Implementation method of Log4j outputting logs to different files by level

As shown below:

log4j.rootLogger=info,stdout,info,debug,warn,error  
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} [ %t:%r ] - [ %p ] %m%n  
    
log4j.logger.info=info  
log4j.appender.info=org.apache.log4j.DailyRollingFileAppender  
log4j.appender.info.layout=org.apache.log4j.PatternLayout  
log4j.appender.info.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n  
log4j.appender.info.datePattern='.'yyyy-MM-dd  
log4j.appender.logfile.MaxFileSize=5120KB  
log4j.appender.logfile.MaxBackupIndex=3 
log4j.appender.info.Threshold=INFO  
log4j.appender.info.append=true 
log4j.appender.info.File=/usr/local/tomcat7/logs/info.log  
    
log4j.logger.debug=debug  
log4j.appender.debug=org.apache.log4j.DailyRollingFileAppender  
log4j.appender.debug.layout=org.apache.log4j.PatternLayout  
log4j.appender.debug.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n  
log4j.appender.debug.datePattern='.'yyyy-MM-dd  
log4j.appender.logfile.MaxFileSize=5120KB  
log4j.appender.logfile.MaxBackupIndex=3 
log4j.appender.debug.Threshold=DEBUG  
log4j.appender.debug.append=true 
log4j.appender.debug.File=/usr/local/tomcat7/logs/debug.log  
    
log4j.logger.warn=warn    
log4j.appender.warn=org.apache.log4j.DailyRollingFileAppender  
log4j.appender.warn.layout=org.apache.log4j.PatternLayout  
log4j.appender.warn.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n  
log4j.appender.warn.datePattern='.'yyyy-MM-dd  
log4j.appender.logfile.MaxFileSize=5120KB  
log4j.appender.logfile.MaxBackupIndex=3   
log4j.appender.warn.Threshold=WARN    
log4j.appender.warn.append=true   
log4j.appender.warn.File=/usr/local/tomcat7/logs/warn.log  
    
log4j.logger.error=error    
log4j.appender.error=org.apache.log4j.DailyRollingFileAppender    
log4j.appender.error.layout=org.apache.log4j.PatternLayout    
log4j.appender.error.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n  
log4j.appender.error.datePattern='.'yyyy-MM-dd  
log4j.appender.logfile.MaxFileSize=5120KB  
log4j.appender.logfile.MaxBackupIndex=3 
log4j.appender.error.Threshold=ERROR    
log4j.appender.error.append=true   
log4j.appender.error.File=/usr/local/tomcat7/logs/error.log

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