2.获取验证码（拿到cookie），登录时也需要使用
3.登录
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F12调出开发人员工具，输入用户名，，密码登录，看我们抓到了什么信息。
Request URL:这个就是登录请求的url
https://secure.elong.com/passport/ajax/elongLogin
方式POST
Form Data:这个是我们要POST传输的数据：
userName=xzdylyh&passwd=12313&validateCode=验证码&rememberMe=false
其它一些重要信息在Request Headers中
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我使用C# 设计的winform界面
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Web; using System.Net; using System.IO; using System.Data; namespace HTTPHELPER { public class ELOGN_LOGIN { public static CookieContainer container = null; #region 登录 public string requestM(string uName,string passwd,string vaildate) { HttpWebRequest request = null; HttpWebResponse response = null; try { request = (HttpWebRequest)HttpWebRequest.Create("https://secure.elong.com/passport/ajax/elongLogin"); request.Method = "Post"; request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8"; request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36"; request.AllowAutoRedirect = true; request.CookieContainer = container;//返回的cookie会附加在这个容器里面 request.KeepAlive = true;//建立持久性连接 //整数据 string postData = string.Format("userName={0}&passwd={1}&validateCode={2}&rememberMe=true", uName, passwd, vaildate); ASCIIEncoding encoding = new ASCIIEncoding(); byte[] bytepostData = encoding.GetBytes(postData); request.ContentLength = bytepostData.Length; //发送数据 using结束代码段释放 using (Stream requestStm = request.GetRequestStream()) { requestStm.Write(bytepostData, 0, bytepostData.Length); } //响应 response = (HttpWebResponse)request.GetResponse(); string text = string.Empty; using (Stream responseStm = response.GetResponseStream()) { StreamReader redStm = new StreamReader(responseStm, Encoding.UTF8); text = redStm.ReadToEnd(); } return text; } catch (Exception ex) { var msg = ex.Message; return msg; } } #endregion #region 获取验证码 public Stream getCodeStream(string codeUrl) { //验证码请求 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(codeUrl); request.Method = "GET"; request.ContentType = "application/x-www-form-urlencoded"; request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1"; request.Accept = "image/webp,*/*;q=0.8"; request.CookieContainer = new CookieContainer();//!Very Important.!!! container = request.CookieContainer; var c = request.CookieContainer.GetCookies(request.RequestUri); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); response.Cookies = container.GetCookies(request.RequestUri); Stream stream = response.GetResponseStream(); return stream; } } #endregion }