IO模型

tomcat关于IO模型的设置在conf/server.xml中配置

• BIO
  protocol="org.apache.coyote.http11.Http11Protocol"
• NIO
  protocol="org.apache.coyote.http11.Http11NioProtocol"
• AIO
  protocol="org.apache.coyote.http11.Http11Nio2Protocol"
• APR
  protocol="org.apache.coyote.http11.Http11AprProtocol"
  例如

   <Connector port="8080" protocol="org.apache.coyote.http11.Http11Protocol"
               connectionTimeout="20000"
               redirectPort="8443" />

tomcat在8.5.X之后不在支持BIO模型
tomcat8之前默认是BIO, tomat8开始默认是nio模式

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