在Winform中如何向http目标地址以post的方式提交请求，并抓取页面输出内容呢？

Question

如题。100送上。

Answer 1

System.Text.Encoding encode = System.Text.Encoding.GetEncoding("GB2312");
tmpurl="请求URL信息";
System.Net.WebClient wc=new WebClient();
System.IO.StreamReader sr=new System.IO.StreamReader( wc.OpenRead(tmpurl),encode);
tmpurl="";
tmpurl=sr.ReadToEnd();
tmpurl即取得返回所有信息

Answer 2

using System.Net;
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://abc.com.cn/xyz.aspx");
            //构造要post的数据
            ASCIIEncoding encoding=new ASCIIEncoding();
            string postdata="a=xxx&b=xxx";
            byte[] byte1=encoding.GetBytes(postdata);
            //Post
            req.Method = "POST";
            req.ContentType="application/x-www-form-urlencoded";
            req.ContentLength=postdata.Length;
            Stream s=req.GetRequestStream();
            s.Write(byte1,0,byte1.Length);
            s.Close();
            //获取响应
            HttpWebResponse rp= (HttpWebResponse)req.GetResponse();
            Stream rps= rp.GetResponseStream();
            StreamReader sr= new StreamReader(rps);
            //获得响应字符串
            string result = sr.ReadToEnd();
            rp.Close();

Answer 3

public static void PostDate()
{
//建立登录检查地址
string url = @"http://howaa.baoyaa.com/smslt.asp";
//建立request对象
System.Net.HttpWebRequest req=(System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url); 
//这个新建的Cookie集合不知道有什么用？？
//req.CookieContainer =new CookieContainer ();
   
req.Method="POST";//POST方式请求
req.ContentType= "application/x-www-form-urlencoded";//内容类型
         
    
//参数经过URL编码
string paraUrlCoded;
paraUrlCoded=System.Web.HttpUtility.UrlEncode("MobilePhone") +"="+System.Web.HttpUtility.UrlEncode("13564250347");
// paraUrlCoded+="&"; 
// paraUrlCoded+=System.Web.HttpUtility.UrlEncode("passwd")+"="+System.Web.HttpUtility.UrlEncode("999999");     //将URL编码后的字符串转化为字节
try
{
byte[] payload;
payload=System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
req.ContentLength=payload.Length; //设置请求的ContentLength 
System.IO.Stream writer=req.GetRequestStream();//获得请求流 
writer.Write(payload,0,payload.Length);//将请求参数写入流
writer.Close();//关闭请求流
}
catch
{} //获得响应流
}

Answer 4

#region get数据类GetDate
/// <summary>
/// Get数据类
/// </summary>
public class GetDate
{
private string sPostUrl;
/// <summary>
/// 提交地址
/// </summary>
public string postUrl
{
get
{
return sPostUrl;
}
set
{
sPostUrl=value;
}
}
private CookieContainer sSessionId;
/// <summary>
/// Cookies标志
/// </summary>
public CookieContainer SessionId
{
get
{
return sSessionId;
}
set
{
sSessionId=value;
}
}
private string sReturnString;
/// <summary>
/// 返回字符串
/// </summary>
/// <returns></returns>
public string ReturnString
{
get
{
return sReturnString;
}
set
{
sReturnString=value;
}
} public void Send()
{
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(sPostUrl);
request.CookieContainer=sSessionId;
request.Method="get";
//request.Timeout=2240;
HttpWebResponse response = (HttpWebResponse) request.GetResponse(); 
byte[] buf = new byte[1024]; 
int count=0;
while(true)
{
//resStream.Write(byte1,0,byte1.Length);
count = response.GetResponseStream().Read(buf, 0, buf.Length); 
if (count<=0)
{
break;
}
sReturnString+=Encoding.Unicode.GetString(buf,0,count); 
}
}
} #endregion

Answer 5

//这个新建的Cookie集合不知道有什么用？？
//req.CookieContainer =new CookieContainer ();
=================================================
如果需要在请求之间保存Session状态，就有用了