java利用log4j将一个类中不同业务日志记录到不同位置

下文代码中，除了指定rootlogger输出到控制台和文件logdemo.log中之外，还定义了一个指定目的的子logger，令其日志输出到logdemo2.log文件中，同时它不继承rootlogger的输出特性。
来源：http://blog.csdn.net/dongzi87/article/details/8292865

#category/logger
log4j.rootLogger=debug, stdout, file
log4j.logger.SpecialPurpose=debug,file2
#Succession
log4j.additivity.SpecialPurpose=false
#to console
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} %p %c %m %n
#to file#
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=logdemo.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %l %m%n
#to file2
log4j.appender.file2=org.apache.log4j.FileAppender
log4j.appender.file2.File=logdemo2.log
log4j.appender.file2.layout=org.apache.log4j.PatternLayout
log4j.appender.file2.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %l %m%n

java代码

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Logger;
public class Log4jTest {
	
	private static Logger logger =Logger.getLogger(Log4jTest.class);
	private static Log logger2 = LogFactory.getLog("SpecialPurpose");
	
	public static void main(String[] args) {
		
			logger.error("error");
			logger.warn("warn");
			logger.info("info");
			logger.debug("debug");
			
			logger2.error("error for SpecialPurpose...");
			logger2.warn("warn for SpecialPurpose...");
			logger2.info("info for SpecialPurpose...");
			logger2.debug("debug for SpecialPurpose...");
	}
}
logdemo.log和控制台文件信息：
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:13) error
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:14) warn
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:15) info
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:16) debug
logdemo2.log文件信息：
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:18) error for SpecialPurpose...
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:19) warn for SpecialPurpose...
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:20) info for SpecialPurpose...
2012-12-13 22:06:23 Log4jTest.main(Log4jTest.java:21) debug for SpecialPurpose...