Java Servlet之在web容器里注册Servlet

<?xml version="1.0"?><web-app     xmlns="http://xmlns.jcp.org/xml/ns/javaee"            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"            xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_0.xsd"             version="3.0">     <welcome-file-list>        <welcome-file>/MyFirstServlet</welcome-file>    </welcome-file-list>     <servlet>        <servlet-name>MyFirstServlet</servlet-name>        <servlet-class>com.howtodoinjava.servlets.MyFirstServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>MyFirstServlet</servlet-name>        <url-pattern>/MyFirstServlet</url-pattern>    </servlet-mapping> </web-app>