Log4j提供的layout有以下几种
org.apache.log4j.HTMLLayout(以HTML表格形式布局),
org.apache.log4j.PatternLayout(可以灵活地指定布局模式),
org.apache.log4j.SimpleLayout(包含日志信息的级别和信息字符串),
org.apache.log4j.TTCCLayout(包含日志产生的时间、线程、类别等等信息)
HTMLLayout实例,我们把前面的实例的配置文件改下
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#Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.HTMLLayout |
我们运行 看下输出信息:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> < html > < head > < title >Log4J Log Messages</ title > < style type = "text/css" > <!-- body, table {font-family: arial,sans-serif; font-size: x-small;} th {background: #336699; color: #FFFFFF; text-align: left;} --> </ style > </ head > < body bgcolor = "#FFFFFF" topmargin = "6" leftmargin = "6" > < hr size = "1" noshade> Log session start time Wed Mar 29 10:17:41 CST 2017< br > < br > < table cellspacing = "0" cellpadding = "4" border = "1" bordercolor = "#224466" width = "100%" > < tr > < th >Time</ th > < th >Thread</ th > < th >Level</ th > < th >Category</ th > < th >Message</ th > </ tr > < tr > < td >0</ td > < td title = "main thread" >main</ td > < td title = "Level" >INFO</ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >普通Info信息</ td > </ tr > < tr > < td >16</ td > < td title = "main thread" >main</ td > < td title = "Level" >< font color = "#339933" >DEBUG</ font ></ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >调试debug信息</ td > </ tr > < tr > < td >16</ td > < td title = "main thread" >main</ td > < td title = "Level" >< font color = "#993300" >< strong >ERROR</ strong ></ font ></ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >报错error信息</ td > </ tr > < tr > < td >16</ td > < td title = "main thread" >main</ td > < td title = "Level" >< font color = "#993300" >< strong >WARN</ strong ></ font ></ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >警告warn信息</ td > </ tr > < tr > < td >16</ td > < td title = "main thread" >main</ td > < td title = "Level" >< font color = "#993300" >< strong >FATAL</ strong ></ font ></ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >严重错误fatal信息</ td > </ tr > < tr > < td >16</ td > < td title = "main thread" >main</ td > < td title = "Level" >< font color = "#993300" >< strong >ERROR</ strong ></ font ></ td > < td title = "com.open1111.Test category" >com.open1111.Test</ td > < td title = "Message" >报错信息</ td > </ tr > < tr >< td bgcolor = "#993300" style = "color:White; font-size : xx-small;" colspan = "6" >java.lang.IllegalArgumentException: 非法参数 < br > at com.open1111.Test.main(Test.java:16) </ td ></ tr > |
标准的html table表格格式,显示信息包括 线程 等级 类 报错信息;
PatternLayout是我们以后推荐使用的,很灵活;
有个ConversionPattern属性,灵活配置输出属性:
%m 输出代码中指定的消息;
%M 输出打印该条日志的方法名;
%p 输出优先级,即DEBUG,INFO,WARN,ERROR,FATAL;
%r 输出自应用启动到输出该log信息耗费的毫秒数;
%c 输出所属的类目,通常就是所在类的全名;
%t 输出产生该日志事件的线程名;
%n 输出一个回车换行符,Windows平台为"rn”,Unix平台为"n”;
%d 输出日志时间点的日期或时间,默认格式为ISO8601,也可以在其后指定格式,比如:%d{yyyy-MM-dd HH:mm:ss,SSS},输出类似:2002-10-18 22:10:28,921;
%l 输出日志事件的发生位置,及在代码中的行数;
SimpleLayout简单布局:
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#Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.SimpleLayout |
运行输出:
INFO - 普通Info信息
DEBUG - 调试debug信息
ERROR - 报错error信息
WARN - 警告warn信息
FATAL - 严重错误fatal信息
ERROR - 报错信息
java.lang.IllegalArgumentException: 非法参数
at com.open1111.Test.main(Test.java:16)
只有级别和信息,确实简单
TTCCLayout我们测试下:
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#Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.TTCCLayout |
运行输出:
[main] INFO com.open1111.Test - 普通Info信息
[main] DEBUG com.open1111.Test - 调试debug信息
[main] ERROR com.open1111.Test - 报错error信息
[main] WARN com.open1111.Test - 警告warn信息
[main] FATAL com.open1111.Test - 严重错误fatal信息
[main] ERROR com.open1111.Test - 报错信息
java.lang.IllegalArgumentException: 非法参数
at com.open1111.Test.main(Test.java:16)
我们实际开发使用的是灵活的PatternLayout 其他的了解即可;