webapp 修改功能实现

userservlet

package com.iflytek.controller;

import dao.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/UserServlet")
public class UserServlet  extends HttpServlet {
    private UserDao userDao=new UserDao();

    public UserServlet() throws IOException {
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        String id= req.getParameter("id");
        System.out.println(id);

        UserDao userDao=new UserDao();
        User user=userDao.findUserById(Integer.parseInt(id));
        req.setAttribute("user",user);
        req.getRequestDispatcher("updateUser.jsp").forward(req,resp);
    }


    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String name =req.getParameter("userName");
        String age =req.getParameter("userAge");
        String id =req.getParameter("id");

        User user=new User();
        user.setId(Integer.parseInt(id));
        user.setName(name);
        user.setAge(Integer.parseInt(age));

        userDao.updateUser(user);

        req.getRequestDispatcher("testController").forward(req,resp);
    }
}

userdao

package com.iflytek.controller;

import dao.UserD