SpringBoot整合Log4j2及配置步骤

<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>

<!--定义appender-->
<appenders>
    <!--控制台的输出配置-->
    <console name="Console" target="SYSTEM_OUT">
        <!-- 设置控制台只输出INFO及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) -->
        <ThresholdFilter level="INFO" onMatch="ACCEPT" onMismatch="DENY"/>
        <!--输出日志的格式-->
        <PatternLayout pattern="${log_pattern}"/>
    </console>

    <!-- 所有的日志信息会打印到此文件中，append=false每次启动程序会自动清空 -->
    <!-- <File name="all" fileName="${file_path}/all.log" append="true">
        <PatternLayout pattern="${log_pattern}"/>
    </File>-->
    <!--
    该RollingFile存储INFO级别的日志，
    默认存储到 fileName 文件中
    超过SizeBasedTriggeringPolicy的设定值，则存储到 filePattern 文件中
    -->
    <RollingFile name="RollingFileInfo" fileName="${file_path}/info.log" filePattern="${file_path}/${backup_folder}/info${backup_file_suffix}">
        <!--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"/>
        <!-- 写入日志文件的模板 -->
        <PatternLayout pattern="${log_pattern}"/>
        <Policies>
            <!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，超过该数量，会滚动删除前面的记录 -->
            <DefaultRolloverStrategy max="5">
				<Delete basePath="" maxDepth="">
					<IfFileName glob="*.log" />
					<IfLastModified age="*1d" />
				</Delete>
			</DefaultRolloverStrategy>
            <!--多长时间滚动一次-->
            <TimeBasedTriggeringPolicy interval="2 hour" />
            <!-- 一个日志文件的最大大小 -->
            <SizeBasedTriggeringPolicy size="${file_max_size}"/>
        </Policies>
    </RollingFile>
    <RollingFile name="RollingFileWarn" fileName="${file_path}/warn.log" filePattern="${file_path}/${backup_folder}/warn${backup_file_suffix}">
        <ThresholdFilter level="WARN" onMatch="ACCEPT" onMismatch="DENY"/>
        <PatternLayout pattern="${log_pattern}"/>
        <Policies>
            <TimeBasedTriggeringPolicy/>
            <SizeBasedTriggeringPolicy size="${file_max_size}"/>
        </Policies>
    </RollingFile>
    <RollingFile name="RollingFileError" fileName="${file_path}/error.log" filePattern="${file_path}/${backup_folder}/error${backup_file_suffix}">
        <ThresholdFilter level="ERROR" onMatch="ACCEPT" onMismatch="DENY"/>
        <PatternLayout pattern="${log_pattern}"/>
        <Policies>
            <TimeBasedTriggeringPolicy/>
            <SizeBasedTriggeringPolicy size="${file_max_size}"/>
        </Policies>
    </RollingFile>
</appenders>
<!-- 只有定义了logger并使用appender-ref，appender才会生效 -->
<loggers>
    <!--过滤掉spring和hibernate的一些无用的debug信息-->
    <logger name="org.springframework" level="INFO"/>
    <logger name="org.mybatis" level="INFO">
        <!-- 添加如下设置，控制台会再打印一次 -->
        <AppenderRef ref="Console"/>
    </logger>
    <root level="INFO">
        <appender-ref ref="Console"/>
        <appender-ref ref="RollingFileInfo"/>
        <appender-ref ref="RollingFileWarn"/>
        <appender-ref ref="RollingFileError"/>
    </root>
</loggers>

 %c%x - %m%n ：MyApp - Call com.foo.Bar.com.foo.Bar - Log in Bar MyApp - Return to MyApp.

@SpringBootApplication
public class SpringbootDemoApplication {
    private static final Logger log = org.slf4j.LoggerFactory.getLogger(SpringbootDemoApplication.class);
    public static void main(String[] args) {
        SpringApplication.run(SpringbootDemoApplication.class, args);
        log.error("Something else is wrong here");
        log.info("Something else is wrong here");
        log.warn("Something else is wrong here");
    }
}