满汉楼(Java+Mysql+Druid)_汉满楼代码

作者：知新_RL | 2024-06-14 05:48:49

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汉满楼代码

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所需文件

如果需要jar包私信我发给你

MhlView


package Mhl.view;
 
import Chat.tool.Utility;
import Mhl.daomain.*;
import Mhl.service.BillService;
import Mhl.service.DtService;
import Mhl.service.EmpService;
import Mhl.service.MenuService;
 
import java.sql.SQLException;
import java.util.List;
 
/**
 * @author whlie(true){learn}
 */
@SuppressWarnings({"all"})
public class MhlView {
    private boolean loop = true;
    //一级菜单
    private String key = "";
    //二级菜单
    private String option = "";
    //员工业务层
    private EmpService es = new EmpService();
    //餐桌业务层
    private DtService dt = new DtService();
    //菜单业务层
    private MenuService menu = new MenuService();
    //点餐业务层
    private BillService bill = new BillService();
 
 
    public static void main(String[] args) throws SQLException {
        new MhlView().mainMenu();
    }
 
    /**
     * 主菜单显示
     *
     * @throws SQLException
     */
    public void mainMenu() throws SQLException {
        while (loop) {
            System.out.println("==========满汉楼=========");
            System.out.println("\t\t1.登录满汉楼");
            System.out.println("\t\t2.退出满汉楼");
            System.out.print("请输入您的选项：");
            key = Utility.readString(1);
            switch (key) {
                case "1":
                    System.out.print("请输入员工号:");
                    String empId = Utility.readString(20);
                    System.out.print("请输入  密码:");
                    String pwd = Utility.readString(20);
                    Employee exist = es.getExist(empId, pwd);
                    //判断用户是否存在
                    if (exist != null) {
                        System.out.println("===========登录成功[" + exist.getName() + "]==========");
                        while (loop) {
                            System.out.println("===========满汉楼二级菜单==========");
                            System.out.println("\t\t1.显示餐桌的状态");
                            System.out.println("\t\t2.预定餐桌");
                            System.out.println("\t\t3.显示所有菜品");
                            System.out.println("\t\t4.点餐服务");
                            System.out.println("\t\t5.查看账单");
                            System.out.println("\t\t6.结账");
                            System.out.println("\t\t7.退出满汉楼");
                            System.out.print("请输入您的选项:");
                            option = Utility.readString(1);
                            switch (option) {
                                case "1":showDt();break;
                                case "2":orderdt();break;
                                case "3":showMenu();break;
                                case "4":order();break;
                                case "5":showBills();break;
                                case "6":payBill();break;
                                case "7":loop = false;break;
                                default:
                                    System.out.println("输入没有在选项范围内");
                            }
                        }
                    } else {
                        System.out.println("===========登录失败==========");
                    }
                case "2":loop = false;break;
                default:
                    System.out.println("输入的有问题，请重新输入");
            }
        }
        System.out.println("退出满汉楼!");
    }
 
    /**
     * 显示餐桌状态
     */
    public void showDt() throws SQLException {
        List<DiningTable> diningTables = dt.ShowState();
        System.out.println("餐桌编号" + "\t\t" + "状态");
        for (DiningTable diningTable : diningTables) {
            System.out.println(diningTable);
        }
    }
 
    /**
     * 预定餐桌
     */
    public void orderdt() throws SQLException {
        System.out.print("请输入要预定的餐桌编号(-1退出):");
        int id = Utility.readInt();
        if (id == -1) {
            return;
        }
        System.out.print("是否确定预定该餐桌(Y/N):");
        char c = Utility.readConfirmSelection();
        if (c == 'Y') {
            DiningTable exist = dt.getExist(id);
            if (exist == null) {
                System.out.println("===========该餐桌不存在==========");
                return;
            }
            if (!("空".equals(exist.getState()))) {
                System.out.println("===========该餐桌已被预定或正在就餐==========");
                return;
            }
            System.out.print("预定人姓名:");
            String name = Utility.readString(50);
            System.out.print("预定人电话");
            String tel = Utility.readString(11);
            if (dt.updateState(id, name, tel)) {
                System.out.println("===========预定成功==========");
            } else {
                System.out.println("===========预定失败==========");
            }
        } else {
            System.out.println("===========取消预定==========");
            return;
        }
    }
 
    /**
     * 显示菜单
     */
    public void showMenu() throws SQLException {
        System.out.println("编号" + "\t\t" + "名称" + "\t\t\t" + "类型" + "\t\t" + "价格");
        List<Menu> menus = menu.showMenu();
        for (Menu menu1 : menus) {
            System.out.println(menu1);
        }
    }
 
