如果我使用log4j2，如何通过更改应用程序属性中的任何属性来更改Spring Boot项目（在生产环境中）中的日志级别

Question

我正在开发一个spring boot服务(2.1.7 spring boot版本），其中我使用log4j2建立日志及其模式：

    <?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" name="MyService">
    <Properties>
        <Property name="project.component">${bundle:bootstrap:project.component}</Property>
        <Property name="project.version">${bundle:bootstrap:project.version}</Property>
    </Properties>
    <Appenders>
        <Console name="main" target="SYSTEM_OUT">
            <PatternLayout
              pattern="%d{yyyy-MM-dd HH:mm:ss,SSSZ} ${project.component} ${project.version} - %msg%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Logger name="root" level="INFO">
            <AppenderRef ref="main" level="INFO"/>
        </Logger>
    </Loggers>
</Configuration>

Answer 1

我可以使用类似的配置来更改日志级别，甚至可以为日志配置一个模式：

# Set everything to be logged to the console
log4j.rootCategory=TRACE, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n

还可以设置每个类的日志级别,例如：

# Settings to quiet third party logs that are too verbose
log4j.logger.org.eclipse.jetty=WARN
log4j.logger.org.eclipse.jetty.util.component.AbstractLifeCycle=ERROR
log4j.logger.org.apache.spark.repl.SparkIMain$exprTyper=INFO
log4j.logger.org.apache.spark.repl.SparkILoop$SparkILoopInterpreter=INF
log4j.logger.org.apache.spark.sql.execution.streaming.FileStreamSource=TRACE