在eclipse 工程的src下新建log4j.properties 文件，在其中加入
log4j.rootLogger=debug,appender1
log4j.appender.appender1=org.apache.log4j.FileAppender
log4j.appender.appender1.File=C:/log.log
log4j.appender.appender1.layout=org.apache.log4j.PatternLayout
log4j.appender.appender1.layout.ConversionPattern=[%d{yyyy-MM-dd HH:mm:ss:SSS}][%C-%M] %m%n
新建测试类
package cn.netcenter.logger;
import org.apache.log4j.Logger;
public class LogTest {
private static Logger logger=Logger.getLogger(LogTest.class);
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
logger.debug("this is debug message");
logger.info("this is info meesage");
logger.error("this is error message");
}
}