Tomcat笔记
Catalina - org.apache.catalina.startup.Catalina
Server - org.apache.catalina.core.StandardServer
Service - org.apache.catalina.core.StandardService
Connector - org.apache.catalina.connector.Connector
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|此部分根据不同请求协议实现有所不同，以下为Nio方式实现Http1.1协议
|ProtocolHandler - org.apache.coyote.http11.Http11NioProtocol
| AbstractEndpoint - org.apache.tomcat.util.net.NioEndpoint
| Acceptor - org.apache.tomcat.util.net.Acceptor - 接收socket请求
| NioEndpoint.Poller - org.apache.tomcat.util.net.NioEndpoint.Poller - NioSelector
| AbstractEndpoint.Handler - org.apache.coyote.AbstractProtocol.ConnectionHandler - NioHandler - 调用Processor.process处理socket请求
| Processor - org.apache.coyote.http11.Http11Processor - 从socket中获取请求数据并封装为Servlet请求、调用Adapter.service处理请求
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Adapter - org.apache.catalina.connector.CoyoteAdapter - 根据Servlet请求数据(url,method)匹配对应的Host、Context、Wrapper，并调用Engine责任链头开始处理数据
Engine - org.apache.catalina.core.StandardEngine
Pipeline - org.apache.catalina.core.StandardPipeline
Valve - org.apache.catalina.core.StandardEngineValve - 默认（最后一步）处理 - 调用Host的责任链头处理
Host - org.apache.catalina.core.StandardHost
Pipeline - org.apache.catalina.core.StandardPipeline
Valve - org.apache.catalina.core.StandardHostValve - 默认（最后一步）处理 - 调用Context的责任链头处理
Context - org.apache.catalina.core.StandardContext
Pipeline - org.apache.catalina.core.StandardPipeline
Valve - org.apache.catalina.core.StandardContextValve - 默认（最后一步）处理 - 调用Wrapper的责任链头处理
Wrapper - org.apache.catalina.core.StandardWrapper
Pipeline - org.apache.catalina.core.StandardPipeline
Valve - org.apache.catalina.core.StandardWrapperValve - 默认（最后一步）处理 - 找到Servlet和FilterChain，调用FilterChain.doFilter
FilterChain - org.apache.catalina.core.ApplicationFilterChain - 依次调用Filter.doFilter。如果结束，调用Servlet.service
Servlet - javax.servlet.Servlet