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C#使用HttpWebRequest与HttpWebResponse模拟用户登录

2019年07月18日  | 移动技术网IT编程  | 我要评论

模拟艺龙旅游网登录，供大家参考，具体内容如下

想模拟登录，首先整理一下流程

1.通过360浏览器(ie,火狐等等)f12开发人员工具抓到相关数据

2.获取验证码（拿到cookie），登录时也需要使用

3.登录

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

*****************************************************************

我使用c# 设计的winform界面

复制代码

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
    }
  }
}

最后执行效果，登录的session已经成功返回。

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