java_log4j多文件配置

今天配置了log4j中写多个文件的内容，配置了半天才搞出来，为了避免类似问题，写个博客吧。

首先说一下需求，每天要在7个文件夹中生成文件，文件格式为xxx.log.2000.01.01，自己开发个写文件工具也不是不可以，但是一想log4j有现成的功能，何乐而不为呢，思想胜于一切。所以需要一个logger对应一个文件，开始配置，我定义了7个rootLogger，分别是

charge_log, gold_log, prop_log, register_log, active_log, game_play_log, online_log 

</pre><pre name="code" class="plain">timer_log是错误日志记录。 

log4j.rootLogger=INFO,stdout, timer_log, charge_log, gold_log, prop_log, register_log, active_log, game_play_log, online_log

log4j.appender.stdout = org.apache.log4j.ConsoleAppender   
log4j.appender.stdout.Target = System.out   
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout   
log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} %5p %c{1}:%L - %m%n

log4j.appender.timer_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.timer_log.Append=true
log4j.appender.timer_log.DatePattern='.'yyyy-MM-dd
log4j.appender.timer_log.File=../logs/timer/timer.log
log4j.appender.timer_log.Threshold=INFO
log4j.appender.timer_log.layout=org.apache.log4j.PatternLayout
log4j.appender.timer_log.layout.ConversionPattern=%d - %c [%t] %-5p %c %x %l - %m%n

log4j.logger.charge_log=INFO, charge_log
log4j.appender.charge_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.charge_log.Append=true
log4j.appender.charge_log.DatePattern='.'yyyy-MM-dd
log4j.appender.charge_log.File=../logs/charge_log/charge.log
log4j.appender.charge_log.Threshold=INFO
log4j.appender.charge_log.layout=org.apache.log4j.PatternLayout
log4j.appender.charge_log.layout.ConversionPattern=%m%n
log4j.additivity.charge_log=false

log4j.logger.gold_log=INFO, gold_log
log4j.appender.gold_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.gold_log.Append=true
log4j.appender.gold_log.DatePattern='.'yyyy-MM-dd
log4j.appender.gold_log.File=../logs/gold_log/gold_log.log
log4j.appender.gold_log.Threshold=INFO
log4j.appender.gold_log.layout=org.apache.log4j.PatternLayout
log4j.appender.gold_log.layout.ConversionPattern=%m%n
log4j.additivity.gold_log=false

log4j.logger.prop_log=INFO, prop_log
log4j.appender.prop_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.prop_log.Append=true
log4j.appender.prop_log.DatePattern='.'yyyy-MM-dd
log4j.appender.prop_log.File=../logs/prop_log/prop_log.log
log4j.appender.prop_log.Threshold=INFO
log4j.appender.prop_log.layout=org.apache.log4j.PatternLayout
log4j.appender.prop_log.layout.ConversionPattern=%m%n
log4j.additivity.prop_log=false

log4j.logger.register_log=INFO, register_log
log4j.appender.register_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.register_log.Append=true
log4j.appender.register_log.DatePattern='.'yyyy-MM-dd
log4j.appender.register_log.File=../logs/register_log/register_log.log
log4j.appender.register_log.Threshold=INFO
log4j.appender.register_log.layout=org.apache.log4j.PatternLayout
log4j.appender.register_log.layout.ConversionPattern=%m%n
log4j.additivity.register_log=false

log4j.logger.active_log=INFO, active_log
log4j.appender.active_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.active_log.Append=true
log4j.appender.active_log.DatePattern='.'yyyy-MM-dd
log4j.appender.active_log.File=../logs/active_log/active_log.log
log4j.appender.active_log.Threshold=INFO
log4j.appender.active_log.layout=org.apache.log4j.PatternLayout
log4j.appender.active_log.layout.ConversionPattern=%m%n
log4j.additivity.active_log=false

log4j.logger.game_play_log=INFO, game_play_log
log4j.appender.game_play_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.game_play_log.Append=true
log4j.appender.game_play_log.DatePattern='.'yyyy-MM-dd
log4j.appender.game_play_log.File=../logs/game_play_log/game_play_log.log
log4j.appender.game_play_log.Threshold=INFO
log4j.appender.game_play_log.layout=org.apache.log4j.PatternLayout
log4j.appender.game_play_log.layout.ConversionPattern=%m%n
log4j.additivity.game_play_log=false

