C#調用接口注意要點

時間 2019-12-07

標籤 c# 調用接口注意要點欄目 C# 简体版

原文原文鏈接

在用C#調用接口的時候，遇到須要經過調用登陸接口才能調用其餘的接口，由於在其餘的接口須要在登陸的狀態下保存Cookie值纔能有權限調用，json

因此首先須要經過調用登陸接口來保存cookie值，再進行其餘接口的調用瀏覽器

1.經過Get方式服務器

        #region get方式

        public string HttpGet(string url)
        {

            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "application/json";
            request.Headers["Accept-Encoding"] = "gzip,deflase";
            request.AutomaticDecompression = DecompressionMethods.GZip;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            // HttpCookie cookies = new HttpCookie("admin");  //若是有須要經過登陸實現保存cookie值的話能夠加一部分
            // cookies.Value = Convert.ToString(response.Headers["Set-Cookie"]); // 經過響應請求讀取帶cookie的http數據
            // cookies.Expires = DateTime.Now.AddDays(1);
            //  HttpContext.Current.Response.Cookies.Add(cookies);

            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
        #endregion

可是並非全部的get請求都須要添加這個heard的內容，有些加了這個可能出現亂碼的狀況，因此不要設置Accept-Encoding的Headercookie

此處之因此加此header，是由於看到網頁分析工具中所獲得的瀏覽器瀏覽該網頁，對應的http的header的內容中，就是這樣設置的。app

因此，代碼中，也是模擬瀏覽器去訪問網頁，就設置了對應的Accept-Encoding爲gzip,deflate了工具

普通瀏覽器訪問網頁，之因此添加："Accept-Encoding" = "gzip,deflate"post

那是由於，瀏覽器對於從服務器中返回的對應的gzip壓縮的網頁，會自動解壓縮，因此，其request的時候，添加對應的頭，代表本身接受壓縮後的數據。測試

同時添加了 request.AutomaticDecompression = DecompressionMethods.GZip;這一句，即可以得到正確的數據。編碼

若是你獲取網頁內容太大的話，那麼仍是能夠用這個辦法的，這樣就可讓HttpWebRequest自動幫你實現對應的解壓縮了，能夠減小數據數據傳輸量，節省時間，提升效率。url

2.經過post方式

public string HttpPost2(string url, string body)
{

   //把用戶傳過來的數據轉成「UTF-8」的字節流
    Encoding encoding = Encoding.UTF8;
    //先根據用戶請求的uri構造請求地址
    //建立Web訪問對象
    HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
    request.Method = "POST";
    // request.Accept = "application/json";
   request.ContentType = "application/json; charset=UTF-8";
   request.Headers["Accept-Encoding"] = "gzip, deflate";
   request.AutomaticDecompression = DecompressionMethods.GZip;
   //HttpCookie Cookie = System.Web.HttpContext.Current.Request.Cookies["admin"];  //如果須要登陸事後再能訪問獲取url的數據，須要在請求頭中設置cookie值
   //if (Cookie != null)
   //    request.Headers.Add("Cookie", Cookie.Value.ToString());

   byte[] buffer = encoding.GetBytes(body);
   request.ContentLength = buffer.Length;
   request.GetRequestStream().Write(buffer, 0, buffer.Length);
   //經過Web訪問對象獲取響應內容
   HttpWebResponse response = (HttpWebResponse) request.GetResponse();
   //經過響應內容流建立StreamReader對象，由於StreamReader更高級更快
   using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
   {
    return reader.ReadToEnd();//利用StreamReader就能夠從響應內容從頭讀到尾
   }
 }

3.經過put請求

        #region Put請求
        public string Put(string data, string uri)
        {//建立Web訪問對象
            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(uri);
            //把用戶傳過來的數據轉成「UTF-8」的字節流
            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);

            Request.Method = "PUT";
            Request.ContentLength = buf.Length;
            Request.ContentType = "application/json";
            Request.MaximumAutomaticRedirections = 1;
            Request.AllowAutoRedirect = true;
            //發送請求
            Stream stream = Request.GetRequestStream();
            stream.Write(buf, 0, buf.Length);
            stream.Close();

            //獲取接口返回值
            //經過Web訪問對象獲取響應內容
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //經過響應內容流建立StreamReader對象，由於StreamReader更高級更快
            StreamReader reader = new StreamReader(Response.GetResponseStream(), Encoding.UTF8);
            //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//若是有編碼問題就用這個方法
            string returnXml = reader.ReadToEnd();//利用StreamReader就能夠從響應內容從頭讀到尾
            reader.Close();
            Response.Close();
            return returnXml;

        }           
        #endregion

4.經過Delete請求

        #region Delete請求
        public string Delete(string data, string uri)
        {
            //建立Web訪問對象
            HttpWebRequest Request = (HttpWebRequest)WebRequest.Create(uri);
            //把用戶傳過來的數據轉成「UTF-8」的字節流
            byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);

            Request.Method = "DELETE";
            Request.ContentLength = buf.Length;
            Request.ContentType = "application/json";
            Request.MaximumAutomaticRedirections = 1;
            Request.AllowAutoRedirect = true;
            //發送請求
            Stream stream = Request.GetRequestStream();
            stream.Write(buf, 0, buf.Length);
            stream.Close();

            //獲取接口返回值
            //經過Web訪問對象獲取響應內容
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //經過響應內容流建立StreamReader對象，由於StreamReader更高級更快
            StreamReader reader = new StreamReader(Response.GetResponseStream(), Encoding.UTF8);
            //string returnXml = HttpUtility.UrlDecode(reader.ReadToEnd());//若是有編碼問題就用這個方法
            string returnXml = reader.ReadToEnd();//利用StreamReader就能夠從響應內容從頭讀到尾
            reader.Close();
            Response.Close();
            return returnXml;

        }
       #endregion