gradle boot log4j2

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1. First remove the logback dependency and add the following in gradle

configurations {
	all*.exclude module: 'spring-boot-starter-logging'
    all*.exclude module: 'logback-classic'
    all*.exclude module: 'log4j-over-slf4j'
}

2. Add log4j2 dependency and log4j2 read yaml file dependency

compile ('org.springframework.boot:spring-boot-starter-log4j2')	
compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: '2.9.2'

3. Add the file log4j2.yaml below the classpath, the example content is as follows (Please ignore the prompt of Unknown property 'Configuration'). Change the package path and log write disk location by yourself

Configuration:  
  status: warn  
  
  Properties: # define global variables  
    Property: # Default configuration (for development environment). Other environments need to be specified in the VM parameters, as follows:  
      #测试：-Dlog.level.console=warn -Dlog.level.ccl=trace  
      #生产：-Dlog.level.console=warn -Dlog.level.ccl=info        
      - name: log.level.console  
        value: trace  
      - name: log.level.ccl  
        value: trace         
      - name: log.path  
        value: C:/logs  
      - name: project.name  
        value: my-spring-boot  
    
  Appenders:  
    Console: #Output to console  
      name: CONSOLE  
      target: SYSTEM_OUT  
      ThresholdFilter:  
        level: ${sys:log.level.console} # "sys:" means: if this variable value is not specified in the VM parameters, the default global variable value defined in this file is used  
        onMatch: ACCEPT  
        onMismatch: DENY  
      PatternLayout:  
        pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %X{user} %t (%F:%L) - %m%n"  
    RollingFile: # output to file, archive over 128MB  
      - name: ROLLING_FILE  
        ignoreExceptions: false  
        fileName: ${log.path}/${project.name}.log  
        filePattern: "${log.path}/$${date:yyyy-MM}/${project.name}-%d{yyyy-MM-dd}-%i.log.gz"  
        PatternLayout:  
          pattern: "%d{yyyy-MM-dd HH:mm:ss,SSS}:%4p %t (%F:%L) - %m%n"  
        Policies:  
          SizeBasedTriggeringPolicy:  
            size: "128 MB"  
        DefaultRolloverStrategy:  
          max: 1000  
  
  Loggers:  
    Root:  
      level: info  
      AppenderRef:  
        - ref: CONSOLE  
        - ref: ROLLING_FILE  
    Logger: # Configure a special log level for the com.ccl package to facilitate debugging  
      - name: com.ccl  
        additivity: false  
        level: ${sys:log.level.ccl}  
        AppenderRef:  
          - ref: CONSOLE  
          - ref: ROLLING_FILE  

4. Configure the output level in application.yaml. The following log is invalid for app startup (it is still valid in the test case):

At this time, refer to the name:value under [Define Global Variables] in log4j.yaml to configure the boot log.

logging:
  level:
    root: warn

5. Test Cases

import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.ccl.Application;

@SpringBootTest(classes = Application.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class Log4j2Test {

	private final Logger logger = LoggerFactory.getLogger(this.getClass());

	@Test
	public void test() throws Exception {
		MDC.put("user", "I don't live while driving, I'll find my brother when I'm in trouble.");//Corresponding to the %X{user} variable in the pattern of the configuration file
		logger.trace("I am trace log.");
		logger.debug("I am debug log.");
		logger.warn("I am warn log.");
		logger.error("I am error log.");
	}
}

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