Winform項目調用asp.net數據接口

時間 2019-12-08

標籤 winform 項目調用 asp.net asp 數據接口欄目 ASP 简体版

原文原文鏈接

　　最近一個WPF項目須要改寫成android項目，思路是在asp.net項目中編寫一個通用接口，便於其它平臺下調用數據。剛接觸到這些東西的時候徹底是一頭霧水，最根本的緣由是不明白網站中的一個網頁，爲何其它項目就能夠訪問它，並獲取數據。帶着疑問在asp.net項目編寫一個簡單的數據接口，並新建一個小winform項目直接訪問它。本文涉及到的知識點有：在asp.net項目中如何編寫一個數據接口；使用反射辨別響應的方法；以及如何獲取接口的數據。這裏僅僅是介紹如何使用它們，而不講述使用它們的基本原理，一是本人道行淺薄對基本原理不瞭解，懼怕隨便書寫誤導後人；二是若是闡述其基本原理，勢必須要花費大量時間，奈什麼時候間有限。未來若是上述兩個條件知足，必會在最下面作出論述，由於這對本身的進步也是一個確定。閒話少說，開始正文。android

　　主要內容：json

　　一、asp.net項目下編寫數據接口服務器

　　二、使用反射分辨調用方法app

　　三、新建一個winform項目測試接口的正確性asp.net

一、在asp.net項目下編寫一簡單接口ide

編寫一個方法，構造一個json字符串Response便可。post

private void ExamInfoLogin()
        {
            string aa = "8";
            string bb = "9";

            string roomName = Request.Form["RoomName"];
            if (roomName == "806")
            {
                aa = "7";
            }           
            
            StringBuilder jsonStringBuilder = new StringBuilder();
            jsonStringBuilder.Append("{");
            jsonStringBuilder.Append("\"UName\":\"").Append(aa).Append("\",");
            jsonStringBuilder.Append("\"Password\":\"").Append(bb).Append("\"");
            jsonStringBuilder.Append("}");
            Response.Write(jsonStringBuilder.ToString());
        }

二、使用反射選取調用方法測試

假設在aspx頁面中有不少方法，而在使用過程當中每每僅須要調用其中的某一個方法，此處用反射選取調用方法。網站

反射過程當中使用的常量：ui

private const string PAGE_PATH_INFO = "/AppDataInterface/ExamLogin.aspx";//頁面
        private const string ASSEMBLY_NAME = "OSCEWEB";//程序集
        private const string CLASS_NAME = "OSCEWEB.AppDataInterface.ExamLogin";//類名

重寫OnInit方法：

protected override void OnInit(EventArgs e)
        {
            string pathInfo = Request.Params["PATH_INFO"];
            if (pathInfo.StartsWith(PAGE_PATH_INFO + "/"))
            {
                string[] nameList = pathInfo.Substring(PAGE_PATH_INFO.Length + 1).Split('/');
                if (nameList.Length < 1)
                {
                    Response.End();
                    return;
                }

                try
                {
                    Assembly assembly = Assembly.Load(ASSEMBLY_NAME);
                    Type type = assembly.GetType(CLASS_NAME);
                    MethodInfo method = type.GetMethod(nameList[0], System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    method.Invoke(this, null);
                }
                catch (Exception ex)
                {
                    Response.End();
                    return;
                }
            }
        }

在Page_Load方法中添加：

if (Request.Params["PATH_INFO"].StartsWith(PAGE_PATH_INFO + "/"))
            {
                Response.End();
            }

三、新建一Winform項目，訪問asp.net中數據接口

發佈asp.net項目，網址：http://192.168.4.22:8005

1）無需向數據接口傳遞數據：

private void button1_Click(object sender, EventArgs e)
        {
            string strURL = "http://192.168.4.22:8005/AppDataInterface/ExamLogin.aspx/ExamInfoLogin";
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            response = (System .Net.HttpWebResponse )request .GetResponse ();

            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }

獲得的數據是：{"UName":"8","Password":"9"}

2）以post方式向數據接口傳遞數據，獲取接口數據

private void button2_Click(object sender, EventArgs e)
        {
            string strURL = "http://192.168.4.22:8005/AppDataInterface/ExamLogin.aspx/ExamInfoLogin";

            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            string param = "RoomName=806";
            ASCIIEncoding encoding = new ASCIIEncoding ();
            byte[] data = encoding.GetBytes(param);
            request.ContentLength = data.Length;
            System.IO.Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            stream.Close();

            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }

獲得的數據：{"UName":"7","Password":"9"}

、、

string url = System.Configuration.ConfigurationSettings.AppSettings["GetHisOrderUrl"];
            string strXml = GetHisOrderXml(hisOrder);

            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest) System.Net.WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "text/xml;charset=utf-8";
            byte[] data = Encoding.UTF8.GetBytes(strXml);
            request.ContentLength = data.Length;
            request.Headers["SOAPAction"] = "http://tempuri.org/IRouterService/RunService";
            System.IO.Stream  stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            stream.Close();

            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse) request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response .GetResponseStream(),Encoding.UTF8);
            string responseStr = streamReader.ReadToEnd();
            streamReader.Close();

四、總結

　　按照上述介紹的一些方法確實能完成項目，可是對其爲何該如此仍是充滿疑惑，總感受心中無底、戰戰兢兢，但願有高手能夠對小弟指點一二，不勝感激。

附加：

一、post圖片上傳到服務器中：

public void UploadImage(string imgPath)
        {
            var postUrl = string.Empty;

            HttpWebRequest request = WebRequest.Create(postUrl) as HttpWebRequest;
            request.AllowAutoRedirect = true;
            request.Method = "POST";

            string boundary = DateTime.Now.Ticks.ToString("X"); // 隨機分隔線
            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");

            int pos = imgPath.LastIndexOf("\\");
            string fileName = imgPath.Substring(pos + 1);

            //請求頭部信息 
            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(imgPath, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();

            Stream postStream = request.GetRequestStream();
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();

            WebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }