Log4j.properties configuration details and examples-all tests pass

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#① configures the root logger with the following syntax:
#
#log4j. Rootlogger =[level],appendername,appendername2,...
#level是日志记录的优先级, divided into Off,trace,debug,info,warn,error,fatal,all
# #Log4j建议只使用四个级别, priority from low to High is debug,info,warn,error
#通过在这里定义的级别, you can control the switch to the corresponding level of log information in your application
#比如在这里定义了INFO级别, all debug-level log information in the application will not be printed
#appenderName就是指定日志信息输出到哪个地方. Multiple output purposes can be specified at the same time
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#② Configuration log information output destination Appender, its syntax is:
#
#log4j. Appender.appendername =fully.qualified.name.of.appender.class
#log4j. Appender.appenderName.optionN =valuen
#
#Log4j提供的appender有以下几种:
#1) Org.apache.log4j.ConsoleAppender (output to console)
#2) Org.apache.log4j.FileAppender (output to file)
#3) org.apache.log4j.DailyRollingFileAppender (Generate a log file every day)
#4) Org.apache.log4j.RollingFileAppender (a new file is generated when the file size reaches a specified size)
#5) Org.apache.log4j.WriterAppender (send log information to any specified place in streaming format)
#
#1) consoleappender Option Properties
#-threshold = DEBUG: Specifies the lowest level of output for log messages
#-immediateflush = true: The default value is true, all messages are immediately exported
#-target = System.err: Default value System.out, output to console (Err is red, out is black)
#
#2) fileappender Option Properties
#-threshold = INFO: Specifies the lowest level of output for log messages
#-immediateflush = true: The default value is true, all messages are immediately exported
#-file = C:\log4j.log: Specify message output to C:\log4j.log file
#-append = false: Default value True, append message to specified file, FALSE to overwrite the specified file contents
#-encoding = UTF-8: You can specify a file encoding format
#
#3) dailyrollingfileappender Option Properties
#-threshold = WARN: Specifies the lowest level of output for log messages
#-immediateflush = true: The default value is true and all messages are immediately exported
#-file =c:\log4j.log: Specify message output to C:\log4j.log file
#-append= false: Default value TRUE to append messages to the specified file, FALSE to overwrite the specified file contents
#-datepattern= '. ' YYYY-WW: Scrolls the file once a week, that is, a new file is generated each week. You can also use the following parameters:
#              '.' YYYY-MM: Monthly
#              '.' YYYY-WW: Weekly
#              '.' YYYY-MM-DD: Every day
#              '.' Yyyy-mm-dd-a: two times a day
#              '.' YYYY-MM-DD-HH: Per hour
#              '.' YYYY-MM-DD-HH-MM: Per minute
#-encoding = UTF-8: You can specify a file encoding format
#
#4) rollingfileappender Option Properties
#-threshold = ERROR: Specifies the lowest level of output for log messages
#-immediateflush = true: The default value is true and all messages are immediately exported
#-file =c:/log4j.log: Specify message output to C:/log4j.log file
#-append= false: Default value TRUE to append messages to the specified file, FALSE to overwrite the specified file contents
#-maxfilesize = 100KB: suffix can be kb,mb,gb. When the log file reaches that size, it will scroll automatically. For example: Log4j.log.1
#-maxbackupindex = 2: Specifies the maximum number of scrolling files that can be produced
#-encoding = UTF-8: You can specify a file encoding format
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#③ configures the format (layout) of the log information, and its syntax is:
#
#log4j. Appender.appendername.layout=fully.qualified.name.of.layout.class
#log4j. appender.appendername.layout.optionn= Valuen
#
The layout provided by the #Log4j are available in the following ways:
#5) org.apache.log4j.HTMLLayout (layout in HTML form)
#6) Org.apache.log4j.PatternLayout (flexibility to specify layout patterns)
#7) Org.apache.log4j.SimpleLayout (level and information string that contains log information)
#8) Org.apache.log4j.TTCCLayout (contains information about the time, thread, category, and so on that the log was generated)
#9) org.apache.log4j.xml.XMLLayout (layout in XML)
#
#5) htmllayout Option Properties
#-locationinfo = TRUE: Default value False, output Java file name and line number
#-title=struts LOG Message: Default value Log4jlog Messages
#
#6) patternlayout Option Properties
#-conversionpattern =%m%n: Format the specified message (with the parameter meaning below)
#
#9) xmllayout Option Properties
#-locationinfo = TRUE: Default value False, output Java file name and line number
#
#Log4J format the log information using a print format similar to the printf function in C, printing parameters as follows:
#%m the message specified in the output code
#%p output priority, i.e. Debug,info,warn,error,fatal
#%r output the number of milliseconds it takes to boot to output the log information
The class of the #%c output, which is usually the full name of the class in which it belongs
#%t output The name of the thread that generated the log event
#%n output a carriage return line feed, Windows platform "\ r \ n", UNIX platform "\ n"
#%d the date or time of the output log point in time, the default format is ISO8601, or you can specify the format later
# such as:%D{YYYY year mm month DD Day HH:MM:SS,SSS}, output similar: January 05, 2012 22:10:28,921
#%l where the output log event occurs, including the class name, the thread that occurred, and the number of lines in the code
# such as: Testlog.main (TESTLOG.JAVA:10)
#%f the name of the file where the output log message was generated
#%l the line number in the output code
#%x output is associated with the current line threads relative NDC (nested diagnostic environment), as in the application of Javaservlets multi-client multithreading
#%% output A "%" character
#
# You can control the minimum width, the maximum width, and the alignment of text by adding modifiers between% and pattern characters. Such as:
#%5c: Output category name, minimum width is 5,category<5, right justified by default
#%-5c: Output category name, minimum width is 5,category<5, "-" number specifies left alignment, there are spaces
#%.5c: Output category name, the maximum width is 5,category>5, will be left out of the characters to intercept, &LT;5 will not have spaces
#%20.30c:category name <20 fill space, and right aligned, >30 characters, from the left hand sold out characters cut off
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#④ Specifies the output-specific level of a particular package
#log4j. Logger.org.springframework=debug
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#OFF, Systemout,logfile,logdailyfile,logrollingfile,logmail,logdb,all.
Log4j.rootlogger=all,systemout,logfile,logdailyfile,logrollingfile,logmail,logdb

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