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Logback是由log4j创始人设计的另一个开源日志组件，本文介绍日志配置文件存放位置，日志配置文件加载过程 |
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参考
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logback的使用和logback.xml详解：来自 <https://blog.csdn.net/lhl1124281072/article/details/79852582>
解决 logback.xml 配置不起作用的问题： 来自 <https://blog.csdn.net/cnwyt/article/details/80462896>
logback： http://logback.qos.ch/manual/configuration.html#auto_configuration
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logback配置加载过程：
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Let us begin by discussing the initialization steps that logback follows to try to configure itself:
- Logback tries to find a file called logback-test.xml in the classpath.
- If no such file is found, logback tries to find a file called logback.groovy in the classpath.
- If no such file is found, it checks for the file logback.xml in the classpath..
- If no such file is found, service-provider loading facility (introduced in JDK 1.6) is used to resolve the implementation of com.qos.logback.classic.spi.Configurator interface by looking up the file META-INF\services\ch.qos.logback.classic.spi.Configurator in the class path. Its contents should specify the fully qualified class name of the desired Configurator implementation.
- If none of the above succeeds, logback configures itself automatically using the BasicConfigurator which will cause logging output to be directed to the console.
The last step is meant as last-ditch effort to provide a default (but very basic) logging functionality in the absence of a configuration file.
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Class path：
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Where should the configuration files such as logback.groovy, logback-test.xml or logback.xml be located on the classpath?
Configuration files such as logback.groovy, logback-test.xml or logback.xml can be located directly under any folder declared in the class path. For example, if the class path reads "c:/java/jdk15/lib/rt.jar;c:/mylibs/" then the logback.xml file should be located directly under "c:/mylibs/", that is as "c:/mylibs/logback.xml". Placing it under a sub-folder of c:/mylibs/, say, c:/mylibs/other/, will not work.
For web-applications, configuration files can be placed directly under WEB-INF/classes/.
总结：logback.xml必须存放在class path所在的目录，其下的子目录不可以
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查看classpath
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查看classpath code接口：
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importch.qos.logback.core.util.StatusPrinter;
importch.qos.logback.classic.LoggerContext;
//打印Logback内部状态
LoggerContextlc=(LoggerContext)LoggerFactory.getILoggerFactory();
StatusPrinter.print(lc);
//获取classpath路径
Strings=Thread.currentThread().getContextClassLoader().getResource("").getPath();
System.out.println("classpath=>"+s);
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1.src\main\resources 目录下没有logback.xml文件,或者配置文件存放在resources子目录下，启动程序，未找到配置文件，logback使用组件默认的日志配置
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14:39:29,493 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
14:39:29,494 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
14:39:29,494 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.xml]
14:39:29,502 |-INFO in ch.qos.logback.classic.BasicConfigurator@77a567e1 - Setting up default configuration.
classpath => */out/production/classes/
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2.把logback .xml文件放置在resource目录下，src\main\resources\logback.xml，找到了 配置文件logback.xml
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14:55:03,053 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
14:55:03,053 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
14:55:03,053 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/D:/*/out/production/resources/logback.xml]
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小结
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- logback组件启动会自动到classpath目录下依次查找logback-test.xml,logback.groovy,logback.xml，查找到就加载，没有查找到加载组件默认的
- 一般日志配置文件放在java项目的resource根目录src\main\resources\logback.xml
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转载自CSDN：https://blog.csdn.net/lanmolei814/article/details/102839755
