C#使用HttpWebRequest与HttpWebResponse模拟用户登录

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; //存储验证码cookie    #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;//获取验证码时候获取到的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}

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.IO;using HTTPHELPER;namespace WindowsFormsApplication8{  public partial class ELONG_LOGIN_FORM : Form  {    public ELONG_LOGIN_FORM()    {      InitializeComponent();    }    private void button1_Click(object sender, EventArgs e)    {            ELOGN_LOGIN elongLogin = new ELOGN_LOGIN();            var rmsg = elongLogin.requestM(txtuserName.Text,txtPassword.Text,txtVaildata.Text);      MessageBox.Show(rmsg);    }    private void ELONG_LOGIN_FORM_Load(object sender, EventArgs e)    {      ReflshPicImage();//更新验证码    }    //更新验证码    public void ReflshPicImage()    {      string codeUrl = "https://secure.elong.com/passport/getValidateCode";      ELOGN_LOGIN agent = new ELOGN_LOGIN();      Stream stmImage = agent.getCodeStream(codeUrl);      picValidate.Image = Image.FromStream(stmImage);    }    private void btnReValidate_Click(object sender, EventArgs e)    {      ReflshPicImage();//更新验证码    }    private void picValidate_Click(object sender, EventArgs e)    {      ReflshPicImage();//更新验证码    }  }}