传统的log4j实战

/**
 *
 */
package log4j;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

/**
 * @author think
 *
 */
public class HelloLog4j {
    private static Logger logger = Logger.getLogger(HelloLog4j.class);  

    /**
     * @param args
     */
    public static void main(String[] args) {
        // System.out.println("This is println message.");
        PropertyConfigurator.configure("D:\\workspace\\test\\src\\log4j\\log4j.properties");
        // 记录debug级别的信息
        logger.debug("This is debug message.");
        // 记录info级别的信息
        logger.info("This is info message.");
        // 记录error级别的信息
        logger.error("This is error message.");
    }
}

#可以设置级别：debug>info>error
#debug：显示debug、info、error
#info：显示info、error
#error：只error
log4j.rootLogger=debug,appender1
#log4j.rootLogger=info,appender1
#log4j.rootLogger=error,appender1  

#输出到控制台
log4j.appender.appender1=org.apache.log4j.ConsoleAppender
#样式为TTCCLayout
log4j.appender.appender1.layout=org.apache.log4j.PatternLayout

log4j.appender.appender1.layout.ConversionPattern=%r [%t] [%p] - %c -%l -%m -%d%n 

参考文档如下：

http://www.iteye.com/topic/378077