web工程初始化spring容器， 并读入总配置文件

webapp/WEB-INF/web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>service</display-name>

<!--配置文件-->

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationcontext.xml</param-value>

</context-param>

<!-- spring容器的监听器 -->

<listener>

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

</listener>

</web-app>