code: public JULQueryCountLoggingServletFilter buildJULFilter(Level logLevel) {
          if (logLevel != null) {
              this.julLogLevel = logLevel;
          }
  
          JULQueryCountLoggingServletFilter filter = new JULQueryCountLoggingServletFilter();
          if (this.julLogLevel != null) {
              filter.setLogLevel(this.julLogLevel);
          }
          filter.setWriteAsJson(this.writeAsJson);
          return filter;
      }
docs: Build {@link net.ttddyy.dsproxy.support.JULQueryCountLoggingServletFilter}.
  
  @param logLevel commons log level
  @return query-count-logger using Java Util Logging
  @since 1.4.2