docs: public static byte[] objString2Byte(String value, int max, Charset charset) {
          byte[] fullContentBytes = new byte[max];
          // 填充默认值
          Arrays.fill(fullContentBytes, (byte) 0);
          if (null == value) {
              return fullContentBytes;
          }
          // 获取byte
          byte[] realContent = value.getBytes(charset);
          int length;
          if (realContent.length <= max) {
              length = realContent.length;
          } else {
              length = max;
          }
          // 复制数值
          System.arraycopy(realContent, 0, fullContentBytes, 0, length);
          return fullContentBytes;
      }