web.xml方式加载Spring

来源：互联网发布：cad安装软件编辑：程序博客网时间：2024/05/16 19:51

使用web.xml方式加载Spring时，获取Spring context的两种方式：

1、servlet方式加载时：

【web.xml】

<servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/applicationContext</param-value>
        </init-param>
    </servlet>

【jsp/servlet】

ServletContext context = getServletContext();

XmlWebApplicationContext applicationContext = (XmlWebApplicationContext) context.getAttribute("org.springframework.web.servlet.FrameworkServlet.CONTEXT.dispatcherServlet");

DataSource dataSource=(DataSource)applicationContext.getBean("dataSource");

2、listener方式加载时：

【web.xml】

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext</param-value>
</context-param>

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

【jsp/servlet】

ServletContext context = getServletContext();

   WebApplicationContext applicationContext = WebApplicationContextUtils
     .getWebApplicationContext(context);

DataSource dataSource=(DataSource)applicationContext.getBean("dataSource");