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相信大家都使用过草料二维码生成器，单独生成二维码可以，但是批量生成二维码就需要收费了。既然要收费，那就自己写一个。

接口采用导入Excel文件生成二维码，首先需要读取Excel的数据，方法如下所示：

/// <summary>
/// 读取数据
/// </summary>
/// <returns>Workbook</returns>
public static DataTable GetExcel(string Path, ref string exceptionMsg)
{//定义datatableDataTable dtExcel = new DataTable();//思路：//1、获取读取的文件；2、把文件转换为二进制数组；3、二进制数组转成内存流；4、利用NPOI把内存流中的数据读取成ExcelFileStream fs = new FileStream(Path, FileMode.Open, FileAccess.Read);//声明二进制数组存放文件byte[] fileBytes = new byte[fs.Length];//将传入的文件转化为二进制的数组存入fileBytesfs.Read(fileBytes, 0, (int)fs.Length);//将二进制的数组转化为内存流MemoryStream excelFileStream = new MemoryStream(fileBytes);//将内存流转化为工作簿NPOI.SS.UserModel.IWorkbook workbook = new NPOI.HSSF.UserModel.HSSFWorkbook(excelFileStream);//判断工作簿中是否有工作表if (!(workbook.NumberOfSheets > 0)){exceptionMsg = "工作簿中没有数据表";return dtExcel;}//获取第一个工作表NPOI.SS.UserModel.ISheet sheet = workbook.GetSheetAt(0);//PhysicalNumberOfRows 获取的是物理行数，也就是不包括那些空行（隔行）的情况。//判断工作表中是否有数据if (!(sheet.PhysicalNumberOfRows > 0)){exceptionMsg = "数据表为空";return dtExcel;}//将数据装到DataTable中//获取标题行NPOI.SS.UserModel.IRow rowHeader = sheet.GetRow(0);/*FirstCellNum：获取某行第一个单元格下标LastCellNum：获取某行的列数FirstRowNum：获取第一个实际行的下标LastRowNum：获取最后一个实际行的下标*///获取表格列数int cellCount = rowHeader.LastCellNum;//获取表格行数(最后一行下标+1)int rowCount = sheet.LastRowNum + 1;//创建dataTable中的列，循环添加标题行中各个单元格的数据for (int i = rowHeader.FirstCellNum; i < cellCount; i++){//遍历表头行中每一个单元格，获取标题行各个单元格的数据DataColumn dtColumn = new DataColumn(rowHeader.GetCell(i).StringCellValue);//将获取到的标题行的数据放到dataTable中dtExcel.Columns.Add(dtColumn);}int hang = sheet.FirstRowNum;try{//读取Excel中的数据//(sheet.FirstRowNum) 第一行是标题for (int i = sheet.FirstRowNum + 1; i < rowCount; i++){hang = i;//获取'i'行数据NPOI.SS.UserModel.IRow row = sheet.GetRow(i);//创建DataTable行DataRow dtRow = dtExcel.NewRow();if (row != null){//遍历excel中一行所有的单元格for (int j = row.FirstCellNum; j < cellCount; j++){if (row.GetCell(j) != null){switch (row.GetCell(j).CellType){case CellType.Formula://此处是处理公式数据，获取公式执行后的值HSSFFormulaEvaluator eva = new HSSFFormulaEvaluator(workbook);if (eva.Evaluate(row.GetCell(j)).CellType == CellType.Numeric)dtRow[j] = eva.Evaluate(row.GetCell(j)).NumberValue;elsedtRow[j] = eva.Evaluate(row.GetCell(j)).StringValue;break;default:dtRow[j] = row.GetCell(j).ToString();break;}}}}//新行添加到dataTable中dtExcel.Rows.Add(dtRow);}}catch (Exception){exceptionMsg = "第" + hang + "行数据存在异常";return dtExcel;}return dtExcel;
}

