<dependencies>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.14.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.14.0</version>
        </dependency>
    </dependencies>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">

    <!--全局參數(shù)-->
    <Properties>
        <Property name="pattern">%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L - %m%n</Property>
        <Property name="logDir">/data/logs/dust-server</Property>
    </Properties>

    <Loggers>
        <Root level="INFO">
            <AppenderRef ref="console"/>
            <AppenderRef ref="rolling_file"/>
        </Root>
    </Loggers>

    <Appenders>
        <!-- 定義輸出到控制臺(tái) -->
        <Console name="console" target="SYSTEM_OUT" follow="true">
            <!--控制臺(tái)只輸出level及以上級(jí)別的信息-->
            <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout>
                <Pattern>${pattern}</Pattern>
            </PatternLayout>
        </Console>
        <!-- 同一來(lái)源的Appender可以定義多個(gè)RollingFile，定義按天存儲(chǔ)日志 -->
        <RollingFile name="rolling_file"
                     fileName="${logDir}/dust-server.log"
                     filePattern="${logDir}/dust-server_%d{yyyy-MM-dd}.log">
            <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout>
                <Pattern>${pattern}</Pattern>
            </PatternLayout>
            <Policies>
                <TimeBasedTriggeringPolicy interval="1"/>
            </Policies>
            <!-- 日志保留策略，配置只保留七天 -->
            <DefaultRolloverStrategy>
                <Delete basePath="${logDir}/" maxDepth="1">
                    <IfFileName glob="dust-server_*.log" />
                    <IfLastModified age="7d" />
                </Delete>
            </DefaultRolloverStrategy>
        </RollingFile>
    </Appenders>
</Configuration>

//java項(xiàng)目 fhadmin.cn
public class Log4j2Demo {

    private static  final Logger LOGGER=LogManager.getLogger();
    public static void main(String[] args) {
        String username="${java:os}";

        LOGGER.info("Hello, {}",username);
    }
}