Introduction to SLF4 APIs and best practices

Add the following dependencies to the Pom file

<dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId>< Version>1.7.2</version></dependency><dependency><groupid>org.slf4j</groupid> <artifactId>slf4j-log4j12</artifactId><version>1.7.2</version></dependency>< Dependency><groupid>log4j</groupid><artifactid>log4j</artifactid><version> 1.2.17</version></dependency>

Log4j.properties Instructions for use

# Types of output levels ERROR, WARN, INFO, DEBUG

# Configure log information output destination, Log4j.appender.appenderName = Fully.qualified.name.of.appender.class

# # Org.apache.log4j.ConsoleAppender (console)

# # Org.apache.log4j.FileAppender (file)

# # Org.apache.log4j.DailyRollingFileAppender (Generate a log file every day)

# # Org.apache.log4j.RollingFileAppender (creates a new file when the file size reaches the specified size)

# # Org.apache.log4j.WriterAppender (send log information in stream format to any specified location)

# Configure the format of log information, log4j.appender.appenderName.layout = Fully.qualified.name.of.layout.class

# # Org.apache.log4j.HTMLLayout (layout in HTML table format)

# # Org.apache.log4j.PatternLayout (flexibility to specify layout mode)

# # Org.apache.log4j.DailyRollingFileAppender (Generate a log file every day)

# # Org.apache.log4j.SimpleLayout (contains level and information strings for log information)

# # Org.apache.log4j.TTCCLayout (contains information about the time, thread, category, etc.) of log generation

# Console Options

# # Threshold=debug: Specifies the lowest level of output for log messages.

# # Immediateflush=true: The default value is true, meaning that all messages will be output immediately.

# # Target=system.err: Default is: System.out, specify output console

# Fileappender Options

# # Threshold=debuf: Specifies the lowest level of output for log messages.

# # Immediateflush=true: The default value is true, meaning that all messages will be output immediately.

# # File=mylog.txt: Specifies the message output to the Mylog.txt file.

# # Append=false: The default value is True, the message is added to the specified file, and false means that the message is overwritten with the specified file content.

# Rollingfileappender Options

# # Threshold=debug: Specifies the lowest level of output for log messages.

# # Immediateflush=true: The default value is true, meaning that all messages will be output immediately.

# # File=mylog.txt: Specifies the message output to the Mylog.txt file.

# # Append=false: The default value is True, the message is added to the specified file, and false means that the message is overwritten with the specified file content.

# # maxfilesize=100kb: The suffix can be kb, MB or GB. When the log file reaches this size, it will automatically scroll to move the original content to the Mylog.log.1 file.

# # maxbackupindex=2: Specifies the maximum number of scrolling files that can be produced.

# The meaning that several symbols represent in the log Information format

# # x: x Information output when left-aligned;

# #%p: Output log information priority, i.e. Debug,info,warn,error,fatal,

#%d: the date or time of the output log time, the default format is ISO8601, can also be specified after the format, such as:%d{yyy MMM dd hh:mm:ss,sss}, output similar: October 18, 2002 22:10:28,921

#%c: Output log information belongs to the class, which is usually the full name of the class

# #%t: Output The name of the thread that generated the log event

# #%l: The location of the output log event, equivalent to the combination of%c.%m (%f:%l), including the class name, the thread that occurred, and the number of rows in the code

# #%l: line numbers in the output code

# #%m: Output The message specified in the code, resulting in the log specific information

# #%n: Output a carriage return line break, Windows platform is "\ r \ n", Unix platform for "\ n" Output log information wrapping

# Settings for custom classes category

Log4j.appender.fileout=org.apache.log4j.dailyrollingfileappender

Log4j.appender.fileout.encoding=utf-8

Log4j.appender.fileout.DatePattern = '. ' Yy-mm-dd HH ' \u65f6.log '

Log4j.appender.fileout.file=g:/log/jmoco_mag.log

Log4j.appender.fileout.layout=org.apache.log4j.patternlayout

LOG4J.APPENDER.FILEOUT.LAYOUT.CONVERSIONPATTERN=-[%D{YY-MM-DD HH:MM:SS}]<%P><%C>{\U4FE1\U606F\UFF1A %m}%n

Introduction to SLF4 APIs and best practices