web.xml 配置文件？

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>WebDay01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

  <!--
       1.分为servlet 和 servlet-mapping 两个部分
       2.servlet 分为  servlet-name  和servlet-class
       3.servlet-mapping 分为 servlet-name和 URL-pattern两部分

 -->
  <servlet>
    <servlet-name>ServletDemo</servlet-name>   <!-- servlet的名字 -->
    <servlet-class>com.aaa.servlet.ServletDemo</servlet-class><!--相对路径，包名+类名 -->
  </servlet>
  <servlet-mapping>
    <servlet-name>ServletDemo</servlet-name>
    <url-pattern>/zxf</url-pattern>   <!--配置的URL路径  可以随意起名字  注意规范性！  需要配置的原因？-->
  </servlet-mapping>

  <servlet>
    <servlet-name>ServletDemo01</servlet-name>
    <servlet-class>com.aaa.servlet.ServletDemo01</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>ServletDemo01</servlet-name>
    <url-pattern>/zxh</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>HttpServletDemo</servlet-name>
    <servlet-class>com.aaa.servlet.HttpServletDemo</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>HttpServletDemo</servlet-name>
    <url-pattern>/666</url-pattern>
  </servlet-mapping>

  <!--创建的  servlet   这里会自动生成！ -->
  <servlet>
    <description></description>
    <display-name>HttpServletText</display-name>
    <servlet-name>HttpServletText</servlet-name>
    <servlet-class>com.aaa.servlet.HttpServletText</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>HttpServletText</servlet-name>
    <url-pattern>/HttpServletText</url-pattern>
  </servlet-mapping>
</web-app>