spring 用的是log4j 日志

myeclipse里面的spring自动加入了log4j 的jar包，如果没有log4j.properties文件的话，会出现警告， log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment). log4j:WARN Please initialize the log4j system properly. log4j:WARN See for more info.

配置好属性文件就可以了 　　log4j.rootLogger=WARN, stdout, R 　　log4j.appender.stdout=org.apache.log4j.ConsoleAppender 　　log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 　　# Pattern to output the caller’s file name and line number. 　　#log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n 　　# Print the date in ISO 8601 format 　　log4j.appender.stdout.layout.ConversionPattern=%d [%t] %-5p %c - %m%n 　　log4j.appender.R=org.apache.log4j.RollingFileAppender 　　log4j.appender.R.File=example.log 　　log4j.appender.R.MaxFileSize=100KB 　　# Keep one backup file 　　log4j.appender.R.MaxBackupIndex=1 　　log4j.appender.R.layout=org.apache.log4j.PatternLayout 　　log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n 　　# Print only messages of level WARN or above in the package com.foo. 　　log4j.logger.com.foo=WARN