使用log4j2也遇到了apollo管理日志路径的问题,可以利用log4j2的Property Substitution特性。
http://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution
自定义个StrLookup plugin,查找的时候从apollo中获取。
如果日志路径也需要不重启动态生效，在apollo的监听事件中加上
LoggerContext loggerContext = LoggerContext.getContext(false);
loggerContext.reconfigure();
简单例子https://github.com/hongliang777/log4j2Test.git

@Plugin(name = "lk", category = StrLookup.CATEGORY)
public class LookupFromApp implements StrLookup{
    @Override
    public String lookup(String key) {
        // use apollo
        // return ConfigService.getConfig("app").getProperty(key,"");
        return "d:/abc/logs1/";
    }

    @Override
    public String lookup(LogEvent event, String key) {
        return null;  //To change body of implemented methods use File | Settings | File Templates.
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<Configuration packages="com.yhl.log4j2">
    <Properties>
        <Property name="filename">${lk:abc}.log</Property>
    </Properties>
    ..........

Uh oh!

不用springboot怎么能让log4j2取到apollo的配置？ #1007

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