Java log4j 示例配置文件（属性文件）
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log4j sample configuration file (properties file)
提问by flybywire
What is the easiest way to get started with log4j configuration?
开始使用 log4j 配置的最简单方法是什么？
采纳答案by flybywire
Put a file named log4j.propertiesin the root of your classpath:
将一个名为的文件放在log4j.properties类路径的根目录中：
log4j.rootLogger = ALL, Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.conversionPattern=%m%n
Nothing else is needed. Log4j will discover it and configure itself.
不需要其他任何东西。Log4j 会发现它并自行配置。
回答by Brian Agnew
回答by Andreas Dolk
The absolute easiest way is to visit the log4j pages at apache and read the short introduction. They have a sample log4j.configuration ready to be copied and pasted.
最简单的方法是访问 apache 的 log4j 页面并阅读简短的介绍。他们有一个示例 log4j.configuration 可以复制和粘贴。
回答by ThinkBonobo
In case you stumble into this and are looking for a sample file for log4j2. The way I got it to work was to create a file names log4j2.xml in the base 'resources' directory (I'm using maven so that was 'src/main/resources')
如果您偶然发现并正在寻找 log4j2 的示例文件。我让它工作的方式是在基本'resources'目录中创建一个文件名log4j2.xml（我使用maven所以它是'src/main/resources'）
Then copy the sample configuration from the manual: http://logging.apache.org/log4j/2.x/manual/configuration.html
然后从手册中复制示例配置：http: //logging.apache.org/log4j/2.x/manual/configuration.html
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="error">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
This will give you a nice simple console logger. I recommend you modify the pattern to how you want it to look and the 'Root level=' to something more inclusive. And of course, read the manual for more powerful settings...
这将为您提供一个不错的简单控制台记录器。我建议您将模式修改为您想要的样子，并将“Root level=”修改为更具包容性的内容。当然，阅读手册以获得更强大的设置......
回答by ilupper
In addition to some other answers, I would add a persistence appender since that's the greatest advantage of using logs over consoles and debuggers; when one can't run through the application code in real-time or the event already occurred.
除了其他一些答案之外，我还会添加一个持久性附加程序，因为这是在控制台和调试器上使用日志的最大优势；当无法实时运行应用程序代码或事件已经发生时。
!/"path"/"filename" will write to root of filesystem. "path"/"filename" will write to path relative to classpath root.
!/"path"/"filename" 将写入文件系统的根目录。“路径”/“文件名”将写入相对于类路径根的路径。
log4j.rootLogger = ALL, Console, default.file
log4j.appender.default.file=org.apache.log4j.FileAppender
log4j.appender.default.file.file={path}/{filename}
log4j.appender.default.file.layout=org.apache.log4j.PatternLayout
log4j.appender.default.file.layout.conversionPattern=%m%n
log4j.appender.Console=org.apache.log4j.ConsoleAppender
...
回答by Rohan C Bandara
# Root logger option
log4j.rootLogger=DEBUG, stdout, file
# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
# Redirect log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
#outputs to Tomcat home
log4j.appender.file.File=${catalina.home}/logs/myapp.log
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
