SpringBoot启动项目时log4j显示警告信息

深藏阁楼爱情的钟 2023-02-12 10:24 7阅读 0赞

SpringBoot在启动项目时log4j显示如下警告信息

> `log4j:WARN No appenders could be found for logger (druid.sql.Connection).`  
> `log4j:WARN Please initialize the log4j system properly.`  
> `log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.`

log4j显示此信息时因为项目中没有`log4j.properties`文件，需要将此配置文件放入项目的resources目录下。  
`log4j.properties`配置文件示例：

#you cannot specify every priority with different file for log4j
    #log4j.rootLogger=debug,stdout,info,debug,warn,error
    log4j.rootLogger=info,stdout
    
    #console
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender 
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 
    log4j.appender.stdout.layout.ConversionPattern= [%d{ yyyy-MM-dd HH:mm:ss a}]:%p %l%m%n
    
    #info log
    log4j.logger.info=info
    log4j.appender.info=org.apache.log4j.DailyRollingFileAppender 
    log4j.appender.info.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.info.File=../logs/info.log
    log4j.appender.info.Append=true
    log4j.appender.info.Threshold=INFO
    log4j.appender.info.layout=org.apache.log4j.PatternLayout 
    log4j.appender.info.layout.ConversionPattern=%d{ yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    
    #debug log
    log4j.logger.debug=debug
    log4j.appender.debug=org.apache.log4j.DailyRollingFileAppender
    log4j.appender.debug.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.debug.File=../logs/debug.log
    log4j.appender.debug.Append=true
    log4j.appender.debug.Threshold=DEBUG
    log4j.appender.debug.layout=org.apache.log4j.PatternLayout
    log4j.appender.debug.layout.ConversionPattern=%d{ yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    
    #warn log
    log4j.logger.warn=warn
    log4j.appender.warn=org.apache.log4j.DailyRollingFileAppender
    log4j.appender.warn.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.warn.File=../logs/warn.log
    log4j.appender.warn.Append=true
    log4j.appender.warn.Threshold=WARN
    log4j.appender.warn.layout=org.apache.log4j.PatternLayout
    log4j.appender.warn.layout.ConversionPattern=%d{ yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n
    
    #error
    log4j.logger.error=error
    log4j.appender.error = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.error.DatePattern='_'yyyy-MM-dd'.log'
    log4j.appender.error.File = ../logs/error.log
    log4j.appender.error.Append = true
    log4j.appender.error.Threshold = ERROR
    log4j.appender.error.layout = org.apache.log4j.PatternLayout
    log4j.appender.error.layout.ConversionPattern = %d{ yyyy-MM-dd HH:mm:ss a} [Thread: %t][ Class:%c >> Method: %l ]%n%p:%m%n