0. log4j2 快速入门

发表于 分类于 ， 
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dependencies {
  implementation 'org.apache.logging.log4j:log4j-api:2.20.0'
  implementation 'org.apache.logging.log4j:log4j-core:2.20.0'
}

实际生产中，我们往往需要 slf4j + log4j2 进行日志管理；就需要导入 slf4j 日志门面、log4j2 适配器；然后使用 slf4j 方法接口名称来输出日志。

log4j-slf4j-impl should be used with SLF4J 1.7.x releases or older.

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dependencies {
  implementation 'org.apache.logging.log4j:log4j-slf4j-impl:2.20.0'
}

log4j-slf4j2-impl should be used with SLF4J 2.0.x releases or newer.

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dependencies {
  implementation 'org.apache.logging.log4j:log4j-slf4j2-impl:2.20.0'
}

一个最简单的配置

log4j2.xml

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<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>