Tomcat知识点深入原理解析

Filter的执行原理

org.apache.catalina.core.ApplicationFilterChain#doFilter
==>
org.apache.catalina.core.ApplicationFilterChain#internalDoFilter
==>
javax.servlet.Servlet#service(最后可以看到调用了Servlet的service方法）

tomcat执行流程

Acceptor线程:监听socket，并将请求包装发送给poller线程

org.apache.tomcat.util.net.NioEndpoint.Acceptor

poller线程

org.apache.tomcat.util.net.NioEndpoint.Poller#run

org.apache.tomcat.util.net.NioEndpoint.Poller#run(这里是个while循环一直在获取Acceptor发送过来的连接请求）
==>
org.apache.tomcat.util.net.NioEndpoint.Poller#timeout
==>
org.apache.tomcat.util.net.AbstractEndpoint#processSocket (启动http线程，去真正处理请求)
==>
org.apache.tomcat.util.net.SocketProcessorBase#run
==>
org.apache.tomcat.util.net.NioEndpoint.SocketProcessor#doRun
==>
org.apache.coyote.AbstractProtocol.ConnectionHandler#process
==>
org.apache.coyote.AbstractProcessorLight#process
==>
org.apache.coyote.http11.Http11Processor#service
==>
org.apache.catalina.core.StandardWrapperValve#invoke
这里org.apache.catalina.core.ApplicationFilterFactory#createFilterChain 创建filter链