1、帮助类
1 public static class PdfHelper
2 {
3 #region 从http链接下载
4 public static void Download(string url, string name, System.Web.Mvc.Controller controller)
5 {
6 var bytes = GetByteByRemoteURL(url);
7 controller.Response.Charset = "UTF-8";
8 controller.Response.ContentType = "application/octet-stream";
9 controller.Response.ContentEncoding = Encoding.Default;
10 controller.Response.AddHeader("Content-Disposition", "attachment; filename=" + name.Replace(" ", "") + ".pdf");
11 controller.Response.BinaryWrite(bytes);
12 controller.Response.Flush();
13 controller.Response.End();
14 }
15 #endregion
16
17 #region 调用本地文件使用返回pdfbyte数组
18
19 /// <summary>
20 /// 调用本地文件使用返回pdfbyte数组
21 /// </summary>
22 /// <param name="srcPdfFile">‘D:\in2434341555551.pdf’</param>
23 /// <returns></returns>
24
25 public static byte[] GetSignaturePDFByte(string srcPdfFile)
26 {
27 using (FileStream fsRead = new FileStream(srcPdfFile, FileMode.Open, FileAccess.Read, FileShare.Read))
28 {
29 int fsLen = (int)fsRead.Length;
30 byte[] hebyte = new byte[fsLen];
31 fsRead.Read(hebyte, 0, hebyte.Length);
32 return hebyte;
33 }
34 }
35
36 #endregion 调用本地文件使用返回pdfbyte数组
37
38 #region 从网站上下载pdf，转化为字节流
39 /// <summary>
40 /// 从网站上下载pdf，转化为字节流
41 /// </summary>
42 /// <param name="srcPdfFile">文件地址：'https://******/group2/M00/00/04/wKj-mlpcoZ2IUbK5AACrpaV6k98AAAB6gAAAAAAAKu9562.pdf'</param>
43
44 /// <returns></returns>
45 public static Byte[] GetByteByRemoteURL(string srcPdfFile)
46 {
47 byte[] arraryByte;
48 HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(srcPdfFile);
49 req.Method = "GET";
50 using (WebResponse wr = req.GetResponse())
51 {
52 StreamReader responseStream = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);
53 int length = (int)wr.ContentLength;
54 byte[] bs = new byte[length];
55
56 HttpWebResponse response = wr as HttpWebResponse;
57 Stream stream = response.GetResponseStream();
58
59 //读取到内存
60 MemoryStream stmMemory = new MemoryStream();
61 byte[] buffer1 = new byte[length];
62 int i;
63 //将字节逐个放入到Byte 中
64 while ((i = stream.Read(buffer1, 0, buffer1.Length)) > 0)
65 {
66 stmMemory.Write(buffer1, 0, i);
67 }
68 arraryByte = stmMemory.ToArray();
69 stmMemory.Close();
70 }
71 return arraryByte;
72 }
73
74 #endregion 从网站上下载pdf，转化为字节流
75
76 }
2、调用方法
1 public ActionResult Down()
2 {
3 PdfHelper.Download("http链接", "导出文件名字", this);
4 return new EmptyResult();
5 }
3、前端使用
1 function Download() {
2 location.href = "/xx/down";
3 }
