【SpringMVC】使用三层架构实现登录，注册。(上篇)

构思

界面层

1.jsp

【见名知义】

failed.jsp-->失败页面，登录、注册失败就跳转至失败页面

index.jsp-->默认生成的界面，没什么用

login.jsp-->登录界面

register.jsp-->注册界面

welcome.jsp-->欢迎界面，登录成功就跳转至欢迎界面

index.jsp

login.jsp

<%--

  Created by IntelliJ IDEA.

  User: Administrator

  Date: 2019/8/13

  Time: 17:29

  To change this template use File | Settings | File Templates.

--%>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>

    <title>登录页面</title>

</head>

<body>

<form action="${pageContext.request.contextPath}/login" method="post">

    <p>用户名:<input type="text" placeholder="请输入用户名" name="userName"></p>

    <p>密码:<input type="password" placeholder="请输入密码名" name="userPwd"></p>

    <p><input type="reset" value="重置"><input type="submit" value="登录"></p>

    <a href="${pageContext.request.contextPath}/register.jsp">

        没有账号？前往注册

    </a>

</form>

</body>

</html>

public final class CreateUser {

    public static User createUser(HttpServletRequest request, HttpServletResponse response){

        User nowUser=new User();

        try {//解决乱码

        request.setCharacterEncoding("utf-8");

        //收集用户信息

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

        //创建当前User对象

        //User nowUser=new User();

        //使用BeanUtils将信息塞入nowUser对象

            BeanUtils.populate(nowUser,parameterMap);

        } catch (IllegalAccessException | UnsupportedEncodingException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        return nowUser;

    }

}

2.登录LoginServlet

@WebServlet("/login")

public class LoginServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        User nowUser=CreateUser.createUser(request,response);

        System.out.println(nowUser.getUserName());

        //使用UserService服务,注册

        UserServiceImpl userService=new UserServiceImpl();

        boolean login = userService.login(nowUser);

        if(login){

            HttpSession session = request.getSession();

            session.setAttribute("user",nowUser);

            response.sendRedirect("welcome.jsp");

        }else {

            response.sendRedirect("failed.jsp");

        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request,response);

    }

}

3.注册RegisterServlet

@WebServlet("/register")

public class RegisterServlet extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        User nowUser=CreateUser.createUser(request,response);

        System.out.println(nowUser.getUserName());

        //使用UserService服务,注册

        UserServiceImpl userService=new UserServiceImpl();

        boolean register = userService.register(nowUser);

        if(register){

            HttpSession session = request.getSession();

            session.setAttribute("user",nowUser);

            response.sendRedirect("login.jsp");

        }else {

            response.sendRedirect("failed.jsp");

        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request,response);

    }

}

逻辑业务层、数据访问层请看下篇

https://blog.csdn.net/qq_42158942/article/details/99474259

巴特西

【SpringMVC】使用三层架构实现登录，注册。(上篇)

构思

界面层

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