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logback配置中变量和include的应用方式

logback配置中变量和include的应用

logback配置在实际应用中往往会遇到appender的配置中存在大量的重复内容，但是logback又不像编程语言一样支持继承，采用include和变量结合可以一定程度上解决这个问题。

Example：

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

     < encoder >

         < charset >UTF-8</ charset >

         < pattern >%d{dd.MMM.yyyy HH:mm:ss.SSS z}, [%6t], %6p, %C:%M %m%n</ pattern >

     </ encoder >

     < file >${LOGS_DIR}/warn.log</ file >

     < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

         < maxFileSize >40MB</ maxFileSize >

     </ triggeringPolicy >

     < rollingPolicy class = "ch.qos.logback.core.rolling.FixedWindowRollingPolicy" >

         < fileNamePattern >${LOGS_DIR}/warn%i.log.gz</ fileNamePattern >

         < minIndex >1</ minIndex >

         < maxIndex >21</ maxIndex >

     </ rollingPolicy >

</ appender >

< appender class = "ch.qos.logback.classic.AsyncAppender" name = "Warn" >

     < queueSize >2048</ queueSize >

     < includeCallerData >true</ includeCallerData >

     < discardingThreshold >0</ discardingThreshold >

     < appender-ref ref = "WarnLogFile" />

     < filter class = "ch.qos.logback.classic.filter.ThresholdFilter" >

         < level >WARN</ level >

     </ filter >

</ appender >

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

     < encoder >

         < charset >UTF-8</ charset >

         < pattern >%d{dd.MMM.yyyy HH:mm:ss.SSS z}, [%6t], %6p, %C:%M %m%n</ pattern >

     </ encoder >

     < file >${LOGS_DIR}/info.log</ file >

     < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

         < maxFileSize >10MB</ maxFileSize >

     </ triggeringPolicy >

     < rollingPolicy class = "ch.qos.logback.core.rolling.FixedWindowRollingPolicy" >

         < fileNamePattern >${LOGS_DIR}/info%i.log.gz</ fileNamePattern >

         < minIndex >1</ minIndex >

         < maxIndex >21</ maxIndex >

     </ rollingPolicy >

</ appender >

< appender class = "ch.qos.logback.classic.AsyncAppender" name = "info" >

     < queueSize >2048</ queueSize >

     < includeCallerData >true</ includeCallerData >

     < discardingThreshold >0</ discardingThreshold >

     < appender-ref ref = "infoLogFile" />

     < filter class = "ch.qos.logback.classic.filter.ThresholdFilter" >

         < level >INFO</ level >

     </ filter >

</ appender >

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

     < encoder >

         < charset >UTF-8</ charset >

         < pattern >%d{dd.MMM.yyyy HH:mm:ss.SSS z}, [%6t], %6p, %C:%M %m%n</ pattern >

     </ encoder >

     < file >${LOGS_DIR}/debug.log</ file >

     < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

         < maxFileSize >5MB</ maxFileSize >

     </ triggeringPolicy >

     < rollingPolicy class = "ch.qos.logback.core.rolling.FixedWindowRollingPolicy" >

         < fileNamePattern >${LOGS_DIR}/debug%i.log.gz</ fileNamePattern >

         < minIndex >1</ minIndex >

         < maxIndex >21</ maxIndex >

     </ rollingPolicy >

</ appender >

< appender class = "ch.qos.logback.classic.AsyncAppender" name = "Debug" >

     < queueSize >2048</ queueSize >

     < includeCallerData >true</ includeCallerData >

     < discardingThreshold >0</ discardingThreshold >

     < appender-ref ref = "DebugLogFile" />

     < filter class = "ch.qos.logback.classic.filter.ThresholdFilter" >

         < level >DEBUG</ level >

     </ filter >

</ appender >

可以看到以上的三个定义存在大量的重复内容会导致logback文件很大，不容易维护，结合变量和include则可以一定程度上解决这个问题。

首先把配置内容抽取一个公共文件default.xml

把不同的内容用变量定义：

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< included >

     < appender class = "ch.qos.logback.core.rolling.RollingFileAppender" name = "${FILE_APPENDER}" >

