web.xml基本配置描述

先加载一段写好的web.xml：

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

     <!--Spring ApplicationContext 载入 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- SpringMVC -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

     <!-- session超时定义,单位为分钟 -->
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>

    <!-- 默认首页定义 -->
    <welcome-file-list>
        <welcome-file>index.ftl</welcome-file>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

web.xml中通过以下配置加载/WEB-INFO/applicationContext.xml（spring 全局配置文件，用来控制spring特性）

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

/WEB-INFO/applicationContext.xml是默认路径及文件名称，如果调整文件路径或名称，需要额外添加以下contextConfigLocation参数：

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext-new.xml</param-value>
</context-param>
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

web.xml中通过以下配置加载/WEB-INFO/dispatcher-servlet.xml（属于spring mvc，加载控制器，拦截uri转发view）

    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>