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618001.html

package log4jTest.com;
 
import java.io.FileReader;
 
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
 
public interface log4jDemo {
    public static void main(String[] args) {
        Logger logger = Logger.getLogger(log4jDemo.class);
         
        //使用默认的配置信息，不需要写log4j.properties
        BasicConfigurator.configure();
        //设置日志输出级别为info，这将覆盖配置文件中设置的级别
        logger.setLevel(Level.INFO);
        //下面的消息将被输出
        logger.info("this is an info");
        logger.warn("this is a warn");
        logger.error("this is an error");
        logger.fatal("this is a fatal");
    }
}

package log4jTest.com;
 
import java.io.FileReader;
 
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.SimpleLayout;
 
public interface log4jDemo {
    public static void main(String[] args) {
        Logger logger = Logger.getLogger(log4jDemo.class);
         
        SimpleLayout layout=new SimpleLayout();
        FileAppender appender=null;
         
        try
        {
            //把输出端配置到F:/logs/log.log
            appender = new FileAppender(layout,"F:/logs/log.log",false);
        }catch(Exception e){   
            e.printStackTrace();
        }
        logger.addAppender(appender);//添加输出端
        logger.setLevel((Level)Level.DEBUG);//覆盖配置文件中的级别
 
        logger.info("this is an info");
        logger.warn("this is a warn");
        logger.error("this is an error");
        logger.fatal("this is a fatal");
    }
}