C#模拟http 发送post或get请求

C#模拟http 发送post或get请求

private            string            HttpPost(            string            Url,             string            postDataStr)           


                        {           


                        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);           


                        request.Method =             "POST"            ;           


                        request.ContentType =             "application/x-www-form-urlencoded"            ;           


                        request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);           


                        request.CookieContainer = cookie;           


                        Stream myRequestStream = request.GetRequestStream();           


                        StreamWriter myStreamWriter =             new            StreamWriter(myRequestStream, Encoding.GetEncoding(            "gb2312"            ));           


                        myStreamWriter.Write(postDataStr);           


                        myStreamWriter.Close();           


                        


                        HttpWebResponse response = (HttpWebResponse)request.GetResponse();           


                        


                        response.Cookies = cookie.GetCookies(response.ResponseUri);           


                        Stream myResponseStream = response.GetResponseStream();           


                        StreamReader myStreamReader =             new            StreamReader(myResponseStream, Encoding.GetEncoding(            "utf-8"            ));           


                        string            retString = myStreamReader.ReadToEnd();           


                        myStreamReader.Close();           


                        myResponseStream.Close();           


                        


                        return            retString;           


                        }           


                        


                        public            string            HttpGet(            string            Url,             string            postDataStr)           


                        {           


                        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr ==             ""            ?             ""            :             "?"            ) + postDataStr);           


                        request.Method =             "GET"            ;           


                        request.ContentType =             "text/html;charset=UTF-8"            ;           


                        


                        HttpWebResponse response = (HttpWebResponse)request.GetResponse();           


                        Stream myResponseStream = response.GetResponseStream();           


                        StreamReader myStreamReader =             new            StreamReader(myResponseStream, Encoding.GetEncoding(            "utf-8"            ));           


                        string            retString = myStreamReader.ReadToEnd();           


                        myStreamReader.Close();           


                        myResponseStream.Close();           


                        


                        return            retString;           


                        }

　　

在post的时候有时也用的到cookie，像登录163发邮件时候就需要发送cookie，所以在外部一个cookie属性随时保存 CookieContainer cookie = new CookieContainer();

！注意：有时候请求会重定向，但我们就需要从重定向url获取东西，像QQ登录成功后获取sid，但上面的会自动根据重定向地址跳转。我们可以用:
request.AllowAutoRedirect = false;设置重定向禁用，你就可以从headers的Location属性中获取重定向地址

C#模拟POST登录cnblogs并发布文章

用到的工具FireFox的Firebugs插件 打开网络功能进行抓包 数据如下

可以得知POST的数据为：

__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%2FwEPDwULLTE1MzYzODg2NzZkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcm1QYDyKKI9af4b67Mzq2xFaL9Bt&__EVENTVALIDATION=%2FwEWBQLWwpqPDQLyj%2FOQAgK3jsrkBALR55GJDgKC3IeGDE1m7t2mGlasoP1Hd9hLaFoI2G05&tbUserName=账户&tbPassword=密码&btnLogin=%E7%99%BB++%E5%BD%95&txtReturnUrl=http%3A%2F%2Fhome.cnblogs.com%2F

在VS里画登陆图

　

　查看别人的代码  登录代码：

s

tring postData =string.Format( "__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=/wEPDwULLTE1MzYzODg2NzZkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcm1QYDyKKI9af4b67Mzq2xFaL9Bt&__EVENTVALIDATION=/wEWBQLWwpqPDQLyj/OQAgK3jsrkBALR55GJDgKC3IeGDE1m7t2mGlasoP1Hd9hLaFoI2G05&tbUserName={0}&tbPassword={1}&btnLogin=登 录&txtReturnUrl=http://home.cnblogs.com/",txtName.Text.Trim(),txtPwd.Text.Trim());
 //这是cnblogs提交时的一些参数
 ASCIIEncoding encoding = new ASCIIEncoding();
 byte[] data = encoding.GetBytes(postData);
 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://passport.cnblogs.com/login.aspx");
 request.Method = "Post";
 request.ContentType = "application/x-www-form-urlencoded";
 request.ContentLength = data.Length;
 request.KeepAlive = true;
 request.CookieContainer = container; //返回的cookie会附加在这个容器里面
 //发送数据

 Stream newStream = request.GetRequestStream();
 newStream.Write(data, 0, data.Length);


 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 newStream = response.GetResponseStream();
 StreamReader reader = new StreamReader(newStream, Encoding.UTF8);
 string text = reader.ReadToEnd();
 reader.Close();
 newStream.Close();