JavaStudy12(27章-满汉楼)—B站hsp

1.程序框架图

2 代码演示

2.1 DAO层

package com.qinbo.mhl.dao;import com.qinbo.mhl.utils.JDBCUtilsByDruid;
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 韩顺平* @version 1.0 * 开发BasicDAO , 是其他DAO的父类*/
public class BasicDAO<T> { //泛型指定具体类型private QueryRunner qr =  new QueryRunner();//开发通用的dml方法, 针对任意的表public int update(String sql, Object... parameters) {Connection connection = null;try {connection = JDBCUtilsByDruid.getConnection();int update = qr.update(connection, sql, parameters);return  update;} catch (SQLException e) {throw  new RuntimeException(e); //将编译异常->运行异常 ,抛出} finally {JDBCUtilsByDruid.close(null, null, connection);}}//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) {Connection connection = null;try {connection = JDBCUtilsByDruid.getConnection();return qr.query(connection, sql, new BeanListHandler<T>(clazz), parameters);} catch (SQLException e) {throw  new RuntimeException(e); //将编译异常->运行异常 ,抛出} finally {JDBCUtilsByDruid.close(null, null, connection);}}//查询单行结果 的通用方法public T querySingle(String sql, Class<T> clazz, Object... parameters) {Connection connection = null;try {connection = JDBCUtilsByDruid.getConnection();return  qr.query(connection, sql, new BeanHandler<T>(clazz), parameters);} catch (SQLException e) {throw  new RuntimeException(e); //将编译异常->运行异常 ,抛出} finally {JDBCUtilsByDruid.close(null, null, connection);}}//查询单行单列的方法,即返回单值的方法public Object queryScalar(String sql, Object... parameters) {Connection connection = null;try {connection = JDBCUtilsByDruid.getConnection();return  qr.query(connection, sql, new ScalarHandler(), parameters);} catch (SQLException e) {throw  new RuntimeException(e); //将编译异常->运行异常 ,抛出} finally {JDBCUtilsByDruid.close(null, null, connection);}}}

package com.qinbo.mhl.dao;import com.qinbo.mhl.domain.Bill;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.dao* @Author: 别来无恙qb* @CreateTime: 2022-05-28  21:17* @Description:*/
public class BillDAO extends BasicDAO<Bill>{}

package com.qinbo.mhl.dao;import com.qinbo.mhl.domain.DiningTable;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.dao* @Author: 别来无恙qb* @CreateTime: 2022-05-24  21:35* @Description:*/
public class DiningTableDAO extends BasicDAO<DiningTable>{}

package com.qinbo.mhl.dao;import com.qinbo.mhl.domain.Employee;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.dao* @Author: 别来无恙qb* @CreateTime: 2022-05-23  22:30* @Description: 这是操作数据库Employee的DAO层*/
public class EmployeeDAO extends BasicDAO<Employee>{}

package com.qinbo.mhl.dao;import com.qinbo.mhl.domain.Menu;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.dao* @Author: 别来无恙qb* @CreateTime: 2022-05-26  21:18* @Description:*/
public class MenuDAO extends BasicDAO<Menu>{}

package com.qinbo.mhl.dao;import com.qinbo.mhl.domain.MultiTableBean;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.dao* @Author: 别来无恙qb* @CreateTime: 2022-05-29  18:39* @Description:*/
public class MultiTableDAO extends BasicDAO<MultiTableBean>{}

