一、项目演示

项目演示地址： 视频地址

二、项目介绍

项目描述：这是一个基于SpringBoot+微信小程序框架开发的在线订餐小程序系统。首先，这是一个前后端分离的项目，代码简洁规范，注释说明详细，易于理解和学习。其次，这项目功能丰富，具有一个在线订餐小程序系统该有的所有功能。

项目功能：此项目分为两个角色：普通用户和管理员。普通用户有登录注册、浏览商品信息、添加购物车、结算订单、查看个人信息、查看个人订单详情、管理个人地址信息、发布评价信息等等功能。管理员有管理所有商品信息、管理所有订单信息、管理所有用户信息、管理所有评价信息等等功能。

应用技术：SpringBoot + 微信小程序 + MySQL + MyBatis + Redis + ElementUI + Lua + Vue + Vant Weapp

运行环境：IntelliJ IDEA2019.3.5 + 微信开发者工具（项目压缩包中自带）+ MySQL5.7（项目压缩包中自带) + Redis5.0.5（项目压缩包中自带） + JDK1.8 + Maven3.6.3（项目压缩包中自带）+ Node14.16.1（项目压缩包中自带）

三、运行截图

四、主要代码

1.提交订单代码

    @Override    public ResponseDTO submitOrder(OrderDTO orderDTO) {        UserDTO userDTO = new UserDTO();        userDTO.setToken(orderDTO.getToken());        ResponseDTO loginUserResponse = userService.getLoginUser(userDTO);        if(!CodeMsg.SUCCESS.getCode().equals(loginUserResponse.getCode())) {            return ResponseDTO.errorByMsg(CodeMsg.USER_SESSION_EXPIRED);        }        // 获取登录用户信息        userDTO = loginUserResponse.getData();        AddressExample addressExample = new AddressExample();        addressExample.createCriteria().andUserIdEqualTo(userDTO.getId());        if(addressMapper.selectByExample(addressExample).size() == 0) {            return ResponseDTO.errorByMsg(CodeMsg.ADDRESS_NOT_EXIST);        }        String[] cartIdList = orderDTO.getCartIdList().split(",");        CartExample cartExample = new CartExample();        cartExample.createCriteria().andIdIn(Arrays.stream(cartIdList).collect(Collectors.toList()));        List cartList = cartMapper.selectByExample(cartExample);        List productIdList = cartList.stream().map(Cart::getProductId).collect(Collectors.toList());        ProductExample productExample = new ProductExample();        productExample.createCriteria().andIdIn(productIdList);        List productList = productMapper.selectByExample(productExample);        List productNameList = productList.stream().map(Product::getName).collect(Collectors.toList());        List productPriceList = productList.stream().map(Product::getPrice).map(String::valueOf).collect(Collectors.toList());        List productPhotoList = productList.stream().map(Product::getPhoto).map(String::valueOf).collect(Collectors.toList());        List cartQuantityList = cartList.stream().map(Cart::getQuantity).map(String::valueOf).collect(Collectors.toList());        String orderId = UuidUtil.getShortUuid();        String orderDate = CommonUtil.getFormatterDate(new Date(), "yyyy-MM-dd HH:mm:ss");        // 执行lua脚本        String result = stringRedisTemplate.execute(                SECKILL_SCRIPT,                Collections.singletonList(RedisConstant.STOCK_REDIS_KEY_TEMPLATE),                StringUtils.join(productIdList, ","),                StringUtils.join(productNameList, ","),                StringUtils.join(cartQuantityList, ","),                orderId,                userDTO.getId(),                orderDate,                StringUtils.join(productPriceList, ","),                StringUtils.join(productPhotoList, ","),                StringUtils.join(Arrays.asList(cartIdList), ",")        );        if(!"成功".equals(result)) {            CodeMsg codeMsg = CodeMsg.PRODUCT_STOCK_OVER;            codeMsg.setMsg(result);            return ResponseDTO.errorByMsg(codeMsg);        }        orderDTO.setId(orderId);        return ResponseDTO.success(orderDTO);    }

