Log4j logs

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#①Configure the root Logger, its syntax is:
#
#log4j.rootLogger = [level],appenderName,appenderName2,...
#level is the priority of logging, divided into OFF, TRACE, DEBUG, INFO, WARN, ERROR, FATAL, ALL
##Log4j recommends using only four levels, the priority from low to high is DEBUG, INFO, WARN, ERROR
#By the level defined here, you can control the switch to the corresponding level of log information in the application
#For example, if the INFO level is defined here, all the log information of the DEBUG level in the application will not be printed out
#appenderName is to specify where the log information is output. Multiple output destinations can be specified at the same time
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#2 Configure the log information output destination Appender, its syntax is:
#
#log4j.appender.appenderName = fully.qualified.name.of.appender.class
# log4j.appender.appenderName.optionN = valueN
#
The appenders provided by #Log4j are as follows:
#1) org.apache.log4j.ConsoleAppender (output to console)
#2) org.apache.log4j.FileAppender (output to file)
#3) org.apache.log4j.DailyRollingFileAppender (generates a log file every day)
#4) org.apache.log4j.RollingFileAppender (a new file is generated when the file size reaches the specified size)
#5) org.apache.log4j.WriterAppender (send log information to any specified place in stream format)
#
#1) ConsoleAppender option property
# -Threshold = DEBUG: Specify the lowest level of output of log messages
# -ImmediateFlush = TRUE: The default value is true, all messages will be output immediately
# -Target = System.err: Default value System.out, output to console (err is red, out is black)
#
#2) FileAppender option property
# -Threshold = INFO: Specifies the lowest level of output of log messages
# -ImmediateFlush = TRUE: The default value is true, all messages will be output immediately
# -File = C:\log4j.log: Specify message output to C:\log4j.log file
# -Append = FALSE: The default value is true, append the message to the specified file, false means to overwrite the content of the specified file with the message
# -Encoding = UTF-8: You can specify the file encoding format
#
#3) DailyRollingFileAppender option property
# -Threshold = WARN: Specifies the lowest level of output for log messages
# -ImmediateFlush = TRUE: The default value is true, all messages will be output immediately
# -File = C:\log4j.log: Specify message output to C:\log4j.log file
# -Append = FALSE: The default value is true, append the message to the specified file, false means to overwrite the content of the specified file with the message
# -DatePattern='.'yyyy-ww: Scroll the file once a week, that is, generate a new file every week. You can also use the following parameters:
# '.'yyyy-MM:monthly
# '.'yyyy-ww: weekly
# '.'yyyy-MM-dd: every day
# '.'yyyy-MM-dd-a: twice a day
# '.'yyyy-MM-dd-HH: every hour
# '.'yyyy-MM-dd-HH-mm: every minute
# -Encoding = UTF-8: You can specify the file encoding format
#
#4) RollingFileAppender option property
# -Threshold = ERROR: Specifies the lowest level of output for log messages
# -ImmediateFlush = TRUE: The default value is true, all messages will be output immediately
# -File = C:/log4j.log: Specify the message output to the C:/log4j.log file
# -Append = FALSE: The default value is true, append the message to the specified file, false means to overwrite the content of the specified file with the message
# -MaxFileSize = 100KB: The suffix can be KB, MB, GB. When the log file reaches this size, it will be automatically rolled. For example: log4j.log.1
# -MaxBackupIndex = 2: Specify the maximum number of rolling files that can be generated
# -Encoding = UTF-8: You can specify the file encoding format
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#③Configure the format (layout) of the log information, its syntax is:
#
#log4j.appender.appenderName.layout = fully.qualified.name.of.layout.class
# log4j.appender.appenderName.layout.optionN = valueN
#
The layouts provided by #Log4j are as follows:
#5) org.apache.log4j.HTMLLayout (layout in HTML form)
#6) org.apache.log4j.PatternLayout (the layout pattern can be specified flexibly)
#7) org.apache.log4j.SimpleLayout (contains the level and information string of log information)
#8) org.apache.log4j.TTCCLayout (including log generation time, thread, category, etc.)
#9) org.apache.log4j.xml.XMLLayout (layout in XML)
#
#5) HTMLLayout Options Properties
# -LocationInfo = TRUE: default value false, output java file name and line number
# -Title=Struts Log Message: Default Log4J Log Messages
#
#6) PatternLayout Options Properties
# -ConversionPattern = %m%n: Format the specified message (parameter meaning below)
#
#9) XMLLayout Options Properties
# -LocationInfo = TRUE: default value false, output java file name and line number
#
#Log4J uses a print format similar to the printf function in C language to format log information. The print parameters are as follows:
# %m print the message specified in the code
# %p output priority, ie DEBUG,INFO,WARN,ERROR,FATAL
# %r Output the number of milliseconds it took to output the log information since the application was started
# %c The category to which the output belongs, usually the full name of the category
# %t output the name of the thread that generated the log event
# %n output a carriage return line feed, "\r\n" for Windows platform, "\n" for Unix platform
# %d The date or time of the output log time point, the default format is ISO8601, and the format can also be specified after
# Such as: %d{yyyy year MM month dd day HH:mm:ss,SSS}, the output is similar: 2012-01-05 22:10:28,921
# %l Output the location of the log event, including the category name, the thread where it occurred, and the number of lines in the code
# Testlog.main(TestLog.java:10)
# %F The name of the file where the output log message was generated
# %L line number in output code
# %x output the NDC (Nested Diagnostic Environment) associated with the current thread, in multi-client multi-threaded applications like java servlets
# %% output a "%" character
#
# Modifiers can be added between the % and the pattern character to control the minimum width, maximum width, and alignment of the text. Such as:
# %5c: output category name, the minimum width is 5, category<5, right-aligned by default
# %-5c: Output category name, the minimum width is 5, category<5, "-" sign specifies left alignment, there will be spaces
# %.5c: Output category name, the maximum width is 5, category>5, the extra characters on the left will be truncated, <5 will not have spaces
# %20.30c:category name < 20 fill spaces, and right-aligned, > 30 characters, truncate the characters that are exported from the left
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#④Specify the output specific level of a specific package
#log4j.logger.org.springframework=DEBUG
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#OFF,systemOut,logFile,logDailyFile,logRollingFile,logMail,logDB,ALL
log4j.rootLogger =ERROR,logFile

