从其它站点下载文件到服务器

//声明一个请求

WebRequest myWebRequest = WebRequest.Create("http://media.wiley.com/product_data/coverImage80/0X/07645786/076457860X.jpg");

//穿过需要身份验证的代理服务器

NetworkCredential myCred = new NetworkCredential("Stone Sun","XX","bqc");

WebProxy myProxy = new WebProxy("bqcProxy", 80);

myProxy.Credentials = myCred;

myWebRequest.Proxy = myProxy;

//声明来自请求的响应

WebResponse wrs = myWebRequest.GetResponse();

//声明要保存的文件,并将响应写入文件.

FileStream fs = new FileStream("d:\\text.jpg", FileMode.Create);

BinaryWriter w = new BinaryWriter(fs);

BinaryReader br = new BinaryReader(wrs.GetResponseStream());

byte[] btTest = br.ReadBytes(1024);

while(btTest.Length > 0)

br.Close();

w.Close();

fs.Close();