在action,servlet之外的bean里获取applicationcontext的方法

1.通过Spring提供的工具类获取ApplicationContext对象 


import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import org.springframework.context.ApplicationContext;

import org.springframework.web.context.WebApplicationContext;

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

public class InitServletContextListenerimplements ServletContextListener {

private static WebApplicationContext springContext;

    public InitServletContextListener() {

        super();

    }  

    public void contextInitialized(ServletContextEvent event) {

        springContext = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());

    } 

    public void contextDestroyed(ServletContextEvent event) {

    }

    public static ApplicationContext getApplicationContext() {

        return springContext;

    } 

}

2.将继承该监听器接口的类配置到web.xml文件中：

<!-- 用于初始化数据的监听器 -->
<listener>
<listener-class>包名.InitServletContextListener</listener-class>
</listener>


获取时

InitServletContextListener.getApplicationContext().getBean("testService");


3.另外，在web容器启动时初始化数据：

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
public class InitServletContextListener implements ServletContextListener {
/** 
* 当Servlet 容器启动Web 应用时调用该方法。在调用完该方法之后，容器再对Filter 初始化， 
* 并且对那些在Web 应用启动时就需要被初始化的Servlet 进行初始化。 
*/ 
public void contextInitialized(ServletContextEvent sce) {
/*获取ServletContext对象*/ 
ServletContext application = sce.getServletContext();
// 得到Service的实例对象
ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(application);
PrivilegeService testService = (PrivilegeService) ac.getBean("testService");
List<?> testList = testService.findAll();
application.setAttribute("testList", testList);
}
/** 
* 当Servlet 容器终止Web 应用时调用该方法。在调用该方法之前，容器会先销毁所有的Servlet 和Filter 过滤器。 
*/
public void contextDestroyed(ServletContextEvent sce) {
}
}