Http GetPost网络请求

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;

namespace ZhuoHuiSchoolRoom.ZhuoHuiClass
{
    class HttpWebResponseUtility
    {
        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";

        /// <summary>
        /// 创建GET方式的HTTP请求
        /// </summary>
        /// <param name="url">请求的URL</param>
        /// <param name="timeout">请求的超时时间</param>
        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>
        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>
        /// <returns></returns>
        public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            request.Method = "GET";
            request.UserAgent = DefaultUserAgent;
            if (!string.IsNullOrEmpty(userAgent))
            {
                request.UserAgent = userAgent;
            }
            if (timeout.HasValue)
            {
                request.Timeout = timeout.Value;
            }
            if (cookies != null)
            {
                request.CookieContainer = new CookieContainer();
                request.CookieContainer.Add(cookies);
            }
            return request.GetResponse() as HttpWebResponse;
        }

        /// <summary>
        /// 创建POST方式的HTTP请求
        /// </summary>
        /// <param name="url">请求的URL</param>
        /// <param name="str">json字符串</param>
        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>
        /// <returns></returns>
        public static HttpWebResponse CreatePostHttpResponse(string url, string str, Encoding requestEncoding)
        {
            if (string.IsNullOrEmpty(url))
            {
                throw new ArgumentNullException("url");
            }
            if (requestEncoding == null)
            {
                throw new ArgumentNullException("requestEncoding");
            }
            HttpWebRequest request = null;
            request = WebRequest.Create(url) as HttpWebRequest;

            request.Method = "POST";
            request.ContentType = "application/json;charset=utf-8";
            request.UserAgent = DefaultUserAgent;

            byte[] data = requestEncoding.GetBytes(str.ToString()); //将json转为二进制流
            using (Stream stream = request.GetRequestStream())
            {
                stream.Write(data, , data.Length);
            }

            return request.GetResponse() as HttpWebResponse;
        }

        /// <summary>
        /// 创建DELETE方式的HTTP请求
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <returns></returns>
        public static HttpWebResponse CreateDeleteHttpResponse(string url)
        {
            HttpWebRequest request = null;
            string urlPath = url;
            int millisecond = ;
            request = (HttpWebRequest)WebRequest.Create(urlPath);
            //request.Proxy = null;//关闭代理（重要）
            request.Timeout = millisecond;
            request.Method = "DELETE";
            //request.Accept = "application/json";
            //request.ContentType = "application/json";
            request.ServicePoint.Expect100Continue = false;
            return request.GetResponse() as HttpWebResponse;
        }

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true; //总是接受
        }

        /// <summary>
        /// HttpPost上传多个文件
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="pathList">路径集合</param>
        /// <returns></returns>
        public static HttpWebResponse HttpUploadFile(string url, List<string> pathList)
        {
            // 设置参数
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            CookieContainer cookieContainer = new CookieContainer();
            request.CookieContainer = cookieContainer;
            request.AllowAutoRedirect = true;
            request.Method = "POST";
            string boundary = "----" + DateTime.Now.Ticks.ToString("x"); // 随机分隔线
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;

            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");

            Stream postStream = request.GetRequestStream();
            for (int i = ; i < pathList.Count; i++)
            {
                int pos = pathList[i].LastIndexOf("\\");
                string fileName = pathList[i].Substring(pos + ); //取文件名
                                                                  //请求头部信息
                StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));
                byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

                FileStream fs = new FileStream(pathList[i], FileMode.Open, FileAccess.Read);
                byte[] bArr = new byte[fs.Length];
                fs.Read(bArr, , bArr.Length);
                fs.Close();

                postStream.Write(itemBoundaryBytes, , itemBoundaryBytes.Length);
                postStream.Write(postHeaderBytes, , postHeaderBytes.Length);
                postStream.Write(bArr, , bArr.Length);

            }
            postStream.Write(endBoundaryBytes, , endBoundaryBytes.Length);
            postStream.Close();

            //发送请求并获取相应回应数据
            return request.GetResponse() as HttpWebResponse;
        }
    }
}