spring容器WebApplicationContextUtils

1：在web.xml中定义listener 
  <listener> 
  <listener-class>com.BeanListener</listener-class> 
  </listener> 
2:在BeanListener.java中定义 

import javax.servlet.ServletContextEvent; 
import javax.servlet.ServletContextListener; 

import org.springframework.web.context.WebApplicationContext; 
import org.springframework.web.context.support.WebApplicationContextUtils; 



public class BeanListener implements ServletContextListener { 
private static WebApplicationContext context; 

public void contextDestroyed(ServletContextEvent servletContextEvent) { 


} 


public void contextInitialized(ServletContextEvent servletContextEvent) { 

context = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContextEvent.getServletContext()); 
} 

public static Object getBean(String beanName) { 
return context.getBean(beanName); 
} 
}