code: public static Color randomColor(Random random) {
  		if (null == random) {
  			random = RandomUtil.getRandom();
  		}
  		return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));
  	}
docs: 生成随机颜色
  
  @param random 随机对象 {@link Random}
  @return 随机颜色
  @since 3.1.2