前段时间公司的产品,要做一个新功能,签章(就是把需要的数据整理成PDF很标准的文件,然后在盖上我们在服务器上面的章)
然后我就在百度上找了找,发现搞PDF的类库很少,要么就要钱,要么就有水印,破解版的没找到。
先讲一讲我是怎么生成PDF的
1、生成PDF
这里用到了 Spire.Pdf 这个类库可以在NuGet里面搜索到,上面带个小红标的就是免费版本。
当然也可以去他们的官网,上面还有文档(https://www.e-iceblue.cn/Introduce/Spire-PDF-NET.html)。
代码(这是我自己写的一个测试的表格)
public static void abc() { //创建PDF文档 Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument(); //添加一页 PdfPageBase page = doc.Pages.Add(); //设置字体 PdfTrueTypeFont font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 20f), true); PdfTrueTypeFont font1 = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 11f), true); //创建一个PdfGrid对象 PdfGrid grid = new PdfGrid(); //这一段的内容是在表格只玩显示一些数据 根据坐标定位 第一个是内容,第二个是字体,第三个是颜色,第四第五是坐标 page.Canvas.DrawString("XXXXXXXX管理中心回单", font, new PdfSolidBrush(System.Drawing.Color.Black), 130, 10); page.Canvas.DrawString("编号:31231", font1, new PdfSolidBrush(System.Drawing.Color.Black), 380, 60); page.Canvas.DrawString("经办人:XXXX", font1, new PdfSolidBrush(System.Drawing.Color.Black), 60, 250); page.Canvas.DrawString("打印日期:2020/06/15", font1, new PdfSolidBrush(System.Drawing.Color.Black), 380, 250); //设置单元格边距 grid.Style.CellPadding = new PdfPaddings(1, 1, 4, 4); //设置表格默认字体 grid.Style.Font = new PdfTrueTypeFont(new System.Drawing.Font("Microsoft Yahei", 12f), true); //添加4行4列 PdfGridRow row1 = grid.Rows.Add(); PdfGridRow row2 = grid.Rows.Add(); PdfGridRow row3 = grid.Rows.Add(); PdfGridRow row4 = grid.Rows.Add(); PdfGridRow row5 = grid.Rows.Add(); PdfGridRow row6 = grid.Rows.Add(); grid.Columns.Add(4); //设置列宽 foreach (PdfGridColumn col in grid.Columns) { col.Width = 120f; } //写入数据 第一行第一个格式的值,第一行第二个格子的值 row1.Cells[0].Value = "收款单位"; row1.Cells[1].Value = "{DW}"; row2.Cells[0].Value = "收款单位"; row2.Cells[1].Value = "{DW}"; row3.Cells[0].Value = "汇款时间"; row3.Cells[1].Value = "2016/06/02"; row3.Cells[2].Value = "金额小写"; row3.Cells[3].Value = "¥231"; row4.Cells[0].Value = "金额合计大写"; row4.Cells[1].Value = "大苏打实打实"; row5.Cells[0].Value = "用途:" + "付XXXX2020年04月至2020年04月"; row6.Cells[0].Value = "提示:回单可重复打印,请勿重复XXX"; //row5.Cells[0].Height = (float)20; //水平和垂直合并单元格 从那个格子开始合并几个(包含当前格子) row1.Cells[1].ColumnSpan = 3; row2.Cells[1].ColumnSpan = 3; row4.Cells[1].ColumnSpan = 3; row5.Cells[0].ColumnSpan = 2; row5.Cells[2].ColumnSpan = 2; row6.Cells[0].ColumnSpan = 2; row6.Cells[2].ColumnSpan = 2; //这个是垂直合并,但是我之前合并的没有效果 row5.Cells[1].RowSpan = 2; //设置单元格内文字对齐方式 row1.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row1.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row2.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row2.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row3.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row3.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row3.Cells[2].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row3.Cells[3].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row4.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row4.Cells[1].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row5.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); row6.Cells[0].StringFormat = new PdfStringFormat(PdfTextAlignment.Center); //设置单元格背景颜色 //row1.Cells[0].Style.BackgroundBrush = PdfBrushes.Gray; //row3.Cells[3].Style.BackgroundBrush = PdfBrushes.Green; //row4.Cells[3].Style.BackgroundBrush = PdfBrushes.MediumVioletRed; //设置边框颜色、粗细 PdfBorders borders = new PdfBorders(); borders.All = new PdfPen(System.Drawing.Color.Black, 0.1f); foreach (PdfGridRow pgr in grid.Rows) { foreach (PdfGridCell pgc in pgr.Cells) { pgc.Style.Borders = borders; } } //保存到文档 //在指定为绘入表格 grid.Draw(page, new PointF(30, 80)); doc.SaveToFile(@"路径"); //这句是在浏览器重打开这个PDF System.Diagnostics.Process.Start(@"路径"); }
保存我们看一下
2、之后就是关于PDF一些转换的操作了(PDF转base64,转图片之类的,我把代码贴到下面)
- 这个用到了iTextSharp类库,也可以在Nuget下载到
