C#---HttpWebRequest+HttpWebResponse实现登录人人网

1.Form做成这样：

2.添加新建项HttpHelper.cs

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace XIN_001
{
    class HttpHelper
    {
        private static string accept = "*/*";
        private static CookieContainer cc = new CookieContainer();
        private static string contentType = "application/x-www-form-urlencoded";
        private static Encoding encoding = Encoding.GetEncoding("utf-8");
        private static string userAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E)";

        public static string GetHtml(string url, CookieContainer cookieContainer, string referer, string postData, bool isPost)
        {
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            try
            {
                request = (HttpWebRequest)WebRequest.Create(url);
                request.CookieContainer = cookieContainer;
                request.ContentType = contentType;
                if (!string.IsNullOrEmpty(referer))
                    request.Referer = referer;
                else
                    request.Referer = url;
                request.Accept = accept;
                request.UserAgent = userAgent;
                request.Method = isPost ? "POST" : "GET";
                if (!string.IsNullOrEmpty(postData))
                {
                    byte[] bytes = Encoding.Default.GetBytes(postData);
                    request.ContentLength = bytes.Length;
                    Stream requestStream = request.GetRequestStream();
                    requestStream.Write(bytes, 0, bytes.Length);
                    requestStream.Close();
                }
                response = (HttpWebResponse)request.GetResponse();
                Stream responseStream = response.GetResponseStream();
                StreamReader reader = new StreamReader(responseStream, encoding);
                string str = reader.ReadToEnd();
                reader.Close();
                responseStream.Close();
                response.Close();
                return str;
            }
            catch(Exception Ex)
            {
                MessageBox.Show(Ex.Message.ToString());
                throw Ex;
            }
        }
        public static string GetHtml(string url)
        {
            return GetHtml(url, cc, null, null, false);
        }
        public static string GetHtml(string url,string postData,bool isPost)
        {
            return GetHtml(url, cc, null, postData, isPost);
        }
        public static string GetHtml(string url, string referer)
        {
            return GetHtml(url, cc, referer, null, false);
        }
        public static void Delay()
        {
            Random ran = new Random();
            int ranKey = ran.Next(100, 900);
            Thread.Sleep(ranKey);
        }
    }
}

3.Form代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using XIN_001;
using System.IO;

namespace LoginRenren
{
    public partial class FrmLoginRenren : Form
    {
        public FrmLoginRenren()
        {
            InitializeComponent();
        }
        private static string html = "";
        private static string url = "http://www.renren.com/PLogin.do";
        private void btnLogin_Click(object sender, EventArgs e)
        {
            string postData = "email=" + txtUserName.Text + "&icode=&origURL=http%3A%2F%2Fwww.renren.com%2Fhome&domain=renren.com&key_id=1&captcha_type=web_login&password=" + txtPwd.Text;
            html = HttpHelper.GetHtml(url, postData, true);
            LogFile("D:\LoginRenren.txt", html);
        }
        private bool LogFile(string LogFileName, string LogText)
        {
            if (File.Exists(LogFileName))
            {
                StreamWriter LogStreamWriter = new StreamWriter(LogFileName, true, Encoding.Default);
                LogStreamWriter.WriteLine(LogText);
                LogStreamWriter.Close();
                return true;
            }
            else
            {
                try
                {
                    FileStream LogFileStream = new FileStream(LogFileName, FileMode.CreateNew);
                    LogFileStream.Close();
                    StreamWriter LogStreamWriter = new StreamWriter(LogFileName, true, Encoding.Default);
                    LogStreamWriter.WriteLine(LogText);
                    LogStreamWriter.Close();
                    return true;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message.ToString());
                    return false;
                }
            }
        }
    }
}

如果成功登录人人网，本程序将在D盘根目录下生成一个LoginRenren.txt文件，里面是登录成功后的好友新鲜事页面的源文件。

附登录人人网源代码【VS2010解决方案】：LoginRenren.rar