2.2 domain

package com.qinbo.mhl.domain;import java.util.Date;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.domain* @Author: 别来无恙qb* @CreateTime: 2022-05-28  20:53* @Description: #增加表 bill 账单表(id, billId, menuId, nums, billDate, money, state, diningTableId )* #账单流水, 考虑可以分开结账, 并考虑将来分别统计各个不同菜品的销售情况* CREATE TABLE bill (* id INT PRIMARY KEY AUTO_INCREMENT, #自增主键* billId VARCHAR(50) NOT NULL DEFAULT '',#账单号可以按照自己规则生成 UUID* menuId INT NOT NULL DEFAULT 0,#菜品的编号, 也可以使用外键* nums INT NOT NULL DEFAULT 0,#份数* money DOUBLE NOT NULL DEFAULT 0, #金额* diningTableId INT NOT NULL DEFAULT 0, #餐桌* billDate DATETIME NOT NULL ,#订单日期* state VARCHAR(50) NOT NULL DEFAULT '' # 状态 '未结账' , '已经结账', '挂单','现金','支付宝','坏账'* )CHARSET=utf8;*/
public class Bill {private Integer id;private String billId;private Integer menuId;private Integer nums;private Double money;private Integer diningTableId;private Date billDate;private String state;public Bill() {}public Bill(Integer id, String billId, Integer menuId, Integer nums, Double money, Integer diningTableId, Date billDate, String state) {this.id = id;this.billId = billId;this.menuId = menuId;this.nums = nums;this.money = money;this.diningTableId = diningTableId;this.billDate = billDate;this.state = state;}@Overridepublic String toString() {return id +"\t\t" + menuId +"\t\t\t" + nums +"\t\t\t" + money +"\t" + diningTableId +"\t\t" + billDate +"\t\t" + state;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getBillId() {return billId;}public void setBillId(String billId) {this.billId = billId;}public Integer getMenuId() {return menuId;}public void setMenuId(Integer menuId) {this.menuId = menuId;}public Integer getNums() {return nums;}public void setNums(Integer nums) {this.nums = nums;}public Double getMoney() {return money;}public void setMoney(Double money) {this.money = money;}public Integer getDiningTableId() {return diningTableId;}public void setDiningTableId(Integer diningTableId) {this.diningTableId = diningTableId;}public Date getBillDate() {return billDate;}public void setBillDate(Date billDate) {this.billDate = billDate;}public String getState() {return state;}public void setState(String state) {this.state = state;}
}

package com.qinbo.mhl.domain;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.domain* @Author: 别来无恙qb* @CreateTime: 2022-05-24  21:35* @Description:这是一个javabean 和 diningTable 表对应*  *  id int primary key auto_increment, #自增, 表示餐桌编号*  *  state varchar(20) not null default '',#餐桌的状态*  *  orderName varchar(50) not null default '',#预订人的名字*  *  orderTel varchar(20) not null default ''*/
public class DiningTable {private Integer id;private String state;private String orderName;private String orderTel;public DiningTable() {}public DiningTable(Integer id, String state, String orderName, String orderTel) {this.id = id;this.state = state;this.orderName = orderName;this.orderTel = orderTel;}@Overridepublic String toString() {return id + "\t\t\t" + state;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getState() {return state;}public void setState(String state) {this.state = state;}public String getOrderName() {return orderName;}public void setOrderName(String orderName) {this.orderName = orderName;}public String getOrderTel() {return orderTel;}public void setOrderTel(String orderTel) {this.orderTel = orderTel;}
}

package com.qinbo.mhl.domain;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.domain* @Author: 别来无恙qb* @CreateTime: 2022-05-23  22:27* @Description: 这是一个javabean 和 employee对应* id int primary key auto_increment, #自增* empId varchar(50) not null default '',#员工号* pwd char(32) not null default '',#密码md5* name varchar(50) not null default '',#姓名* job varchar(50) not null default '' #岗位*/
public class Employee {private Integer id;private String empId;private String pwd;private String name;private String job;public Employee() {}public Employee(int id, String empId, String pwd, String name, String job) {this.id = id;this.empId = empId;this.pwd = pwd;this.name = name;this.job = job;}@Overridepublic String toString() {return "Employee{" +"id=" + id +", empId='" + empId + '\'' +", pwd='" + pwd + '\'' +", name='" + name + '\'' +", job='" + job + '\'' +'}';}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getEmpId() {return empId;}public void setEmpId(String empId) {this.empId = empId;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getJob() {return job;}public void setJob(String job) {this.job = job;}
}

