spring boot log4j2 配置

【传送门】：log4j官网配置文件详解

1. 排除 spring boot 自带的  spring-boot-starter-logging 依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <!-- remove log4j -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

2. 添加spring-boot-log4j2 依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
        <!--如果配置文件为yaml格式，则还需添加如下依赖-->
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
            <version>2.9.7</version>
        </dependency>

3. log4j.xml配置示例

<?xml version="1.0" encoding="UTF-8"?>
<!--日志级别以及优先级排序: OFF > FATAL > ERROR > WARN > INFO > DEBUG > TRACE > ALL -->
<!-- status log4j2 内部日志级别 -->
<configuration status="INFO">
    
    <!-- 全局参数 -->
    <Properties>
        <Property name="pattern">[%p] %d{yyyy-MM-dd HH:mm:ss,SSS} [%t] %l : %m%n</Property>
        <Property name="logHome">logs</Property>
        <Property name="displayName">monitor-server</Property>
    </Properties>

    <Appenders>
        
        <Console name="console" target="SYSTEM_OUT" follow="true">
            <PatternLayout>
                <pattern>${pattern}</pattern>
            </PatternLayout>
        </Console>
        
        <!-- 文件 每次运行程序会自动清空，由append属性决定 -->
        <File name="error" fileName="${loghome}/${displayName}_error.log" append="false">
            <!-- 指定error 级别的日志 -->
            <ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout>
                <pattern>${pattern}</pattern>
            </PatternLayout>
        </File>
        
        <!-- 滚动文件 -->
        <RollingFile name="rollingFile" fileName="${logHome}/${displayName}.log" filePattern="${logHome}/${displayName}_%d{yyyy-MM-dd}.log">
            <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout>
                <pattern>${pattern}</pattern>
            </PatternLayout>
            <!-- 按大小划分 -->
            <Policies>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
        </RollingFile>  
    </Appenders>

    <Loggers>
        <Logger name="org.springframework" level="WARN" additivity="false">
            <AppenderRef ref="console"/>
        </Logger>

        <Logger name="com.skd.server" level="info" additivity="false">
            <AppenderRef ref="console"></AppenderRef>
            <AppenderRef ref="error"></AppenderRef>
            <AppenderRef ref="rollingFile"></AppenderRef>
        </Logger>
        <!--日志信息输出的最低级别-->
        <Root level="debug">
        </Root>
    </Loggers>
</configuration>