Spring 设置监听器

WEB-INF/web.xml

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!-- 声明监听器 创建容器时读取配置文件
    默认 : /WEB-INF/applicationContext.xml

   -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

Servlet 有两种方法引入

1、

        WebApplicationContext ctx = null;
        String key = WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE;
        ServletContext sc = getServletContext();
        Object attr = sc.getAttribute(key);
        if(attr != null){
            ctx = (WebApplicationContext) attr;
        }

2、

WebApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());