package com.qinbo.mhl.domain;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.domain* @Author: 别来无恙qb* @CreateTime: 2022-05-26  21:18* @Description: -- 创建menu表(id, name, type, price)* #菜谱* CREATE TABLE menu (*     id INT PRIMARY KEY AUTO_INCREMENT, #自增主键，作为菜谱编号(唯一)*     NAME VARCHAR(50) NOT NULL DEFAULT '',#菜品名称*     TYPE VARCHAR(50) NOT NULL DEFAULT '', #菜品种类*     price DOUBLE NOT NULL DEFAULT 0#价格* )CHARSET=utf8;*/
public class Menu {private Integer id;private String name;private String type;private double price;public Menu() {}public Menu(Integer id, String name, String type, double price) {this.id = id;this.name = name;this.type = type;this.price = price;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getType() {return type;}public void setType(String type) {this.type = type;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}@Overridepublic String toString() {return id + "\t\t\t" + name + "\t\t" + type + "\t\t" + price;}
}

package com.qinbo.mhl.domain;import java.util.Date;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.domain* @Author: 别来无恙qb* @CreateTime: 2022-05-29  17:44* @Description: 这是一个javabean 可以和多张表进行对应*/
public class MultiTableBean {private Integer id;private String billId;private Integer menuId;private Integer nums;private Double money;private Integer diningTableId;private Date billDate;private String state;//增加一个来自menu表的列 name//思考 这里的属性名是否一定要和表的列名保持一致.//答: 可以不一致，但是需要sql做相应的修改, 规范需要保持一致.private String name;//增加来自menu表的列 priceprivate Double price;public MultiTableBean() {}/*public MultiTableBean(Integer id, String billId, Integer menuId, Integer nums, Double money, Integer diningTableId, Date billDate, String state, String name, Double price) {this.id = id;this.billId = billId;this.menuId = menuId;this.nums = nums;this.money = money;this.diningTableId = diningTableId;this.billDate = billDate;this.state = state;this.name = name;this.price = price;}*/@Overridepublic String toString() {return id +"\t\t" + menuId +"\t\t\t" + nums +"\t\t\t" + money +"\t" + diningTableId +"\t\t" + billDate +"\t\t" + state +"\t\t" + name +"\t\t" + price;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getBillId() {return billId;}public void setBillId(String billId) {this.billId = billId;}public Integer getMenuId() {return menuId;}public void setMenuId(Integer menuId) {this.menuId = menuId;}public Integer getNums() {return nums;}public void setNums(Integer nums) {this.nums = nums;}public Double getMoney() {return money;}public void setMoney(Double money) {this.money = money;}public Integer getDiningTableId() {return diningTableId;}public void setDiningTableId(Integer diningTableId) {this.diningTableId = diningTableId;}public Date getBillDate() {return billDate;}public void setBillDate(Date billDate) {this.billDate = billDate;}public String getState() {return state;}public void setState(String state) {this.state = state;}public String getName() {return name;}public void setName(String name) {this.name = name;}//给price生成setter 和 getterpublic Double getPrice() {return price;}public void setPrice(Double price) {this.price = price;}
}

