session,cookie实现购物车，登录-记住密码

dao

public class GoodDao {
    QueryRunner queryRunner = QueryRunnerUtils.getQueryRunner();

    //查询所有商品
    public List allGood() {
        String sql = "select * from good";
        List list = null;
        try {
            list = queryRunner.query(sql, new BeanListHandler<>(Good.class));
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }

    public Good goodById(int id) {
        String sql = "select * from good where id = ?";
        Good good = null;
        try {
            good = queryRunner.query(sql, new BeanHandler<>(Good.class), id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return good;
    }
}

实体类

package com.entity;

public class Good {
    private int id;
    private String name;
    private double price;

    public Good() {
    }

    public Good(int id, String name, double price) {
        this.id = id;
        this.name = name;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Good{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                '}';
    }
}

servlet

@WebServlet(name = "LoginCookieServlet", value = "/LoginCookieServlet")
public class LoginCookieServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //防止中文乱码
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset:utf-8");
        //获取账号密码的值
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        //此处没有联动数据库，做个伪登录，假设登录状态为flag
        boolean flag = true;
        if (flag) {
            //登录成功
            String[] remembers = request.getParameterValues("remember");
            if (remembers != null) {
                for (int i = 0; i < remembers.length; i++) {
                    if ("chose".equals(remembers[i])) {
                        //点击记住密码
                        Cookie nameCookie = new Cookie("username", username);
                        Cookie passwordCookie = new Cookie("password", password);
                        //设置时效
                        nameCookie.setMaxAge(60 * 60 * 24);
                        passwordCookie.setMaxAge(60 * 60 * 24);
                        //加入响应对象
                        response.addCookie(nameCookie);
                        response.addCookie(passwordCookie);
                    } else {
                        //取消记住密码
                        Cookie nameCookie = new Cookie("username", null);
                        Cookie passwordCookie = new Cookie("password", null);
                        //设置时效
                        nameCookie.setMaxAge(0);
                        passwordCookie.setMaxAge(0);
                        //加入响应对象
                        response.addCookie(nameCookie);
                        response.addCookie(passwordCookie);
                    }
               /* if ("auto".equals(remembers[i])){
                    //选中自动登录
                    //将用户名密码存入session
                    session.setAttribute("name",username);
                    session.setAttribute("psw",password);
                    //设置session时效
                    session.setMaxInactiveInterval(60*60*24);
                    //将session放入cookie中
                    Cookie cookieSession = new Cookie("JSESSIONID", session.getId());
                    //设置cookie时效
                    cookieSession.setMaxAge(60*60*24);
                    //加入响应对象
                    response.addCookie(cookieSession);
                }else {
                    //取消自动登录

                }*/

                }
            }
            //获取session
            HttpSession session = request.getSession();
            //将用户名存入session
            session.setAttribute("name", username);
            response.sendRedirect("index.jsp");

        } else {
            //登录失败
            response.sendRedirect("login.jsp");
        }
    }
}

package com.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;

@WebServlet(name = "SessionServlet", value = "/SessionServlet")
public class SessionServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取到session对象
        HttpSession session = request.getSession();
        //使session立即无效
        session.invalidate();
        //返回登录界面
        response.sendRedirect("login.jsp");
    }

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

    }
}

package com.servlet;

import com.dao.GoodDao;
import com.entity.Good;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "ShoopServlet", value = "/ShoopServlet")
public class ShoopServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        GoodDao goodDao = new GoodDao();
        String type = request.getParameter("type");
        if ("allGood".equals(type)) {
            List goodList = goodDao.allGood();
            request.setAttribute("list", goodList);
            request.getRequestDispatcher("goodIndex.jsp").forward(request, response);
        } else if ("addGood".equals(type)) {
            //获取加入购物车的商品ID
            int id = Integer.parseInt(request.getParameter("id"));
            //获取此商品
            Good good = goodDao.goodById(id);

            //获取session对象
            HttpSession session = request.getSession();
            //设置保持时间
            session.setMaxInactiveInterval(60 * 60 * 24);
            //为了关闭浏览器数据不丢失，存入cookie中
            Cookie jsessionid = new Cookie("JSESSIONID",session.getId());
            //设置cookie时效
            jsessionid.setMaxAge(60 * 60 * 24);
            response.addCookie(jsessionid);
            //容器存储商品
            List goodList = (List) session.getAttribute("list");
            if (goodList == null) {
                goodList = new ArrayList<>();
            }
            goodList.add(good);
            session.setAttribute("list", goodList);
            response.sendRedirect("shoppingCart.jsp");
        }


    }

}

$END$
<%--测试1
测试2--%>
<%--获取Cookie，必须一次性获取当前网站所有的Cookie--%>
<%
    /*Cookie[] cookies = request.getCookies();
    if (cookies!=null){
      for (Cookie cookie:cookies){
        out.println(cookie.getName()+":"+cookie.getValue());
      }
    }*/
    Object sessionAttribute = session.getAttribute("name");
    if (sessionAttribute == null) {
        response.sendRedirect("login.jsp");
    }
%>
欢迎您，${name}
退出登陆


查看所有商品

<%--
  Created by IntelliJ IDEA.
  User: xx
  Date: 2023/8/31
  Time: 18:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>


    



    
所有商品
    
            

        

            
商品名称
            
商品价格
            
操作
        
        

                
${good.name}
                
${good.price}
                
加入购物车
            
        
    
    我的购物车

<%--
  Created by IntelliJ IDEA.
  User: xx
  Date: 2023/8/31
  Time: 18:37
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>


    



    
购物车商品
    
            

        

            
商品名称
            
商品价格
        
        

                
${good.name}
                
${good.price}
            
        
    

<%--
  Created by IntelliJ IDEA.
  User: xx
  Date: 2023/8/31
  Time: 11:35
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


<%
    Cookie[] cookies = request.getCookies();
    if (cookies != null) {
        for (Cookie cookie : cookies) {
            if ("username".equals(cookie.getName())) {
                pageContext.setAttribute("username", cookie.getValue());
            }
            if ("password".equals(cookie.getName())) {
                pageContext.setAttribute("password", cookie.getValue());
            }
            /*if ("JSESSIONID".equals(cookie.getName())){
                response.sendRedirect("index.jsp");
            }*/
        }
    }
%>

    用户名：

    密码：

    <%--自动登陆--%>
    记住密码