asp.net jpg 转 PDF 并提供下载

时间：2010-09-27 来源：kklldog

1         /// <summary>
2         /// 在服务器上生成一个PDF COPY
3         /// </summary>
4         private void CreatePDF()
5         {
6             var bytes = GetData();
7
8             int width = bytes.ToImage().Width;
9             int height = bytes.ToImage().Height;
10             Document document = new Document(new Rectangle(width, height), 0, 0, 0, 0);
11             using (var stream = new FileStream(MapPath("~/views") + "/print.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
12             {
13                 PdfWriter.GetInstance(document, stream);
14                 document.Open();
15                 using (Stream imageStream = new MemoryStream(bytes))
16                 {
17                     var image = iTextSharp.text.Image.GetInstance(imageStream);
18                     document.Add(image);
19                 }
20                 document.Close();
21             }
22         }
23
24
25         /// <summary>
26         /// 获取缓存中的图片数据
27         /// </summary>
28         /// <returns></returns>
29         private byte[] GetData()
30         {
31             WebClient client = new WebClient();
32             string id = Request.QueryString[0];
33             string url = "http://" + Request.Url.Authority + "/GetImagePrint.ashx?id=" + id;
34             WebClient wc = new WebClient();
35
36             var bytes = wc.DownloadData(url);
37             return bytes;
38         }
39
40
41         public byte[] StreamToBytes(Stream stream)
42         {
43             byte[] bytes = new byte[stream.Length];
44             stream.Read(bytes, 0, bytes.Length);
45
46             // 设置当前流的位置为流的开始
47             stream.Seek(0, SeekOrigin.Begin);
48             return bytes;
49         }
50
51         /// <summary>
52         /// 下载到本地
53         /// </summary>
54         /// <param name="bytes"></param>
55         /// <param name="fileType"></param>
56         public void Download(byte[] bytes ,string fileType)
57         {
58             Response.Buffer = true;
59            // Page.Response.Clear();//清除缓冲区所有内容
60             Page.Response.ContentType = "application/octet-stream";
61             Page.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("print."+fileType));
62             byte[] file = bytes;
63             Response.BinaryWrite(file);
64             Response.Flush();
65             Response.End();
66         }