springboot5 嵌入式web容器

一、传统的Servlet容器：
Jetty：can be standalone or embedded instantiation.
Java1.7开始才有AIO的概念。
ASYNCHRONOUS HTTP SERVER
ASYNCHRONOUS CLIENT

Tomcat：
标准实现：
Servlet
JSP
Expression Language：
WebSocket：浏览器和服务器之间保持一个长连接。

二、Apache Tomcat
核心组件：Components
(1)Engine：
(2)Host:
(3)Context:

静态资源处理：org.apache.catalina.servlets.DefaultServlet
tomcat web.xml中的配置信息：

    <servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

welcome file list：

  <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>demo1.html</welcome-file>
    </welcome-file-list>

JSP处理：
org.apache.jasper.servlet.JspServlet

<servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>
            <param-name>fork</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>xpoweredBy</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>development</param-name>
            <param-value>false</param-value>
        </init-param>
        
        <load-on-startup>3</load-on-startup>
    </servlet>


    <servlet-mapping>
        <servlet-name>jsp</servlet-name>
        <url-pattern>*.jsp</url-pattern>
        <url-pattern>*.jspx</url-pattern>
    </servlet-mapping>

类加载：Classloading
双亲委派模型：

Bootstrap ClassLoader

System ClassLoader

Common ClassLoader

Webapp ClassLoader

连接器：Connectiors

JDBC数据源：DataSource

JNDI：Java Naming and Directory Interface

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