C#中HttpWebRequest的用法详解

原文地址：https://blog.csdn.net/zhruifei/article/details/78356347

1、HttpWebRequest和HttpWebResponse类是用于发送和接收HTTP数据的最好选择。

2、命名空间：System.Net

3、HttpWebRequest对象不是利用new关键字创建的（通过构造函数）。
而是利用Create()方法创建的。

4、你可能预计需要显示地调用一个“Send”方法，实际上不需要。

5、调用 HttpWebRequest.GetResponse()方法返回的是一个HttpWebResponse对象

6、你可以把HTTP响应的数据流（stream）绑定到一个StreamReader对象，然后就可以通过ReadToEnd()方法把整个HTTP响应作为一个字符串取回。也可以通过 StreamReader.ReadLine()方法逐行取回HTTP响应的内容。

下面是HttpWebRequest的一些属性，这些属性对于轻量级的自动化测试程序是非常重要的。

a） AllowAutoRedirect：获取或设置一个值，该值指示请求是否应跟随重定向响应。
b）CookieContainer：获取或设置与此请求关联的cookie。
c）Credentials：获取或设置请求的身份验证信息。
d）KeepAlive：获取或设置一个值，该值指示是否与 Internet 资源建立持久性连接。
e）MaximumAutomaticRedirections：获取或设置请求将跟随的重定向的最大数目。
f） Proxy：获取或设置请求的代理信息。
g）SendChunked：获取或设置一个值，该值指示是否将数据分段发送到 Internet 资源。
h）Timeout：获取或设置请求的超时值。
i） UserAgent：获取或设置 User-agent HTTP 标头的值

C# HttpWebRequest提交数据方式其实就是GET和POST两种

C# HttpWebRequest的作用：
HttpWebRequest对HTTP协议进行了完整的封装，对HTTP协议中的 Header, Content, Cookie 都做了属性和方法的支持，很容易就能编写出一个模拟浏览器自动登录的程序。

C# HttpWebRequest提交数据方式：
程序使用HTTP协议和服务器交互主要是进行数据的提交，通常数据的提交是通过 GET 和 POST 两种方式来完成，

C# HttpWebRequest提交数据方式

1. GET 方式。
GET 方式通过在网络地址附加参数来完成数据的提交，比如在地址 http://www.google.com/webhp?hl=zh-CN 中，前面部分 http://www.google.com/webhp 表示数据提交的网址，后面部分 hl=zh-CN 表示附加的参数，其中 hl 表示一个键(key)， zh-CN 表示这个键对应的值(value)。程序代码如下：

HttpWebRequest req =  
(HttpWebRequest)HttpWebRequest.Create("http://www.google.com/webhp?hl=zh-CN" ); 
req.Method = "GET"; 
using (WebResponse wr = req.GetResponse()) 
{ 
   //在这里对接收到的页面内容进行处理 
}

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2. POST 方式。

POST 方式通过在页面内容中填写参数的方法来完成数据的提交，参数的格式和 GET 方式一样，是类似于 hl=zh-CN&newwindow=1 这样的结构。程序代码如下：

string param = "hl=zh-CN&newwindow=1";        //参数
byte[] bs = Encoding.ASCII.GetBytes(param);    //参数转化为ascii码
HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create("http://www.google.com/intl/zh-CN/" );  //创建request
req.Method = "POST";    //确定传值的方式，此处为post方式传值
req.ContentType = "application/x-www-form-urlencoded"; 
req.ContentLength = bs.Length; 
using (Stream reqStream = req.GetRequestStream()) 
{ 
   reqStream.Write(bs, 0, bs.Length); 
} 
using (WebResponse wr = req.GetResponse()) 
{ 
   //在这里对接收到的页面内容进行处理 
}

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3. 使用 GET 方式提交中文数据。

GET 方式通过在网络地址中附加参数来完成数据提交，对于中文的编码，常用的有 gb2312 和 utf8 两种，用 gb2312 方式编码访问的程序代码如下：

Encoding myEncoding = Encoding.GetEncoding("gb2312");     //确定用哪种中文编码方式
string address = "http://www.baidu.com/s?"+ HttpUtility.UrlEncode("参数一", myEncoding) +  "=" + HttpUtility.UrlEncode("值一", myEncoding);       //拼接数据提交的网址和经过中文编码后的中文参数
HttpWebRequest req =   (HttpWebRequest)HttpWebRequest.Create(address);  //创建request
req.Method = "GET";    //确定传值方式，此处为get方式
using (WebResponse wr = req.GetResponse()) 
{ 
   //在这里对接收到的页面内容进行处理 
}

