Springboot-log4j2

一、配置项

1. 常用Appenders

2. pattern参数

3. pattern中%c的表达式

二、代码

1. pom.xml

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions><!-- 去掉springboot默认配置 -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency> <!-- 引入log4j2依赖 -->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

2. log4j2.xml

<Configuration status="error">
    <Properties>
        <Property name="log-path">logs</Property>
    </Properties>

    <Appenders>
        <Console name="console" target="SYSTEM_OUT">
            <PatternLayout pattern=" %highlight{%-5level} %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n" />
        </Console>

        <RollingRandomAccessFile name="info" fileName="${log-path}/info.log"
                     filePattern="${log-path}/info-%d{yyyy-MM-dd HH-mm}-%i.log">
            <PatternLayout>
                <pattern>[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n</pattern>
            </PatternLayout>
            <Policies>
                <!--每1小时/分/... 生成一个文件, 时间依据filePattern的配置-->
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="5 MB"/>
            </Policies>
            <DefaultRolloverStrategy max="30">
                <Delete basePath="${log-path}/$${date:yyyy-MM}/" maxDepth="2">
                    <IfFileName glob="*/*.log" />
                    <!--!Note: 这里的age必须和filePattern协调, 后者是精确到HH, 这里就要写成xH, xd就不起作用
                    另外, 数字最好>2, 否则可能造成删除的时候, 最近的文件还处于被占用状态,导致删除不成功!-->
                    <!--7天-->
                    <IfLastModified age="20m" />
                </Delete>
            </DefaultRolloverStrategy>

        </RollingRandomAccessFile>

        <RollingFile name="debug" fileName="${log-path}/debug.log"
                     filePattern="${log-path}/debug-%d{yyyy-MM-dd}.log">
            <PatternLayout>
                <pattern>[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n
                </pattern>
            </PatternLayout>
            <TimeBasedTriggeringPolicy interval="1">
            </TimeBasedTriggeringPolicy>
        </RollingFile>

        <RollingFile name="warn" fileName="${log-path}/warn.log"
                     filePattern="${log-path}/warn-%d{yyyy-MM-dd}.log">
            <PatternLayout>
                <pattern>[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n
                </pattern>
            </PatternLayout>
            <TimeBasedTriggeringPolicy/>
        </RollingFile>

        <RollingFile name="error" fileName="${log-path}/error.log"
                     filePattern="${log-path}/error-%d{yyyy-MM-dd}.log">
            <PatternLayout>
                <pattern>[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n
                </pattern>
            </PatternLayout>
            <TimeBasedTriggeringPolicy/>
        </RollingFile>
    </Appenders>

    <Loggers>
        <Logger name="log.controller.info" level="info" additivity="false">
            <appender-ref ref="info" />
        </Logger>
        <Logger name="log.controller.warn" level="warn" additivity="false">
            <appender-ref ref="warn" />
        </Logger>
        <Logger name="log.controller.error" level="error" additivity="false">
            <appender-ref ref="error" />
        </Logger>
        <Logger name="log.controller.debug" level="debug" additivity="false">
            <appender-ref ref="debug" />
        </Logger>
        <Root name="log.controller.debug" level="info">
            <AppenderRef ref="console" />
        </Root>
    </Loggers>
</Configuration>

详情参考这位大神的帖子，又详细的解释，https://www.cnblogs.com/keeya/p/10101547.html