2.3 service

package com.qinbo.mhl.service;import com.qinbo.mhl.dao.BillDAO;
import com.qinbo.mhl.dao.MenuDAO;
import com.qinbo.mhl.dao.MultiTableDAO;
import com.qinbo.mhl.domain.Bill;
import com.qinbo.mhl.domain.Menu;
import com.qinbo.mhl.domain.MultiTableBean;import java.util.List;
import java.util.UUID;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.service* @Author: 别来无恙qb* @CreateTime: 2022-05-28  21:23* @Description: 处理和账单相关的业务逻辑*/
public class BillService {//定义一个BillDAO账单属性private BillDAO billDAO = new BillDAO();//定义一个MenuDAO菜单属性private MenuService menuService = new MenuService();//定义一个DiningTableService 餐桌属性private DiningTableService diningTableService = new DiningTableService();//定义一个 MultiTableDAO 联合表属性private MultiTableDAO multiTableDAO = new MultiTableDAO();//编写点餐的方法//1. 生成账单//2. 需要更新对应餐桌的状态//3. 如果成功返回true, 否则返回falsepublic boolean updateBill(int menuId, int nums, int diningTableId) {String billId = UUID.randomUUID().toString();int update = billDAO.update("insert into bill values (null, ?,?,?,?,?,now(),'未结账' )",billId, menuId, nums, menuService.getMenuById(menuId).getPrice() * nums, diningTableId);if (update <= 0) {return false;}//订餐成功，修改餐桌状态return diningTableService.updateDiningTableState(diningTableId, "就餐中");}//返回所有的账单， 提供给View调用public List<Bill> showBillList() {return billDAO.queryMulti("select * from bill", Bill.class);}//返回所有的账单， 提供给View调用public List<MultiTableBean> showBillList2() {return multiTableDAO.queryMulti("SELECT bill.*, NAME,price " +"FROM bill, menu "+"WHERE bill.menuId = menu.id", MultiTableBean.class);}//查看某个餐桌是否有未结账的账单public boolean hasPayBillByDiningTableId(int diningTableId) {//LIMIT 0, 1 表示有一条信息就证明有未结账的账单Bill bill = billDAO.querySingle("SELECT * FROM bill WHERE diningTableId=? AND state = '未结账' LIMIT 0, 1", Bill.class, diningTableId);return bill != null;}//完成结账[如果餐桌存在，并且该餐桌有未结账的账单]//如果成功，返回true, 失败返回 falsepublic boolean payBill(int diningTableId, String payMode) {//如果这里使用事务的话，需要用ThreadLocal来解决 , 框架中比如mybatis 提供了事务支持//1. 修改bill表int update = billDAO.update("update bill set state = ? where diningTableId = ? and state = '未结账'", payMode, diningTableId);if (update <= 0) {return false;//如果更新没有成功，则表示失败...}//2. 修改diningTable表//注意：不要直接在这里操作，而应该调用DiningTableService 方法,完成更新，体现各司其职if (!diningTableService.updateDiningTableToFree(diningTableId)) {return false;}return true;}
}

package com.qinbo.mhl.service;import com.qinbo.mhl.dao.DiningTableDAO;
import com.qinbo.mhl.domain.DiningTable;
import org.apache.commons.dbutils.handlers.BeanListHandler;import java.util.List;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.service* @Author: 别来无恙qb* @CreateTime: 2022-05-24  21:36* @Description:*/
public class DiningTableService {//定义一个 DiningTableDAO属性private DiningTableDAO diningTableDAO = new DiningTableDAO();//返回所有餐桌的信息public List<DiningTable> tableList() {return diningTableDAO.queryMulti("select id,state from diningTable ", DiningTable.class);}//返回预定餐桌信息public DiningTable getDiningTableById(int id) {//根据id , 查询对应的餐桌DiningTable 对象//,如果返回null , 表示id编号对应的餐桌不存在return diningTableDAO.querySingle("SELECT * FROM diningTable WHERE id = ? ", DiningTable.class, id);}//如果餐桌可以预定，调用方法，对其状态进行更新(包括预定人的名字和电话)public boolean orderDiningTable(int orderId, String orderName, String orderTel) {int update =diningTableDAO.update("UPDATE diningTable SET state='已经预定', orderName=?, orderTel=? WHERE id=?",orderName, orderTel, orderId);return update > 0;}//更新餐桌状态public boolean updateDiningTableState(int id, String state) {int update = diningTableDAO.update("UPDATE diningTable SET state= ? WHERE id=?", state, id);return update > 0;}//提供方法，将指定的餐桌设置为空闲状态public boolean updateDiningTableToFree(int id) {int update = diningTableDAO.update("update diningTable set state = '空',orderName = '',orderTel = '' where id = ?",id);return update > 0;}}

