This article uses three examples to introduce the usage of HttpWebRequest post in asp.net and the convenience methods in various places. If you need it, you can refer to this article.
First look at a simple measure
| The Code is as follows: |
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Using System;
Using System. IO;
Using System. Collections;
Using System. Data;
Using System. Linq;
Using System. Web;
Using System. Web. Services;
Using System. Web. Services. Protocols;
Using System. Xml. Linq;
Using System. Net;
Using System. Text; Namespace WebApplication1
{ [WebService (Namespace = "http://www.hzhuti.com/")]
[WebServiceBinding (ConformsTo = WsiProfiles. BasicProfile1_1)]
Public class Handler1: IHttpHandler
{ Public void ProcessRequest (HttpContext context)
{
HttpWebRequest req = (HttpWebRequest) HttpWebRequest. Create (http://www.bKjia. c0m );
Encoding encoding = Encoding. UTF8;
String param = "ie = UTF-8 & source = txt & query = hello & t = 1327829764203 & token = 8a7dcbacb3ed72cad9f3fb079809a127 & from = auto & to = auto ";
// Encoding. GetBytes (postData );
Byte [] bs = Encoding. ASCII. GetBytes (param );
String responseData = String. Empty;
Req. Method = "POST ";
Req. ContentType = "application/x-www-form-urlencoded ";
Req. ContentLength = bs. Length;
Using (Stream reqStream = req. GetRequestStream ())
{
ReqStream. Write (bs, 0, bs. Length );
ReqStream. Close ();
}
Using (HttpWebResponse response = (HttpWebResponse) req. GetResponse ())
{
Using (StreamReader reader = new StreamReader (response. GetResponseStream (), encoding ))
{
ResponseData = reader. ReadToEnd (). ToString ();
}
Context. Response. Write (responseData );
}
}
Public bool IsReusable
{
Get
{
Return false;
}
}
}
} |
HttpWebRequest sends a POST request for Automatic Login
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<Form name = "form1" action = "http: www.breakn.com/login.asp" method = "post">
<Input type = "text" name = "userid" value = ">
<Input type = "password" name = "password" value = "">
</Form> |
From the form, we can see that the form has two form fields, one is userid and the other is password. Therefore, data submitted in the form of POST should contain these two fields.
The data format of POST is as follows:
Form domain name 1 = value 1 & form domain name 2 = value 2 & form Domain Name 3 = value 3 ......
Note that the "value" must pass through HTMLEncode, that is, it cannot contain the "<>=&" symbols.
The data to be submitted in this example should be:
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Userid = value1 & password = value2
String strId = "guest ";
String strPassword = "123456 "; ASCIIEncoding encoding = new ASCIIEncoding ();
String postData = "userid =" + strId;
PostData + = ("& amp; password =" + strPassword ); Byte [] data = encoding. GetBytes (postData ); // Prepare web request...
HttpWebRequest myRequest =
(HttpWebRequest) WebRequest. Create ("http: www.here.com/login.asp "); MyRequest. Method = "POST ";
MyRequest. ContentType = "application/x-www-form-urlencoded ";
MyRequest. ContentLength = data. Length;
Stream newStream = myRequest. GetRequestStream (); // Send the data.
NewStream. Write (data, 0, data. Length );
NewStream. Close (); // Get response
HttpWebResponse myResponse = (HttpWebResponse) myRequest. GetResponse ();
StreamReader reader = new StreamReader (response. GetResponseStream (), Encoding. Default );
String content = reader. ReadToEnd ();
Console. WriteLine (content ); |
When using HttpWebRequest POST data to the HTTP protocol on the server, the following parameters are transmitted to the server: HTTP Header/GET String/Body in the middle of the POST
The following sample code demonstrates how to simply POST data to the server.
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// Send the request
String requestBody = string. format ("{0 }={ 1} & {2 }={ 3} & {4 }={ 5} & {6 }={ 7} & {8 }= {9 }"
, HttpUtility. UrlEncode ("version_id", Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode (m_VersionNo, Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode ("merchant_id", Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode (m_MerchantID, Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode ("verifystring", Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode (hashStr. ToString (). ToLower (), Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode ("order_date", Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode (m_OrderDate, Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode ("order_id", Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode (m_OrderID, Encoding. GetEncoding ("GB2312 "))
, HttpUtility. UrlEncode ("retmode", Encoding. GetEncoding ("GB2312 "))
, String. Empty
); HttpWebRequest request = (HttpWebRequest) HttpWebRequest. Create (m_GatewayURL );
Request. Method = "POST ";
Request. KeepAlive = false;
Request. ContentType = "application/x-www-form-urlencoded ";
Byte [] aryBuf = Encoding. GetEncoding ("GB2312"). GetBytes (requestBody );
Request. ContentLength = aryBuf. Length;
Using (Stream writer = request. GetRequestStream ())
{
Writer. Write (aryBuf, 0, aryBuf. Length );
Writer. Close ();
Writer. Dispose ();
}
String ret = string. Empty;
Using (WebResponse response = request. GetResponse ())
{
StreamReader reader = new StreamReader (response. GetResponseStream ()
, Encoding. GetEncoding ("GB2312 ")
);
Ret = reader. ReadToEnd ();
Reader. Close ();
Reader. Dispose ();
} |
