<?xml version="1.0" encoding="UTF-8">
<!-- web.xml 主要作用:
		1、装载DispatcherServlet类;
		2、读取Spring配置文件;
		3、设置初始化参数;
		4、加入标记库;
		4、路由设置;
-->
<!-- web-app中要有各种命名空间-->
<web-app version="2.4" xmlns=""
			xmlns=""
			xsi:schemaLocation="">
	<servlet>
		<servlet-name>dispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!--contextConfigLocation用来指定Spring 配置文档的位置,可以指定多个配置文档,但要以逗号分隔
Spirng 默认为servlet名+“servlet.xml”,并放在WEB-INF目录下;如果不指定 contextConfigLocation,则默认 是防在WEB-INF目录下的dispatcherServlet-servlet.xml 
-->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/dispatcherServlet-servlet.xml</param-value>
			<!--如果servlet文件的命名方式是 上面的 servlet-name+"-servlet.xml",则可以不用这个初始化参数-->
		</init-param>
		
		<load-on-startup>1</load-on-startup>
		<!--指定当Web启动时,加载servlet的顺序;当值>=0时,先加载小的,在加载大的;如果<0或者没有设定,将在web首次访问是加载;-->
	</servlet>
	
	<servlet-mapping>
		<servlet-name>dispatcherServlet</servlet-name>
		<!--指定访问Servlet是URL相对路径-->
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
</web-app>
<!--end-->
<!-----------------------------------------Example---------------------------------------------------->	
	<?xml version="1.0" encoding="UTF-8"?>
    <web-app id="WebApp_ID" version="2.4" 
		xmlns="http://java.sun.com/xml/ns/j2ee" 
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
		xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
		http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	
		<display-name>Spring Web MVC Hello World Application</display-name>
		
		<servlet>
			<servlet-name>spring</servlet-name>
				<servlet-class>
				org.springframework.web.servlet.DispatcherServlet
				</servlet-class>
			<load-on-startup>1</load-on-startup>
		</servlet>
	
		<servlet-mapping>
			<servlet-name>spring</servlet-name>
			<url-pattern>/</url-pattern>
		</servlet-mapping>
	</web-app>