public class Slf4j {
	private static final Logger logger = LoggerFactory
			.getLogger(Slf4j.class);

	public static void main(String[] args) {
		String log4j = Slf4j.class.getClassLoader().getResource("log4j.properties").getPath();
		PropertyConfigurator.configure(log4j);//載入.properties檔案
		logger.error("This is error message.");
		logger.info("Hello {}", "SLF4J");
	}
}