使用beanUtils封装对象的servlet

package com.hopetesting.web.servlet;

import com.hopetesting.dao.UserDao;
import com.hopetesting.domain.User;
import org.apache.commons.beanutils.BeanUtils;
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;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

/**
 * @author newcityman
 * @date 2019/9/1 - 0:24
 */
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        1、设置编码
         request.setCharacterEncoding("utf-8");
/*//         获取请求数据
        String username = request.getParameter("username");
        String password = request.getParameter("password");
//        3、封装user对象
        User loginUser = new User();
        loginUser.setPassword(password);
        loginUser.setUsername(username);*/
        User loginUser = new User();
        try {
            Map<String, String[]> map = request.getParameterMap();
          /*  Set<String> strings = map.keySet();
            for (String string : strings) {
                System.out.println(string);
                String[] values = map.get(string);
                for (String v : values) {
                    System.out.println(v);
                }
                System.out.println("===============");
            }*/

            BeanUtils.populate(loginUser,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

//        4、调用userdao的login方法
        UserDao userDao = new UserDao();
        User user = userDao.login(loginUser);
        if (user==null){
//            登陆失败
//            转发
            request.getRequestDispatcher("/failServlet").forward(request,response);
        }else{
//            登录成功
//            存储数据
            request.setAttribute("user",user);
//            转发
            request.getRequestDispatcher("/successServlet").forward(request,response);
        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
      this.doPost(request,response);
    }
}