基于 JAVASSM 框架沙县小吃点餐系统

基于 JAVASSM 框架（即 Java + Spring + Spring MVC + MyBatis）开发一个沙县小吃点餐系统。
在这里插入图片描述

步骤一：需求分析

明确系统需要实现的功能，比如：

用户注册和登录
浏览菜单
添加菜品到购物车
下单并支付
订单管理
后台管理（菜品管理、订单管理等）

步骤二：设计数据库

使用 MySQL 数据库存储系统数据。设计数据库表结构如下：

用户表（users）

id (INT, 主键, 自增)
username (VARCHAR)
password (VARCHAR)
email (VARCHAR)
phone (VARCHAR)

菜品表（dishes）

id (INT, 主键, 自增)
name (VARCHAR)
price (DECIMAL)
description (TEXT)
image_url (VARCHAR)

购物车表（cart_items）

id (INT, 主键, 自增)
user_id (INT, 外键)
dish_id (INT, 外键)
quantity (INT)

订单表（orders）

id (INT, 主键, 自增)
user_id (INT, 外键)
total_price (DECIMAL)
order_time (DATETIME)
status (VARCHAR)

订单详情表（order_details）

id (INT, 主键, 自增)
order_id (INT, 外键)
dish_id (INT, 外键)
quantity (INT)
price (DECIMAL)

步骤三：选择开发工具

使用 IntelliJ IDEA 或 Eclipse 作为开发环境。

步骤四：搭建项目结构

创建 Maven 项目。
添加必要的依赖项（Spring、Spring MVC、MyBatis、MySQL 驱动等）。

步骤五：配置文件

application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/sandwich_shop?useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

mybatis.mapper-locations=classpath:mapper/*.xml

spring-mvc.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="com.sandwichshop"/>
    <mvc:annotation-driven/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

mybatis-config.xml

<configuration>
    <mappers>
        <mapper resource="mapper/UserMapper.xml"/>
        <mapper resource="mapper/DishMapper.xml"/>
        <!-- 其他 Mapper 文件 -->
    </mappers>
</configuration>

步骤六：编写实体类

User.java

package com.sandwichshop.entity;

public class User {
    private int id;
    private String username;
    private String password;
    private String email;
    private String phone;

    // Getters and Setters
}

Dish.java

package com.sandwichshop.entity;

public class Dish {
    private int id;
    private String name;
    private double price;
    private String description;
    private String imageUrl;

    // Getters and Setters
}

步骤七：编写 DAO 层

UserMapper.java

package com.sandwichshop.mapper;

import com.sandwichshop.entity.User;
import org.apache.ibatis.annotations.*;

@Mapper
public interface UserMapper {
    @Select("SELECT * FROM users WHERE username = #{username} AND password = #{password}")
    User login(@Param("username") String username, @Param("password") String password);

    @Insert("INSERT INTO users(username, password, email, phone) VALUES(#{username}, #{password}, #{email}, #{phone})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    void register(User user);
}

DishMapper.java

package com.sandwichshop.mapper;

import com.sandwichshop.entity.Dish;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface DishMapper {
    @Select("SELECT * FROM dishes")
    List<Dish> getAllDishes();

    @Select("SELECT * FROM dishes WHERE id = #{id}")
    Dish getDishById(int id);

    @Insert("INSERT INTO dishes(name, price, description, image_url) VALUES(#{name}, #{price}, #{description}, #{imageUrl})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    void addDish(Dish dish);

    @Update("UPDATE dishes SET name=#{name}, price=#{price}, description=#{description}, image_url=#{imageUrl} WHERE id=#{id}")
    void updateDish(Dish dish);

