拉勾技术人年薪【50W+】成长计划!

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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