Java 如何在 Log4j 中根据时间而不是大小来轮换日志文件？
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How to rotate log files based on time rather than size in Log4j?
提问by DivideByHero
I use Log4j with the RollingFileAppenderto create a log rotation based on size.
我使用 Log4j 和RollingFileAppender来创建基于大小的日志轮换。
How can I configure it to log to each file for a certain amount of timebefore rotating?
如何将其配置为在旋转前记录到每个文件一定时间？
For example, so that each log file contains one hour of logs, rotating at the top of each hour?
例如，让每个日志文件包含一小时的日志，在每小时的顶部轮换？
I configure Log4j programatically in Java using a Propertiesobject (as opposed to a log4j.propertiesfile)
我使用Properties对象（而不是log4j.properties文件）在 Java 中以编程方式配置 Log4j
采纳答案by Rob Hruska
You probably want to use a DailyRollingFileAppender. To roll them hourly, for example, you'd use a DatePattern of '.'yyyy-MM-dd-HH. For a log4j.properties file:
您可能想要使用DailyRollingFileAppender。例如，要每小时滚动一次，您可以使用 DatePattern '.'yyyy-MM-dd-HH。对于 log4j.properties 文件：
log4j.appender.myAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.myAppender.DatePattern='.'yyyy-MM-dd-HH
...
Or for your programmatic configuration:
或者对于您的编程配置：
DailyRollingFileAppender appender = new DailyRollingFileAppender();
appender.setDatePattern("'.'yyyy-MM-dd-HH");
Logger root = Logger.getRootLogger();
root.addAppender(appender);
Unfortunately, using a DailyRollingFileAppender means that you can't limit the file size - this could be problematic if you have tons of logs in the given rolled period.
不幸的是，使用 DailyRollingFileAppender 意味着您无法限制文件大小 - 如果您在给定的滚动期内有大量日志，这可能会出现问题。
回答by ChssPly76
Use a DailyRollingFileAppender.
In particular, setting its 'datePattern' property to '.'yyyy-MM-dd-HHwould cause file to rotate every hour.
特别是，将其 'datePattern' 属性设置为'.'yyyy-MM-dd-HH会导致文件每小时轮换一次。
回答by Nathan Feger
The other thing to be careful of with any rolling file appender is to make sure only one JVM access a particular log file at a time. This is because log4j caches the log file size for performance reasons, and your 'rolling' will get wonky if multiple JVMs access the same files.
使用任何滚动文件附加器要注意的另一件事是确保一次只有一个 JVM 访问特定的日志文件。这是因为 log4j 出于性能原因缓存日志文件大小，如果多个 JVM 访问相同的文件，您的“滚动”将变得不稳定。
回答by Tendayi Mawushe
You need to use the DailyRollingFileAppender. Despite its misleading name it can be configured in a to run at configurable time periods up to minutes.
您需要使用DailyRollingFileAppender。尽管它的名称具有误导性，但它可以配置为在最多几分钟的可配置时间段内运行。
回答by pradeekrathnayaka
Additionally,
此外，
log4j.appender.myAppender=org.apache.log4j.DailyRollingFileAppender
**log4j.appender.myAppender.DatePattern='.'yyyy-MM-dd-HH**
The following list shows all the date patterns which have defined by log4j,
以下列表显示了 log4j 定义的所有日期模式，
Minutely '.'yyyy-MM-dd-HH-mm application.log.2013-02-28-13-54
Hourly '.'yyyy-MM-dd-HH application.log.2013-02-28-13
Half-daily '.'yyyy-MM-dd-a application.log.2013-02-28-AM app.log.2013-02-28-PM
Daily '.'yyyy-MM-dd application.log.2013-02-28
Weekly '.'yyyy-ww application.log.2013-07 app.log.2013-08
Monthly '.'yyyy-MM application.log.2013-01 app.log.2013-02