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在上面的程序代码中，我们以 GET 方式访问了网址 http://www.baidu.com/s ，传递了参数“参数一=值一”，由于无法告知对方提交数据的编码类型，所以编码方式要以对方的网站为标准。常见的网站中， www.baidu.com （百度）的编码方式是 gb2312, www.google.com （谷歌）的编码方式是 utf8。

4. 使用 POST 方式提交中文数据。

POST 方式通过在页面内容中填写参数的方法来完成数据的提交，由于提交的参数中可以说明使用的编码方式，所以理论上能获得更大的兼容性。用 gb2312 方式编码访问的程序代码如下：

Encoding myEncoding = Encoding.GetEncoding("gb2312");  //确定中文编码方式。此处用gb2312
string param =   HttpUtility.UrlEncode("参数一", myEncoding) +   "=" + HttpUtility.UrlEncode("值一", myEncoding) +   "&" +     HttpUtility.UrlEncode("参数二", myEncoding) +  "=" + HttpUtility.UrlEncode("值二", myEncoding); 
byte[] postBytes = Encoding.ASCII.GetBytes(param);     //将参数转化为assic码
HttpWebRequest req = (HttpWebRequest)  HttpWebRequest.Create( "http://www.baidu.com/s" ); 
req.Method = "POST"; 
req.ContentType =   "application/x-www-form-urlencoded;charset=gb2312"; 
req.ContentLength = postBytes.Length; 
using (Stream reqStream = req.GetRequestStream()) 
{ 
   reqStream.Write(bs, 0, bs.Length); 
} 
using (WebResponse wr = req.GetResponse()) 
{ 
   //在这里对接收到的页面内容进行处理 
}

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从上面的代码可以看出， POST 中文数据的时候，先使用 UrlEncode 方法将中文字符转换为编码后的 ASCII 码，然后提交到服务器，提交的时候可以说明编码的方式，用来使对方服务器能够正确的解析。

以上列出了客户端程序使用HTTP协议与服务器交互的情况，常用的是 GET 和 POST 方式。

现在流行的 WebService 也是通过 HTTP 协议来交互的，使用的是 POST 方法。与以上稍有所不同的是， WebService 提交的数据内容和接收到的数据内容都是使用了 XML 方式编码。所以， HttpWebRequest 也可以使用在调用 WebService 的情况下。

C# HttpWebRequest提交数据方式的基本内容就向你介绍到这里，希望对你了解和学习C# HttpWebRequest提交数据方式有所帮助。

    #region 公共方法
    /// <summary>
    /// Get数据接口
    /// </summary>
    /// <param name="getUrl">接口地址</param>
    /// <returns></returns>
    private static string GetWebRequest(string getUrl)
    {
        string responseContent = "";

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(getUrl);
        request.ContentType = "application/json";
        request.Method = "GET";

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        //在这里对接收到的页面内容进行处理
        using (Stream resStream = response.GetResponseStream())
        {
            using (StreamReader reader = new StreamReader(resStream, Encoding.UTF8))
            {
                responseContent = reader.ReadToEnd().ToString();
            }
        }
        return responseContent;
    }
    /// <summary>
    /// Post数据接口
    /// </summary>
    /// <param name="postUrl">接口地址</param>
    /// <param name="paramData">提交json数据</param>
    /// <param name="dataEncode">编码方式(Encoding.UTF8)</param>
    /// <returns></returns>
    private static string PostWebRequest(string postUrl, string paramData, Encoding dataEncode)
    {
        string responseContent = string.Empty;
        try
        {
            byte[] byteArray = dataEncode.GetBytes(paramData); //转化
            HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(new Uri(postUrl));
            webReq.Method = "POST";
            webReq.ContentType = "application/x-www-form-urlencoded";
            webReq.ContentLength = byteArray.Length;
            using (Stream reqStream = webReq.GetRequestStream())
            {
                reqStream.Write(byteArray, 0, byteArray.Length);//写入参数
                                                                //reqStream.Close();
            }
            using (HttpWebResponse response = (HttpWebResponse)webReq.GetResponse())
            {
                //在这里对接收到的页面内容进行处理
                using (StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.Default))
                {
                    responseContent = sr.ReadToEnd().ToString();
                }
            }
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
        return responseContent;
    }

