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import domain.User;
import org.apache.commons.beanutils.BeanUtils;
import service.impl.userServiceImpl;

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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

/**
 * 用户登录
 */
@WebServlet("/loginServlet")
public class loginServlet extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{

    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1、设置编码
        request.setCharacterEncoding("UTF-8");

        //2、获取数据
        //检验验证码
        String verifycode = request.getParameter("verifycode");//输入的验证码
        HttpSession session = request.getSession();
        String checkCode = (String) session.getAttribute("CHECKCODE_SERVER");//正确的验证码
        session.removeAttribute("CHECKCODE_SERVER");//验证码是一次性的
        session.removeAttribute("login_msg");//提示信息清空

        if(!checkCode.equalsIgnoreCase(verifycode)){
            //验证码不正确
            request.setAttribute("login_msg","验证码错误！");

            request.getRequestDispatcher("/login.jsp").forward(request, response);
            return;
        }

        Map<String, String[]> map = request.getParameterMap();

        //3、封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);//给user的部分属性赋值
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }

        //4、调用Service查询
        userServiceImpl service = new userServiceImpl();
        User loginUser = service.login(user);

        //5、判断
        if (loginUser != null){
            //登录成功
            //将用户存入session，然后跳转页面
            request.getSession().setAttribute("loginUser",loginUser);
            response.sendRedirect(request.getContextPath() + "/index.jsp");
        }else{
            //登录失败
            request.setAttribute("login_msg","用户名或者密码错误");

            request.getRequestDispatcher("/login.jsp").forward(request, response);
        }
    }
}

	import domain.User;
	import org.apache.commons.beanutils.BeanUtils;
	import service.impl.userServiceImpl;

	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 javax.servlet.http.HttpSession;
	import java.io.IOException;
	import java.lang.reflect.InvocationTargetException;
	import java.util.Map;

	/**
	* 用户登录
	*/
	@WebServlet("/loginServlet")
	public class loginServlet extends HttpServlet {
	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{

	}

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	//1、设置编码
	request.setCharacterEncoding("UTF-8");

	//2、获取数据
	//检验验证码
	String verifycode = request.getParameter("verifycode");//输入的验证码
	HttpSession session = request.getSession();
	String checkCode = (String) session.getAttribute("CHECKCODE_SERVER");//正确的验证码
	session.removeAttribute("CHECKCODE_SERVER");//验证码是一次性的
	session.removeAttribute("login_msg");//提示信息清空

	if(!checkCode.equalsIgnoreCase(verifycode)){
	//验证码不正确
	request.setAttribute("login_msg","验证码错误！");

	request.getRequestDispatcher("/login.jsp").forward(request, response);
	return;
	}

	Map<String, String[]> map = request.getParameterMap();

	//3、封装User对象
	User user = new User();
	try {
	BeanUtils.populate(user,map);//给user的部分属性赋值
	} catch (IllegalAccessException e) {
	throw new RuntimeException(e);
	} catch (InvocationTargetException e) {
	throw new RuntimeException(e);
	}

	//4、调用Service查询
	userServiceImpl service = new userServiceImpl();
	User loginUser = service.login(user);

	//5、判断
	if (loginUser != null){
	//登录成功
	//将用户存入session，然后跳转页面
	request.getSession().setAttribute("loginUser",loginUser);
	response.sendRedirect(request.getContextPath() + "/index.jsp");
	}else{
	//登录失败
	request.setAttribute("login_msg","用户名或者密码错误");

	request.getRequestDispatcher("/login.jsp").forward(request, response);
	}
	}
	}