ошибка при попытке выполнить сервлет регистрации

Question

говорит, что: HTTP-метод POST не поддерживается этим URL-адресом.

Указанный HTTP-метод не разрешен для запрашиваемого ресурса.

вот мой сервлет код:

import java.io.IOException; 
import java.io.PrintWriter; 
import java.sql.Connection; 
import java.sql.PreparedStatement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 

import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
import java.sql.Statement; 
public class UserController extends HttpServlet { 
    private static final long serialVersionUID = 1L; 
    private static final int Id = 0; 
    private static final String Password = null; 
    private static final String Username = null; 
    private static final int Userid = 0; 
    private static String INSERT_OR_EDIT = "/user.jsp"; 
    private static String LIST_USER = "/listUser.jsp"; 
    public static String PARAM_USERNAME = "uname"; 
    public static String PARAM_PASSWORD = "pass"; 
    private UserDao dao; 
    private Connection connection; 


    public UserController() { 
     super(); 
     dao = new UserDao(); 
    } 


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    { 
     String forward=""; 
     String act = request.getParameter("act"); 
     if (act != null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("login")) { 
      forward= "/Login.jsp"; 
      } 

     else if (act != null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("delete")) 
     { 
      int userId = Integer.parseInt(request.getParameter("userId")); 
      dao.deleteUser(userId); 
      forward = LIST_USER; 
      request.setAttribute("users", dao.getAllUsers());  
     } else if (act!=null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("edit")){ 
      forward = INSERT_OR_EDIT; 
      int userId = Integer.parseInt(request.getParameter("userId")); 
      User user1 = dao.getUserById(userId); 
      request.setAttribute("user", user1); 
     } else if (act!=null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("listUser")){ 
      forward = LIST_USER; 
      request.setAttribute("users", dao.getAllUsers()); 
     } else if (act!=null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("register")){ 
      forward = "/reg.jsp"; 
      // request.setAttribute("users", dao.getAllUsers()); 
     }else if (act!=null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("update")){ 
      forward = "/welcome.jsp"; 
     } else 
      forward = "/Login.jsp"; 

     RequestDispatcher view = request.getRequestDispatcher(forward); 
     view.forward(request, response); 
     } 


    protected void doPost(HttpServletRequest request, HttpServletResponse response, Details details) throws ServletException, IOException { 

     response.setContentType("text/html"); 
     PrintWriter out=response.getWriter(); 

     String act = request.getParameter("act"); 
     if (act != null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("login")) { 

      String str=request.getParameter("username"); 
      String str1=request.getParameter("password"); 


      if(str.equalsIgnoreCase("shreya")&&str1.equalsIgnoreCase("singh")) 
      {   
       System.out.println("Login!"); 
        request.setAttribute("users",dao.getAllUsers()); 
        request.getRequestDispatcher("/listUser.jsp").forward(request, response); 

      }else 
      { 
        System.out.println("Login failed!"); 

       } 
     } 







     if (act != null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("register")) 
     { 

      String userid1=request.getParameter("userid"); 
      String username=request.getParameter("username"); 
      String password=request.getParameter("password"); 
      String id=request.getParameter("id"); 


      if(userid1.equals("") || username.equals("") || password.equals("") || id.equals("")) 
      { 
       out.println("Please insert valid data"); 
      } 
      RequestDispatcher rd = request.getRequestDispatcher("/listUser.jsp"); 
      rd.include(request, response); 
      } 

     else 
     { 
      RequestDispatcher rd = request.getRequestDispatcher("/listUser.jsp"); 
      rd.include(request, response); 

     try { 
      PreparedStatement preparedStatement = connection. 
        prepareStatement("select * from details where id=?"); 
      preparedStatement.setInt(1, Id); 
      ResultSet rs = preparedStatement.executeQuery(); 

      if (rs.next()) { 
       details.setUserid(rs.getInt("userid")); 
       details.setUsername(rs.getString("username")); 
       details.setPassword(rs.getString("password")); 
       details.setId(rs.getInt("id")); 
      } 


     PreparedStatement preparedStatement1 = connection. 
       prepareStatement("insert into details values(?,?,?,?)"); 
     preparedStatement1.setInt(1, Userid); 
     preparedStatement1.setString(2, Username); 
     preparedStatement1.setString(3, Password); 
     preparedStatement1.setInt(4, Id); 

     int i=preparedStatement1.executeUpdate(); 
     if(i>0) 
     { 
      System.out.println("Data updated sucessfully"); 
      System.out.print("Student record successfully inserted"); 
      RequestDispatcher rd1 = request.getRequestDispatcher("/registration.jsp"); 
      rd1.include(request, response); 
     } 
     } 
     catch (Exception e) 
     { 
      System.out.println(e); 
     } 
     if (act != null && !act.equalsIgnoreCase("null") && act.equalsIgnoreCase("update")) 
     { 
      String userid=request.getParameter("userid"); 
      String username=request.getParameter("username"); 
      String password=request.getParameter("password"); 
      String id=request.getParameter("id"); 
      try 
      { 
      Statement stmt = connection.createStatement(); 
      String sql = "UPDATE details SET username='hi',password='hello' where id=1"; 
      stmt.executeUpdate(sql); 
      dao.saveData(details, sql); 
      System.out.println("Data update sucessfully"); 
        } 
          catch (SQLException e) { 
           e.printStackTrace(); 
          } 
         catch (Exception e) { 
           e.printStackTrace(); 
          } 
          finally{ 
           try { 
            connection.close(); 
           } catch (SQLException e) { 
            e.printStackTrace(); 
           } 
          } 

          } 
         } 
        } 
       } 

ранее работал должным образом. Я предполагаю, что есть что-то не так с методом пост

Answer 1

HttpServlet Метод doPost(HttpServletRequest req, HttpServletResponse resp) является

protected void doPost(HttpServletRequest req, HttpServletResponse resp) 
    throws ServletException, IOException 
{ 
    String protocol = req.getProtocol(); 
    String msg = lStrings.getString("http.method_post_not_supported"); 
    if (protocol.endsWith("1.1")) { 
     resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, msg); 
    } else { 
     resp.sendError(HttpServletResponse.SC_BAD_REQUEST, msg); 
    } 
} 

Который немедленно реагирует с METHOD_NOT_ALLOWED. Вы не преодолели этот метод. Вы перегрузили его, чтобы добавить параметр Details. Это, следовательно, не называют

protected void doPost(HttpServletRequest request, HttpServletResponse response, Details details) throws ServletException, IOException { 

Где вы ожидаете эти Details прийти от? Если что-нибудь, переопределите метод doPost и сделайте так, чтобы он вызвал ваш метод.

Answer 2

Изменить

protected void doPost(HttpServletRequest request, HttpServletResponse response, 
     Details details) throws ServletException, IOException 

Для

protected void doPost(HttpServletRequest request, HttpServletResponse response) 
    throws ServletException, IOException 

doPost