Tomcat日志格式自定义
设置日志显示信息格式，默认情况下，Tomcat的访问日志是不记录的。需要在serve.xml中修改配置，去掉注释。将注释去掉即可。
如果要调整日志记录的字段，需要修改pattern属性值，common是默认的属性，其值为： %h %l %u %t %r %s%b
各符号表示为（下面描述摘自Tomcat官方文档）：
*%a - Remote IP address
* %A - LocalIP address
* %b - Bytessent, excluding HTTP headers, or '-' if zero
* %B - Bytessent, excluding HTTP headers
* %h -Remote host name (or IP address if resolveHosts is false)
* %H -Request protocol
* %l -Remote logical username from identd (always returns '-')
* %m -Request method (GET, POST, etc.)
* %p - Localport on which this request was received
* %q - Querystring (prepended with a '?' if it exists)
* %r - Firstline of the request (method and request URI)
* %s - HTTPstatus code of the response
* %S - Usersession ID
* %t - Dateand time, in Common Log Format
* %u -Remote user that was authenticated (if any), else '-'
* %U -Requested URL path
* %v - Localserver name
* %D - Timetaken to process the request, in millis
* %T - Timetaken to process the request, in seconds
There is also support to write information from the cookie,incoming header,
the Session or something else in the ServletRequest. It ismodeled after the apache syntax:
*%{xxx}i for incomingheaders
*%{xxx}c for a specificcookie
*%{xxx}r xxx is an attribute inthe ServletRequest
*%{xxx}s xxx is an attribute inthe HttpSession
通常情况下，为便于分析网站瓶颈，将pattern=“%h %l %u %t "%r" %s %b%D”，其中D代表处理该请求所消耗的毫秒数，
如此可以方便找到问题，提高系统性能。
http://blog.sina.com.cn/s/blog_6c9a9a870100m2ak.html
http://blog.chinaunix.net/uid-20691565-id-3938220.html
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