    @Delete("DELETE FROM dishes WHERE id=#{id}")
    void deleteDish(int id);
}

步骤八：编写 Service 层

UserService.java

package com.sandwichshop.service;

import com.sandwichshop.entity.User;
import com.sandwichshop.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    public User login(String username, String password) {
        return userMapper.login(username, password);
    }

    public void register(User user) {
        userMapper.register(user);
    }
}

DishService.java

package com.sandwichshop.service;

import com.sandwichshop.entity.Dish;
import com.sandwichshop.mapper.DishMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class DishService {
    @Autowired
    private DishMapper dishMapper;

    public List<Dish> getAllDishes() {
        return dishMapper.getAllDishes();
    }

    public Dish getDishById(int id) {
        return dishMapper.getDishById(id);
    }

    public void addDish(Dish dish) {
        dishMapper.addDish(dish);
    }

    public void updateDish(Dish dish) {
        dishMapper.updateDish(dish);
    }

    public void deleteDish(int id) {
        dishMapper.deleteDish(id);
    }
}

步骤九：编写 Controller 层

UserController.java

package com.sandwichshop.controller;

import com.sandwichshop.entity.User;
import com.sandwichshop.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/login")
    public String showLoginForm() {
        return "login";
    }

    @PostMapping("/login")
    public String handleLogin(@RequestParam("username") String username, @RequestParam("password") String password, Model model) {
        User user = userService.login(username, password);
        if (user != null) {
            model.addAttribute("user", user);
            return "home";
        } else {
            model.addAttribute("error", "Invalid username or password");
            return "login";
        }
    }

    @GetMapping("/register")
    public String showRegisterForm() {
        return "register";
    }

    @PostMapping("/register")
    public String handleRegister(User user) {
        userService.register(user);
        return "redirect:/login";
    }
}

DishController.java

package com.sandwichshop.controller;

import com.sandwichshop.entity.Dish;
import com.sandwichshop.service.DishService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.util.List;

@Controller
public class DishController {
    @Autowired
    private DishService dishService;

    @GetMapping("/menu")
    public String showMenu(Model model) {
        List<Dish> dishes = dishService.getAllDishes();
        model.addAttribute("dishes", dishes);
        return "menu";
    }

    @GetMapping("/dish/{id}")
    public String showDishDetails(@RequestParam("id") int id, Model model) {
        Dish dish = dishService.getDishById(id);
        model.addAttribute("dish", dish);
        return "dishDetails";
    }

    @GetMapping("/addDish")
    public String showAddDishForm() {
        return "addDish";
    }

    @PostMapping("/addDish")
    public String handleAddDish(Dish dish) {
        dishService.addDish(dish);
        return "redirect:/menu";
    }

    @GetMapping("/editDish/{id}")
    public String showEditDishForm(@RequestParam("id") int id, Model model) {
        Dish dish = dishService.getDishById(id);
        model.addAttribute("dish", dish);
        return "editDish";
    }

    @PostMapping("/editDish")
    public String handleEditDish(Dish dish) {
        dishService.updateDish(dish);
        return "redirect:/menu";
    }

    @GetMapping("/deleteDish/{id}")
    public String handleDeleteDish(@RequestParam("id") int id) {
        dishService.deleteDish(id);
        return "redirect:/menu";
    }
}

步骤十：前端页面

使用 JSP 或 Thymeleaf 创建前端页面。以下是简单的 JSP 示例：

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Login</title>
</head>
<body>
<h2>Login</h2>
<form action="${pageContext.request.contextPath}/login" method="post">
    Username: <input type="text" name="username"><br>
    Password: <input type="password" name="password"><br>
    <input type="submit" value="Login">
</form>
<c:if test="${not empty error}">
    <p style="color: red">${error}</p>
</c:if>
</body>
</html>

menu.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
    <title>Menu</title>
</head>
<body>
<h2>Menu</h2>
<table>
    <tr>
        <th>Name</th>
        <th>Price</th>
        <th>Description</th>
        <th>Image</th>
    </tr>
    <c:forEach items="${dishes}" var="dish">
        <tr>
            <td>${dish.name}</td>
            <td>${dish.price}</td>
            <td>${dish.description}</td>
            <td><img src="${dish.imageUrl}" alt="${dish.name}" width="100"></td>
        </tr>
    </c:forEach>
</table>
<a href="${pageContext.request.contextPath}/addDish">Add New Dish</a>
</body>
</html>