PDF合并及生成书签目录

# PDF合并及生成书签目录
```java
using System;
using System.Collections.Generic;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace MergePdfWithBookmarks
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> pdfFiles = new List<string>();
            pdfFiles.Add(@"d:\test\1.pdf");
            pdfFiles.Add(@"d:\test\2.pdf");
            pdfFiles.Add(@"d:\test\3.pdf");
            pdfFiles.Add(@"d:\test\4.pdf");
            //string[] pdfFiles = { "input1.pdf", "input2.pdf", "input3.pdf" };
            string outputPdf = @"d:\test\spp.pdf";
            try
            {
                // 创建一个新的PDF文档
                using (FileStream outputStream = new FileStream(outputPdf, FileMode.Create))
                {
                    using (Document document = new Document())
                    {
                        PdfCopy copy = new PdfCopy(document, outputStream);
                        document.Open();

// 创建一个列表来存储书签
                        List<Dictionary<string, object>> bookmarks = new List<Dictionary<string, object>>();

int pageNumber = 1;

foreach (string inputFile in pdfFiles)
                        {
                            string bookmarkTitle = Path.GetFileNameWithoutExtension(inputFile);
                            // 创建书签
                            Dictionary<string, object> bookmark = new Dictionary<string, object>();
                            bookmark["Title"] = $"Page {bookmarkTitle}";
                            bookmark["Action"] = "GoTo";
                            bookmark["Page"] = $"{pageNumber} Fit";
                            bookmarks.Add(bookmark);
                            // 打开输入PDF文档
                            using (PdfReader reader = new PdfReader(inputFile))
                            {
                                // 获取输入PDF文档的页数
                                int pageCount = reader.NumberOfPages;

// 遍历每一页
                                for (int i = 1; i <= pageCount; i++)
                                {
                                    // 将页面添加到新文档中
                                    PdfImportedPage importedPage = copy.GetImportedPage(reader, i);
                                    copy.AddPage(importedPage);
                                    pageNumber++;
                                }

}
                        }

// 将书签添加到新文档中
                        copy.Outlines = bookmarks;
                    }
                }

Console.WriteLine("PDF files merged successfully with generated bookmarks!");
            }
            catch (Exception ex)
            {
                Console.WriteLine("An error occurred: " + ex.Message);
            }

Console.WriteLine("PDFs merged successfully!");
        }

}

}
```