原本tomcat的日志格式如下：
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="%h %l %u %t "%r" %s %b" resolveHosts="false"/>

我们要在日志中显示时间的话，需要添加%T：

下面表是tomcat日志格式各值代表的意思：
Values Description

  • %a Remote IP address
  • %A Local IP address
  • %b Bytes sent, excluding HTTP headers, or '' if zero
  • %B Bytes sent, excluding HTTP headers
  • %h Remote hostname (or IP address if enableLookups for the connector isfalse)
  • %H Request protocol
  • %l Remote logical username from identd
  • %m Request method (GET, POST, and so on)
  • %p Local port on which this request was received
  • %q Query string (prepended with a '?' if it exists)
  • %r First line of the request (method and request URI)
  • %s HTTP status code of the response
  • %S User session ID
  • %t Date and time, in Common Log format
  • %u Remote user that was authenticated (if any)
  • %U Requested URL path
  • %v Local server name
  • %D Time taken to process the request, in milliseconds
  • %T Time taken to process the request, in seconds
  • %I Current request thread name (can compare later with stack t