请求WebApi的几种方式

目前所了解的请求WebAPI的方式有通过后台访问api 和通过js 直接访问api接口

首先介绍下通过后台访问api的方法，可以使用HttpClient的方式也可以使用WebRequest的方式

1、HttpClient的方式

　　（1）Get请求

        string url = "http://10.1.1.1:8080/";

        public ActionResult GetAll()

        {

            HttpClient client = new HttpClient();

            client.BaseAddress = new Uri(url);

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = client.GetAsync("api/goods/getlist?pageindex=0&pagesize=10").Result;  // Blocking call（阻塞调用）! 

            var result = "";

            if (response.IsSuccessStatusCode)

            {

                result = response.Content.ReadAsStringAsync().Result;

                JavaScriptSerializer Serializer = new JavaScriptSerializer();

                var items = Serializer.DeserializeObject(result);

                return Json(items);

            }

            else

            {

                return Json(result);

            }

        }

　　（2）Post请求

        [HttpPost]

        public ActionResult AddGood(string paramObj)

        {

            HttpClient client = new HttpClient();

            client.BaseAddress = new Uri(url);

            JavaScriptSerializer jss = new JavaScriptSerializer();

            var item = jss.Deserialize<Good>(paramObj);

            var content = new FormUrlEncodedContent(new Dictionary<string, string>()

                {

                    {"Id","382accff-57b2-4d6e-ae84-a61e00a3e3b5"},

                    {"Category",""}

                 });

            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            HttpResponseMessage response = client.PostAsync("api/goods/add", content).Result;

            var result = "";

            if (response.IsSuccessStatusCode)

            {

                result = response.Content.ReadAsStringAsync().Result;

                JavaScriptSerializer Serializer = new JavaScriptSerializer();

                var items = Serializer.DeserializeObject(result);

                return Json(items);

            }

            return View();

        }

2、WebRequest的方式（该方式是post请求的时候传入json字符串转换成流的形式，无需再将json转换成需要的实体对象了）

所以这种方式只需写一个公共的方法，每次调用的时候传入地址和参数即可

公共方法如下：

    public class WebRequestHelper

    {

        public static string GetRequest(string url)

        {

            string responseStr = string.Empty;

            WebRequest request = WebRequest.Create(url);

            request.Method = "Get";

            var response = request.GetResponse();

            Stream ReceiveStream = response.GetResponseStream();

            using (StreamReader stream = new StreamReader(ReceiveStream, Encoding.UTF8))

            {

                responseStr = stream.ReadToEnd();

            }

            return responseStr;

        }

        public static string PostRequest(string url, string postParameter)

        {

            string responseStr = string.Empty;

            WebRequest request = WebRequest.Create(url);

            request.Method = "Post";

            request.ContentType = "application/json";

            byte[] requestData = System.Text.Encoding.UTF8.GetBytes(postParameter);

            request.ContentLength = requestData.Length;

            Stream newStream = request.GetRequestStream();

            newStream.Write(requestData, , requestData.Length);

            newStream.Close();

            var response = request.GetResponse();

            Stream ReceiveStream = response.GetResponseStream();

            using (StreamReader stream = new StreamReader(ReceiveStream, Encoding.UTF8))

            {

                responseStr = stream.ReadToEnd();

            }

            return responseStr;

        }

        /// <summary>

        /// Http的 WebRequest的特定实现

        /// </summary>

        /// <param name="Url"></param>

        /// <param name="JSONData"></param>

        /// <returns></returns>

        public static string GetResponseData(string Url, string JSONData)

        {

            byte[] bytes = Encoding.UTF8.GetBytes(JSONData);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

            request.Method = "POST";

            request.ContentLength = bytes.Length;

            request.ContentType = "application/json";

            Stream reqstream = request.GetRequestStream();

            reqstream.Write(bytes, , bytes.Length);

            //声明一个HttpWebRequest请求

            request.Timeout = ;

            //设置连接超时时间

            request.Headers.Set("Pragma", "no-cache");

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream streamReceive = response.GetResponseStream();

            Encoding encoding = Encoding.UTF8;

            StreamReader streamReader = new StreamReader(streamReceive, encoding);

            string strResult = streamReader.ReadToEnd();

            streamReceive.Dispose();

            streamReader.Dispose();

            return strResult;

        }

    }

调用的使用方法

　　（1）Get请求

        public ActionResult GetAll()

        {

            string result = WebRequestHelper.GetRequest(url + "api/goods/getlist?pageindex=0&pagesize=10");

            JavaScriptSerializer Serializer = new JavaScriptSerializer();

            var items = Serializer.DeserializeObject(result);

            return Json(items);

        }

　　（2）Post请求

        [HttpPost]

        public ActionResult AddGood(string paramObj)

        {

            string result = WebRequestHelper.PostRequest(url + "api/goods/add", paramObj);

            JavaScriptSerializer Serializer = new JavaScriptSerializer();

            var items = Serializer.DeserializeObject(result);

            return Json(items);

        }

页面通过jquery调用

代码如下：

        $.ajax({

            type: "get",

            url: "/goods/getall",

            dataType: "json",

            data: null,

            //data: JSON.stringify({

            //    id: "382accff-57b2-4d6e-ae84-a61e00a3e3b6"

            //}),

            contentType: "application/json;charset-utf-8",

            success: function (data) {

                console.log(data);

            }

        });

        var paramObj = { Id: "382accff-57b2-4d6e-ae84-a61e00a3e3b8",Category:111};

        $.ajax({

            type: "post",

            url: "/goods/AddGood",

            dataType: "json",

            //data: null,

            data: JSON.stringify({

                paramObj: JSON.stringify(paramObj)

            }),

            contentType: "application/json;charset-utf-8",

            success: function (data) {

                console.log(data);

            }

        });

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请求WebApi的几种方式

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