满汉楼01-3
4.功能实现02
4.2菜单界面显示
4.2.1功能说明
显示主菜单、二级菜单和退出系统功能
4.2.2代码实现
先搭建界面显示的大体框架,具体的功能后面再实现
创建MHLView类:
package com.li.mhl.view;
import com.li.mhl.utils.Utility;
/**
* @author 李
* @version 1.0
* 这是主界面
*/
public class MHLView {
//控制是否退出菜单
private boolean loop = true;
private String key = "";//接收用户的输入
public static void main(String[] args) {
new MHLView().mainMenu();
}
//显示主菜单
public void mainMenu() {
while (loop) {
System.out.println("==================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);//接收用户选择
switch (key) {
case "1":
System.out.print("请输入员工号: ");
String id=Utility.readString(50);
System.out.print("请输入密 码: ");
String pws = Utility.readString(50);
//到数据库去判断,这里先简单判断一下
if ("123".equals(pws)) {
System.out.println("==================登录成功=================\n");
//显示二级菜单,这里也和一级菜单一样是循环操作,也放在循环语句中
while (loop){
System.out.println("==================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 参看账单");
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);//接收用户的选择
switch(key){
case "1":
System.out.println("显示餐桌状态");
break;
case "2":
System.out.println("预定餐桌");
break;
case "3":
System.out.println("显示所有菜品");
break;
case "4":
System.out.println("点餐服务");
break;
case "5":
System.out.println("参看账单");
break;
case "6":
System.out.println("结账");
break;
case "9":
//因为loop同时控制两层循环,因此当loop设为false时,
// 里层循环退出之后,外层循环也会随之退出
loop=false;
break;
default:
System.out.println("输入有误,请重新输入");
break;
}
}
}else {
System.out.println("==================登录失败==================");
}
break;
case "2":
loop = false;//退出一级菜单的循环
break;
default:
System.out.println("输入有误,重新输入..");
}
}
System.out.println("你退出了满汉楼系统~");
}
}
4.3用户登录功能
4.3.1功能说明
4.3.2思路分析
在数据库创建一张employee表,创建对应的Javabean,创建对应的EmployeeDAO,service层...
(大体上就是根据框架图从下至上编写代码)
4.3.3代码实现
4.3.3.1创建数据库mhl和表employee
-- 创建满汉楼的数据库
CREATE DATABASE mhl;
-- 创建表employee(主键id,empId,name,pwd,job等)
CREATE TABLE employee(
id INT PRIMARY KEY AUTO_INCREMENT,#自增
empId VARCHAR(50) UNIQUE 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
)CHARSET=utf8
-- 插入测试数据
INSERT INTO employee VALUES(NULL,'6668612',MD5('123456'),'张三丰','经理');
INSERT INTO employee VALUES(NULL,'6668622',MD5('123456'),'小龙女','服务员');
INSERT INTO employee VALUES(NULL,'6668633',MD5('123456'),'张无忌','收银员');
INSERT INTO employee VALUES(NULL,'666666',MD5('123456'),'olien','经理');
SELECT * FROM employee;
4.3.3.2创建Employee类
创建和表employee对应的Javabean-Employee
package com.li.mhl.domain;
/**
* @author 李
* @version 1.0
* 这是一个Javabean ,和表employee对应
*/
public class Employee {
/**
* +-------+-------------+------+-----+---------+----------------+
* | Field | Type | Null | Key | Default | Extra |
* +-------+-------------+------+-----+---------+----------------+
* | id | int(11) | NO | PRI | NULL | auto_increment |
* | empId | varchar(50) | NO | | | |
* | pwd | char(32) | NO | | | |
* | name | varchar(50) | NO | | | |
* | job | varchar(50) | NO | | | |
* +-------+-------------+------+-----+---------+----------------+
*/
private Integer id;
private String empId;
private String pwd;
private String name;
private String job;
public Employee() {//无参构造器,底层的Apache-DBUtils反射需要
}
public Employee(Integer id, String empId, String pwd, String name, String job) {
this.id = id;
this.empId = empId;
this.pwd = pwd;
this.name = name;
this.job = job;
}
public Integer getId() {
return id;
}
public void setId(Integer 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;
}
@Override
public String toString() {
return "Employee{" +
"id=" + id +
", empId='" + empId + '\'' +
", pwd='" + pwd + '\'' +
", name='" + name + '\'' +
", job='" + job + '\'' +
'}';
}
}
4.3.3.3创建EmployeeDAO类