    #endregion

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OAuth头部

//构造OAuth头部 
StringBuilder oauthHeader = new StringBuilder();
oauthHeader.AppendFormat("OAuth realm=\"\", oauth_consumer_key={0}, ", apiKey);
oauthHeader.AppendFormat("oauth_nonce={0}, ", nonce);
oauthHeader.AppendFormat("oauth_timestamp={0}, ", timeStamp);
oauthHeader.AppendFormat("oauth_signature_method={0}, ", "HMAC-SHA1");
oauthHeader.AppendFormat("oauth_version={0}, ", "1.0");
oauthHeader.AppendFormat("oauth_signature={0}, ", sig);
oauthHeader.AppendFormat("oauth_token={0}", accessToken);

//构造请求 
StringBuilder requestBody = new StringBuilder("");
Encoding encoding = Encoding.GetEncoding("utf-8");
byte[] data = encoding.GetBytes(requestBody.ToString());

// Http Request的设置 
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.Headers.Set("Authorization", oauthHeader.ToString());
//request.Headers.Add("Authorization", authorization); 
request.ContentType = "application/atom+xml";
request.Method = "GET";

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C#通过WebClient/HttpWebRequest实现http的post/get方法

1.POST方法(httpWebRequest)

//body是要传递的参数,格式"roleId=1&uid=2"
//post的cotentType填写:"application/x-www-form-urlencoded"
//soap填写:"text/xml; charset=utf-8"
public static string PostHttp(string url, string body, string contentType)
{
    HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

    httpWebRequest.ContentType = contentType;
    httpWebRequest.Method = "POST";
    httpWebRequest.Timeout = 20000;

    byte[] btBodys = Encoding.UTF8.GetBytes(body);
    httpWebRequest.ContentLength = btBodys.Length;
    httpWebRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);

    HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
    StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
    string responseContent = streamReader.ReadToEnd();

    httpWebResponse.Close();
    streamReader.Close();
    httpWebRequest.Abort();
    httpWebResponse.Close();

    return responseContent;
}

    /// <summary>
    /// 用于外部接口调用封装
    /// </summary>
    public static class ApiInterface
    {

        /// <summary>
        ///验证密码是否正确
        /// </summary>
        public static Api_ToConfig<object> checkPwd(int userId, string old)
        {
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/checkPwd";
            var data = Json.ToObject<Api_ToConfig<object>>(CallWebRequest.Post(url + "?id=" + userId, "&oldPwd=" + old));
            //var data = Json.ToObject<Api_ToConfig<object>>(CallWebRequest.Post(url, "{\"id\":" + userId + ",oldPwd:\"" + old + "\",newPwd:\"" + pwd + "\"}"));
            return data;
        }

        /// <summary>
        ///
        /// </summary>
        public static Api_ToConfig<object> UpdatePassword(int userId, string pwd, string old)
        {
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/updatePwd";
            var data = Json.ToObject<Api_ToConfig<object>>(CallWebRequest.Post(url + "?id=" + userId + "&oldPwd=" + old, "&newPwd=" + pwd));
            //var data = Json.ToObject<Api_ToConfig<object>>(CallWebRequest.Post(url, "{\"id\":" + userId + ",oldPwd:\"" + old + "\",newPwd:\"" + pwd + "\"}"));
            return data;
        }




        private static DateTime GetTime(string timeStamp)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000");
            TimeSpan toNow = new TimeSpan(lTime); return dtStart.Add(toNow);
        }


        #region 公共方法

        /// <summary>
        /// 配置文件key
        /// </summary>
        /// <param name="key"></param>
        /// <param name="isOutKey"></param>
        /// <returns></returns>
        public static string GetConfig(string key, bool isOutKey = false)
        {
            //  CacheRedis.Cache.RemoveObject(RedisKey.ConfigList);
            var data = CacheRedis.Cache.Get<Api_BaseToConfig<Api_Config>>(RedisKey.ConfigList);

            //  var data = new Api_BaseToConfig<Api_Config>();
            if (data == null)
            {
                string dataCenterUrl = WebConfigManager.GetAppSettings("DataCenterUrl");
                string configurationInfoListByFilter = WebConfigManager.GetAppSettings("ConfigurationInfoListByFilter");

                string systemCoding = WebConfigManager.GetAppSettings("SystemCoding");
                string nodeIdentifier = WebConfigManager.GetAppSettings("NodeIdentifier");
                string para = "systemIdf=" + systemCoding + "&nodeIdf=" + nodeIdentifier + "";
                //string para = "{\"systemIdf\":\"" + systemCoding + "\",\"nodeIdf\":\"" + nodeIdentifier + "\"}";

