HttpWebRequest

Posted 2020-08-31

 同步请求=====================================================================================

  byte[] data = System.Text.Encoding.UTF8.GetBytes("data=Hello,World~");//组建要提交的数据

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:8077/Index.aspx");

            //请求报文的参数设置

            request.Method = "post";

            request.ContentType = "application/x-www-form-urlencoded";//post请求的时候，必须加上这行代码，不然数据无法提交到目标url

 

            using (Stream requestStream = request.GetRequestStream())//请求流；有数据需要传递给目标url时候，需要把数据放在此流中

            {

                requestStream.Write(data, 0, data.Length);

            }//get类型的请求，不能有【请求流】get请求如果有参数，把参数 拼接到 url中 .create()

 

 

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream();//返回流

            StreamReader sr = new StreamReader(responseStream,Encoding.UTF8);

            string result = sr.ReadToEnd();//读取流,得到String



【从服务器获取cookie】
      byte[] data = System.Text.Encoding.UTF8.GetBytes("data=Hello,World~");//组建要提交的数据

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:8077/Index.aspx");

            //请求报文的参数设置

            request.Method = "post";

            request.ContentType = "application/x-www-form-urlencoded";//post请求的时候，必须加上这行代码，不然数据无法提交到目标url

            request.CookieContainer = new CookieContainer();//请求地址，获取cookie 如 登录时的cookie

 

            using (Stream requestStream = request.GetRequestStream())//请求流；有数据需要传递给目标url时候，需要把数据放在此流中

            {

                requestStream.Write(data, 0, data.Length);

            }

 

 

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream();//返回流

            StreamReader sr = new StreamReader(responseStream,Encoding.UTF8);

            string result = sr.ReadToEnd();//读取流,得到String

 

            Cookie ck = response.Cookies[0];

            if (ck!=null)

            {

                Response.Write(ck.Value); 

            }

            

 

【组建cookie提交个服务器】

 byte[] data = System.Text.Encoding.UTF8.GetBytes("data=Hello,World~");//组建要提交的数据

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:8077/Index.aspx");

            //请求报文的参数设置

            request.Method = "post";

            request.ContentType = "application/x-www-form-urlencoded";//post请求的时候，必须加上这行代码，不然数据无法提交到目标url

            request.CookieContainer = new CookieContainer();//使用cookie就需要加上此行代码

            Cookie c = new Cookie("name","zs");

            c.Domain = "localhost";//不能就加http  和端口号 只能放域名

            request.CookieContainer.Add(c);

 

            using (Stream requestStream = request.GetRequestStream())//请求流；有数据需要传递给目标url时候，需要把数据放在此流中

            {

                requestStream.Write(data, 0, data.Length);

            }

 

 

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream();//返回流

            StreamReader sr = new StreamReader(responseStream,Encoding.UTF8);

            string result = sr.ReadToEnd();//读取流,得到String

 

异步请求======================================================================================

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

 

namespace AsynHttpWebRequest

{

    public partial class Index : System.Web.UI.Page

    {

        public string TestStr;

        protected void Page_Load(object sender, EventArgs e)

        {

            DoAsynVisist();

            TestStr = "外";

        }

 

        private void DoAsynVisist()

        {

            string data = "data=Hello World~";//模拟要传递的数据

            try

            {

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://localhost:8044/Index.aspx");

                request.Method = "post";

                request.ContentType = "application/x-www-form-urlencoded";//post请求的时候，必须加上这行代码，不然数据无法提交到目标url

                List<object> saveData = new List<object>() { data, request };

                request.BeginGetRequestStream(GetRequestStreamCallBack, saveData);//开始异步

            }

            catch

            {//异常处理

            }

        }

 

        private void GetRequestStreamCallBack(IAsyncResult ar)

        {

            List<object> saveData = ar.AsyncState as List<object>;//转换要传递的data，和Request对象

            string data = saveData[0] as string;//要传递的数据

            byte[] byteData = System.Text.Encoding.UTF8.GetBytes(data);

            HttpWebRequest request = (HttpWebRequest)saveData[1];

 

            Stream requestStream = request.EndGetRequestStream(ar);//请求流

            requestStream.Write(byteData, 0, byteData.Length);

            requestStream.Close();

 

            request.BeginGetResponse(GetResponseCallBack,request);//一旦使用异步处理，所有的操作方法都要配套，像这里使用BeginGetResponse而不是直接GetResponse

        }

 

        private void GetResponseCallBack(IAsyncResult ar)

        {

            HttpWebRequest request = ar.AsyncState as HttpWebRequest;

            HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(ar);

 

            Stream streamResponse = response.GetResponseStream();//返回流

            StreamReader streamRead = new StreamReader(streamResponse);

            string responseString = streamRead.ReadToEnd();//得到结果

//模拟处理 

            string filePath = AppDomain.CurrentDomain.BaseDirectory + "/Result";//System.Web.HttpContext.Current.Server.MapPath("/Result"); //HttpContext.Current.Request.MapPath("/Result");//异步这里为null

           TestStr = "内";

           File.WriteAllText(filePath + "\\" + "1.txt", responseString + TestStr);
 

            streamResponse.Close();

            streamRead.Close();

            response.Close();

        }

 

 

    }

}