log4j.logger.online_log=INFO, online_log
log4j.appender.online_log=org.apache.log4j.DailyRollingFileAppender
log4j.appender.online_log.Append=true
log4j.appender.online_log.DatePattern='.'yyyy-MM-dd
log4j.appender.online_log.File=../logs/online_log/online_log.log
log4j.appender.online_log.Threshold=INFO
log4j.appender.online_log.layout=org.apache.log4j.PatternLayout
log4j.appender.online_log.layout.ConversionPattern=%m%n
log4j.additivity.online_log=false

配置文件中有几个关键点：

1.log4j.logger.online_log=INF

<pre name="code" class="java">import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TestObservable {
    
    Logger chargeLogger = LoggerFactory.getLogger("charge_log");
    Logger goldLogger = LoggerFactory.getLogger("gold_log");
    Logger propLogger = LoggerFactory.getLogger("prop_log");
    Logger registerLogger = LoggerFactory.getLogger("register_log");
    Logger activeLogger = LoggerFactory.getLogger("active_log");
    Logger gamePlayLogger = LoggerFactory.getLogger("game_play_log");
    Logger onlineLogger = LoggerFactory.getLogger("online_log");
    
    
    public void setSource(List<?> objectList,LoggerType loggerType) throws Exception {

        if(objectList == null || objectList.isEmpty()) {
            return;
        }
        
        for(Object obj : objectList) {

            switch(loggerType) {
            case CHARGE_LOG :
                chargeLogger.info(obj.toString());
                break;
            case ACTIVE_ACCOUNT :
                activeLogger.info(obj.toString());
                break;
            case GAME_PLAY :
                gamePlayLogger.info(obj.toString());
                break;
            case GOLD_LOG :
                goldLogger.info(obj.toString());
                break;
            case ONLINE_PLAYER :
                onlineLogger.info(obj.toString());
                break;
            case PROP_LOG :
                propLogger.info(obj.toString());
                break;
            case REGISTER_LOG :
                registerLogger.info(obj.toString());
                break;
            default :
                throw new Exception("Type not suitable.");
            }
        }
    }

    public void setSource(Object obj,LoggerType loggerType) throws Exception {

        if(obj == null) {
            return;
        }

        switch(loggerType) {
        case CHARGE_LOG :
            chargeLogger.info(obj.toString());
            break;
        case ACTIVE_ACCOUNT :
            activeLogger.info(obj.toString());
            break;
        case GAME_PLAY :
            gamePlayLogger.info(obj.toString());
            break;
        case GOLD_LOG :
            goldLogger.info(obj.toString());
            break;
        case ONLINE_PLAYER :
            onlineLogger.info(obj.toString());
            break;
        case PROP_LOG :
            propLogger.info(obj.toString());
            break;
        case REGISTER_LOG :
            registerLogger.info(obj.toString());
            break;
        default :
            throw new Exception("Type not suitable.");
        }
    }
    
    public static void main(String[] args) {
        TestObservable  abservable = new TestObservable();
try {
abservable.setSource("gole_log", LoggerType.GOLD_LOG);
abservable.setSource("charge_log", LoggerType.CHARGE_LOG);
abservable.setSource("active_log", LoggerType.ACTIVE_ACCOUNT);
abservable.setSource("game_play_log", LoggerType.GAME_PLAY);
abservable.setSource("online_player", LoggerType.ONLINE_PLAYER);
abservable.setSource("prop_log", LoggerType.PROP_LOG);
abservable.setSource("register_log", LoggerType.REGISTER_LOG);} 
catch (Exception e) {
  e.printStackTrace();}}} 
}

}

O, online_log

2.log4j.additivity.online_log=false

additivity的含义是 子Logger 是否继承 父Logger 的 输出源（appender） 的标志位。具体说，默认情况下 子Logger 会继承 父Logger 的appender，也就是说 子Logger 会在 父Logger 的appender里输出。若是additivity设为false，则 子Logger 只会在自己的appender里输出，而不会在 父Logger 的appender里输出。

ConversionPattern=%m%n 是我只输出我的内容加个换行。