img标签加载FTP的图片 C#

时间：2014-09-17 20:03:52 阅读：268 评论：0 收藏：0 [点我收藏+]

好吧，我是菜鸟，这是我今天遇到的问题，什么也不会，得高人指点

1.使用FtpWebRequest下载图片，以流存贮

2.在ashx文件里面直接已流方式（HttpContext.Current.Response.ContentType = "image/jpeg";）输出图片

3.页面的img标签的src指向ashx文件

还是贴代码实际点

 1   public void ViewFTPImageFile(string strFullPath)
 2         {
 3             
 4             //定义FTP请求对象
 5             FtpWebRequest ftpRequest = null;
 6             //定义FTP响应对象
 7             FtpWebResponse ftpResponse = null;
 8 
 9             //存储流
10             FileStream saveStream = null;
11             //FTP数据流
12             Stream ftpStream = null;
13             StreamReader reader = null;
14             try
15             {
16                 //生成FTP请求对象
17                 ftpRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFullPath));
18 
19                 //设置下载文件方法
20                 ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;
21 
22 
23                 //设置文件传输类型
24                 ftpRequest.UseBinary = true;
25                 ftpRequest.KeepAlive = false;
26                 ftpRequest.UsePassive = true;
27                 //设置登录FTP帐号和密码
28                 ftpRequest.Credentials = new NetworkCredential(entity.User_Name, entity.Pwd);
29 
30                 ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();                //获取FTP响应流对象
31                 ftpStream = ftpResponse.GetResponseStream();
32 
33                 int bufferSize = 2048;
34 
35                 byte[] buffer = new byte[bufferSize];
36 
37 
38                 HttpContext.Current.Response.ContentType = "image/jpeg";
39                 HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.Public);
40                 HttpContext.Current.Response.BufferOutput = false;
41 
42                 //while ((readCount = ftpStream.Read(buffer, 0, 2048)) > 0)
43                 //{
44                 ftpStream.Read(buffer, 0, bufferSize);
45 
46                 HttpContext.Current.Response.BinaryWrite(buffer);
47                 HttpContext.Current.Response.Flush();
48                 //}
49                 ftpStream.Close();
50 
51                 //HttpContext.Current.Response.Close();
52 
53 
54             }
55             catch (Exception ex)
56             {
57                 Console.WriteLine(ex.Message);
58 
59             }
60             finally
61             {
62                 if (ftpStream != null)
63                 {
64                     ftpStream.Close();
65                 }
66 
67                 if (saveStream != null)
68                 {
69                     saveStream.Close();
70                 }
71 
72                 if (ftpResponse != null)
73                 {
74                     ftpResponse.Close();
75                 }
76             }
77         }