我有想要獲得有效響應的 servlet 代碼。這是請求的原始布局 {  "function": "Check",  "teamId": "<teamId>",  "teamKey": "<teamKey>",  "requestId": "<request-id>",  "firstName": "<FirstName>",  "lastName": "<LastName>",  "ticketNumber": "<ticket-num>"}我在 Intellij 的 servlet 中有這個。import com.google.gson.*;import com.google.*;import org.apache.*;import org.apache.http.*;@WebServlet(name = "Logincheck", urlPatterns = {"/Logincheck"})public class Servlet extends HttpServlet {String teamID = "IC106-2";String teamKey = "1b3741ccf6d9ec5245055370125d901e";String url="http://fys.securidoc.nl:11111/Ticket";int Min = 1;int Max = 100;int REQ_ID =  Min + (int)(Math.random() *((Max - Min)+1));    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//index.html form user input     String fname = request.getParameter("firstName");    String lastName = request.getParameter("lname");    String ticketNummer = request.getParameter("ticketnr");    JsonParser parser = new JsonParser();    URL object=new URL(url);    String ticketCheck = "{\"function:\"Check\",\"teamId\":\"IC106-2\",\"teamKey\":\"1b3741ccf6d9ec5245055370125d901e\",\"requestId\":\""+REQ_ID+"\",\"firstName\":\""+fname+"\",\"lastName\":\""+lastName+"\",\"ticketNumber\":\""+ticketNummer+"\"}";    }}現在，當我點擊運行時，它會打開我的 index.html，當我單擊登錄按鈕到 /Logincheck 時，它會響應（在 intellij 內）：Bad RequestTeamkey 和 TeamID 100% 正確，但我可能忽略了與 Json 相關的一些事情。一般來說，我對 Json 和 servlet 的經驗很少。就像我制作硬編碼的登錄和票證憑據一樣，還是用戶的輸入正確已經正確？我應該期待這樣的回應：{  "ticketStatus": "<ticket-status>",  "requestId": "<request-id>",  "result": "<result-code>",  "resultText": "<result-text>"}