How to add the date timestamp to log4j2 logfiles?

Question

I want to create day dependent logfiles with log4j2:

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Answer 1

Use ASizeBasedTriggeringPolicy class in appender. You can even append the current second to the logfile name. %d{yyyy_MM_dd HH.mm.ss}

import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.rolling.*;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;

@Plugin(name = "ASizeBasedTriggeringPolicy",
        category = "Core",
        printObject = true
)
public class ASizeBasedTriggeringPolicy extends AbstractTriggeringPolicy {
    private SizeBasedTriggeringPolicy sizeBasedTriggeringPolicy;
    private RollingFileManager aManager;

    protected ASizeBasedTriggeringPolicy(String maxFileSize) {
        sizeBasedTriggeringPolicy = SizeBasedTriggeringPolicy.createPolicy(maxFileSize);

    }

    public void initialize(RollingFileManager aManager) {
        sizeBasedTriggeringPolicy.initialize(aManager);
        this.aManager = aManager;
    }

    public boolean isTriggeringEvent(LogEvent event) {
        if (sizeBasedTriggeringPolicy.isTriggeringEvent(event)) {
            aManager.getPatternProcessor().setPrevFileTime(System.currentTimeMillis());
            return true;
        } else {
            return false;
        }
    }

    @PluginFactory
    public static ASizeBasedTriggeringPolicy createPolicy(@PluginAttribute("size") String size) {
        return new ASizeBasedTriggeringPolicy(size);
    }
}

Then use ASizeBasedTriggeringPolicy in log appender

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