    /**
     * 点菜
     */
    public void order() throws SQLException {
        System.out.print("请输入点餐的桌号(-1退出)");
        int dt1 = Utility.readInt();
        if (dt1 == -1) {
            System.out.println("===========取消点餐==========");
            return;
        }
        System.out.print("请输入点餐的菜品号(-1退出)");
        int MenuId = Utility.readInt();
        if (MenuId == -1) {
            System.out.println("===========取消点餐==========");
            return;
        }
        System.out.print("请输入点餐的菜品量(-1退出)");
        int nums = Utility.readInt();
        if (nums == -1) {
            System.out.println("===========取消点餐==========");
            return;
        }
        DiningTable exist = dt.getExist(dt1);
        if (exist == null) {
            System.out.println("===========餐桌不存在==========");
            return;
        }
        Menu menu = this.menu.getMenu(MenuId);
        if (menu == null) {
            System.out.println("===========菜品不存在==========");
            return;
        }
        if (bill.orderMenu(MenuId, nums, dt1)) {
            System.out.println("===========点餐成功==========");
            return;
        } else {
            System.out.println("===========点餐失败==========");
            return;
        }
    }
 
    /**
     * 显示账单
     */
    public void showBill() throws SQLException {
        System.out.println("\n编号\t\t菜品号\t\t菜品量\t\t金额\t\t\t桌号\t\t日期\t\t\t\t\t\t\t状态");
        List<Bill> bills = bill.showBill();
        for (Bill bill1 : bills) {
            System.out.println(bill1);
        }
    }
 
    /**
     * 显示账单(多表)
     */
    public void showBills() throws SQLException {
        System.out.println("\n编号\t\t菜品号\t\t菜品量\t\t金额\t\t\t桌号\t\t日期\t\t\t\t\t\t\t状态\t\t菜品名称");
        List<Multiple> multiples = bill.showBills();
        for (Multiple bill1 : multiples) {
            System.out.println(bill1);
        }
    }
 
    /**
     * 结账
     */
    public void payBill() throws SQLException {
        System.out.print("请输入要结账的餐桌号(-1退出)");
        int dt1 = Utility.readInt();
        if (dt1 == -1) {
            System.out.println("===========取消结账==========");
            return;
        }
        DiningTable exist = dt.getExist(dt1);
        if (exist == null) {
            System.out.println("===========餐桌不存在==========");
            return;
        }
        if (!bill.judge(dt1)) {
            System.out.println("===========该餐桌没有账单==========");
            return;
        }
        System.out.print("请输入结账方式(回车退出)");
        String payMode = Utility.readString(20, "");
        if ("".equals(payMode)) {
            System.out.println("===========取消结账==========");
            return;
        }
        if (bill.payBill(dt1, payMode)) {
            System.out.println("===========结账成功==========");
        } else {
            System.out.println("===========结账失败==========");
        }
    }
}

BasicDAO


package Mhl.dao;
 
import JDBC.Tool.DruTool;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
 
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
 
/**
 * @author whlie(true){learn}
 */
public class BasicDAO<T> {
    /**
     * 封装常用的各种方法
     * @param <T>类型不确定
     */
    private QueryRunner qr = new QueryRunner();
        public int update(String sql,Object... parameters) throws SQLException {
            Connection connection =  DruTool.getConnection();
            int update = qr.update(connection, sql, parameters);
            DruTool.close(null,null,connection);
            return update;
        }
 
        /**
         * 返回多个对象(即查询的结果是多行), 针对任意表
         * @param sql sql 语句，可以有 ?
         * @param clazz  传入一个类的 Class 对象 比如 Actor.class
         * @param parameters 传入 ? 的具体的值，可以是多个
         * @return 根据 Actor.class 返回对应的 ArrayList 集合
         */
        public List<T> queryMulti(String sql, Class<T> clazz, Object... parameters) throws SQLException {
            Connection connection = DruTool.getConnection();
            List<T> list = qr.query(connection, sql, new BeanListHandler<T>(clazz), parameters);
            DruTool.close(null,null,connection);
            return list;
        }
 
        /**
         * 查询单行结果 的通用方法
         * @param sql
         * @param clazz
         * @param parameters
         * @return
         */
        public T querySingle(String sql, Class<T> clazz, Object... parameters) throws SQLException {
                Connection connection = DruTool.getConnection();
                T query = qr.query(connection, sql, new BeanHandler<T>(clazz), parameters);
                DruTool.close(null,null,connection);
                return query;
        }
        /**
         *返回单值的方法
         * @param sql
         * @param parameters
         * @return
         */
        public Object queryScalar(String sql, Object... parameters) throws SQLException {
            Connection connection = DruTool.getConnection();
            Object query = qr.query(connection, sql, new ScalarHandler(), parameters);
            DruTool.close(null,null,connection);
            return query;
        }
}

BillDAO


package Mhl.dao;
 
import Mhl.daomain.Bill;
 
/**
 * @author whlie(true){learn}
 */
public class BillDAO extends BasicDAO<Bill>{
}

dao包下的其他文件和BillDAO类似只是名字不同

BillService


package Mhl.service;
 
import Mhl.dao.BillDAO;
import Mhl.dao.MultipleDAO;
import Mhl.daomain.Bill;
import Mhl.daomain.Multiple;
 
import java.sql.SQLException;
import java.util.List;
import java.util.UUID;
 
