【.Net基础03】HttpWebRequest模拟浏览器登陆

【原理】

【代码】

private void button2_Click(object sender, EventArgs e)
        {
            string url =“请求的地址” 
            indata = “传入的数据&传入的数据”;
            string outdata = "";
            byte[] data = System.Text.Encoding.UTF8.GetBytes(indata);

            //新建一个HttpWebRequest 
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);

            //一定要设置ContentType
            myHttpWebRequest.ContentType = "application/x-www-form-urlencoded";
            myHttpWebRequest.ContentLength = data.Length;
            myHttpWebRequest.Method = "POST";

            //新建一个CookieContainer来存放Cookie集合 
            CookieContainer myCookieContainer = new CookieContainer();

            //设置HttpWebRequest的CookieContainer为刚才建立的那个myCookieContainer 
            myHttpWebRequest.CookieContainer = myCookieContainer;

            //把数据写入HttpWebRequest的Request流 
            Stream myRequestStream = myHttpWebRequest.GetRequestStream();
            myRequestStream.Write(data, 0, data.Length);
            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8"));

            //关闭打开对象 
            myRequestStream.Flush();
            myRequestStream.Close();

            //新建一个HttpWebResponse 
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

            //把数据从HttpWebResponse的Response流中读出 
            Stream myResponseStream = myHttpWebResponse.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            outdata = myStreamReader.ReadToEnd();

            //关闭打开的对象 
            myStreamReader.Close();
            myResponseStream.Close();

            //显示"登录" 
            //拿到了Cookie，再进行请求就能直接读取到登录后的内容了 
            myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);

            //刚才那个CookieContainer已经存有了Cookie,把它附加到HttpWebRequest中则能直接通过验证 
            myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();

            //读取登陆后的内容
            myResponseStream = myHttpWebResponse.GetResponseStream();
            myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            outdata = myStreamReader.ReadToEnd();

            //关闭打开的对象 
            myStreamReader.Close();
            myResponseStream.Close();

            Console.WriteLine(outdata);
            this.webBrowser1.DocumentText = outdata;
        }

【备注】

当Cookie被设置为HttpOnly时，此方法就无法获取Cookie了，关于HttpOnly的限制，下一篇文章将继续研究。