C# HttpClient(包含Post和Get)

Posted 2023-05-27 懒树懒

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using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;

namespace SXYC.Common

    public class HttpClientHelpClass
    
        /// <summary>
        /// get请求
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string GetResponse(string url, out string statusCode)
        
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            var httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Accept.Add(
              new MediaTypeWithQualityHeaderValue("application/json"));
            HttpResponseMessage response = httpClient.GetAsync(url).Result;
            statusCode = response.StatusCode.ToString();
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            
            return null;
        

        public static string RestfulGet(string url)
        
            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
            // Get response
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            
                // Get the response stream
                StreamReader reader = new StreamReader(response.GetResponseStream());
                // Console application output
                return reader.ReadToEnd();
            
        

        public static T GetResponse<T>(string url)
           where T : class, new()
        
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            var httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Accept.Add(
               new MediaTypeWithQualityHeaderValue("application/json"));
            HttpResponseMessage response = httpClient.GetAsync(url).Result;

            T result = default(T);

            if (response.IsSuccessStatusCode)
            
                Task<string> t = response.Content.ReadAsStringAsync();
                string s = t.Result;

                result = JsonConvert.DeserializeObject<T>(s);
            
            return result;
        

        /// <summary>
        /// post请求
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData">post数据</param>
        /// <returns></returns>
        public static string PostResponse(string url, string postData, out string statusCode)
        
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            httpContent.Headers.ContentType.CharSet = "utf-8";

            HttpClient httpClient = new HttpClient();
            //httpClient..setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            statusCode = response.StatusCode.ToString();
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            

            return null;
        

        /// <summary>
        /// 发起post请求
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="url">url</param>
        /// <param name="postData">post数据</param>
        /// <returns></returns>
        public static T PostResponse<T>(string url, string postData)
            where T : class, new()
        
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            HttpClient httpClient = new HttpClient();

            T result = default(T);

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            if (response.IsSuccessStatusCode)
            
                Task<string> t = response.Content.ReadAsStringAsync();
                string s = t.Result;

                result = JsonConvert.DeserializeObject<T>(s);
            
            return result;
        


        /// <summary>
        /// 反序列化Xml
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="xmlString"></param>
        /// <returns></returns>
        public static T XmlDeserialize<T>(string xmlString)
            where T : class, new()
        
            try
            
                XmlSerializer ser = new XmlSerializer(typeof(T));
                using (StringReader reader = new StringReader(xmlString))
                
                    return (T)ser.Deserialize(reader);
                
            
            catch (Exception ex)
            
                throw new Exception("XmlDeserialize发生异常：xmlString:" + xmlString + "异常信息：" + ex.Message);
            

        

        public static string PostResponse(string url, string postData, string token, string appId, string serviceURL, out string statusCode)
        
            if (url.StartsWith("https"))
                System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            httpContent.Headers.ContentType.CharSet = "utf-8";

            httpContent.Headers.Add("token", token);
            httpContent.Headers.Add("appId", appId);
            httpContent.Headers.Add("serviceURL", serviceURL);


            HttpClient httpClient = new HttpClient();
            //httpClient..setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");

            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;

            statusCode = response.StatusCode.ToString();
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            

            return null;
        

        /// <summary>
        /// 修改API
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <returns></returns>
        public static string KongPatchResponse(string url, string postData)
        
            var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
            httpWebRequest.ContentType = "application/x-www-form-urlencoded";
            httpWebRequest.Method = "PATCH";

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

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

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

            return responseContent;
        

        /// <summary>
        /// 创建API
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <returns></returns>
        public static string KongAddResponse(string url, string postData)
        
            if (url.StartsWith("https"))
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded")  CharSet = "utf-8" ;
            var httpClient = new HttpClient();
            HttpResponseMessage response = httpClient.PostAsync(url, httpContent).Result;
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            
            return null;
        

        /// <summary>
        /// 删除API
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static bool KongDeleteResponse(string url)
        
            if (url.StartsWith("https"))
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            var httpClient = new HttpClient();
            HttpResponseMessage response = httpClient.DeleteAsync(url).Result;
            return response.IsSuccessStatusCode;
        

        /// <summary>
        /// 修改或者更改API        
        /// </summary>
        /// <param name="url"></param>
        /// <param name="postData"></param>
        /// <returns></returns>
        public static string KongPutResponse(string url, string postData)
        
            if (url.StartsWith("https"))
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            HttpContent httpContent = new StringContent(postData);
            httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded")  CharSet = "utf-8" ;

            var httpClient = new HttpClient();
            HttpResponseMessage response = httpClient.PutAsync(url, httpContent).Result;
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            
            return null;
        

