【发布时间】：2020-09-16 08:03:04
【问题描述】：
我正在尝试将 TimeBasedTriggeringPolicy 与嵌入 spring-boot 2.3.0.RELEASE (spring-boot-started-log4j2) 的 log4j-2.13.2 一起使用。 预期的功能是应该为每天创建一个日志文件。
我的配置文件如下所示：
appender.rolling.type = RollingFile
appender.rolling.name = fileAppender
appender.rolling.fileName = ${basePath}/log-${date:yyyyMMdd}.log
appender.rolling.filePattern = ${basePath}/log-${date:yyyyMMdd}-%i.log
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = [%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %msg%n
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
但是，在启动应用程序时，会抛出以下异常：
2020-05-28 23:39:07,991 main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.RollingFileAppender for element RollingFile: java.lang.IllegalStateException: Pattern does not contain a date java.lang.IllegalStateException: Pattern does not contain a date
at org.apache.logging.log4j.core.appender.rolling.PatternProcessor.getNextTime(PatternProcessor.java:154)
at org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy.initialize(TimeBasedTriggeringPolicy.java:117)
at org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy.initialize(CompositeTriggeringPolicy.java:54)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.initialize(RollingFileManager.java:158)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:153)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:62)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:122)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1002)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:942)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:934)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:552)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:241)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:288)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:618)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:295)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:240)
at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:159)
at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:131)
at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:101)
at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:188)
如果我更改文件模式：
appender.rolling.fileName = ${basePath}/log-%d{yyyyMMdd}.log
appender.rolling.filePattern = ${basePath}/log-%d{yyyyMMdd}-%i.log
不再抛出异常，但文件名是“log-%d{yyyyMMdd}.log”而不是“log-20200528.log”（例如）。
我应该如何指定 filePattern 属性以实现预期的行为（为每天生成一个日志文件，当前日期包含在文件名中）？
【问题讨论】：
标签： spring-boot log4j2