layout ConversionPattern

    %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 ：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。
    %x Used to output the NDC (nested diagnostic context) associated with the thread that generated the logging event
    %X Used to output the MDC (mapped diagnostic context) associated with the thread that generated the logging event for specified key
    

  %n - newline
  %m - your log message
  %p - message priority (FATAL, ERROR, WARN, INFO, DEBUG or custom)
  %r - millisecs since program started running
  %% - percent sign in output

  %c - name of your category (logger), %c{2} will outputs last two components
  %t - name of current thread
SLOW PERFORMANCE FORMATS
  %d - date and time, also %d{ISO8601}, %d{DATE}, %d{ABSOLUTE},
       %d{HH:mm:ss,SSS}, %d{dd MMM yyyy HH:mm:ss,SSS} and so on
       
  %l - Shortcut for %F%L%C%M
  %F - Java source file name
  %L - Java source line number
  %C - Java class name, %C{1} will output the last one component
  %M - Java method name



log4j.properties

# log4j.rootLogger=info, stdout, file

log4j.rootLogger=info,file

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=app.log

log4j.appender.file.MaxFileSize=10MB
# Keep one backup file
log4j.appender.file.MaxBackupIndex=3

log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MMM-dd HH:mm:ss,SSS} %p %t %c %l - %m %n



2019-四月-02 12:01:15,691 INFO qtp2134407557-19 dyyx.util.WebUtil dyyx.util.WebUtil.run(WebUtil.java:156) - 1554177015691_XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
2019-四月-02 12:01:16,144 INFO qtp2134407557-19 dyyx.util.WebUtil dyyx.util.WebUtil.run(WebUtil.java:156) - 1554177016144_XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
2019-四月-02 12:01:16,600 INFO qtp2134407557-19 dyyx.util.WebUtil dyyx.util.WebUtil.run(WebUtil.java:156) - 1554177016600_XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX