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  • Book Overview & Buying SPRING COOKBOOK
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SPRING COOKBOOK

SPRING COOKBOOK

By : Jerome Jaglale, Yilmaz
4 (3)
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SPRING COOKBOOK

SPRING COOKBOOK

4 (3)
By: Jerome Jaglale, Yilmaz

Overview of this book

This book is for you if you have some experience with Java and web development (not necessarily in Java) and want to become proficient quickly with Spring.
Table of Contents (14 chapters)
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13
Index

Using a bean via dependency injection with @Autowired

Spring configuration beans, such as the one in the Defining a bean explicitly with @Bean recipe are automatically discovered and used by Spring. To use a bean (any kind of bean) in one of your classes, add the bean as a field and annotate it with @Autowired. Spring will automatically initialize the field with the bean. In this recipe, we'll use an existing bean in a controller class.

Getting ready

We will use the code from the Defining a bean implicitly with @Component recipe, where we defined a UserService bean.

How to do it…

Here are the steps to use an existing bean in one of your classes:

  1. In the controller class, add a UserService field annotated with @Autowired:
    @Autowired
    UserService userService;
  2. In a controller method, use the UserService field:
    @RequestMapping("hi")
    @ResponseBody
    public String hi() {
      return "nb of users: " + userService.findNumberOfUsers();
    }
  3. In a web browser, go to http://localhost:8080...
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SPRING COOKBOOK
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