Java ee 注释不起作用

Question

我第一次尝试在我的 servlet 中编写注释。 @WebServlet 工作正常。当我添加 @webInitParam 时，我得到了红线。还，当我尝试使用 @POST 注释时，它给出了 “POST 无法解析为类型”。这是我的代码:

package servlets;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 * Servlet implementation class Calc
 */
@WebServlet (loadOnStartup = 1 , urlPatterns = { "/CoolPage" } , 
 initParams = {
        @WebInitParam(name="text" , value="hello" , description="simple text"),
    @WebInitParam(name="times", value="10" , description="times to print")
              }
) 
public class Calc extends HttpServlet {
    private static final long serialVersionUID = 1L;


public Calc() {
}


 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws              ServletException, IOException {
    // TODO Auto-generated method stub
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
@POST
protected void doThePost(HttpServletRequest request, HttpServletResponse response) throws  ServletException, IOException {

    System.out.println("Inside the POST method");
    String username = request.getParameter("userName");
    String password = request.getParameter("password");

    request.setAttribute("userName", username);
    request.setAttribute("password", password);

    RequestDispatcher rd = request.getRequestDispatcher("jspGetting.jsp");
    rd.forward(request, response);
}

}

Answer 1

导入不包括子包。从javax.servlet.annotation包导入类

import javax.servlet.annotation.WebInitParam;

如果不导入 WebServlet，很难看出 servlet 是如何编译的(？)。

import javax.servlet.annotation.WebServlet;

POST 注释位于 JAX-RS library 内

import javax.ws.rs.POST;