Java 日志文件的 log4j 路径
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log4j path for logs file
提问by Wojtek
I am using log4j for my logs. My application has a simple XML configuration file and I need to have in my config file the path for the log file. At the moment, it's another XML configuration file for log4j that contains this:
我正在为我的日志使用 log4j。我的应用程序有一个简单的 XML 配置文件,我需要在我的配置文件中有日志文件的路径。目前,它是 log4j 的另一个 XML 配置文件,其中包含以下内容:
<log4j:configuration>
<appender name="file" class="org.apache.log4j.FileAppender">
<errorHandler class="org.apache.log4j.helpers.OnlyOnceErrorHandler" />
<param name="file" value="log.out" />
(..........)
(log.out
is the default log which is in the project's directory.) How can I move this configuration into my application's configuration file?
(log.out
是项目目录中的默认日志。)如何将此配置移动到应用程序的配置文件中?
回答by Aaron Digulla
There are basically three options:
基本上有三种选择:
During the build, create a config for log4j which contains an absolute path for the file parameter. Least flexible.
Use a System property. While this gives you some flexibility, this causes problems when you run in a container (J2EE server) and you have several applications which all use log4j.
在构建期间,为 log4j 创建一个配置,其中包含文件参数的绝对路径。最不灵活。
使用系统属性。虽然这为您提供了一些灵活性,但是当您在容器(J2EE 服务器)中运行并且您有几个都使用 log4j 的应用程序时,这会导致问题。
The second option comes in two flavors:
第二种选择有两种风格:
You can specify the path for the log file using
${logFile}
in the XML and use-DlogFile=
on the command line to specify the path.You can keep the XML config in a different place and tell log4j to load it when it starts using
-Dlog4j.configuration=/absolute/path/to/log4j.xml
您可以
${logFile}
在 XML 中指定日志文件的路径,并-DlogFile=
在命令行中使用来指定路径。您可以将 XML 配置保留在不同的位置,并告诉 log4j 在开始使用时加载它
-Dlog4j.configuration=/absolute/path/to/log4j.xml
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