package com.qinbo.mhl.service;import com.qinbo.mhl.dao.EmployeeDAO;
import com.qinbo.mhl.domain.Employee;
import org.apache.commons.dbutils.handlers.BeanHandler;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.service* @Author: 别来无恙qb* @CreateTime: 2022-05-23  22:31* @Description: 该类完成对employee表的各种操作(通过调用EmployeeDAO对象完成)*/
public class EmployeeService {//定义一个 EmployeeDAO 属性private EmployeeDAO employeeDAO = new EmployeeDAO();//方法，根据empId 和 pwd 返回一个Employee对象//如果查询不到，就返回nullpublic Employee getEmployeeByIdAndPwd(String empId, String pwd){return employeeDAO.querySingle("select * from employee where empId=? and pwd=md5(?)",Employee.class,empId,pwd );}}

package com.qinbo.mhl.service;import com.qinbo.mhl.dao.MenuDAO;
import com.qinbo.mhl.domain.Menu;import java.util.List;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.service* @Author: 别来无恙qb* @CreateTime: 2022-05-26  21:21* @Description:*/
public class MenuService {private MenuDAO menuDAO = new MenuDAO();//获取菜单数据 返回所有的菜品, 返回给界面使用public List<Menu> menuList(){return menuDAO.queryMulti("select * from menu",Menu.class);}//根据id, 返回Menu对象public Menu getMenuById(int id){return menuDAO.querySingle("select * from menu where id = ?",Menu.class,id);}
}

2.4utils

package com.qinbo.mhl.utils;import com.alibaba.druid.pool.DruidDataSourceFactory;import javax.sql.DataSource;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;/*** @author 韩顺平* @version 1.0* 基于druid数据库连接池的工具类*/
public class JDBCUtilsByDruid {private static DataSource ds;//在静态代码块完成 ds初始化static {Properties properties = new Properties();try {properties.load(new FileInputStream("src\\druid.properties"));ds = DruidDataSourceFactory.createDataSource(properties);} catch (Exception e) {e.printStackTrace();}}//编写getConnection方法public static Connection getConnection() throws SQLException {return ds.getConnection();}//关闭连接, 老师再次强调： 在数据库连接池技术中，close 不是真的断掉连接//而是把使用的Connection对象放回连接池public static void close(ResultSet resultSet, Statement statement, Connection connection) {try {if (resultSet != null) {resultSet.close();}if (statement != null) {statement.close();}if (connection != null) {connection.close();}} catch (SQLException e) {throw new RuntimeException(e);}}
}

package com.qinbo.mhl.utils;import java.sql.Connection;
import java.sql.SQLException;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.utils* @Author: 别来无恙qb* @CreateTime: 2022-05-23  21:13* @Description:*/
public class Test {public static void main(String[] args) throws SQLException {//测试UtilitySystem.out.println("请输入一个整数：");int i = Utility.readInt();System.out.println("i=" + i);//测试JDBCUtilsByDruidConnection connection = JDBCUtilsByDruid.getConnection();System.out.println(connection);}}

