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（每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.
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