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HttpWebRequest

2024-09-05 04:22:32   216人阅读

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


  byte[] data = http://www.mamicode.com/System.Text.Encoding.UTF8.GetBytes("data=http://www.mamicode.com/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 = http://www.mamicode.com/System.Text.Encoding.UTF8.GetBytes("data=http://www.mamicode.com/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 = http://www.mamicode.com/System.Text.Encoding.UTF8.GetBytes("data=http://www.mamicode.com/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 = "http://www.mamicode.com/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 = http://www.mamicode.com/new List() { data, request };
                request.BeginGetRequestStream(GetRequestStreamCallBack, saveData);//开始异步
            }
            catch
            {//异常处理
            }
        }
 
        private void GetRequestStreamCallBack(IAsyncResult ar)
        {
            List<object> saveData = http://www.mamicode.com/ar.AsyncState as List;//转换要传递的data，和Request对象
            string data = http://www.mamicode.com/saveData[0] as string;//要传递的数据
            byte[] byteData = http://www.mamicode.com/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();
        }
 
 
    }
}

HttpWebRequest


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