工作中有些业务模块日志输出比较频繁，影响其他业务模块问题排查，可以使用logback实现根据不同的业务输出到不同的日志文件

1、在resource下创建文件logback-spring.xml

2、在logback.xml中添加如下配置

<?xml version="1.0" encoding="UTF-8"?>

<configuration debug="false" scan="false">
    <springProperty scop="context" name="spring.application.name" source="spring.application.name"
                    defaultValue="atm-at-web"/>
    <property name="log.path" value="logs/${spring.application.name}"/>
    <!-- Console log output -->
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{MM-dd HH:mm:ss.SSS} %-5level [%logger{50}] - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Log file info output -->
    <appender name="info" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.path}/info.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${log.path}/%d{yyyy-MM}/info.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
            <maxFileSize>10MB</maxFileSize>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level [%logger{50}] %file:%line - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Log file error output -->
    <appender name="error" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.path}/error.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${log.path}/%d{yyyy-MM}/error.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
            <maxFileSize>10MB</maxFileSize>
            <maxHistory>30</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level [%logger{50}] %file:%line - %msg%n</pattern>
        </encoder>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
        </filter>
    </appender>

    <!-- Log file extApi output -->
    <appender name="extApiAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log.path}/extApi.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>${log.path}/%d{yyyy-MM}/extApi.%d{yyyy-MM-dd}.%i.log.gz</fileNamePattern>
            <maxFileSize>10MB</maxFileSize>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level [%logger{50}] %file:%line - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Level: FATAL 0  ERROR 3  WARN 4  INFO 6  DEBUG 7 -->
    <root level="INFO">
        <appender-ref ref="console"/>
        <appender-ref ref="info"/>
        <appender-ref ref="error"/>
    </root>

    <logger name="extApi" additivity="false" level="INFO">
        <appender-ref ref="console"/>
        <appender-ref ref="extApiAppender"/>
    </logger>

</configuration>

PS：我们定义了一个名为 extApi 的appender，在相关业务代码中，我们还需要定义一个logger与它绑定。

private final static Logger extApiLogger = LoggerFactory.getLogger("extApi");

3、日志文件