log4j.xml如何动态进行加载

Question

现在我们有一个服务端的程序，后续的功能需求是要求在程序运行过程中动态更改log4j的日志级别、文件名、文件路径等信
息，原先是DOMConfigurator.configureAndWatch 这个方法加载了log4j配置文件，如果用动态加载应该用log4j中的哪个类来进行设值？
设置完成以后再运行DOMConfigurator.configureAndWatch就可以了吗？

Answer 1

    /**
     * 写运行日志
     * 
     * @param level 日志级别
     * @param message 日志信息
     * @param throwable 异常信息
     */
    public static void runLog(IfRun level, String message, Throwable throwable)
    {
        try
        {
            setMDC(IfRun.LOG_TYPE_RUN);
            switch (level.getLevel())
            {
                case IfRun.DEBUG:                    if (runLog.getRepository().isDisabled(AppLevel.DEBUG_INT))
                    {
                        return;
                    }
                    if (AppLevel.DEBUG.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.DEBUG, message, throwable);
                    }
                    break;
                case IfRun.INFO:
                    if (runLog.getRepository().isDisabled(AppLevel.INFO_INT))
                    {
                        return;
                    }
                    if (AppLevel.INFO.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.INFO, message, throwable);
                    }
                    
                    break;
                case IfRun.NOTICE:
                    if (runLog.getRepository().isDisabled(AppLevel.NOTICE_INT))
                    {
                        return;
                    }
                    if (AppLevel.NOTICE.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.NOTICE, message, throwable);
                    }
                    break;
                case IfRun.WARN:
                    if (runLog.getRepository().isDisabled(AppLevel.WARN_INT))
                    {
                        return;
                    }
                    if (AppLevel.WARNING.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.WARNING, message, throwable);
                    }
                    
                    break;
                case IfRun.ERROR:
                    if (runLog.getRepository().isDisabled(AppLevel.ERROR_INT))
                    {
                        return;
                    }
                    if (AppLevel.ERROR.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.ERROR, message, throwable);
                    }
                    
                    break;
                case IfRun.CRITICAL:
                    if (runLog.getRepository()
                            .isDisabled(AppLevel.CRITICAL_INT))
                    {
                        return;
                    }
                    if (AppLevel.CRITICAL.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.CRITICAL, message, throwable);
                    }
                    break;
                case IfRun.ALERT:
                    if (runLog.getRepository().isDisabled(AppLevel.ALERT_INT))
                    {
                        return;
                    }
                    if (AppLevel.ALERT.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.ALERT, message, throwable);
                    }
                    break;
                case IfRun.EMERGENCY:
                    if (runLog.getRepository()
                            .isDisabled(AppLevel.EMERGENCY_INT))
                    {
                        return;
                    }
                    if (AppLevel.EMERGENCY.isGreaterOrEqual(runLog.getEffectiveLevel()))
                    {
                        runLog.log(FQCN, AppLevel.EMERGENCY, message, throwable);
                    }
                    break;
                default:
                    break;
            }
        }
        finally
        {
            resetMDC();
        }
    }

Answer 2

如果要实现动态写入日志需要自己去写，在程序启动时加载log4j.xml.

Answer 3

对据我所知log4j可在服务启动的时候加载而日志信息的话，可以自己在程序中添加private static Log log = LogFactory.getLog(类名.class);log.info(“”);
log.error("","");
log.debug("");
等

Answer 4

配置log4j.properties如下
log4j.rootLogger=ERROR, common
log4j.logger.cn.sh.cares=ERROR, framework
log4j.logger.ecmr.quality.am=DEBUG, am
log4j.logger.org.hibernate=ERROR,hibernate
log4j.logger.org.springframework=ERROR,springlog4j.appender.common=org.apache.log4j.ConsoleAppender
#log4j.appender.common=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.common.File=am/common.log
log4j.appender.common.layout=org.apache.log4j.PatternLayout
log4j.appender.common.layout.ConversionPattern==%d %-5p [%c] - %m%nlog4j.appender.framework=org.apache.log4j.DailyRollingFileAppender
log4j.appender.framework.File=am/framework.log
log4j.appender.framework.layout=org.apache.log4j.PatternLayout
log4j.appender.framework.layout.ConversionPattern==%d %-5p [%c] - %m%nlog4j.appender.am=org.apache.log4j.DailyRollingFileAppender
log4j.appender.am.File=am/am.log
log4j.appender.am.layout=org.apache.log4j.PatternLayout
log4j.appender.am.layout.ConversionPattern==%d %-5p [%c] - %m%nlog4j.appender.hibernate=org.apache.log4j.DailyRollingFileAppender
log4j.appender.hibernate.File=am/hibernate.log
log4j.appender.hibernate.layout=org.apache.log4j.PatternLayout
log4j.appender.hibernate.layout.ConversionPattern==%d %-5p [%c] - %m%nlog4j.appender.spring=org.apache.log4j.DailyRollingFileAppender
log4j.appender.spring.File=am/spring.log
log4j.appender.spring.layout=org.apache.log4j.PatternLayout
log4j.appender.spring.layout.ConversionPattern==%d %-5p [%c] - %m%n