code: private static String toAscii(BitMatrix bitMatrix) {
          StringBuilder sb = new StringBuilder();
          for (int rows = 0; rows < bitMatrix.getHeight(); rows++) {
              for (int cols = 0; cols < bitMatrix.getWidth(); cols++) {
                  boolean x = bitMatrix.get(rows, cols);
                  if (!x) {
                      // white
                      sb.append("\033[47m  \033[0m");
                  } else {
                      sb.append("\033[30m  \033[0;39m");
                  }
              }
              sb.append("\n");
          }
          return sb.toString();
      }
docs: 将二维码输出为 ASCII
  
  @param bitMatrix
  @return