?? log4j.properties
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### global config ###
# log level: DEBUG<INFO<WARN<ERROR<FATAL
log4j.rootLogger=WARN, console
### appender of console ###
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%-5p %5r %c] -> %m%n
### appender of file ###
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=/exam.log
log4j.appender.file.MaxFileSize=100KB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%-5p %5r %d{yyyy-MM-dd HH:mm:ss.SSS} %c] -> %m%n?? 快捷鍵說明
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