                string result = CallWebRequest.Post(dataCenterUrl + "/rest" + configurationInfoListByFilter, para);
                data =
                    Json.ToObject<Api_BaseToConfig<Api_Config>>(result);
                CacheRedis.Cache.Set(RedisKey.ConfigList, data);
            }
            if (data.Status)
            {
                if (isOutKey && ConfigServer.IsOutside())
                {
                    key += "_outside";
                }
                key = key.ToLower();
                var firstOrDefault = data.Data.FirstOrDefault(e => e.Identifier.ToLower() == key);
                if (firstOrDefault != null)
                {
                    return firstOrDefault.Value;
                }
                else
                {
                    if (key.IndexOf("_outside") > -1)
                    {
                        firstOrDefault = data.Data.FirstOrDefault(e => e.Identifier == key.Substring(0, key.LastIndexOf("_outside")));
                        if (firstOrDefault != null)
                            return firstOrDefault.Value;
                    }
                }
            }
            return "";
        }

        public static string WebPostRequest(string url, string postData)
        {
            return CallWebRequest.Post(url, postData);
        }
        public static string WebGetRequest(string url)
        {
            return CallWebRequest.Get(url);
        }

        #endregion


        #region 参数转换方法
        private static string ConvertClassIds(string classIds)
        {
            var list = classIds.Split(',');
            StringBuilder sb = new StringBuilder("{\"class_id_list\": [");
            foreach (var s in list)
            {
                sb.Append("{\"classId\": \"" + s + "\"},");
            }
            if (list.Any())
                sb.Remove(sb.Length - 1, 1);

            sb.Append("]}");

            return sb.ToString();
        }

        private static string ConvertLabIds(string labIds)
        {
            var list = labIds.Split(',');
            StringBuilder sb = new StringBuilder("{\"lab_id_list\": [");
            foreach (var s in list)
            {
                sb.Append("{\"labId\": \"" + s + "\"},");
            }
            if (list.Any())
                sb.Remove(sb.Length - 1, 1);

            sb.Append("]}");

            return sb.ToString();
        }

        private static string ConvertCardNos(string cardNos)
        {
            var list = cardNos.Split(',');
            StringBuilder sb = new StringBuilder("{\"student_cardNos_list\": [");
            foreach (var s in list)
            {
                sb.Append("{\"stuCardNo\": \"" + s + "\"},");
            }
            if (list.Any())
                sb.Remove(sb.Length - 1, 1);

            sb.Append("]}");

            return sb.ToString();
        }
        #endregion



        /// <summary>
        /// 设置公文已读
        /// </summary>
        /// <param name="beginTime"></param>
        /// <param name="endTime"></param>
        /// <param name="userId"></param>
        /// <param name="currentPage"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        public static Api_ToConfig<object> FlowService(string id)
        {
            var url = WebConfigManager.GetAppSettings("FlowService");
            var data = Json.ToObject<Api_ToConfig<object>>(CallWebRequest.Post(url + "?Copyid=" + id, ""));
            return data;
        }


        /// <summary>
        ///获取OA工作流数据
        /// </summary>
        public static string getOAWorkFlowData(string userName, string userId)
        {
            var url = GetConfig("platform.application.oa.url") + WebConfigManager.GetAppSettings("OAWorkFlowData");
            var data = CallWebRequest.Post(url, "&account=" + userName + "&userId=" + userId);
            return data;

        }

        public static List<Api_Course> GetDreamClassCourse(string userId)
        {
            List<Api_Course> list = new List<Api_Course>();
            list = CacheRedis.Cache.Get<List<Api_Course>>(RedisKey.DreamCourse + userId);
            if (list != null && list.Count > 0)
                return list;

            var url = GetConfig("platform.system.dreamclass.url", true) + "rest/getTeacherCourseInfo";
            var result = Json.ToObject<ApiResult<Api_Course>>(CallWebRequest.Post(url, "&userId=" + userId));
            if (result.state)
                list = result.data;
            CacheRedis.Cache.Set(RedisKey.DreamCourse + userId, list, 30);//缓存30分钟失效
            return list;
        }

