创建servlet组件获取用户名和密码怎样实现

这种功能如何实现，工具是eclipse和tomcat，最近正在做这个实训项目想请教一下大家

package com.itheima;

import com.itheima.mapper.UserMapper;
import com.itheima.pojo.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

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.io.InputStream;
import java.io.PrintWriter;
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //接收用户名和密码
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        //调用mybatis查询
        //获取SqlSessionFactory对象
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //获取Mapper
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        //调用方法
        User user = userMapper.select(username, password);
        //释放资源
        sqlSession.close();
        //判断user是否为null
        resp.setContentType("text/html;charset=utf-8");
        PrintWriter writer = resp.getWriter();
        if (user != null) {
            //登录成功
            resp.sendRedirect("./main.html");
        } else {
            //登录失败
            resp.sendRedirect("./login.html");
        }
    }

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

    }
}

登录代码,望采纳

前端通过表单发送数据，后端获取一下就行