Spring boot 官网学习笔记 - logging

1. 调整日志级别
   1. Log Level: ERROR, WARN, INFO, DEBUG, or TRACE.
   2. Logback does not have a FATAL level. It is mapped to ERROR.
   3. The default log configuration echoes messages to the console as they are written. By default, ERROR-level, WARN-level, and INFO-level messages are logged. You can also enable a “debug” mode by starting your application with a --debug flag.

   4. $ java -jar myapp.jar --debug

   5. Alternatively, you can enable a “trace” mode by starting your application with a --trace flag (or trace=true in your application.properties).
2. 日志文件
   1. By default, Spring Boot logs only to the console and does not write log files. If you want to write log files in addition to the console output, you need to set a logging.file or logging.path property (for example, in your application.properties).
   2. Log files rotate when they reach 10 MB and, as with console output, ERROR-level, WARN-level, and INFO-level messages are logged by default. Size limits can be changed using the logging.file.max-size property. Previously rotated files are archived indefinitely unless the logging.file.max-history property has been set.
   3. Logging properties are independent of the actual logging infrastructure. As a result, specific configuration keys (such as logback.configurationFile for Logback) are not managed by spring Boot.
   4.