Log4j pattern format explain:
%m 输出代码中指定的消息
%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 MMM dd HH:mm:ss,SSS}，输出类似：2002年10月18日 22：10：28，921
%l 输出日志事件的发生位置，包括类目名、发生的线程，以及在代码中的行数。
#log4j.properties sample
log4j.rootLogger = DEBUG, A1
log4j.appender.stdout.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
#日志文件 每日
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File=c:/mylog.txt
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
#%时间 [%线程] %log级别 %完整类名 - %消息 %换行
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
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