利用WebRequest来实现模拟浏览器通过Post方式向服务器提交数据

//通过Post发送的数据

string payload=”chkbook=book&keyword=管理”;

WebRequest req = WebRequest.Create(”http://localhost/pceo/Search.aspx”);

req.Method = “POST”;

req.ContentType = “application/x-www-form-urlencoded”;

StringBuilder UrlEncoded = new StringBuilder();

Char[] reserved = {’?', ‘=’, ‘&’};

byte[] SomeBytes = null;

if (payload != null)

{

int i=0, j;

while(i<payload.Length)

{

j=payload.IndexOfAny(reserved, i);

if (j==-1)

{

UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, payload.Length-i),System.Text .Encoding .GetEncoding (”gb2312″)));

break;

}

UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, j-i),System.Text .Encoding .GetEncoding (”gb2312″)));

UrlEncoded.Append(payload.Substring(j,1));

i = j+1;

}

SomeBytes = Encoding.Default.GetBytes(UrlEncoded.ToString());

req.ContentLength = SomeBytes.Length;

Stream newStream = req.GetRequestStream();

newStream.Write(SomeBytes, 0, SomeBytes.Length);

newStream.Close();

}

else

{

req.ContentLength = 0;

}

try

{

WebResponse result = req.GetResponse();

Stream ReceiveStream = result.GetResponseStream();

Byte[] read = new Byte[512];

int bytes = ReceiveStream.Read(read, 0, 512);

txtHTML.InnerHtml = “”;

while (bytes > 0)

{

// 注意：

// 下面假定响应使用 UTF-8 作为编码方式。

// 如果内容以 ANSI 代码页形式（例如，932）发送，则使用类似下面的语句：

// Encoding encode = System.Text.Encoding.GetEncoding(”shift-jis”);

Encoding encode = System.Text.Encoding.GetEncoding(”gb2312″);

txtHTML.InnerHtml = txtHTML.InnerHtml + encode.GetString(read, 0, bytes);

bytes = ReceiveStream.Read(read, 0, 512);

}

}

catch(Exception)

{

txtHTML.InnerHtml = “检索页时出错”;

}