一个PDF合并操作实现类，利用iTextSharp控件实现

来源：互联网发布：怎么用js隐藏div 编辑：程序博客网时间：2024/04/28 15:18

实现PDF文档的合并，默认使用A3纸张来合并，可以根据需要修改。

using iTextSharp.text;
using iTextSharp.text.pdf;
/// <summary> 
    /// pdf文件合并处理类 
    /// </summary> 
    class PDFMergeManager
    {
        private PdfWriter pw;
        private PdfReader reader;       
        private Document document;
        private PdfContentByte cb;
        private PdfImportedPage newPage;
        /// <summary> 
        /// 通过输出文件来构建合并管理，合并到新增文件中,合并完成后调用FinishedMerge方法 
        /// </summary> 
        /// <param name="sOutFiles"></param> 
        public PDFMergeManager(string sOutFiles)
        {
            document = new Document(PageSize.A3);         
            if (File.Exists(sOutFiles) && !MessageHelper.ShowQuestion("对应的文件已经存在，文件目录:/r/n "+sOutFiles+"/r/n是否覆盖该文件？"))
            {
                document = null;
                throw new IOException("用户取消操作");                
            }
            pw = PdfWriter.GetInstance(document, new FileStream(sOutFiles, FileMode.Create));
            document.Open();
            cb = pw.DirectContent;
        }       
        /// <summary> 
        /// 通过文件流来合并文件，合并到当前的可写流中，合并完成后调用FinishedMerge方法 
        /// </summary> 
        /// <param name="sm"></param> 
        public PDFMergeManager(Stream sm)
        {
            document = new Document();
            pw = PdfWriter.GetInstance(document, sm);            
            document.Open();
            cb = pw.DirectContent;
        }
        /// <summary> 
        /// 合并文件 
        /// </summary> 
        /// <param name="sFiles">需要合并的文件路径名称</param> 
        /// <returns></returns> 
        public bool MergeFile(string sFiles)
        {
            reader = new PdfReader(sFiles);           
            {
                int iPageNum = reader.NumberOfPages;
                for (int j = 1; j <= iPageNum; j++)
                {
                    
                    newPage = pw.GetImportedPage(reader, j);
                    Rectangle r = reader.GetPageSize(j);
                    document.SetPageSize(r);
                    document.NewPage();
                    cb.AddTemplate(newPage, 0, 0);                    
                }
               
            }
            reader.Close();            
            return true;
        }
        /// <summary> 
        /// 通过字节数据合并文件 
        /// </summary> 
        /// <param name="pdfIn">PDF字节数据</param> 
        /// <returns></returns> 
        public bool MergeFile(byte[] pdfIn)
        {
            reader = new PdfReader(pdfIn);
            {
                int iPageNum = reader.NumberOfPages;
                for (int j = 1; j <= iPageNum; j++)
                {
                    newPage = pw.GetImportedPage(reader, j);
                    Rectangle r = reader.GetPageSize(j);
                    document.SetPageSize(r);
                    document.NewPage();
                    cb.AddTemplate(newPage, 0, 0);
                }
            }
            reader.Close();
            return true;
        }
        /// <summary> 
        /// 通过PDF文件流合并文件 
        /// </summary> 
        /// <param name="pdfStream">PDF文件流</param> 
        /// <returns></returns> 
        public bool MergeFile(Stream pdfStream)
        {
            reader = new PdfReader(pdfStream);
            {
                int iPageNum = reader.NumberOfPages;
                for (int j = 1; j <= iPageNum; j++)
                {
                    newPage = pw.GetImportedPage(reader, j);
                    Rectangle r = reader.GetPageSize(j);
                    document.SetPageSize(r);
                    document.NewPage();
                    cb.AddTemplate(newPage, 0, 0);
                }
            }
            reader.Close();
            return true;
        }
        /// <summary> 
        /// 通过网络地址来合并文件 
        /// </summary> 
        /// <param name="pdfUrl">需要合并的PDF的网络路径</param> 
        /// <returns></returns> 
        public bool MergeFile(Uri pdfUrl)
        {
            reader = new PdfReader(pdfUrl);
            {
                int iPageNum = reader.NumberOfPages;
                for (int j = 1; j <= iPageNum; j++)
                {
                    newPage = pw.GetImportedPage(reader, j);
                    Rectangle r = reader.GetPageSize(j);
                    document.SetPageSize(r);
                    document.NewPage();
                    cb.AddTemplate(newPage, 0, 0);
                }
            }
            reader.Close();
            return true;
        }
        /// <summary> 
        /// 完成合并 
        /// </summary> 
        public void FinishedMerge()
        {
            try
            {
                if (reader != null)
                {
                    reader.Close();
                }
                if (pw != null)
                {
                    pw.Flush();
                    pw.Close();
                }
                if (document.IsOpen())
                {
                    document.Close();
                }
            }
            catch
            {
            }
        }        
    }