<configuration>
    <appender name="application" class="ch.qos.logback.core.FileAppender">
        <file>application.log</file>
        <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
            <layout class="ch.qos.logback.classic.PatternLayout">
                <pattern>%d{HH:mm:ss.SSS} - %msg%n</pattern>
                <fileHeader>SomefileHeader</fileHeader>
            </layout>
        </encoder>
    </appender>
    <root level="info">
        <appender-ref ref="application" />
    </root>
</configuration>

public class Main {
    private final static Logger log = LoggerFactory.getLogger(Main.class);
    public static void main(String[] args) throws InterruptedException {
        while (true) {
            log.info("the quick brown fox jumps over the lazy dog");
            Thread.sleep(1000);
        }
    }
}