package com.qinbo.mhl.utils;/**工具类的作用:处理各种情况的用户输入，并且能够按照程序员的需求，得到用户的控制台输入。
*/import java.util.*;
/***/
public class Utility {//静态属性。。。private static Scanner scanner = new Scanner(System.in);/*** 功能：读取键盘输入的一个菜单选项，值：1——5的范围* @return 1——5*/public static char readMenuSelection() {char c;for (; ; ) {String str = readKeyBoard(1, false);//包含一个字符的字符串c = str.charAt(0);//将字符串转换成字符char类型if (c != '1' && c != '2' && c != '3' && c != '4' && c != '5') {System.out.print("选择错误，请重新输入：");} else break;}return c;}/*** 功能：读取键盘输入的一个字符* @return 一个字符*/public static char readChar() {String str = readKeyBoard(1, false);//就是一个字符return str.charAt(0);}/*** 功能：读取键盘输入的一个字符，如果直接按回车，则返回指定的默认值；否则返回输入的那个字符* @param defaultValue 指定的默认值* @return 默认值或输入的字符*/public static char readChar(char defaultValue) {String str = readKeyBoard(1, true);//要么是空字符串，要么是一个字符return (str.length() == 0) ? defaultValue : str.charAt(0);}/*** 功能：读取键盘输入的整型，长度小于2位* @return 整数*/public static int readInt() {int n;for (; ; ) {String str = readKeyBoard(2, false);//一个整数，长度<=2位try {n = Integer.parseInt(str);//将字符串转换成整数break;} catch (NumberFormatException e) {System.out.print("数字输入错误，请重新输入：");}}return n;}/*** 功能：读取键盘输入的 整数或默认值，如果直接回车，则返回默认值，否则返回输入的整数* @param defaultValue 指定的默认值* @return 整数或默认值*/public static int readInt(int defaultValue) {int n;for (; ; ) {String str = readKeyBoard(10, true);if (str.equals("")) {return defaultValue;}//异常处理...try {n = Integer.parseInt(str);break;} catch (NumberFormatException e) {System.out.print("数字输入错误，请重新输入：");}}return n;}/*** 功能：读取键盘输入的指定长度的字符串* @param limit 限制的长度* @return 指定长度的字符串*/public static String readString(int limit) {return readKeyBoard(limit, false);}/*** 功能：读取键盘输入的指定长度的字符串或默认值，如果直接回车，返回默认值，否则返回字符串* @param limit 限制的长度* @param defaultValue 指定的默认值* @return 指定长度的字符串*/public static String readString(int limit, String defaultValue) {String str = readKeyBoard(limit, true);return str.equals("")? defaultValue : str;}/*** 功能：读取键盘输入的确认选项，Y或N* 将小的功能，封装到一个方法中.* @return Y或N*/public static char readConfirmSelection() {System.out.println("确认是否预订(Y/N):");char c;for (; ; ) {//无限循环//在这里，将接受到字符，转成了大写字母//y => Y n=>NString str = readKeyBoard(1, false).toUpperCase();c = str.charAt(0);if (c == 'Y' || c == 'N') {break;} else {System.out.print("选择错误，请重新输入：");}}return c;}/*** 功能： 读取一个字符串* @param limit 读取的长度* @param blankReturn 如果为true ,表示 可以读空字符串。 *                   如果为false表示 不能读空字符串。*           * 如果输入为空，或者输入大于limit的长度，就会提示重新输入。* @return*/private static String readKeyBoard(int limit, boolean blankReturn) {//定义了字符串String line = "";//scanner.hasNextLine() 判断有没有下一行while (scanner.hasNextLine()) {line = scanner.nextLine();//读取这一行//如果line.length=0, 即用户没有输入任何内容，直接回车if (line.length() == 0) {if (blankReturn) return line;//如果blankReturn=true,可以返回空串else continue; //如果blankReturn=false,不接受空串，必须输入内容}//如果用户输入的内容大于了 limit，就提示重写输入  //如果用户如的内容 >0 <= limit ,我就接受if (line.length() < 1 || line.length() > limit) {System.out.print("输入长度（不能大于" + limit + "）错误，请重新输入：");continue;}break;}return line;}
}

