1:首先在web.xml中声明servlet

<servlet>
	<servlet-name>ApplicationOnload</servlet-name>
	<servlet-class>com.ApplicationOnload</servlet-class>
	</servlet>
	<servlet-mapping>
	<servlet-name>ApplicationOnload</servlet-name>
	<url-pattern>/ApplicationOnload</url-pattern>
	</servlet-mapping>

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContextEvent;

import org.springframework.context.ApplicationContext;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.support.WebApplicationContextUtils;


public class ApplicationOnload extends ContextLoaderListener {
	private DisplayService displayService;
	
	public void contextInitialized(ServletContextEvent event) 
	{ 
		ApplicationContext applicationContext = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());  
		displayService = (DisplayService)applicationContext.getBean("displayService");
  <span style="white-space:pre">		</span>//相关代码
	}
}