| 1.log4j有三种主要组件：logger、appender and layout | | | | | |
| 2.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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