2.5 view

package com.qinbo.mhl.view;import com.qinbo.mhl.domain.*;
import com.qinbo.mhl.service.BillService;
import com.qinbo.mhl.service.DiningTableService;
import com.qinbo.mhl.service.EmployeeService;
import com.qinbo.mhl.service.MenuService;
import com.qinbo.mhl.utils.Utility;import java.util.List;/*** @BelongsProject: mhl* @BelongsPackage: com.qinbo.mhl.view* @Author: 别来无恙qb* @CreateTime: 2022-05-23  21:18* @Description: 满汉楼主界面*/
public class MHLView {//控制是否退出菜单private boolean loop = true;private String key = "";//定义EmployeeService 属性private EmployeeService employeeService = new EmployeeService();//定义 DiningTableService属性private DiningTableService diningTableService = new DiningTableService();//定义 MenuServiceprivate MenuService menuService = new MenuService();//定义 BillService属性private BillService billService = new BillService();public static void main(String[] args) {MHLView mhlView = new MHLView();mhlView.mainView();}//完成预定餐桌public void orderDiningTable() {System.out.println("==============预定餐桌============");System.out.print("请选择要预定的餐桌编号(-1退出): ");int orderId = Utility.readInt();//判断orderId是否为-1 是就退出if (orderId == -1) {return;}char key = Utility.readConfirmSelection();if (key == 'Y') { // 确认预定DiningTable diningTableById = diningTableService.getDiningTableById(orderId);//根据orderId 返回 对应DiningTable对象, 如果为null, 说明该对象不存在if (diningTableById == null) { //如果为null, 说明该对象不存在, 就是没有查出来System.out.println("==============预订餐桌不存在============");return;}//判断该餐桌的状态是否 "空"if (!(diningTableById.getState().equals("空"))) {//说明当前这个餐桌不是 "空" 状态System.out.println("==============该餐桌已经预定或者就餐中============");return;}System.out.print("预定人的名字: ");String orderName = Utility.readString(50);System.out.print("预定人的电话: ");String orderTel = Utility.readString(50);//修改餐桌状态if (diningTableService.orderDiningTable(orderId,orderName,orderTel)){System.out.println("==============预订餐桌成功============");}else {System.out.println("==============预订餐桌失败============");}}else {System.out.println("==============取消预订餐桌============");}}//显示所有餐桌状态public void listDiningTable() {List<DiningTable> diningTables = diningTableService.tableList();System.out.println("\n餐桌编号\t\t餐桌状态");for (DiningTable diningTable : diningTables) {System.out.println(diningTable);}System.out.println("==============显示完毕============");}//listMenu 显示菜单public void listMenu(){List<Menu> menuList = menuService.menuList();System.out.println("\n菜品编号\t\t菜品名\t\t类别\t\t价格");for (Menu menu : menuList) {System.out.println(menu);}System.out.println("==============显示完毕============");}//完成点餐public void orderMenu(){System.out.println("==============点餐服务============");System.out.print("请输入点餐的桌号(-1退出): ");int orderDiningTableId = Utility.readInt();if(orderDiningTableId ==-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 orderMenuId = Utility.readInt();if (orderMenuId == -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 orderNums = Utility.readInt();if (orderNums == -1) {System.out.println("==============取消点餐============");return;}//验证餐桌是否存在DiningTable diningTableById = diningTableService.getDiningTableById(orderDiningTableId);if (diningTableById == null){System.out.println("==============餐桌号不存在============");return;}//验证菜品是否存在Menu menuById = menuService.getMenuById(orderMenuId);if (menuById == null){System.out.println("==============菜品不存在============");return;}//更新餐桌状态if (billService.updateBill(orderMenuId,orderNums,orderDiningTableId)) {System.out.println("==============点餐成功============");}else {System.out.println("==============点餐失败============");}}//显示账单public void showBillList2(){/*List<Bill> showBillList = billService.showBillList();System.out.println("\n编号\t\t菜品号\t\t菜品量\t\t金额\t\t桌号\t\t日期\t\t\t\t\t\t\t状态");for (Bill bill : showBillList) {System.out.println(bill);}System.out.println("==============显示完毕============");*/List<MultiTableBean> multiTableBeans = billService.showBillList2();System.out.println("\n编号\t\t菜品号\t\t菜品量\t\t金额\t\t桌号\t\t日期\t\t\t\t\t\t\t状态\t\t菜品名\t\t价格");for (MultiTableBean bill : multiTableBeans) {System.out.println(bill);}System.out.println("==============显示完毕============");}//结账public void payBill(){System.out.println("==============结账服务============");System.out.print("请选择要结账的餐桌编号(-1退出): ");int diningTableId = Utility.readInt();if (diningTableId == -1) {System.out.println("=============取消结账============");return;}//对餐桌进行校验DiningTable diningTableById = diningTableService.getDiningTableById(diningTableId);if (diningTableById == null){System.out.println("=============结账的餐桌不存在============");return;}//验证餐桌是否有需要结账的账单if (!billService.hasPayBillByDiningTableId(diningTableId)) {System.out.println("=============该餐位没有未结账账单============");return;}System.out.print("结账方式(现金/支付宝/微信)回车表示退出: ");String payMode = Utility.readString(20, "");//说明如果回车，就是返回 ""if ("".equals(payMode)) {System.out.println("=============取消结账============");return;}char key = Utility.readConfirmSelection();if (key == 'Y' || key == 'y') { //结账//调用我们写的方法if (billService.payBill(diningTableId, payMode)) {System.out.println("=============完成结账============");}else {System.out.println("=============结账失败============");}}else {System.out.println("=============取消结账============");}}//显示主菜单public void mainView() {while (loop) {System.out.println("\n===============满汉楼================");System.out.println("\t\t 1 登录满汉楼");System.out.println("\t\t 2 退出满汉楼");System.out.print("请输入你的选择: ");key = Utility.readString(1);switch (key) {case "1":System.out.println("请输入员工号");String id = Utility.readString(50);System.out.println("请输入密码");String pwd = Utility.readString(50);Employee employee = employeeService.getEmployeeByIdAndPwd(id, pwd);if (employee != null) {System.out.println("===============登录成功[" + employee.getName() + "]================\n");//显示二级菜单，这里二级菜单是循环操作，所以做成whilewhile (loop) {System.out.println("\n===============满汉楼(二级菜单)================");System.out.println("\t\t 1 显示餐桌状态");System.out.println("\t\t 2 预定餐桌");System.out.println("\t\t 3 显示所有菜品");System.out.println("\t\t 4 点餐服务");System.out.println("\t\t 5 查看账单");System.out.println("\t\t 6 结账");System.out.println("\t\t 9 退出满汉楼");System.out.print("请输入你的选择: ");key = Utility.readString(1);switch (key) {case "1":listDiningTable();//显示餐桌状态break;case "2":orderDiningTable();//预定餐桌System.out.println("预定餐桌");break;case "3":listMenu(); //显示菜单System.out.println("显示所有菜品");break;case "4":orderMenu();System.out.println("点餐服务");break;case "5":showBillList2();//显示账单System.out.println("查看账单");break;case "6":payBill();System.out.println("结账");break;case "9":System.out.println("退出满汉楼");loop = false;break;default:System.out.println("输入有误，重新输入");}}} else {System.out.println("==============登陆失败===============");}break;case "2":System.out.println("退出满汉楼");loop = false;break;default:System.out.println("输入有误，重新输入");}}System.out.println("已退出满汉楼");}
}

2.6 properties

#key=value
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mhl?rewriteBatchedStatements=true
#url=jdbc:mysql://localhost:3306/girls
username=root
password=root
#initial connection Size 初始
initialSize=10
#min idle connecton size 空闲时最小连接
minIdle=5
#max active connection size 最大
maxActive=20
#max wait time (5000 mil seconds)
maxWait=5000

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JavaStudy12(27章-满汉楼)—B站hsp

1.程序框架图

2 代码演示

2.1 DAO层

2.2 domain

2.3 service

2.4utils

2.5 view

2.6 properties

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