factory-bean

factory-bean in spring facilitates to create bean by factory class.

       Factory class will have:

              a)non- static methods to return the object of bean.

              b)a static method to return the instance of class itself.

      

       <bean id="serviceFactory" class="com.concretepage.ServiceFactory" factory-method="createInstance"></bean>

       <bean id="userService" factory-bean="serviceFactory" factory-method="createUserService"></bean>

       <bean id="loginService" factory-bean ="serviceFactory" factory-method="createLoginService"></bean>

       public class ServiceFactory {

              private static UserService userService= new UserService();

              private static LoginService loginService= new LoginService();

              private static ServiceFactory serviceFactory= new ServiceFactory();

              private ServiceFactory(){}

             

              public  UserService createUserService(){

                     return userService;

              }

          

              public  LoginService createLoginService(){

                     return loginService;

              }

             

              public static ServiceFactory createInstance(){

                     return serviceFactory;

              }

       }

       public class UserService {

         public UserService() {

                System.out.println("Initialising UserService.");

         }

       }

       public class LoginService {

              public LoginService(){

                     System.out.println("Initialising LoginService.");

              }

       }

       public class SpringDemo {

           public static void main(String... args) {

              ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");

             

              context.getBean("userService");

              context.getBean("loginService");

           }

       }