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1.log4j有三种主要组件:logger、appender and layout2.Log4j提供的appender有以下几种:org.apache.log4j.ConsoleAppender(控制台)org.apache.log4j.FileAppender(文件)org.apache.log4j.DailyRollingFileAppender(天天产生一个日志文件)org.apache.log4j.RollingFileAppender(文件大小到达指定尺寸的时候产生一个新的文件)org.apache.log4j.WriterAppender(将日志信息以流格式发送到任意指定的地方)3.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)4.Log4j提供的几种输出格式:%M:Used to output the method name where the logging request was issued.%m:Used to output the application supplied message associated with the logging event.%l:Used to output location information of the caller which generated the logging event%L:Used to output the line number from where the logging request was issued.%p:Used to output the priority of the logging event.%n:Outputs the platform dependent line separator character or characters. %r:Used to output the number of milliseconds elapsed since the start of the application until the creation of the logging event.%F:Used to output the file name where the logging request was issued.%d:Used to output the date of the logging event. %c:Used to output the category of the logging event%C:Used to output the fully qualified class name of the caller issuing the logging request5.假如是对于效率要求比较高的话,要在log.debug()之前加上log.isDebugEnabled()进行判定,这样能够大大减少执行时间6.对于各个appenders,共有的属性是layout(一般设置为org.apache.log4j.PatternLayout),Threshold(Log的级别)(1)ConsoleAppender:Target(System.out和System.err)(2)FileAppender:File(定义输出的文件名),Append(定义是否为追加)(3)DailyRollingFileAppender(除FileAppender属性外):MaxFileSize(最大文件大小),MaxBackupIndex() 必要的时候可以参考一下:http://dev.csdn.net/develop/article/62/62201.shtm 返回类别: 教程 上一教程: 最简朴的java分页算法 下一教程: Mini Java编译器(五) 您可以阅读与"今天总算看完了log4j,心情不错!把自己的学习笔记拿出来给大家共享一把"相关的教程: · Java网络编程的学习笔记(二) · Java网络编程的学习笔记(一) · 学习笔记之 EQUALS() VS. == 和STRING对象的2种创建过程 · 扬扬的J2EE学习笔记(四)Platform Services平台服务 · Java学习笔记 |
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