spring boot logback无感配置

spring boot1.5.x版本的日志配置一直有一个问题，就是不能直接通过yml配置文件进行日志文件大小进行动态和方便的配置。

怎么解决？直接在springboot项目的maven工程中的src/main/resources的目录下加入如下logback-spring.xml文件，logback-spring命名的logback配置文件在spring boot中加载的优先级是最高的，所以项目一起动就可以加载生效。

其中我在配置文件中添加了控制大小的变量。具体配置文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="false" scan="true" scanPeriod="60 seconds">
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    <include resource="org/springframework/boot/logging/logback/console-appender.xml"/>
    <contextName>logback</contextName>

    <springProperty scope="logback" name="LOG_LEVEL" source="logging.logLevel" defaultValue="info" />

    <springProperty scope="logback" name="APP_NAME" source="spring.application.name" defaultValue="" />

    <springProperty scope="logback" name="PATTERN_FILE" source="logging.pattern.file" defaultValue="%d{yyyy-MM-dd HH:mm:ss.SSS} ${LOG_LEVEL_PATTERN:-%5p} ${PID:- } --- [%t] %-40.40logger{39} : %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}" />

    <springProperty scope="logback" name="MAX_FILESIZE" source="logging.maxfilesize" defaultValue="100MB" />

    <property name="LOG_FILE" value="${LOG_FILE:-${LOG_PATH:-${LOG_TEMP:-${java.io.tmpdir:-/tmp}}}/${APP_NAME}.log}"/>

    <appender name="FILE"
        class="ch.qos.logback.core.rolling.RollingFileAppender">

        <file>${LOG_FILE}</file>

        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>
                ${PATTERN_FILE}
            </pattern>
        </layout>

        <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
            <fileNamePattern>${LOG_FILE}.%i</fileNamePattern>
            <!-- <maxHistory>${maxhistory}</maxHistory> -->
        </rollingPolicy>
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>${MAX_FILESIZE}</maxFileSize>
        </triggeringPolicy>

    </appender>

    <root level="${LOG_LEVEL}">
        <appender-ref ref="FILE" />
        <appender-ref ref="CONSOLE" />
    </root>
</configuration>

同时还在yml文件中加入了对应的配置标签

logging:
  file: ../logs/aaaaa.log
  maxfilesize: 100MB
  logLevel: info

maxfilesize为自定义标签，进行设置每个日志文件的大小

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