java 如何在 Log4j 中使用 SizeBasedTriggeringPolicy 和 TimeBasedRollingPolicy？
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How to use SizeBasedTriggeringPolicy with TimeBasedRollingPolicy in Log4j?
提问by Samurai
Hi I am using Log4j for logging. Below is my configuration.
嗨，我正在使用 Log4j 进行日志记录。下面是我的配置。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true"
xmlns:log4j='http://jakarta.apache.org/log4j/'>
<appender name="FileAppender_Comp3" class="org.apache.log4j.rolling.RollingFileAppender">
<rollingPolicy name="file" class="org.apache.log4j.rolling.TimeBasedRollingPolicy">
<param name="FileNamePattern" value="log/Comp3_%d{dd-MM-yyyy HH-mm-ss}.log" />
</rollingPolicy>
<triggeringPolicy class="org.apache.log4j.rolling.SizeBasedTriggeringPolicy">
<param name="MaxFileSize" value="3kb"/>
</triggeringPolicy>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %5p [%t] %c (%F:%L) - %m%n"/>
</layout>
</appender>
But when I am running file it is throwing below error.
但是当我运行文件时，它会抛出以下错误。
log4j:WARN Failed to set property [maxFileSize] to value "3kb".
How can I fix this. Please help me.
我怎样才能解决这个问题。请帮我。
回答by krishnakumarp
If you are using Log4j 2, you can specify the size in KB or MB.
如果您使用的是Log4j 2，则可以以 KB 或 MB 为单位指定大小。
Relevant XML below.
下面的相关 XML。
<Policies>
<!-- Starts a new log on tomcat start -->
<OnStartupTriggeringPolicy />
<!-- Starts a new file when size reaches threshold -->
<SizeBasedTriggeringPolicy size="10 MB" />
<!-- causes a rollover once the date/time pattern no longer
applies to the active file -->
<TimeBasedTriggeringPolicy />
</Policies
Please see https://logging.apache.org/log4j/2.x/manual/appenders.htmlfor more details.
有关更多详细信息，请参阅https://logging.apache.org/log4j/2.x/manual/appenders.html。
回答by KumN
As per documentation, it has to be long value for MaxFileSize. Please check at https://logging.apache.org/log4j/extras/apidocs/org/apache/log4j/rolling/SizeBasedTriggeringPolicy.html
根据文档，MaxFileSize 必须是长值。请查看https://logging.apache.org/log4j/extras/apidocs/org/apache/log4j/rolling/SizeBasedTriggeringPolicy.html
So, the value should be 3072 instead of 3kb in this case.
因此，在这种情况下，该值应为 3072 而不是 3kb。
回答by Gabriel Ruiu
just happened to come across this question and thought I should share the solution:
碰巧遇到这个问题，并认为我应该分享解决方案：
set the MaxFileSize param to a value in bytes, so for your example you would set it as
将 MaxFileSize 参数设置为以字节为单位的值，因此对于您的示例，您可以将其设置为
<param name="MaxFileSize" value="3072"/>
Hereis a similar question where this solution is confirmed.
这是一个类似的问题，其中确认了此解决方案。
