log4j:WARN No appenders could be found for logger（logger.info 不能输出）

log4j:WARN No appenders could be found for logger (com.xz.app.controller.PayController).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

意思是没有logger的输出源

就是你缺少了log4.properties的文件  这个文件是来说明输出源的

log4j.rootLogger =stdout,E
/error.log ###
log4j.appender.E.File=/logs/log.log
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.Append = true
log4j.appender.E.Threshold = INFO
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

stdout是输出到控制台，E是输出到指定文件。