# output to console
#log4j.appender.systemOut = org.apache.log4j.ConsoleAppender
#log4j.appender.systemOut.layout = org.apache.log4j.PatternLayout
#log4j.appender.systemOut.layout.ConversionPattern = [%-5p][%-22d{yyyy/MM/dd HH:mm:ssS}][%l]%n%m%n
#log4j.appender.systemOut.Threshold = DEBUG
#log4j.appender.systemOut.ImmediateFlush = TRUE
#log4j.appender.systemOut.Target = System.out

# output to file
log4j.appender.logFile = org.apache.log4j.FileAppender
log4j.appender.logFile.layout = org.apache.log4j.PatternLayout
log4j.appender.logFile.layout.ConversionPattern = [%-5p][%-22d{yyyy/MM/dd HH:mm:ssS}][%l]%n%m%n
log4j.appender.logFile.Threshold = DEBUG
log4j.appender.logFile.ImmediateFlush = TRUE
log4j.appender.logFile.Append = TRUE
log4j.appender.logFile.File = ../logs/test.log
log4j.appender.A2.MaxBackupIndex=2
log4j.appender.logFile.Encoding = UTF-8

#Press DatePattern to output to file
#log4j.appender.logDailyFile = org.apache.log4j.DailyRollingFileAppender
#log4j.appender.logDailyFile.layout = org.apache.log4j.PatternLayout
#log4j.appender.logDailyFile.layout.ConversionPattern = [%-5p][%-22d{yyyy/MM/dd HH:mm:ssS}][%l]%n%m%n
#log4j.appender.logDailyFile.Threshold = DEBUG
#log4j.appender.logDailyFile.ImmediateFlush = TRUE
#log4j.appender.logDailyFile.Append = TRUE
#log4j.appender.logDailyFile.File = ../test.log
#log4j.appender.logDailyFile.DatePattern = '.'yyyy-MM-dd-HH-mm'.log'
#log4j.appender.logDailyFile.Encoding = UTF-8

#Set the file size to output to a file
#log4j.appender.logRollingFile = org.apache.log4j.RollingFileAppender
#log4j.appender.logRollingFile.layout = org.apache.log4j.PatternLayout
#log4j.appender.logRollingFile.layout.ConversionPattern = [%-5p][%-22d{yyyy/MM/dd HH:mm:ssS}][%l]%n%m%n
#log4j.appender.logRollingFile.Threshold = DEBUG
#log4j.appender.logRollingFile.ImmediateFlush = TRUE
#log4j.appender.logRollingFile.Append = TRUE
#log4j.appender.logRollingFile.File = ../test.log
#log4j.appender.logRollingFile.MaxFileSize = 1MB
#log4j.appender.logRollingFile.MaxBackupIndex = 10
#log4j.appender.logRollingFile.Encoding = UTF-8