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【Java Web】把逻辑名映射到servlet文件

Ⅰ、请求URL

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Ⅱ、容器搜索DD,查找servlet-mapping

<?xml version="1.0" encoding="ISO-8859-1" ?><web-app 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"         version="2.4">    <servlet>        <servlet-name>Ch3 Beer</servlet-name>        <servlet-class>com.example.web.BeerSelect</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Ch3 Beer</servlet-name>        <url-pattern>/SelectBeer.do</url-pattern>    </servlet-mapping></web-app>

Ⅲ、找到url-pattrern所对应的DD内部的servlet-name

    <servlet-mapping>        <servlet-name>Ch3 Beer</servlet-name>        <url-pattern>/SelectBeer.do</url-pattern>    </servlet-mapping>

Ⅳ、利用servlet-name查找对应的servlet

    <servlet>        <servlet-name>Ch3 Beer</servlet-name>        <servlet-class>com.example.web.BeerSelect</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Ch3 Beer</servlet-name>        <url-pattern>/SelectBeer.do</url-pattern>    </servlet-mapping>

Ⅴ、容器加载类,并初始化servlet(如果还没有初始化的话)

    <servlet>        <servlet-name>Ch3 Beer</servlet-name>        <servlet-class>com.example.web.BeerSelect</servlet-class>    </servlet>

Ⅵ、容器开启一个新线程处理并传递request(传递给servlet的service()方法)

 容器如何处理请求?

Ⅶ、容器把响应发回给客户

 

【Java Web】把逻辑名映射到servlet文件