HttpWebRequest的简单使用

Posted 2020-07-09 叶丶梓轩

新建新的空网站和一个default.aspx页面测试，实验例子：

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;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        HttpWebRequest web = (HttpWebRequest)WebRequest.Create("http://www.cnblogs.com/");  //创建一个请求
        web.Method = "GET";                                               //方式为get
        web.ContentType = "text/html;charset=UTF-8";                     //定义获取数据的类型
        HttpWebResponse response = (HttpWebResponse)web.GetResponse();   //获取响应
        string result = "";
        using (Stream stream = response.GetResponseStream())               //定义缓存，将数据读取出来
        {
            StreamReader sr = new StreamReader(stream);
            result = sr.ReadToEnd();
        }
        Label1.Text = result.ToString();

    }
}

 二，客户端带参和带文件流的请求方法

        #region HTTP请求
        /// <summary>
        /// HTTP请求接口
        /// </summary>
        /// <param name="UploadFile"></param>
        /// <returns></returns>
        public ActionResult HZRequest2(HttpPostedFileBase UploadFile)
        {
            string key = "PKWodTrwuTXoMvRUZhUgyf";
            string url = "http://localhost:5832/Home/HZDistinguish?key=" + key + "";
            byte[] byt = new byte[UploadFile.InputStream.Length];
            UploadFile.InputStream.Read(byt, 0, (int)UploadFile.InputStream.Length);
            //初始化新的webRequst
            //1． 创建httpWebRequest对象
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            //2． 初始化HttpWebRequest对象
            webRequest.Method = "POST";
            webRequest.ContentType = "multipart/form-data";
            webRequest.ContentLength = byt.Length;
            //3． 附加要POST给服务器的数据到HttpWebRequest对象(附加POST数据的过程比较特殊，它并没有提供一个属性给用户存取，需要写入HttpWebRequest对象提供的一个stream里面。)
            Stream newStream = webRequest.GetRequestStream();//创建一个Stream,赋值是写入HttpWebRequest对象提供的一个stream里面

            newStream.Write(byt, 0, byt.Length);
            newStream.Close();
            //4． 读取服务器的返回信息
            HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
            StreamReader stmRead = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string reapond = stmRead.ReadToEnd();
            response.Close();
            stmRead.Close();
            return Content(reapond);
        }
        #endregion

 

 

服务器接收方法：

        public ActionResult HZDistinguish()
        {
            int lang = Request.TotalBytes;
            byte[] bytes = Request.BinaryRead(lang);

            Stream stream = Request.InputStream;
            string key = Request["key"];
        }    

 三，Post带参数的方法

        public static string Post(string url, Dictionary<string, object> dic)
        {
            StringBuilder str = new StringBuilder();
            foreach (KeyValuePair<string, object> kv in dic)
            {
                string pkey = kv.Key;
                object pvalue = kv.Value;
                str.Append("&" + pkey + "=" + pvalue);
            }
            var data = Encoding.ASCII.GetBytes(str.ToString());

            //初始化新的webRequst
            //1． 创建httpWebRequest对象
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            //2． 初始化HttpWebRequest对象
            webRequest.Method = "Post";
            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ContentLength = data.Length;

            using (var stream = webRequest.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
            //4． 读取服务器的返回信息
            HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();

            StreamReader stmRead = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string result = stmRead.ReadToEnd();
            response.Close();
            stmRead.Close();
            return result;
        }