Spring+Struts2+Mybatis+Log4j2配置

1. 添加以下slf4j和log4j2的依赖

            <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.28</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.slf4j/jcl-over-slf4j -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>jcl-over-slf4j</artifactId>
                <version>1.7.28</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
                <version>2.12.1</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core -->
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
                <version>2.12.1</version>
            </dependency>
            <!-- mybatis需要 -->
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>

2. log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <properties>
        <property name="LOG_HOME">/usr/local/tomcatLogs</property>
    </properties>

    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="[%d{DEFAULT}{GMT+8} [%p] - %l - %m%n"/>
        </Console>

        <!-- 这个会打印出所有的info及以下级别的信息，每次大小超过size，则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档-->
        <RollingFile name="RollingFileInfo" fileName="${LOG_HOME}/info.log"
                     filePattern="${LOG_HOME}/info-%d{yyyy-MM-dd}-%i.log">
            <!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch）-->
            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="[%d{DEFAULT}{GMT+8} [%p] - %l - %m%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy/>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
        </RollingFile>

        <RollingFile name="RollingFileWarn" fileName="${LOG_HOME}/warn.log"
                     filePattern="${LOG_HOME}/warn-%d{yyyy-MM-dd}-%i.log">
            <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="[%d{DEFAULT}{GMT+8} [%p] - %l - %m%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy/>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
            <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 -->
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>

        <RollingFile name="RollingFileError" fileName="${LOG_HOME}/error.log"
                     filePattern="${LOG_HOME}/error-%d{yyyy-MM-dd}-%i.log">
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="[%d{DEFAULT}{GMT+8} [%p] - %l - %m%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy/>
                <SizeBasedTriggeringPolicy size="10 MB"/>
            </Policies>
        </RollingFile>
    </Appenders>

    <!--然后定义logger，只有定义了logger并引入的appender，appender才会生效-->
    <Loggers>
        <!--过滤掉spring和mybatis的一些无用的DEBUG信息-->
        <logger name="org.springframework" level="INFO"></logger>
        <logger name="org.mybatis" level="INFO"></logger>
        <logger name="com.opensymphony.xwork2" level="INFO"></logger>
        <logger name="org.apache.struts2" level="INFO"></logger>
        <root level="all">
            <appender-ref ref="Console"/>
            <appender-ref ref="RollingFileInfo"/>
            <appender-ref ref="RollingFileWarn"/>
            <appender-ref ref="RollingFileError"/>
        </root>
    </Loggers>
</Configuration>

3. mybatis-config.xml

<!--打印sql日志-->
    <settings>
        <setting name="logImpl" value="LOG4J2"/>
    </settings>

4. 参考文章

聊一聊log4j2配置文件log4j2.xml
官方文档