        /// <summary>
        /// 用户信息
        /// </summary>
        /// <param name="userId"></param>
        /// <returns></returns>
        public static Api_User GetUserInfoByUserName(string userName)
        {
            var model = new Api_User();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/getUserInfoByUserName";
            var result = Json.ToObject<ApiBase<Api_User>>(CallWebRequest.Post(url, "&userName=" + userName));
            if (result.status == true && result.data != null)
                model = result.data;
            return model;
        }

        public static Api_User GetUserInfoByUserId(string userId)
        {
            var model = new Api_User();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/getUserInfoByUserId";
            var result = Json.ToObject<ApiBase<Api_User>>(CallWebRequest.Get(url + "?userId=" + userId));
            if (result.status == true && result.data != null)
                model = result.data;
            return model;
        }

        public static Api_User GetUserByUserId(string userId)
        {
            var model = new Api_User();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/getUserByUserId";
            var result = Json.ToObject<ApiBase<Api_User>>(CallWebRequest.Get(url + "?userId=" + userId));
            if (result.status == true && result.data != null)
                model = result.data;
            return model;
        }


        public static ApiBase<string> UserExist(string userName)
        {
            ApiBase<string> result = new ApiBase<string>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/checkUserExists";
            result = Json.ToObject<ApiBase<string>>(CallWebRequest.Post(url, "&userName=" + userName));
            return result;

        }
        public static ApiBase<string> CheckUserPwd(string userName, string pwd)
        {
            ApiBase<string> result = new ApiBase<string>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/checkUserPsw";
            result = Json.ToObject<ApiBase<string>>(CallWebRequest.Post(url, "&userName=" + userName + "&psw=" + pwd));
            return result;

        }
        public static ApiBase<Api_AnswerQuestion> GetAnswerQuestion(string userName)
        {
            ApiBase<Api_AnswerQuestion> result = new ApiBase<Api_AnswerQuestion>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/safety/getSafetyByUserName";
            result = Json.ToObject<ApiBase<Api_AnswerQuestion>>(CallWebRequest.Post(url, "&userName=" + userName));
            return result;
        }

        public static ApiBase<string> ResetUserPassword(string userName, string newPassWord)
        {
            ApiBase<string> result = new ApiBase<string>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/resetUserPasswordByUserName";
            result = Json.ToObject<ApiBase<string>>(CallWebRequest.Post(url, "&userName=" + userName + "&newPassWord=" + newPassWord));
            return result;
        }
        public static ApiBase<string> ChangeUserSafeAnswer(string userId, string answer1, string answer2, string answer3, string safeId)
        {
            ApiBase<string> result = new ApiBase<string>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/safety/batchUpdageSafety";
            result = Json.ToObject<ApiBase<string>>(CallWebRequest.Post(url, "&data=[{editor:\"" + userId + "\",safetyAnswerOne:\"" + answer1 + "\",safetyAnswerTwo:\"" + answer2 + "\",safetyAnswerThree:\"" + answer3 + "\",safetyId:" + safeId + "}]"));
            return result;
        }

        public static ApiBase<string> UpdateUserPhoto(string userId, string userPhoto)
        {
            ApiBase<string> result = new ApiBase<string>();
            var url = WebConfigManager.GetAppSettings("DataCenterUrl") + "/rest/user/updataUserInfo";
            result = Json.ToObject<ApiBase<string>>(CallWebRequest.Post(url, "&data=[{userId:\"" + userId + "\",userPhoto:\"" + userPhoto + "\"}]"));
            return result;
        }

        public static Api_DreamClassUserInfo GetDreamClassUser(string userId)
        {
            var model = new Api_DreamClassUserInfo();
            //model = CacheRedis.Cache.Get<Api_DreamClassUserInfo>(RedisKey.DreamCourseUser + userId);
            var url = GetConfig("platform.system.dreamclass.url", true) + "rest/getUserInfo";
            var result = Json.ToObject<ApiBase<Api_DreamClassUserInfo>>(CallWebRequest.Post(url, "&userId=" + userId));
            if (result.state == true && result.data != null)
            {
                model = result.data;
                //CacheRedis.Cache.Set(RedisKey.DreamCourseUser+userId,model);
            }

            return model;
        }

        public static List<Api_BitCourse> GetBitCourseList(string userName)
        {
            List<Api_BitCourse> list = new List<Api_BitCourse>();
            list = CacheRedis.Cache.Get<List<Api_BitCourse>>(RedisKey.BitCourse + userName);
            if (list != null && list.Count > 0)
                return list;
            try
            {
                var url = GetConfig("platform.system.szhjxpt.url", true) + "/Services/DtpServiceWJL.asmx/GetMyCourseByLoginName";
                var result = Json.ToObject<ApiConfig<Api_BitCourse>>(CallWebRequest.Post(url, "&loginName=" + userName));

                if (result.success)
                    list = result.datas;
                CacheRedis.Cache.Set(RedisKey.BitCourse + userName, list, 30);//缓存30分钟失效
            }
            catch (Exception exception)
            {
                list = new List<Api_BitCourse>();
                Log.Error(exception.Message);
            }

            return list;
        }
    }