

Calling a DAO method from a controller class

In this recipe, we'll see how to call a DAO method from a controller class.

Getting ready

We will use the DAO class defined in the previous recipe and pretend that it has an add(User) method. In the following recipes, we will write actual DAO methods.

How to do it…

Here are the steps to use a DAO method from a controller class:

1. In your controller class, add the DAO as an @Autowired field:

   @Controller
   public class UserController {
     @Autowired
     private UserDAO userDAO;
   

2. Use the DAO in any controller method:

   userDAO.add(user);

How it works…

Because of @Autowired, the userDAO field will be automatically initialized by Spring using dependency injection.