【HTTP】模拟form提交表单（转）

 　 string postString = "arg1=a&arg2=b";//这里即为传递的参数，可以用工具抓包分析，也可以自己分析，主要是form里面每一个name都要加进来  
    byte[] postData = Encoding.UTF8.GetBytes(postString);//编码，尤其是汉字，事先要看下抓取网页的编码方式  
    string url = "http://localhost/register.php";//地址  
    WebClient webClient = new WebClient();  
    webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可  
    byte[] responseData = webClient.UploadData(url, "POST", postData);//得到返回字符流  
    string srcString = Encoding.UTF8.GetString(responseData);//解码  

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("POST请求的地址");  
    request.CookieContainer = new CookieContainer();  
    CookieContainer cookie = request.CookieContainer;//如果用不到Cookie，删去即可  
    //以下是发送的http头，随便加，其中referer挺重要的，有些网站会根据这个来反盗链  
    request.Referer = “http://localhost/index.php”;  
    request.Accept = "Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";  
    request.Headers["Accept-Language"] = "zh-CN,zh;q=0.";  
    request.Headers["Accept-Charset"] = "GBK,utf-8;q=0.7,*;q=0.3";  
    request.UserAgent = "User-Agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1";  
    request.KeepAlive = true;  
    //上面的http头看情况而定，但是下面俩必须加  
    request.ContentType = "application/x-www-form-urlencoded";  
    request.Method = "POST";  
      
    Encoding encoding = Encoding.UTF8;//根据网站的编码自定义  
    byte[] postData = encoding.GetBytes(postDataStr);//postDataStr即为发送的数据，格式还是和上次说的一样  
    request.ContentLength = postData.Length;  
    Stream requestStream = request.GetRequestStream();  
    requestStream.Write(postData, 0, postData.Length);  
      
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
    Stream responseStream = response.GetResponseStream();  
    //如果http头中接受gzip的话，这里就要判断是否为有压缩，有的话，直接解压缩即可  
    if (response.Headers["Content-Encoding"] != null && response.Headers["Content-Encoding"].ToLower().Contains("gzip"))  
    {  
        responseStream = new GZipStream(responseStream, CompressionMode.Decompress);  
    }  
      
    StreamReader streamReader = new StreamReader(responseStream, encoding);  
    string retString = streamReader.ReadToEnd();  
      
    streamReader.Close();  
    responseStream.Close();  
      
    return retString;