        /// <summary>
        /// 检索API
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static string KongSerchResponse(string url)
        
            if (url.StartsWith("https"))
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

            var httpClient = new HttpClient();
            HttpResponseMessage response = httpClient.GetAsync(url).Result;
            if (response.IsSuccessStatusCode)
            
                string result = response.Content.ReadAsStringAsync().Result;
                return result;
            
            return null;

.Net(C#)后台发送Get和Post请求的几种方法总结

1、通过HttpClient发送Get和Post请求

适用平台：.NET Framework 4.5+, .NET Standard 1.1+, .NET Core 1.0+

其它平台的移植版本可以通过Nuget来安装。(Nuget使用方法：http://www.cjavapy.com/article/21/)

命名空间：using System.Net.Http;

HttpClient推荐使用单一实例共享使用，发关请求的方法推荐使用异步的方式，代码如下，

private static readonly HttpClient client = new HttpClient();//发送Get请求var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");//发送Post请求var values = new Dictionary{ { "thing1", "hello" }, { "thing2", "world" }};var content = new FormUrlEncodedContent(values);var response = await client.PostAsync("http://www.ywc0.com/recepticle.aspx", content);var responseString = await response.Content.ReadAsStringAsync();

2、通过第三方类库发送Get和Post请求

1）Flurl.Http(可以通过Nuget来安装)

命名空间：using Flurl.Http;

//发送Get请求var responseString = await "http://www.example.com/recepticle.aspx" .GetStringAsync();//发送Post请求var responseString = await "http://www.example.com/recepticle.aspx" .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" }) .ReceiveString();

2）RestSharp(可以通过Nuget来安装)

//发送Get和Post请求 RestClient client = new RestClient("http://ywc0.com");//指定请求的url RestRequest req = new RestRequest("resource/{id}", Method.GET);//指定请求的方式，如果Post则改成Method.POSTrequest.AddParameter("name", "value"); // 添加参数到 URL querystringrequest.AddUrlSegment("id", "123"); // 替换上面指定请求方式中的{id}参数//req.AddBody(body); /*如发送post请求，则用req.AddBody()指定body内容*///发送请求得到请求的内容//如果有header可以使用下面方法添加//request.AddHeader("header", "value");IRestResponse response = client.Execute(request);//上传一个文件//request.AddFile("file", path);var content = response.Content; // 未处理的content是string//还可以下面几种方式发送请求//发送请求,反序列化请求结果IRestResponse response2 = client.Execute(request);var name = response2.Data.Name;//发送请求下载一个文件，并保存到path路径client.DownloadData(request).SaveAs(path);// 简单发送异步请求await client.ExecuteAsync(request);// 发送异常请求并且反序列化结果var asyncHandle = client.ExecuteAsync(request, response => { Console.WriteLine(response.Data.Name);});//终止异步的请求asyncHandle.Abort();

3、比较老一点的方法通过WebRequest发送请求

适用平台：.NET Framework 1.1+, .NET Standard 2.0+, .NET Core 1.0+

命名空间：
using System.Net;
using System.Text; // for class Encoding
using System.IO; // for StreamReader

//发送Get请求var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");var response = (HttpWebResponse)request.GetResponse();var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();//发送Post请求var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");var postData = "thing1=hello"; postData += "&thing2=world";var data = Encoding.ASCII.GetBytes(postData);request.Method = "POST";request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = data.Length;using (var stream = request.GetRequestStream()){ stream.Write(data, 0, data.Length);}var response = (HttpWebResponse)request.GetResponse();var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

4、通过WebClient的方式发送请求

适用平台：.NET Framework 1.1+, .NET Standard 2.0+, .NET Core 2.0+

命名空间：
using System.Net;
using System.Collections.Specialized;

using System.Net;using System.Collections.Specialized;//发送Get请求 string url = string.Format("http://localhost:28450/api/values?p1=a&p2=b"); using (var wc = new WebClient()){ Encoding enc = Encoding.GetEncoding("UTF-8"); Byte[] pageData = wc.DownloadData(url); string re = enc.GetString(pageData);}//发送Post请求using (var client = new WebClient()){ var values = new NameValueCollection(); values["thing1"] = "hello"; values["thing2"] = "world"; var response = client.UploadValues("http://www.ywc0.com/recepticle.aspx", values); var responseString = Encoding.Default.GetString(response);}

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