package com.li.mhl.dao;
import com.li.mhl.domain.Employee;
/**
* @author 李
* @version 1.0
*/
public class EmployeeDAO extends BasicDAO<Employee>{
//这里还可以执行特有的操作
}
4.3.3.4创建EmployeeService类
编写一个getEmployeeByIdAndPwd方法,来验证账号密码,并返回相应值
package com.li.mhl.service;
import com.li.mhl.dao.EmployeeDAO;
import com.li.mhl.domain.Employee;
/**
* @author 李
* @version 1.0
* 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();
//登录校验方法
//根据empId和pwd返回一个Employee对象,如果查询不到,就返回null
public Employee getEmployeeByIdAndPwd(String empId, String pwd) {
//注意密码使用md5加密后再查询比较
Employee employee =
employeeDAO.querySingle("select * from employee where empId=? and pwd=md5(?) ", Employee.class, empId, pwd);
return employee;
}
}
4.3.3.5修改MHLView类
在MHLView类中的里层循环中,调用方法getEmployeeByIdAndPwd,如果返回的employee对象非空,则说明存在该用户,登录成功
修改处1:增加EmployeeService属性
//定义EmployeeService属性
private EmployeeService employeeService=new EmployeeService();
修改处2:
4.4显示餐桌状态
4.4.1功能说明
当用户登录成功之后,选择显示餐桌状态,可以看到所有的餐桌编号以及对应的餐桌状态
4.4.2思路分析
创建表diningTable,创建对应的Javabean,创建对应的DAO,service层...
4.4.3代码实现
4.4.3.1创建diningTable表
-- 创建表diningTable(主键id,empId,name,pwd,job等)
CREATE TABLE diningTable(
id INT PRIMARY KEY AUTO_INCREMENT,#自增,表示餐桌编号
state VARCHAR(20)NOT NULL DEFAULT '',#餐桌状态
orderName VARCHAR(50) NOT NULL DEFAULT '',#预定人的名字
orderTel VARCHAR(20) NOT NULL DEFAULT ''#预定人的电话
)CHARSET=utf8
-- 插入测试数据
INSERT INTO diningTable VALUES(NULL,'空','','');
INSERT INTO diningTable VALUES(NULL,'空','','');
INSERT INTO diningTable VALUES(NULL,'空','','');
SELECT * FROM diningTable;
4.4.3.2创建DiningTable类
package com.li.mhl.domain;
/**
* @author 李
* @version 1.0
* 这是一个Javabean ,和表 diningTable对应
*/
public class DiningTable {
/**
* Field Type Null Key Default Extra
* --------- ----------- ------ ------ ------- ----------------
* id int(11) NO PRI (NULL) auto_increment
* state varchar(20) NO
* orderName varchar(50) NO
* orderTel varchar(20) NO
*/
private Integer id;
private String state;
private String orderName;
private String orderTel;
public DiningTable() {//无参构造器,反射需要
}
public DiningTable(Integer id, String state, String orderName, String orderTel) {
this.id = id;
this.state = state;
this.orderName = orderName;
this.orderTel = orderTel;
}
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;
}
@Override
public String toString() {
return id + "\t\t\t" + state;
}
}
4.4.3.3创建DiningTableDAO类
package com.li.mhl.dao;
import com.li.mhl.domain.DiningTable;
/**
* @author 李
* @version 1.0
*/
public class DiningTableDAO extends BasicDAO<DiningTable>{
//如果有特别的操作,可以写在DiningTableDAO中
}
4.4.3.4创建DiningTableService类
package com.li.mhl.service;
import com.li.mhl.dao.DiningTableDAO;
import com.li.mhl.domain.DiningTable;
import java.util.List;
/**
* @author 李
* @version 1.0
* 该类完成对 diningTable表的各种操作(通过调用DiningTableDAO对象完成)
*/
public class DiningTableService {//业务层
//定义一个DiningTableDAO对象
private DiningTableDAO diningTableDAO = new DiningTableDAO();
//返回所有餐桌的信息
public List<DiningTable> list(){
List<DiningTable> diningTables =
diningTableDAO.queryMulti("select id,state from diningTable", DiningTable.class);
return diningTables;
}
}
4.4.3.5修改MHLView类
修改处1:增加DiningTableService属性
//定义DiningTableService属性
private DiningTableService diningTableService=new DiningTableService();
修改处2:增加listDiningTable()方法,显示餐桌信息
//显示餐桌状态
public void listDiningTable(){
List<DiningTable> list = diningTableService.list();
System.out.println("\n餐桌编号\t\t餐桌状态");
for (DiningTable diningTable:list) {
System.out.println(diningTable);
}
System.out.println("============显示完毕============");
}
修改处3:在内层循环中调用方法listDiningTable
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