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>
register.jsp
failed.jsp
welcome.jsp
2.Servlet
1.BeanUtils将表单信息塞进User对象里面储存，抽取一个工具类CreateUser
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