Tomcat是如何运行的？整体架构又是怎样的？

何运复制<Server port="8006" shutdown="SHUTDOWN">    <Service name="Catalina">      <Connector port="8080" protocol="HTTP/1.1"                connectionTimeout="20000"                redirectPort="8443" />      <Connector port="8010" protocol="AJP/1.3" redirectPort="8443" />      <Engine name="Catalina" defaultHost="localhost">        <Realm className="org.apache.catalina.realm.LockOutRealm">          <Realm className="org.apache.catalina.realm.UserDatabaseRealm"                resourceName="UserDatabase"/>        </Realm>        <Host name="localhost"  appBase="webapps"       </Host>      </Engine>    </Service>  </Server>  1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.