eclipse运行程序时候出现下面错误：
log4j:WARN No appenders could be found for logger (org.apache.ibatis.logging.LogFactory).
log4j:WARN Please initialize the log4j system properly.
解决办法：
log4j.properties文件需要放到src目录下面。
log4j.rootLogger=debug, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern=%5p - %m%n
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=log4j.log
log4j.appender.R.MaxFileSize=100KB
log4j.appender.R.MaxBackupIndex=1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
#log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
log4j.appender.R.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.logger.com.codefutures=DEBUG
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