         < encoder >

             < charset >UTF-8</ charset >

             < pattern >%d{dd.MMM.yyyy HH:mm:ss.SSS z}, [%6t], %6p, %C:%M %m%n</ pattern >

         </ encoder >

         < file >${LOGS_DIR}/${LOGFILE}.log</ file >

         < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

             < maxFileSize >5MB</ maxFileSize >

         </ triggeringPolicy >

         < rollingPolicy class = "ch.qos.logback.core.rolling.FixedWindowRollingPolicy" >

             < fileNamePattern >${LOGS_DIR}/${LOGFILE}%i.log.gz</ fileNamePattern >

             < minIndex >1</ minIndex >

             < maxIndex >21</ maxIndex >

         </ rollingPolicy >

     </ appender >

     < appender class = "ch.qos.logback.classic.AsyncAppender" name = "${ASYNC_APPENDER}" >

         < queueSize >2048</ queueSize >

         < includeCallerData >true</ includeCallerData >

         < discardingThreshold >0</ discardingThreshold >

         < appender-ref ref = "${FILE_APPENDER}" />

         < filter class = "ch.qos.logback.classic.filter.ThresholdFilter" >

             < level >${LOG_LEVEL}</ level >

         </ filter >

     </ appender >

</ included >

然后基于公共文件定义各自的配置

warn.xml：

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< included >

     < property scope = "local" name = "LOGFILE" value = "warn" />

     < property scope = "local" name = "FILE_APPENDER" value = "WarnLogFile" />

     < property scope = "local" name = "ASYNC_APPENDER" value = "warn" />

     < property scope = "local" name = "LOG_LEVEL" value = "WARN" />

    

     < include file = "${LOGS_CUSTOM_DIR}/default.xml" />

</ included >

info.xml：

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< included >

     < property scope = "local" name = "LOGFILE" value = "info" />

     < property scope = "local" name = "FILE_APPENDER" value = "InfoLogFile" />

     < property scope = "local" name = "ASYNC_APPENDER" value = "info" />

     < property scope = "local" name = "LOG_LEVEL" value = "INFO" />

    

     < include file = "${LOGS_CUSTOM_DIR}/default.xml" />

</ included >

debug.xml：

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< included >

     < property scope = "local" name = "LOGFILE" value = "debug" />

     < property scope = "local" name = "FILE_APPENDER" value = "DebugLogFile" />

     < property scope = "local" name = "ASYNC_APPENDER" value = "debug" />

     < property scope = "local" name = "LOG_LEVEL" value = "DEBUG" />

    

     < include file = "${LOGS_CUSTOM_DIR}/default.xml" />

</ included >

最后在logback.xml中就可以include上面定义的文件

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< include file = "${LOGS_CUSTOM_DIR}/warn.xml" />

< include file = "${LOGS_CUSTOM_DIR}/info.xml" />

< include file = "${LOGS_CUSTOM_DIR}/debug.xml" />

< root level = "DEBUG" >

     ...

     < appender-ref ref = "warn" />

     < appender-ref ref = "info" />

     < appender-ref ref = "debug" />

</ root >

logback.xml导入(include)其他项目配置的logback.xml文件

1、其他项目存在的logback.xml文件需要下面这种形式的配置 ​

下面的这个配置文件的意思是定义了两个appender,这两个appender中名为ASYNC-LOG的appender是将com.xx.cloud.trail.client.async路径下面产生的级别为error的日志进行收集，保存在定义的文件夹下面,另一个appender同理,如果这个logback.xml文件想在其他的项目中被引用那么就需要用在iucluded标签将定义的appender跟logger包围起来,表示这个是可以被导入其他项目的

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

     < included >

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

         < rollingPolicy class = "ch.qos.logback.core.rolling.TimeBasedRollingPolicy" >

             <!--日志文件输出的文件名-->

             < FileNamePattern >/var/log/xx/cloud/trail/async/error.log.%d{yyyy-MM-dd}.log</ FileNamePattern >

