C# Winform 客戶端架構 呼叫 REST 傳輸 Json
阿新 • • 發佈：2019-01-28
【架構】
1. 定義 GET、POST、PUT、DELETE，標準REST基礎。
2. 為了相容多終端，日期、時間格式統一為Int，定義時間轉換工具類。（Java 與 C# getTime起算日不同，Java為1970年起）
3. Http圖片，載入到記憶體，顯示。工具類。
4. 反射 根據實體類動態生成 DataGridView 資料，提供複用性，減少程式設計師工作。
【JAVA服務端程式碼跳轉】點選開啟連結
【效果】以此圖效果為案例，描述架構過程
【DataGridView 資料動態生成】
1. 獲取搜尋條件，組裝URL
2. HttpClientUtil作為REST客戶端，呼叫GET方法，返回JSON字串
3. JSON字串，根據泛型，轉換成實體
4. 根據實體，反射遍歷實體所有屬性，動態生成DataTable
5. DataGridView 繫結 dataTable
private void listDataGridView() { string naturalId = this.txtNaturalId.Text; string barcode = this.txtBarcode.Text; string url = "/stocks/commoditystocks/" + "inPage/?pageNumber=1&pageSize=10&orderBy=&filter=naturalId_S_" + naturalId + "_LIKE__,barcode_S_" + barcode + "_LIKE__,qty_I_0_GT__&"; List<CommodityStocks> commodityStockList = HttpClientUtil.doGetMethodToObj<List<CommodityStocks>>(url); DataTable dataTable = HttpClientUtil.toDataTable(commodityStockList); this.dataGridView1.DataSource = dataTable; }
【HttpClientUtil 核心】
1. 定義 GET、POST、PUT、DELETE，標準REST基礎
2. 定義 Json 序列化，反序列化 私有方法
3. 定義 根據實體，反射遍歷實體所有屬性，動態生成DataTable
namespace WindowsFormsApplication1.xiazhi.common { public class HttpClientUtil { private static string xiazhi_tomcat_url = Properties.Settings.Default.xiazhi_server_url; private static string xiazhi_server_url = xiazhi_tomcat_url + "resteasy"; // REST @GET 方法，根據泛型自動轉換成實體，支援List<T> public static T doGetMethodToObj<T>(string metodUrl) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xiazhi_server_url + metodUrl); request.Method = "get"; request.ContentType = "application/json;charset=UTF-8"; HttpWebResponse response = null; try { response = (HttpWebResponse)request.GetResponse(); } catch (WebException e) { response = (HttpWebResponse)e.Response; MessageBox.Show(e.Message + " - " + getRestErrorMessage(response)); return default(T); } string json = getResponseString(response); return JsonConvert.DeserializeObject<T>(json); } // 將 HttpWebResponse 返回結果轉換成 string private static string getResponseString(HttpWebResponse response) { string json = null; using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding("UTF-8"))) { json = reader.ReadToEnd(); } return json; } // 獲取異常資訊 private static string getRestErrorMessage(HttpWebResponse errorResponse) { string errorhtml = getResponseString(errorResponse); string errorkey = "spi.UnhandledException:"; errorhtml = errorhtml.Substring(errorhtml.IndexOf(errorkey) + errorkey.Length); errorhtml = errorhtml.Substring(0, errorhtml.IndexOf("\n")); return errorhtml; } // REST @POST 方法 public static T doPostMethodToObj<T>(string metodUrl, string jsonBody) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xiazhi_server_url + metodUrl); request.Method = "post"; request.ContentType = "application/json;charset=UTF-8"; var stream = request.GetRequestStream(); using (var writer = new StreamWriter(stream)) { writer.Write(jsonBody); writer.Flush(); } HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string json = getResponseString(response); return JsonConvert.DeserializeObject<T>(json); } // REST @PUT 方法 public static string doPutMethod(string metodUrl) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xiazhi_server_url + metodUrl); request.Method = "put"; request.ContentType = "application/json;charset=UTF-8"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding("UTF-8"))) { return reader.ReadToEnd(); } } // REST @PUT 方法，帶傳送內容主體 public static T doPutMethodToObj<T>(string metodUrl, string jsonBody) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xiazhi_server_url + metodUrl); request.Method = "put"; request.ContentType = "application/json;charset=UTF-8"; var stream = request.GetRequestStream(); using (var writer = new StreamWriter(stream)) { writer.Write(jsonBody); writer.Flush(); } HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string json = getResponseString(response); return JsonConvert.DeserializeObject<T>(json); } // REST @DELETE 方法 public static bool doDeleteMethod(string metodUrl) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(xiazhi_server_url + metodUrl); request.Method = "delete"; request.ContentType = "application/json;charset=UTF-8"; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding("UTF-8"))) { string responseString = reader.ReadToEnd(); if (responseString.Equals("1")) { return true; } return false; } } //根據實體，反射遍歷實體所有屬性，動態生成DataTable public static DataTable toDataTable(IList list) { DataTable result = new DataTable(); if (list.Count > 0) { FieldInfo[] fieldInfos = list[0].GetType().GetFields(); foreach (FieldInfo fi in fieldInfos) { if (fi.Name.Length > 4 && fi.Name.LastIndexOf("Date") == fi.Name.Length - 4) { result.Columns.Add(fi.Name, "".GetType()); continue; } if (fi.Name.Length > 4 && fi.Name.LastIndexOf("Time") == fi.Name.Length - 4) { result.Columns.Add(fi.Name, "".GetType()); continue; } if (fi.Name.IndexOf("imagepath") >= 0) { result.Columns.Add(fi.Name, Image.FromFile("1.jpg").GetType()); continue; } result.Columns.Add(fi.Name, fi.FieldType); } for (int i = 0; i < list.Count; i++) { ArrayList tempList = new ArrayList(); foreach (FieldInfo fi in fieldInfos) { object obj = fi.GetValue(list[i]); if (null == obj) { tempList.Add(obj); continue; } if (fi.Name.Length > 4 && fi.Name.LastIndexOf("Date") == fi.Name.Length - 4) { int dateInt = (int)obj; if (0 == dateInt) { tempList.Add(""); continue; } obj = DateTimeUtil.convertIntDatetime(dateInt).ToShortDateString(); } if (fi.Name.Length > 4 && fi.Name.LastIndexOf("Time") == fi.Name.Length - 4) { int dateInt = int.Parse(obj.ToString()); if (0 == dateInt) { tempList.Add(""); continue; } obj = DateTimeUtil.convertIntDatetime(dateInt).ToString(); } if (fi.Name.IndexOf("imagepath") >= 0) { if (null == obj) { tempList.Add(""); continue; } WebClient myWebClient = new WebClient(); MemoryStream ms = new MemoryStream(myWebClient.DownloadData(xiazhi_tomcat_url + obj.ToString())); obj = Image.FromStream(ms); } tempList.Add(obj); } object[] array = tempList.ToArray(); result.LoadDataRow(array, true); } } return result; } } }
【Java -- C# 時間轉換】
namespace WindowsFormsApplication1.xiazhi.common.util
{
public class DateTimeUtil
{
public static int convertDateTimeInt(DateTime time)
{
int intResult = 0;
DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
intResult = int.Parse((time - startTime).TotalSeconds.ToString().Substring(0, 10));
return intResult;
}
public static DateTime convertIntDatetime(int utc)
{
DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
startTime = startTime.AddSeconds(utc);
return startTime;
}
public static DateTime getMonthFirstDay()
{
int year = DateTime.Now.Year;
int month = DateTime.Now.Month;
DateTime firstDayOfThisMonth = new DateTime(year, month, 1);
return firstDayOfThisMonth;
}
}
}