c#根据路径（url）下载图片

方法一：根据路径下载图片

1 /// <summary>
 2 /// 图片另存为
 3 /// </summary>
 4 /// <param name="url">路径</param>
 5 public void imgsave(string url)
 6 {
 7 　　//http://203.156.245.58/sipgl/index.jsp
 8 　　url = "http://203.156.245.58/sipgl/login/img";
 9 　　webrequest imgrequest = webrequest.create(url);
10 
11 　　httpwebresponse res;
12 　　try
13 　　{
14 　　　　res = (httpwebresponse)imgrequest.getresponse();
15 　　}
16 　　　　catch (webexception ex)
17 　　{
18 
19 　　res = (httpwebresponse)ex.response;
20 　　}
21 
22 　　if (res.statuscode.tostring() == "ok")
23 　　{
24 　　　　system.drawing.image downimage = system.drawing.image.fromstream(imgrequest.getresponse().getresponsestream());
25 
26 　　　　string deerory = string.format(@"d:\img\{0}\", datetime.now.tostring("yyyy-mm-dd"));
27 
28 　　　　string filename = string.format("{0}.png", datetime.now.tostring("hhmmssffff"));
29 
30 
31 　　if (!system.io.directory.exists(deerory))
32 　　{
33 　　　　system.io.directory.createdirectory(deerory);
34 　　}
35 　　　　downimage.save(deerory + filename);
36 　　　　downimage.dispose();
37 　　}
38 
39 }
40 
41  

 

 

 

方法二：根据路径下载图片 

 

 1      /// <summary>
 2         /// 下载图片
 3         /// </summary>
 4         /// <param name="picurl">图片http地址</param>
 5         /// <param name="savepath">保存路径</param>
 6         /// <param name="timeout">request最大请求时间，如果为-1则无限制</param>
 7         /// <returns></returns>
 8         public  bool downloadpicture(string picurl, string savepath, int timeout)
 9         {
10             picurl = "http://203.156.245.58/sipgl/login/img";
11             savepath = "d:/img/"+datetime.now.tostring("hhmmssffff")+".jpg";
12             bool value = false;
13             webresponse response = null;
14             stream stream = null;
15             try
16             {
17                 httpwebrequest request = (httpwebrequest)webrequest.create(picurl);
18                 if (timeout != -1) request.timeout = timeout;
19                 response = request.getresponse();
20                 stream = response.getresponsestream();
21                 if (!response.contenttype.tolower().startswith("text/"))
22                     value = savebinaryfile(response, savepath);
23             }
24             finally
25             {
26                 if (stream != null) stream.close();
27                 if (response != null) response.close();
28             }
29             return value;
30         }
31         private static bool savebinaryfile(webresponse response, string savepath)
32         {
33             bool value = false;
34             byte[] buffer = new byte[1024];
35             stream outstream = null;
36             stream instream = null;
37             try
38             {
39                 if (file.exists(savepath)) file.delete(savepath);
40                 outstream = system.io.file.create(savepath);
41                 instream = response.getresponsestream();
42                 int l;
43                 do
44                 {
45                     l = instream.read(buffer, 0, buffer.length);
46                     if (l > 0) outstream.write(buffer, 0, l);
47                 } while (l > 0);
48                 value = true;
49             }
50             finally
51             {
52                 if (outstream != null) outstream.close();
53                 if (instream != null) instream.close();
54             }
55             return value;
56         }

 

 

方法三  根据路径下载图片

 

 1     public image getimage(string url,out string imagestrcookie)
 2         {
 3            
 4             httpwebrequest request = (httpwebrequest)webrequest.create("http://203.156.245.58/sipgl/login/img");
 5             request.method = "get";
 6             webresponse response = request.getresponse();
 7             imagestrcookie = "";
 8             if (response.headers.haskeys()&&null !=response.headers["set-cookie"])
 9             {
10                 imagestrcookie= response.headers.get("set-cookie");
11             }
12             return image.fromstream(response.getresponsestream());
13             
14         }