> For the complete documentation index, see [llms.txt](https://jack80342.gitbook.io/spring-boot/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jack80342.gitbook.io/spring-boot/iv.-spring-boot-features/26.-logging.md).

# 26. 日志

Spring Boot内部日志系统使用的是[Commons Logging](http://commons.apache.org/logging)，但开放底层的日志实现，默认为会[Java Util Logging](http://docs.oracle.com/javase/7/docs/api/java/util/logging/package-summary.html), [Log4J](http://logging.apache.org/log4j/), [Log4J2](http://logging.apache.org/log4j/2.x/)和[Logback](http://logback.qos.ch/)提供配置。每种情况下都预先配置使用控制台输出，也可以使用可选的文件输出。

默认情况下，如果你使用“Starters”，那么就会使用Logback记录日志。为了确保使用Java Util Logging, Commons Logging, Log4J或SLF4J的依赖库能够正常工作，相应的Logback路由也会包含进来。

**注** 如果上面的列表看起来令人困惑，不要担心，Java有很多可用的日志框架。通常，你不需要改变日志依赖，Spring Boot默认的就能很好的工作。


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