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C#实现通过HttpWebRequest发送POST请求实现网站自动登陆
怎样通过HttpWebRequest 发送 POST 请求到一个网页服务器?例如编写个程序实现自动用户登录,自动提交表单数据到网站等。
假如某个页面有个如下的表单(Form):
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
<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>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
从表单可看到表单有两个表单域,一个是userid另一个是password,所以以POST形式提交的数据应该包含有这两项。
其中POST的数据格式为:
表单域名称1=值1&表单域名称2=值2&表单域名称3=值3……
要注意的是“值”必须是经过HTMLEncode的,即不能包含“<>=&”这些符号。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
本例子要提交的数据应该是:
userid=value1&password=value2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
用C#写提交程序:
string strId = "guest";
string strPassword= "123456";
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
ASCIIEncoding encoding=new ASCIIEncoding();
string postData="userid="+strId;
postData += ("&password="+strPassword);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte[] data = encoding.GetBytes(postData);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// Prepare web request![](https://www.cnblogs.com/Images/dot.gif)
HttpWebRequest myRequest =
(HttpWebRequest)WebRequest.Create("http://www.here.com/login.asp");
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
myRequest.Method = "POST";
myRequest.ContentType="application/x-www-form-urlencoded";
myRequest.ContentLength = data.Length;
Stream newStream=myRequest.GetRequestStream();
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// Send the data.
newStream.Write(data,0,data.Length);
newStream.Close();
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// Get response
HttpWebResponse myResponse=(HttpWebResponse)myRequest.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(),Encoding.Default);
string content = reader.ReadToEnd();
Response.Write(content);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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原文地址:https://www.cnblogs.com/wubiyu/p/812673.html
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