如何格式化ruby logger？

你如何格式化ruby记录器？

Answer 1

 logger = Logger.new('nice.log') logger.formatter = proc do |severity, datetime, progname, msg| "NICE: #{msg}\n" end logger.info("I like cheese.") # nice.log: NICE: I like cheese. 

Answer 2

如果只想格式化时间，可以使用datetime_format和标准格式规范轻松完成。 例如，如果你这样做：

 # Set the logger: logger = Logger.new($stdout) logger.level = Logger::DEBUG logger.datetime_format = "%Y-%m-%d %H:%M:%S" logger.info("This is an info log...") logger.error("This is an error log...") 

您最终会得到以下日志：

 I, [2015-01-20 14:02:29#17329] INFO -- myProg: This is an info log... E, [2015-01-20 14:02:29#17329] ERROR -- myProg: This is an error log... 

相反，如果要完全自定义日志，可以使用logger.formatter 。 例如，如果你这样做：

 # Set the logger: logger = Logger.new($stdout) logger.level = Logger::DEBUG logger.formatter = proc do |severity, datetime, progname, msg| date_format = datetime.strftime("%Y-%m-%d %H:%M:%S") if severity == "INFO" or severity == "WARN" "[#{date_format}] #{severity} (#{progname}): #{msg}\n" else "[#{date_format}] #{severity} (#{progname}): #{msg}\n" end end logger.info("This is an info log...") logger.error("This is an error log...") 

您最终会得到以下日志：

 [2015-01-20 14:48:04] INFO (myProg): This is an info log... [2015-01-20 14:48:04] ERROR (myProg): This is an error log...