NewGaoKaoApi/PdfOpt/PdfOptHelper.cs

using static System.Net.Mime.MediaTypeNames;
using iText.Kernel.Pdf;
using iText.Kernel.Geom;
using iText.IO.Image;
using iText.Layout.Element;
using Image = iText.Layout.Element.Image;
using iText.Layout.Properties;
using iText.Layout;
using iText.Kernel.Font;
using iText.IO.Font;
using iText.Kernel.Colors;

namespace PDFGenerateApi
{
    public class PdfOptHelper
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="pagetitle"></param>
        /// <param name="headers"></param>
        /// <param name="dataModels"></param>
        /// <returns></returns>
        public static MemoryStream CreatePdf(string pagetitle, List<string> headers, List<dataModel> dataModels)
        {
            // 创建内存流
            using (var stream = new MemoryStream())
            {
                // 创建 PDF Writer
                PdfWriter writer = new PdfWriter(stream);
                PdfDocument pdf = new PdfDocument(writer);
                // 设置页面大小为横向 A4
                PageSize pageSize = PageSize.A4.Rotate();
                // 设置页面大小为 A4
                pdf.SetDefaultPageSize(pageSize);
                Document document = new Document(pdf);
                // 加载中文字体
                string fontsPath = System.IO.Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", "fonts", "NotoSansCJKsc-Regular.otf");
                //if (!File.Exists(fontsPath))
                //{
                //    bool aa = true;
                //    //  _logger.LogError($"Font file not found at path: {fontsPath}");
                //    //     return NotFound("Font file not found.");
                //}
                PdfFont font = PdfFontFactory.CreateFont(fontsPath, PdfEncodings.IDENTITY_H, PdfFontFactory.EmbeddingStrategy.PREFER_EMBEDDED);
                // 加载 logo 图像
                string logoPath = "https://i5.youzy.cn/util4y/media/files/20231026/7840b6f1f30c413eade15babc70be26e_%E5%BE%AE%E4%BF%A1%E5%9B%BE%E7%89%87_20230811154443.png"; // 确保 logo.png 放在 wwwroot 目录下
                ImageData imageData = ImageDataFactory.Create(logoPath);
                Image logo = new Image(imageData);
                logo.SetWidth(124);
                logo.SetHeight(40);
                // 将 logo 添加到文档中
                document.Add(logo);
                Paragraph title = CreateTitle(font, pagetitle);
                document.Add(title);
                // 添加标题下方内容
                Paragraph subtitle = CreateSubTitle(font, string.Format("最后修改时间:{0}", DateTime.Now.ToString("yyyy-MM-dd HH:mm")));
                document.Add(subtitle);
                // 添加表头
                //  string[] unversityheaders = { "志愿", "概率", "院校代码", "院校名称", "24招生计划", "历年", "2023", "2022", "2021" };
                Table universitytable = HeaderTable(font, 9, headers, new List<dataModel>() { });
                document.Add(universitytable);
                #region ***********写入表格
                // 创建一个 8列的表格，设置表格宽度为 100% 以适应页面宽度
                //  Table universitytable = new Table(9);
                // universitytable.SetWidth(UnitValue.CreatePercentValue(100));


                //int h = 0;
                //foreach (var header in unversityheaders)
                //{
                //    h++;
                //    if (h == 4)
                //    {
                //        universitytable.AddHeaderCell(new Cell().Add(new Paragraph(header).SetWidth(85).SetFont(font).SetBold().SetTextAlignment(TextAlignment.CENTER)));
                //    }
                //    else
                //    {
                //        universitytable.AddHeaderCell(new Cell().Add(new Paragraph(header).SetFont(font).SetBold().SetTextAlignment(TextAlignment.CENTER)));
                //    }
                //}

                //// 可选：添加表格数据，这里仅作为示例
                //for (int i = 1; i <= 1; i++)
                //{
                //    universitytable.AddCell(new Cell().Add(new Paragraph(i.ToString()).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("0.9").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("A999").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("山东师范大学(本科)(山东公办)省重点 保研 研究生院 省部共建山东 济南市/综合/公办/排名190" + i).SetWidth(85).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("100").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));

                //    universitytable.AddCell(new Cell().Add(new Paragraph("历史数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("2023数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("2022数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    universitytable.AddCell(new Cell().Add(new Paragraph("2021数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));

