SpringBoot logback从配置中心读取属性

一、前言

这篇文章https://www.jianshu.com/p/9be945a1c318中我详细描述了Spring Boot中如何配置logback日志。在最近的项目中，有这样一个需求：日志信息要使用日志搜集模块进行收集并存入mongodb数据库，所以在日志配置文件中我们必须传入mongodb的配置信息。

二、解决问题

1. 官网描述
   
   

   根据官网的描述可以得到这样的信息：logback.xml加载早于application.yml，如果直接通过${参数key}的形式获取是无法获取到对应参数值的。解决的方法是：

   <springProperty scope="context" name="mongo.host" source="spring.data.mongodb.host"/>

   source指定的是application.yml配置文件中key,其它地方直接用${mongo.host}引用这个值。但是，相关的属性信息必须放在内部配置文件中，无法从配置中心的配置文件中读取。经过网上收集资料，最后认定可能是这个原因：logback.xml和logback-spring.xml名称为这两个的配置文件，SpringBoot默认为logback的配置文件，那么SpringBoot会在从配置中心获取信息之前就进行加载，这样就会读不到配置中心的属性。

2. 解决方案
   经过fq搜索,在一个论坛里发现了解决方案：自定义logback配置文件的名称（不是SpringBoot默认的两种名称）并在配置中心指定logback配置文件的位置。这样SpringBoot就不会在获取配置中心的配置前加载日志配置了。经过测试，完美解决问题。

   • 配置中心配置

     
     #mongodb配置
     
     spring.data.mongodb.host=192.168.10.58
     spring.data.mongodb.database=ibase2job
     spring.data.mongodb.port=27017
     
     #日志配置
     
     logging.config=classpath:logback-custom.xml

   • 日志配置logback-custom.xml

     
     <configuration>
     <property name="logRoot" value="D:/logs"/>
     <property name="logModule" value="demo"/>
     
     <springProperty scope="context" name="mongo.host" source="spring.data.mongodb.host"/>
     <springProperty scope="context" name="mongo.port" source="spring.data.mongodb.port"/>
     <springProperty scope="context" name="mongo.database" source="spring.data.mongodb.database"/>
     <appender name="INVOKELOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
         <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
           <marker>INVOKEmarker>
         evaluator>
         <OnMismatch>DENYOnMismatch>
         <OnMatch>NEUTRALOnMatch>
       filter>
       <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
         <fileNamePattern>${logRoot}/${logModule}/invokeLog/%d{yyyy-MM-dd}.logfileNamePattern>
       rollingPolicy>
       <encoder>
          <pattern>%d{yyyy-MM-dd HH:mm:ss.SSSS} [requestUrl: %X{REQUESTURI}] [methodName: %X{MNAME}] [args: %X{ARGS}] [userId: %X{UID}] [ip: %X{CLIENTID}] [%thread] %logger - %msg%npattern>
       encoder>
     appender>
     <appender name="EXECSQLOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
         <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
           <marker>SQLmarker>
         evaluator>
         <OnMismatch>DENYOnMismatch>
         <OnMatch>NEUTRALOnMatch>
       filter>
       <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
         <fileNamePattern>${logRoot}/${logModule}/execsqlLog/%d{yyyy-MM-dd}.logfileNamePattern>
       rollingPolicy>
       <encoder>
         <pattern>%d{yyyy-MM-dd HH:mm:ss.SSSS} [methodName: %X{MNAME}] [args: %X{ARGS}] [sql: %X{SQL}] [table: %X{TABLE}] [userId: %X{UID}] [ip: %X{CLIENTID}] [%thread] %logger - %msg%npattern>
       encoder>
     appender>
     <appender name="EXCEPTIONLOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
         <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
           <marker>EXCEPTIONmarker>
         evaluator>
         <OnMismatch>DENYOnMismatch>
         <OnMatch>NEUTRALOnMatch>
       filter>
       <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
         <fileNamePattern>${logRoot}/${logModule}/exceptionLog/%d{yyyy-MM-dd}.logfileNamePattern>
       rollingPolicy>
       <encoder>
         <pattern>%d{yyyy-MM-dd HH:mm:ss.SSSS} [marker: %marker] [requestUrl: %X{REQUESTURI}] [methodName: %X{MNAME}] [args: %X{ARGS}] [userId: %X{UID}] [ip: %X{CLIENTID}] [%thread] %logger - %msg%n %expattern>
       encoder>
     appender>
     <appender name="PERFORMANCELOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
         <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
           <marker>PERFORMANCEmarker>
         evaluator>
         <OnMismatch>DENYOnMismatch>
         <OnMatch>NEUTRALOnMatch>
       filter>
       <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
         <fileNamePattern>${logRoot}/${logModule}/performanceLog/%d{yyyy-MM-dd}.logfileNamePattern>
       rollingPolicy>
       <encoder>
         <pattern>%d{yyyy-MM-dd HH:mm:ss.SSSS} [marker: %marker] [requestUrl: %X{REQUESTURI}] [methodName: %X{MNAME}]  [args: %X{ARGS}]  [userId: %X{UID}] [ip: %X{CLIENTID}] [%thread] [elapseTime: %X{ELAPSETIME}] %logger - %msg%npattern>
       encoder>
     appender>
     
     <appender name="JOBSCHEDULELOG" class="ch.qos.logback.core.rolling.RollingFileAppender">
       <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
         <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
           <marker>JOBSCHEDULEmarker>
         evaluator>
         <OnMismatch>DENYOnMismatch>
         <OnMatch>NEUTRALOnMatch>
       filter>
       <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
         <fileNamePattern>${logRoot}/${logModule}/jobscheduleLog/%d{yyyy-MM-dd}.logfileNamePattern>
       rollingPolicy>
       <encoder>
         <pattern>%d{yyyy-MM-dd HH:mm:ss.SSSS}  [marker: %marker]  [jobID: %X{JOBID}]  [jobStartTime: %X{JOBSTARTTIME}]  [jobRunTime: %X{JOBRUNTIME}] [jobRunResult: %X{JOBRUNRESULT}]   %logger - %msg%npattern>
       encoder>
     appender>
     
     
     <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
           
         <file>${logRoot}/${logModule}/errorLog/%d{yyyy-MM-dd}.logfile>
           
         <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
               
             <fileNamePattern>${logRoot}/${logModule}/errorLog/%d{yyyy-MM-dd}.log.zipfileNamePattern>
               
               <maxHistory>5maxHistory>
         rollingPolicy>
           
         <encoder>
             <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg [%file:%line] %npattern>
         encoder>
     appender>
     
     
     <appender name="MONGO_INVOKE" class="com.simon.logstatistics.service.MongoDBAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
              <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
                  <marker>INVOKEmarker>
              evaluator>
              <OnMismatch>DENYOnMismatch>
              <OnMatch>NEUTRALOnMatch>
          filter>
         <host>${mongo.host}host>
         <port>${mongo.port}port>
         <dbName>${mongo.database}dbName>
         <collectionName>log_invokecollectionName>
     appender>
     
     
     <logger name="com.simon.logstatistics.service" level="INFO">
         <appender-ref ref="INVOKELOG" />
         <appender-ref ref="EXCEPTIONLOG" />
         <appender-ref ref="PERFORMANCELOG" />
         <appender-ref ref="EXECSQLOG" />
         <appender-ref ref="JOBSCHEDULELOG" />
         <appender-ref ref="MONGO_INVOKE" />
     logger>
     
     
     <root level="INFO">
         <appender-ref ref="FILE" />
     root>
     configuration>