serverlet Web.xml配置代码解释

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> ?<display-name>testservletjava5</display-name> ?<welcome-file-list> ???<welcome-file>default.jsp</welcome-file> ?</welcome-file-list> ?<!-- servlet生命周期 1、web容器加载 2、init 3、service（提供服务）4、销毁（destroy） --> ?<!-- 配置servlet的类及名字 --> ?<servlet> ?????<servlet-name>HelloServlet</servlet-name> ?????<servlet-class>com.oracleoaec.servlet.p1.HelloServlet</servlet-class> ?????<init-param> ?????????<param-name>test</param-name> ?????????<param-value>wanger</param-value> ?????</init-param> ?????<!-- 0为启动web容器时就加载servlet 加载顺序是由小到大顺序加载 ??????,小于0的话是访问时加载--> ?????<load-on-startup>1</load-on-startup> ?</servlet> ?<!-- 配置访问地址（url） --> ?<servlet-mapping> ?????<servlet-name>HelloServlet</servlet-name> ?????<url-pattern>/helloServlet.do</url-pattern> ?</servlet-mapping> ?<servlet-mapping> ?????<servlet-name>HelloServlet</servlet-name> ?????<url-pattern>/helloServlet</url-pattern> ?</servlet-mapping> ??<servlet-mapping> ?????<servlet-name>HelloServlet</servlet-name> ?????<url-pattern>/sakdfshd.abc</url-pattern> ?</servlet-mapping> ?<servlet-mapping> ?????<servlet-name>HelloServlet</servlet-name> ?????<url-pattern>/p1/sakdfshd.abc.abc</url-pattern> ?</servlet-mapping> ?????<servlet> ?????<servlet-name>HelloServlet2</servlet-name> ?????<servlet-class>com.oracleoaec.servlet.p1.HelloServlet2</servlet-class> ?????<load-on-startup>0</load-on-startup> ?</servlet> ?<servlet> ???<servlet-name>LoginServlet</servlet-name> ???<servlet-class>com.oracleoaec.servlet.p1.LoginServlet</servlet-class> ?</servlet> ?<servlet> ???<servlet-name>LogoutServlet</servlet-name> ???<servlet-class>com.oracleoaec.servlet.p1.LogoutServlet</servlet-class> ?</servlet> ?<servlet-mapping> ????<servlet-name>HelloServlet2</servlet-name> ????<url-pattern>/helloServlet2.do</url-pattern> </servlet-mapping> ?<servlet-mapping> ???<servlet-name>LoginServlet</servlet-name> ???<url-pattern>/loginServlet.do</url-pattern> ?</servlet-mapping> ?<servlet-mapping> ???<servlet-name>LogoutServlet</servlet-name> ???<url-pattern>/logoutServlet.do</url-pattern> ?</servlet-mapping> ?????</web-app>