我知道了，是因?yàn)閘og4j的配置問題，按照如下配置就好了

log4j.appender.Cons=org.apache.log4j.ConsoleAppender
log4j.appender.Cons.layout=org.apache.log4j.PatternLayout
log4j.appender.Cons.layout.ConversionPattern=%-4r?[%t]?%-5p?%c?%x?-?%m%n


#?Root?logger?set?to?DEBUG?using?the?A2?appender?defined?above.
log4j.rootLogger=info,?Cons
log4j.additivity=false

#Application?Logger+
log4j.logger.com.imooc.mvcdemo=debug
#log4j.logger.org.springframework=debug,?Cons
log4j.additivity.com=false

同求.......