             < MaxHistory >30</ MaxHistory >

         </ rollingPolicy >

         < encoder

                 class = "ch.qos.logback.core.encoder.LayoutWrappingEncoder" >

             <!-- 日志输出编码 -->

             < layout class = "ch.qos.logback.classic.PatternLayout" >

                 <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->

                 < pattern >%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n

                 </ pattern >

             </ layout >

         </ encoder >

         <!--日志文件最大的大小-->

         < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

             < MaxFileSize >10MB</ MaxFileSize >

         </ triggeringPolicy >

     </ appender >

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

         < rollingPolicy class = "ch.qos.logback.core.rolling.TimeBasedRollingPolicy" >

             <!--日志文件输出的文件名-->

             < FileNamePattern >/var/log/xx/cloud/trail/aop/error.log.%d{yyyy-MM-dd}.log</ FileNamePattern >

             < MaxHistory >30</ MaxHistory >

         </ rollingPolicy >

         < encoder

                 class = "ch.qos.logback.core.encoder.LayoutWrappingEncoder" >

             <!-- 日志输出编码 -->

             < layout class = "ch.qos.logback.classic.PatternLayout" >

                 <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->

                 < pattern >%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n

                 </ pattern >

             </ layout >

         </ encoder >

         <!--日志文件最大的大小-->

         < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

             < MaxFileSize >10MB</ MaxFileSize >

         </ triggeringPolicy >

     </ appender >

     <!--需要将日志单独输出的包路径-->

     < logger name = "com.xx.cloud.trail.client.async" level = "ERROR" additivity = "false" >

         < appender-ref ref = "ASYNC_LOG" />

     </ logger >

     <!--需要将日志单独输出的包路径-->

     < logger name = "com.xx.cloud.trail.client.aop" level = "ERROR" additivity = "false" >

         < appender-ref ref = "AOP_LOG" />

     </ logger >

     </ included >

2、其他项目的配置

假如1中的配置logback.xml文件的名称为logback-trail.xml,那么需要在其他的项目的logback.xml文件中加入一句

表示导入其他项目的logback文件,这样就能将其他项目中的配置文件进行导入

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

<!--

     scan: 当此属性设置为true时，配置文件如果发生改变，将会被重新加载，默认值为true。

     scanPeriod: 设置监测配置文件是否有修改的时间间隔，如果没有给出时间单位，默认单位是毫秒。当scan为true时，此属性生效。默认的时间间隔为1分钟。

     debug: 当此属性设置为true时，将打印出logback内部日志信息，实时查看logback运行状态。默认值为false。

-->

< configuration scan = "true" scanPeriod = "60 seconds" debug = "false" >

     < include resource = "logback-trail.xml" />

     <!--配置日志输出到的路径-->

     < springProperty scop = "context" name = "logging.path" source = "logging.path"

                     defaultValue = "logging-path-not-find" />

     < property name = "log.path" value = "${logging.path}" />

     < appender name = "STDOUT" class = "ch.qos.logback.core.ConsoleAppender" >

         < encoder >

             < pattern >%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</ pattern >

         </ encoder >

     </ appender >

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

         < rollingPolicy class = "ch.qos.logback.core.rolling.TimeBasedRollingPolicy" >

             <!--日志文件输出的文件名-->

             < FileNamePattern >${logging.path}/trail/trail.log.%d{yyyy-MM-dd}.log</ FileNamePattern >

             < MaxHistory >30</ MaxHistory >

         </ rollingPolicy >

         < encoder

                 class = "ch.qos.logback.core.encoder.LayoutWrappingEncoder" >

             <!-- 日志输出编码 -->

             < layout class = "ch.qos.logback.classic.PatternLayout" >

                 <!--格式化输出：%d表示日期，%thread表示线程名，%-5level：级别从左显示5个字符宽度%msg：日志消息，%n是换行符-->

                 < pattern >%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n

                 </ pattern >

             </ layout >

         </ encoder >

         <!--日志文件最大的大小-->

         < triggeringPolicy class = "ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy" >

             < MaxFileSize >10MB</ MaxFileSize >

         </ triggeringPolicy >

     </ appender >

     <!-- 日志输出级别 -->

     < root level = "DEBUG" >

         < appender-ref ref = "STDOUT" />

         < appender-ref ref = "TRAIL_LOG" />

     </ root >

</ configuration >

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。

原文链接：https://blog.csdn.net/SonOfWind0311/article/details/86751159

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