Learn Java for Web Development

216 CHAPTER 5: Building Java Web Applications with Spring Web MVC

11. public void driver() {


12. System.out.println(vehicle.drive());


13. 
    


14. }


15. 
    


16. }


17. 
    

   Line 7: In Listing 5-15, we have removed total control from the class

VehicleService and kept it in the XML configuration file, and the dependency is

being injected into the class VehicleService through a setter method on line 7.

Now create a client class VehicleApp, as illustrated in Listing 5-16.

Listing 5-16. Vehicle Application

1. package com.apress.decoupled;


2. import org.springframework.context.ApplicationContext;


3. import org.springframework.context.support.ClassPathXmlApplicationContext;


4. 
   


5. public class VehicleApp {


6. 
   


7. public static void main(String[] args) {


8. ApplicationContext context = new ClassPathXmlApplicationContext(


9. "beans.xml");


10. VehicleService contestService = (VehicleService) context


11. .getBean("vehicleService");


12. contestService.driver();


13. }


14. 
    


15. }

   Lines 8 to 9: These lines instantiate the application context and pass the

configuration file.

   Lines 10 to 11: These lines get the bean from the configuration file. To get a

declared bean from a bean factory or an application context, you make a call to

the getBean() method, pass in the unique bean name, and cast the return type

to its actual type before using it.

Now, you need to create a bean configuration file, which is an XML file (as illustrated in Listing 5-17),
that connects the beans.

Listing 5-17. Configuration File

1. <?xml version="1.0" encoding="UTF-8"?>


2. <beans xmlns="http://www.springframework.org/schema/beans"


3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"


4. xsi:schemaLocation="http://www.springframework.org/schema/beans


5. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">


6.