使用监听器解决路径问题

public class ServerStartupListener implements ServletContextListener {

    /**
     * 在web 应用初始化的时候会被监听到
     */
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        //将 web 应用名称（路径）保存到application 范围中
        ServletContext application = sce.getServletContext();
        String path = application.getContextPath();
        application.setAttribute("APP_PATH", path);
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        // TODO Auto-generated method stub

    }

}

<!-- 配置监听器，解决路径问题 -->
<listener>
    <listener-class>com.atguigu.atcrowdfunding.web.ServerStartupListener</listener-class>
</listener>