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This article mainly introduces the example analysis of stepping on the pit and filling the pit based on log4j2.properties. The article is very detailed and has a certain reference value. Interested friends must read it!

Log configuration of log4j2.properties trampling and filling

Facade mode: slf4j

Log library: log4j2

Introduce dependency: compile ('org.springframework.boot:spring-boot-starter-log4j2:2.0.4.RELEASE')

Mining pit

There is a problem with Multiple bindings were found on the class path when starting Application

Potholes: dependency on the default logback is not excluded

Fill in the hole: add to build.gradle:

Configurations {compile.exclude module: 'spring-boot-starter-logging'}

After startup, it is not output according to the configured format

Pothole: the path to the configuration file is not declared in application. [yml | properties]

Fill in: add to application.yml

# specify the location and name of the log4j2 configuration file logging: config: classpath:log4j2.properties format log output parameters

% m outputs the message specified in the code

% p output priority, i.e. DEBUG,INFO,WARN,ERROR,FATAL

% r output the number of milliseconds it took since the application was started to output the log information

% c outputs the category to which it belongs, which is usually the full name of the class

T outputs the name of the thread that generated the log event

% n outputs a carriage return newline character with "rn" for Windows platform and "n" for Unix platform

% d output the date or time of the log point in time. The default format is ISO8601, or you can specify the format after that, for example:% d {yyy MMM dd HH:mm:ss,SSS}. The output is similar: October 18, 2002, 22, 14, 10, 14, 28, 921.

% l outputs where the log event occurs, including the class name, the thread that occurred, and the number of lines in the code. For example: Testlog4.main (TestLog4.java:10)

% F the name of the file in which the output log message was generated

% L output line number in code

% x outputs the NDC (nested diagnostic environment) associated with the current thread, as in java servlets multiclient multithreaded applications

%% outputs a'% 'character

You can add modifiers between% and pattern characters to control its minimum width, maximum width, and text alignment. Such as:

% 5c: output category name with a minimum width of 5 category

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