/// <summary> /// 图片转pdf /// </summary> /// <param name="jpgfile"></param> /// <param name="pdf"></param> public static bool ConvertJPG2PDF(string jpgfile, string pdf) { try { var document = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 25); using (var stream = new FileStream(pdf, FileMode.Create, FileAccess.Write, FileShare.None)) { PdfWriter.GetInstance(document, stream); document.Open(); using (var imageStream = new FileStream(jpgfile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { var image = iTextSharp.text.Image.GetInstance(imageStream); if (image.Height > iTextSharp.text.PageSize.A4.Height - 25) { image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25); } else if (image.Width > iTextSharp.text.PageSize.A4.Width - 25) { image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25); } image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE; document.NewPage(); document.Add(image); } document.Close(); } return true; } catch (Exception ex) { throw ex; } }
- 这个用的是(O2S.Components.PDFRender4NET)
/// <summary> /// pdf转img /// </summary> /// <param name="path">pdf位置</param> /// <param name="path2">img位置</param> public static void Pdf2Img(string path, string path2) { PDFFile pdfFile = PDFFile.Open(path); //实例化一个PdfDocument类对象,并加载PDF文档 using (Spire.Pdf.PdfDocument doc = new Spire.Pdf.PdfDocument()) { doc.LoadFromFile(path); //调用方法SaveAsImage()将PDF第一页保存为Bmp格式 System.Drawing.Image bmp = doc.SaveAsImage(0); // //调用另一个SaveAsImage()方法,并将指定页面保存保存为Emf、Png System.Drawing.Image emf = doc.SaveAsImage(0, Spire.Pdf.Graphics.PdfImageType.Bitmap); System.Drawing.Image zoomImg = new Bitmap((int)(emf.Size.Width * 2), (int)(emf.Size.Height * 2)); using (Graphics g = Graphics.FromImage(zoomImg)) { g.ScaleTransform(2.0f, 2.0f); g.DrawImage(emf, new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), emf.Size), GraphicsUnit.Pixel); zoomImg.Save(path2, ImageFormat.Jpeg); zoomImg.Dispose(); emf.Dispose(); bmp.Dispose(); } doc.Close(); doc.Dispose(); } }
- 这个和上面用的也是同一个(我觉得这个比较好用一些)
/// <summary> /// 将PDF文档转换为图片的方法 /// </summary> /// <param name="pdfInputPath">PDF文件路径</param> /// <param name="imageOutputPath">图片输出路径</param> /// <param name="imageName">生成图片的名字</param> /// <param name="startPageNum">从PDF文档的第几页开始转换</param> /// <param name="endPageNum">从PDF文档的第几页开始停止转换</param> /// <param name="imageFormat">设置所需图片格式</param> /// <param name="definition">设置图片的清晰度,数字越大越清晰</param> public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath, string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition) { PDFFile pdfFile = null; FileStream fs = null; try { fs = new FileStream(pdfInputPath, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite); pdfFile = PDFFile.Open(fs); if (startPageNum <= 0) { startPageNum = 1; } if (endPageNum > pdfFile.PageCount) { endPageNum = pdfFile.PageCount; } if (startPageNum > endPageNum) { int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum; } string path = imageOutputPath + imageName + "1" + "." + imageFormat.ToString(); Logger.WriteLogs("PDFIMG:" + path); using (Bitmap pageImage = pdfFile.GetPageImage(0, 56 * (int)definition)) { if (File.Exists(path)) { using (FileStream f = new FileStream(path, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)) { pageImage.Save(f, ImageFormat.Jpeg); pageImage.Dispose(); } } } fs.Flush(); } catch (Exception ex) { throw new Exception(ex.Message); } finally { if (pdfFile != null) { pdfFile.Dispose(); } else if (fs != null) { fs.Close(); fs.Dispose(); } } } public enum Definition { One = 1, Two = 2, Three = 3, Four = 4, Five = 5, Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10 }
- PDF转Base64
-
/// <summary> /// pdf转base64 /// </summary> /// <param name="filePath"></param> /// <returns></returns> public static string PdfWord_To_Base64(string filePath) { try { if (!string.IsNullOrWhiteSpace(filePath.Trim())) { FileStream fileStream = new FileStream(filePath, FileMode.OpenOrCreate); byte[] bt = new byte[fileStream.Length]; fileStream.Read(bt, 0, bt.Length); fileStream.Close(); fileStream.Dispose(); return Convert.ToBase64String(bt); } else { return "请输入正确的路径"; } } catch (Exception ex) { throw ex; } }
我主要也就用到这些,之后在发现,我在往上加
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