eclipse 警告log4j:WARN No appenders could be found for logger log4j:WARN Please initialize the log4j system properly.
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解决办法：方法一、将jar包中的log4j.properties复制到项目src文件夹或将log4j.properties放到 /WEB-INF/classes文件夹中即可
方法二、在工程src下面新建文件log4j.properties。内容如下：
# Configure logging for testing: optionally with log file
log4j.rootLogger=WARN, stdout
# log4j.rootLogger=WARN, stdout, logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/spring.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
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