servlet学习

1、web.xml servlet配置解释

<?xml version="1.0" encoding="UTF-8"?>
<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_4_0.xsd"
         version="4.0">

    <!--第一个servlet-->
    <servlet>
        <servlet-name>customServlet</servlet-name><!-- 自定义servlet名，用该名指代下面的类 -->
        <servlet-class>com.mobao.servlet.HelloServlet</servlet-class>
        <load-on-startup>2</load-on-startup><!-- 服务器启动即初始化servlet，否则只用请求才会创建servlet -->
    </servlet>

    <servlet-mapping>
        <servlet-name>customServlet</servlet-name><!--自定义所对应的servlet 对应的调用url接口-->
        <url-pattern>/hello1</url-pattern>
    </servlet-mapping>

    <!--第二个servlet-->
    <servlet>
        <servlet-name>genericservlet</servlet-name>
        <servlet-class>com.mobao.servlet.GenericServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>genericservlet</servlet-name>
        <url-pattern>/hello2</url-pattern>
    </servlet-mapping>

</web-app>