code: public static void setPropertiesDir(String propertiesDir) {
  		if (propertiesDir == null)
  			propertiesDir = "";
  		propertiesDir = propertiesDir.trim();
  		if (!propertiesDir.endsWith("/"))
  			propertiesDir += "/";
  		ConfigFactory.propertiesDir = propertiesDir;
  		init();
  	}
docs: 设置目录，默认是在classpath根目录
  @param propertiesDir 目录路径
  @since 1.0.3