/**
 * @author whlie(true){learn}
 */
public class BillService {
    private BillDAO ba=new BillDAO();
    private MenuService ms=new MenuService();
    private DtService dts=new DtService();
    //多表查询
    private MultipleDAO mp=new MultipleDAO();
 
    /**
     * 点菜
     * 生成账单
     * 更新餐桌状态
     */
    public boolean orderMenu(int menuId,int nums,int diningTable) throws SQLException {
        //生成随机账单号
        String billId = UUID.randomUUID().toString();
 
        //从菜单业务层根据菜单id获取到对应菜品的价格
        int update = ba.update("insert into bill values(null,?,?,?,?,?,now(),'未结账')",
                billId, menuId, nums, ms.getMenu(menuId).getPrice() * nums, diningTable);
        if (update<=0){
            return false;
        }
        return dts.updateState(diningTable,"就餐中");
    }
 
    /**
     * 返回所有账单(单表)
     */
    public List<Bill> showBill() throws SQLException {
        return ba.queryMulti("select *from bill",Bill.class);
    }
 
    /**
     * 返回所有账单(多表)
     * @return
     */
    public List<Multiple> showBills() throws SQLException {
        return mp.queryMulti("select bill.*,name from bill,Menu where bill.menuId=Menu.id", Multiple.class);
    }
 
    /**
     * 判断某张餐桌是否有未结账的账单
     */
    public boolean judge(int diningTable) throws SQLException {
        Bill bill = ba.querySingle("select *from bill where diningTable=? and state='未结账' limit 0,1", Bill.class, diningTable);
        return bill!=null;
    }
    /**
     * 完成结账
     */
    public boolean payBill(int diningTable,String payMode) throws SQLException {
        //修改bill表的状态
        int update = ba.update("update bill set state=? where diningTable=? and state='未结账'", payMode, diningTable);
        if (update<=0){
            return false;
        }
        //将对应的餐桌置空
        if (!dts.ToNull(diningTable,"空")){
            return false;
        }
        return true;
    }
}

DtService


package Mhl.service;
 
import Mhl.dao.DiningTableDAO;
import Mhl.daomain.DiningTable;
 
import java.sql.SQLException;
import java.util.List;
 
/**
 * @author whlie(true){learn}
 */
public class DtService {
    private DiningTableDAO dt=new DiningTableDAO();
 
    /**
     * 显示全部餐桌的状态
     */
    public List<DiningTable> ShowState() throws SQLException {
        return dt.queryMulti("select id,state from diningTable",DiningTable.class);
    }
 
    /**
     * 查找餐桌是否存在
     */
    public DiningTable getExist(int id) throws SQLException {
        return dt.querySingle("select *from diningTable where id=?",DiningTable.class,id);
    }
 
    /**
     * 如果餐桌可以预定则更新状态
     */
    public boolean updateState(int id,String ordername,String ordertel) throws SQLException {
        int update = dt.update("update diningTable set state='已预定',ordername=?,ordertel=? where id=?", ordername, ordertel, id);
        return update>0;
    }
 
    /**
     * 提供一个更新餐桌状态的方法
     */
    public boolean updateState(int id,String state) throws SQLException {
        int update = dt.update("update diningTable set state=? where id=?", state, id);
        return update>0;
    }
 
    /**
     * 将指定餐桌置空
     */
    public boolean ToNull(int id,String state) throws SQLException {
        int update = dt.update("update diningTable set state=?,ordername='',ordertel='' where id=?", state, id);
        return update>0;
    }
}

EmpService


package Mhl.service;
 
import Mhl.dao.EmployeeDAO;
import Mhl.daomain.Employee;
 
import java.sql.SQLException;
 
/**
 * @author whlie(true){learn}
 */
public class EmpService {
    private EmployeeDAO emp=new EmployeeDAO();
    public Employee getExist(String empId,String pwd) throws SQLException {
        //因为使用了MD5加密所以pwd=MD5(?)
        return emp.querySingle("select *from employee where empId=? and pwd=MD5(?)",Employee.class,empId,pwd);
    }
}

MenuService


package Mhl.service;
 
import Mhl.dao.MenuDAO;
import Mhl.daomain.Menu;
 
import java.sql.SQLException;
import java.util.List;
 
/**
 * @author whlie(true){learn}
 */
public class MenuService {
    MenuDAO menu=new MenuDAO();
 
    /**
     * 返回所有菜品
     */
    public List<Menu> showMenu() throws SQLException {
        return menu.queryMulti("SELECT *from Menu",Menu.class);
    }
 
    /**
     *根据id返回Menu对象
     */
    public Menu getMenu(int id) throws SQLException {
        return menu.querySingle("select *from Menu where id=?",Menu.class,id);
    }
}

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