springboot配置logback打印指定业务日志到单独文件

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博客介绍了通过配置appender和logger，在类文件中利用logger名称实现一类业务日志的方法。以logback - spring.xml文件为例，appender为crawlerUserAppender，logger为crawlerUser，还说明了通过日志名称获取Logger对象并写入文件的操作。

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="false" debug="false">
    <springProperty scop="context" name="spring.application.name" source="spring.application.name" defaultValue="app"/>
    <property name="log.home" value="logs"/>
    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} ---> [%thread] ---> %-5level %logger{50} - %msg%n</pattern>
        </layout>
    </appender>

    <appender name="appLogAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.home}/${spring.application.name}.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log.home}/${appName}-%d{yyyy-MM-dd}-%i.log</fileNamePattern>
            <MaxHistory>365</MaxHistory>
            <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>100MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [ %thread ] - [ %-5level ] [ %logger{50} : %line ] - %msg%n</pattern>
        </layout>
    </appender>

    <!--采集业务日志写入组件-->
    <appender name="crawlerUserAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>${log.home}/crawler.log</File>
        <append>true</append>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
<!--            <onMatch>ACCEPT</onMatch>-->
<!--            <onMismatch>DENY</onMismatch>-->
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log.home}/crawler.log.%d</fileNamePattern>
            <maxHistory>12</maxHistory>
        </rollingPolicy>
        <encoder charset="UTF-8">
            <pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] %level [%thread] %file:%line - %msg%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!--采集业务日志名称及组件配置-->
    <logger name="crawlerUser" additivity="false">
        <appender-ref ref="crawlerUserAppender"/>
    </logger>

    <root level="info">
        <appender-ref ref="stdout"/>
        <appender-ref ref="appLogAppender"/>
    </root>
</configuration>

整体实现上，通过配置一个appender、logger，然后在类文件中通过logger名称可以实现一类业务日志。

上述的logback-spring.xml文件中appender为crawlerUserAppender；logger为crawlerUser，在类中调用方式如下：

private static Logger crawlerLogger = LoggerFactory.getLogger("crawlerUser");

通过日志名称来获取Logger对象，写入文件中，写入的数据示例如下，

[2021-06-02 14:33:52.963] INFO [http-nio-18002-exec-1] TestController.java:55 - 请求getUserList()方法，请求参数：18, 参数名称：xxx
[2021-06-02 14:34:03.084] INFO [http-nio-18002-exec-2] TestController.java:32 - 请求test()方法
[2021-06-02 14:35:17.924] INFO [http-nio-18002-exec-5] TestController.java:43 - 请求getUserListByPage()方法