                //}
                //document.Add(universitytable);
                //// float[] columnWidths = { 0.5f, 0.5f, 1, 2, 1, 1, 1, 1, 1 };
                //Table majortable = new Table(9);
                //majortable.SetWidth(UnitValue.CreatePercentValue(100));
                //// 添加表头
                //string[] majorlistheaders = { "序号", "概率", "专业代码", "专业名称", "24招生计划", "历年", "2023", "2022", "2021" };
                //foreach (var header in majorlistheaders)
                //{
                //    majortable.AddHeaderCell(new Cell().Add(new Paragraph(header).SetFont(font).SetBold().SetTextAlignment(TextAlignment.CENTER)));
                //}


                //for (int i = 1; i <= 5; i++)
                //{
                //    majortable.AddCell(new Cell().Add(new Paragraph(i.ToString()).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("0.9").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("QL").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("垫子信息技术" + i).SetWidth(85).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("20").SetFont(font).SetTextAlignment(TextAlignment.CENTER)));

                //    majortable.AddCell(new Cell().Add(new Paragraph("录取人数\n计划人数\n最低分\n最低位次\n效位差" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("2023数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("2022数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                //    majortable.AddCell(new Cell().Add(new Paragraph("2021数据" + i).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));

                //}
                //document.Add(majortable);
                #endregion
                // 将表格添加到文档中
                // 关闭文档
                document.Close();
                // 返回 PDF 文件
                return stream;
            }

        }

        /// <summary>
        /// 标题
        /// </summary>
        /// <param name="font"></param>
        /// <param name="titletext"></param>
        /// <returns></returns>
        private static Paragraph CreateTitle(PdfFont font, string titletext)
        {
            Paragraph title = new Paragraph(titletext)
                  .SetTextAlignment(TextAlignment.CENTER)
                  .SetFont(font)
                  .SetBold()
                  .SetFontSize(16)
                  .SetMarginTop(20)
                  .SetMarginBottom(5);
            return title;
        }

        /// <summary>
        /// 创建副标
        /// </summary>
        /// <param name="font"></param>
        /// <param name="titletext"></param>
        /// <returns></returns>
        private static Paragraph CreateSubTitle(PdfFont font, string titletext)
        {
            Paragraph title = new Paragraph(titletext)
                    .SetTextAlignment(TextAlignment.CENTER)
                     .SetFont(font)
                     .SetFontColor(ColorConstants.GRAY)  // 设置字体颜色为灰色
                    .SetFontSize(12)
                    .SetMarginBottom(20);
            return title;
        }


        /// <summary>
        /// table表头
        /// </summary>
        /// <param name="tb"></param>
        /// <param name="headers"></param>
        /// <returns></returns>
        private static Table HeaderTable(PdfFont font, int tb, List<string> headers, List<dataModel> dataList)
        {
            Table table = new Table(tb);
            table.SetWidth(UnitValue.CreatePercentValue(100));


            int h = 0;
            foreach (var header in headers)
            {
                h++;
                if (h == 4)
                {
                    table.AddHeaderCell(new Cell().Add(new Paragraph(header).SetWidth(85).SetFont(font).SetBold().SetTextAlignment(TextAlignment.CENTER)));
                }
                else
                {
                    table.AddHeaderCell(new Cell().Add(new Paragraph(header).SetFont(font).SetBold().SetTextAlignment(TextAlignment.CENTER)));
                }
            }
            dataList.ForEach(a =>
            {
                table.AddCell(new Cell().Add(new Paragraph(a.id.ToString()).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                table.AddCell(new Cell().Add(new Paragraph(a.probability).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                table.AddCell(new Cell().Add(new Paragraph(a.universityCode).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                table.AddCell(new Cell().Add(new Paragraph(a.universityName).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                table.AddCell(new Cell().Add(new Paragraph(a.planName).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                table.AddCell(new Cell().Add(new Paragraph(a.history).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                a.years.ForEach(a =>
                {
                    table.AddCell(new Cell().Add(new Paragraph(a).SetFont(font).SetTextAlignment(TextAlignment.CENTER)));
                });
            });
            return table;
        }


        public class dataModel
        {
            public int id { get; set; }

            /// <summary>
            /// 
            /// </summary>
            public string probability { get; set; }

            /// <summary>
            /// 
            /// </summary>
            public string universityCode { get; set; }

            /// <summary>
            /// 
            /// </summary>
            public string universityName { get; set; }


            public string planName { get; set; }


            public string history { get; set; }

            public List<string> years { get; set; }


        }
    }
}