如何在Log4j中根据时间而不是大小来旋转日志文件？ [英] How to rotate log files based on time rather than size in Log4j?

问题描述

我使用Log4j和 RollingFileAppender 根据大小创建日志轮换。

I use Log4j with the RollingFileAppender to create a log rotation based on size.

我如何配置它在旋转之前记录每个文件一定量的时间？

How can I configure it to log to each file for a certain amount of time before rotating?

例如，这样每个日志文件包含一小时的日志，在每小时的顶部旋转？

For example, so that each log file contains one hour of logs, rotating at the top of each hour?

我使用属性对象以编程方式在Java中配置Log4j（而不是 log4j .properties file）

I configure Log4j programatically in Java using a Properties object (as opposed to a log4j.properties file)

推荐答案

您可能想要使用 DailyRollingFileAppender 。例如，要按小时滚动它们，您将使用'的DatePattern。'yyyy-MM-dd-HH 。对于log4j.properties文件：

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:

log4j.appender.myAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.myAppender.DatePattern='.'yyyy-MM-dd-HH
...

或者对于您的程序化配置：

Or for your programmatic configuration:

DailyRollingFileAppender appender = new DailyRollingFileAppender();
appender.setDatePattern("'.'yyyy-MM-dd-HH");

Logger root = Logger.getRootLogger();
root.addAppender(appender);

不幸的是，使用DailyRollingFileAppender意味着你无法限制文件大小 - 如果这样做可能会有问题在给定的滚动期内你有大量的日志。

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.

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