Spring Init A Bean with Factory 

1、静态工厂方法获取bean

<bean id="clientService" class="examples.ClientService" factory-method=    "createInstance"/>

 public class ClientService {
            private static ClientService clientService = new ClientService();
            private ClientService() {}
            public static ClientService createInstance() {
            return clientService;
            }
        }

2、工厂实例非静态方法

<!-- the factory bean, which contains a method called createInstance() -->
<bean id="serviceLocator" class="examples.DefaultServiceLocator">
<!-- inject any dependencies required by this locator bean -->
</bean>
<!-- the bean to be created via the factory bean -->
<bean id="clientService" factory-bean="serviceLocator" factory-method="createClientServiceInstance"/>

<bean id="clientService2" factory-bean="serviceLocator" factory-method="createClientServiceInstance2"/>
public class DefaultServiceLocator {
    private static ClientService clientService = new ClientServiceImpl();
    
    private DefaultServiceLocator() {}
    public ClientService createClientServiceInstance() {
        return clientService;
    }
    public  ClientService createClientServiceInstance2() {
        return clientService;
    }
}

一个工厂的获取bean的方法可以有多个