读取到数据后，生成二维码。

public string FileUploadQRCode(){DataTable dt = ExcelFile.GetExcel(Path, ref msg);//Excel文件路径Pathif (msg != ""){//返回失败信息return "{code: 0, msg: \"" + msg + "\"}");}for (int i = 0; i < dt.Rows.Count; i++){if (string.IsNullOrEmpty(dt.Rows[i]["名称"].ToString()) && string.IsNullOrEmpty(dt.Rows[i]["内容"].ToString()))//名称、内容代表表格列名continue;var text= dt.Rows[i]["名称"].ToString();var data = dt.Rows[i]["内容"].ToString();var str = "https://xx.shuangruixin.cn/api/xcx/tool.aspx?opt=MakeTextQRCode&data=" + data + "&text=" + text;//生成二维码服务地址SaveImageFromWeb(str, "C:\\Users\\Administrator\\Desktop\\二维码\\", text);}
}

其中生成二维码服务代码如下：

public void MakeTextQRCode()
{if (!string.IsNullOrEmpty(Request.QueryString["data"]) && !string.IsNullOrEmpty(Request.QueryString["text"])){string str = Request.QueryString["data"];BarcodeWriter writer = new BarcodeWriter();writer.Format = BarcodeFormat.QR_CODE;QrCodeEncodingOptions options = new QrCodeEncodingOptions(){DisableECI = true,//设置内容编码CharacterSet = "UTF-8",Width = 500,//设置二维码的宽度和高度Height = 600,Margin = 1//设置二维码的边距,单位不是固定像素};writer.Options = options;Bitmap image = writer.Write(str);#region 添加文本Bitmap backgroudImg = new Bitmap(image.Width, image.Height);backgroudImg.MakeTransparent();Graphics g2 = Graphics.FromImage(backgroudImg);g2.Clear(Color.Transparent);//画二维码到新的面板上g2.DrawImage(image, 0, 0);string content = Request.QueryString["text"];if (!string.IsNullOrEmpty(content)){FontFamily fontFamily = new FontFamily("楷体");System.Drawing.Font font1 = new System.Drawing.Font(fontFamily, 30f, FontStyle.Bold, GraphicsUnit.Pixel);//文字长度 int strWidth = (int)g2.MeasureString(content, font1).Width;//总长度减去文字长度的一半（居中显示）int wordStartX = (image.Width - strWidth) / 2;int wordStartY = image.Height - 55;g2.DrawString(content, font1, Brushes.Black, wordStartX, wordStartY);}g2.Dispose();#endregion//保存为PNG到内存流MemoryStream ms = new MemoryStream();backgroudImg.Save(ms, ImageFormat.Png);Response.ContentType = "image/png";//输出二维码图片Response.BinaryWrite(ms.GetBuffer());Response.End();}
}

最后将生成的二维码保存到指定的路径。

 public static int SaveImageFromWeb(string imgUrl, string path, string fileName){if (path.Equals(""))throw new Exception("未指定保存文件的路径");string imgName = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf("/") + 1);string defaultType = ".png";string[] imgTypes = new string[] { ".jpg", ".jpeg", ".png", ".gif", ".bmp" };string imgType = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf("."));foreach (string it in imgTypes){if (imgType.ToLower().Equals(it))break;if (it.Equals(".bmp"))imgType = defaultType;}HttpWebRequest request = (HttpWebRequest)WebRequest.Create(imgUrl);request.UserAgent = "Mozilla/6.0 (MSIE 6.0; Windows NT 5.1; Natas.Robot)";request.Timeout = 3000;WebResponse response = request.GetResponse();Stream stream = response.GetResponseStream();if (response.ContentType.ToLower().StartsWith("image/")){byte[] arrayByte = new byte[1024];int imgLong = (int)response.ContentLength;int l = 0;if (fileName == "")fileName = imgName;if (!Directory.Exists(path)){//创建文件夹Directory.CreateDirectory(path);}string URL = path + fileName + imgType;FileStream fso = new FileStream(URL, FileMode.Create);while (l < imgLong){int i = stream.Read(arrayByte, 0, 1024);fso.Write(arrayByte, 0, i);l += i;}fso.Close();stream.Close();response.Close();return 1;}else{return 0;}}