1.簡單方式

<bean id="userBean" class="com.boomsecret.bean.UserBean"/>

2.靜態工廠

public class BeanFactory {
    public static UserBean getUserBean() {
        return new UserBean();
    }
}
<bean id="userBean" 
      class="com.boomsecret.bean.BeanFactory" 
      factory-method="getUserBean"/> 

3.實例工廠

<bean id="beanFactory" class="com.boomsecret.bean.BeanFactory"/>                                                  
<bean id="userBean" factory-bean="beanFactory" factory-method="getUserBean"/>