log4jhelloword

/**************************************************/
/*                   HelloWorld                   */
/**************************************************/
1：把log4j-1.2.8.jar添加到CLASSPATH环境变量

2：编写java代码
    import org.apache.log4j.Logger;
    import org.apache.log4j.BasicConfigurator;
   
    public class HelloWorld
    {
        static Logger logger = Logger.getLogger("HelloWorld");
       
        static public void main(String[] args)
        {
            BasicConfigurator.configure();
            logger.debug("Hello World.");
        }
    }

3：编译执行


/**************************************************/
/*             HelloWorldConfiguration            */
/**************************************************/
1：把log4j-1.2.8.jar添加到CLASSPATH环境变量

2：编写java代码
    import org.apache.log4j.Logger;
    import org.apache.log4j.PropertyConfigurator;
   
    public class HelloWorldConfiguration
    {
        static Logger logger = Logger.getLogger("HelloWorldConfiguration");
       
        static public void main(String[] args)
        {
            PropertyConfigurator.configure("log4j.properties");
            logger.debug("Hello World.");
        }
    }

3：编写配置文件
    # 根logger有一个appender:logfile
    log4j.rootLogger=ALL, logfile
   
    log4j.appender.logfile=org.apache.log4j.RollingFileAppender
    log4j.appender.logfile.File=helloworldconfiguration.log
    log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
    log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

4：编译执行，会生成helloworldconfiguration.log文件