http://mvnrepository.com/artifact/org.slf4j/slf4j-api
http://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12
内容如下：
log4j.rootLogger=INFO,stdout,R log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n log4j.appender.R=org.apache.log4j.RollingFileAppender log4j.appender.R.File=spider-job3.log log4j.appender.R.MaxFileSize=500KB log4j.appender.R.MaxBackupIndex=1 log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n
原文：http://www.cnblogs.com/sysout/p/5182565.html