2.购物车保存操作(添加、减少)代码

     @Override    public ResponseDTO saveCart(CartDTO cartDTO) {        UserDTO userDTO = new UserDTO();        userDTO.setToken(cartDTO.getToken());        ResponseDTO loginUserResponse = userService.getLoginUser(userDTO);        if(!CodeMsg.SUCCESS.getCode().equals(loginUserResponse.getCode())) {            return ResponseDTO.errorByMsg(CodeMsg.USER_SESSION_EXPIRED);        }        // 获取登录用户信息        userDTO = loginUserResponse.getData();        cartDTO.setUserId(userDTO.getId());        Product product = productMapper.selectByPrimaryKey(cartDTO.getProductId());        if (product == null) {            return ResponseDTO.errorByMsg(CodeMsg.PRODUCT_NOT_EXIST);        }        Cart cart = CopyUtil.copy(cartDTO, Cart.class);        // 判断购物车是否已经有此商品        CartExample cartExample = new CartExample();        cartExample.createCriteria().andProductIdEqualTo(cartDTO.getProductId()).andUserIdEqualTo(cartDTO.getUserId());        List cartList = cartMapper.selectByExample(cartExample);        if(cartList.size() > 0) {            // 购物车中已经有此商品            if(CartOperateEnum.ADD.getCode().equals(cartDTO.getOperateType())) {                // 添加操作                if(cart.getQuantity() + cartList.get(0).getQuantity() > product.getStock()) {                    return ResponseDTO.errorByMsg(CodeMsg.PRODUCT_STOCK_OVER);                }                cartList.get(0).setQuantity(cart.getQuantity() + cartList.get(0).getQuantity());            } else if (CartOperateEnum.SUB.getCode().equals(cartDTO.getOperateType())) {                // 减少操作                if(cartList.get(0).getQuantity() <= cart.getQuantity()) {                    // 删除                    CartDTO copy = CopyUtil.copy(cartList.get(0), CartDTO.class);                    copy.setToken(cartDTO.getToken());                    removeCart(copy);                    return ResponseDTO.successByMsg(true, "购物车操作成功！");                } else {                    cartList.get(0).setQuantity(cartList.get(0).getQuantity() - cart.getQuantity());                }            }            // 更新数据            if(cartMapper.updateByPrimaryKeySelective(cartList.get(0)) == 0) {                return ResponseDTO.errorByMsg(CodeMsg.CART_SAVE_ERROR);            }        } else {            // 购物车中没有此商品            if(product.getStock() == 0) {                return ResponseDTO.errorByMsg(CodeMsg.PRODUCT_STOCK_OVER);            }            cart.setId(UuidUtil.getShortUuid());            // 添加数据            if(cartMapper.insertSelective(cart) == 0) {                return ResponseDTO.errorByMsg(CodeMsg.CART_SAVE_ERROR);            }        }        return ResponseDTO.successByMsg(true, "购物车操作成功！");    }

3.小程序登录操作代码

    @Override    public ResponseDTO appLogin(UserDTO userDTO) {        // 进行是否为空判断        if(CommonUtil.isEmpty(userDTO.getUsername())){            return ResponseDTO.errorByMsg(CodeMsg.USERNAME_EMPTY);        }        if(CommonUtil.isEmpty(userDTO.getPassword())){            return ResponseDTO.errorByMsg(CodeMsg.PASSWORD_EMPTY);        }        // 对比昵称和密码是否正确        UserExample userExample = new UserExample();        userExample.createCriteria().andUsernameEqualTo(userDTO.getUsername()).andPasswordEqualTo(userDTO.getPassword());        List userList = userMapper.selectByExample(userExample);        if(userList == null || userList.size() != 1){            return ResponseDTO.errorByMsg(CodeMsg.USERNAME_PASSWORD_ERROR);        }        // 生成登录token并存入Redis中        User selectedUser = userList.get(0);        UserDTO selectedUserDTO = CopyUtil.copy(selectedUser, UserDTO.class);        String token = UuidUtil.getShortUuid();        selectedUserDTO.setToken(token);        //把token存入redis中 有效期1小时        stringRedisTemplate.opsForValue().set("USER_" + token, JSON.toJSONString(selectedUser), 3600, TimeUnit.SECONDS);        return ResponseDTO.successByMsg(selectedUserDTO, "登录成功！");    }

来源地址：https://blog.csdn.net/dgfdhgghd/article/details/131496005