本课程以当前热门的外卖点餐为业务基础,业务真实、实用、广泛。基于流行的Spring Boot、mybatis
plus等技术框架进行开发,带领学员体验真实项目开发流程、需求分析过程和代码实现过程。学完本课程能够收获:锻炼需求分析能力、编码能力、bug调试能力,增长开发经验。
需求分析:
套餐就是菜品的集合.
后台系统中可以管理套餐信息,通过新增套餐功能来添加一个新的套餐,在添加套餐时需要选择当前套餐所属的套餐
分类和包含的菜品!并且需要上传套餐对应的图片,在移动端会按照套餐分类来展示对应的套餐。
数据模型:
新增套餐,其实就是将新增页面录入的套餐信息插入到setmeal表,还需要向setmeal_dish表插入套餐和菜品关联数据。
所以在新增套餐时,涉及到两个表:
- setmeal 套餐表
- setmeal_dish 套餐菜品关系表
在开发业务功能前,先将需要用到的类和接口基本结构创建好:
实体类SetmealDish
DTO SetmealDto
package com.reggie.DTO;
import com.reggie.entity.Setmeal;
import com.reggie.entity.SetmealDish;
im坎普iopt 吃点饭认得日日日f't'ge'w's'xport lombok.Data;
import java.util.List;
@Data
public class SetmealDto extends Setmeal {
private List<SetmealDish> setmealDishes;
private String categoryName;
}
Mapper接口SetmealDishMapper
package com.reggie.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.reggie.entity.SetmealDish;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface SetmealDishMapper extends BaseMapper<SetmealDish> {
}
业务层接▣SetmealDishService
package com.reggie.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.reggie.entity.SetmealDish;
public interface SetmealDishService extends IService<SetmealDish> {
}
业务层实现类SetmealDishServicelmpl
package com.reggie.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.reggie.entity.SetmealDish;
import com.reggie.mapper.SetmealDishMapper;
import com.reggie.mapper.SetmealMapper;
import com.reggie.service.SetmealDishService;
import org.springframework.stereotype.Service;
@Service
public class SetmealDishServicelmpl extends ServiceImpl<SetmealDishMapper, SetmealDish> implements SetmealDishService {
}
控制层SetmealController
package com.reggie.controller;
import com.reggie.service.SetmealDishService;
import com.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@Slf4j
@RestController
@RequestMapping("/setmeal")
public class SetmealController {
@Autowired
private SetmealDishService setmealDishService;
@Autowired
private SetmealService setmealService;
}
在开发代码之前,需要梳理一下新增套餐时前端页面和服务端的交互过程:
1、页面(backend/page/combo/add.html)发送ajax请求,请求服务端获取套餐分类数据并展示到下拉框中
2、页面发送ajx请求,请求服务端获取菜品分类数据并展示到添加菜品窗口中
3、页面发送ajx请求,请求服务端,根据菜品分类查询对应的菜品数据并展示到添加菜品窗口中
4、页面发送请求进行图片上传,请求服务端将图片保存到服务器
5、页面发送请求进行图片下载,将上传的图片进行回显
6、点击保存按钮,发送ajax请求,将套餐相关数据以)json形式提交到服务端
开发新增套餐功能,其实就是在服务端编写代码去处理前端页面发送的这6次请求即可。
在DishController中创建List方法,用于查询菜品
@GetMapping("/list")
public R<List<Dish>> List(Dish dish){
LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(dish.getCategoryId()!=null,Dish::getCategoryId,dish.getCategoryId());
queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);
List<Dish> list = dishService.list(queryWrapper);
return R.success(list);
}
在SetmealService中创建方法saveWithDish,并在SetmealServiceImpl中实现,仿照之前代码,使用stream流,从中setmealDto读出ID,最后在SetmealController中调用方法完成保存
@Transactional
@Override
public void saveWithDish(SetmealDto setmealDto) {
this.save(setmealDto);
List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
setmealDishes.stream().map((item)->{
item.setDishId(setmealDto.getId());
return item;
}).collect(Collectors.toList());
setmealDishService.saveBatch(setmealDishes);
}
@PostMapping
public R<String> save(@RequestBody SetmealDto setmealDto){
setmealService.saveWithDish(setmealDto);
return R.success("套餐保存成功!") ;
}
跟菜品分页查询几乎一模一样,此处跳过
@GetMapping("/page")
public R<Page> page(int page, int pageSize, String name){
log.info("接收到查询请求,page={},pageSize={},name={}",page,pageSize,name);
//构造分页构造器
Page<Setmeal> pageinfo=new Page<>(page,pageSize);
Page<SetmealDto> setmealDtoPage = new Page<>(page,pageSize);
//构造条件构造器
LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
//添加过滤条件
queryWrapper.like(StringUtils.isNotEmpty(name),Setmeal::getName,name);
//添加排序条件
queryWrapper.orderByDesc(Setmeal::getUpdateTime);
//执行查询
setmealService.page(pageinfo,queryWrapper);
BeanUtils.copyProperties(pageinfo,setmealDtoPage,"records");
List<Setmeal> records = pageinfo.getRecords();
List<SetmealDto> list = null;
list = records.stream().map((item)->{
SetmealDto setmealDto = new SetmealDto();
BeanUtils.copyProperties(item,setmealDto);
Long categoryId = item.getCategoryId();
Category category = categoryService.getById(categoryId);
if(category!=null){
String categoryName = category.getName();
setmealDto.setCategoryName(categoryName);
}
return setmealDto;
}).collect(Collectors.toList());
setmealDtoPage.setRecords(list);
return R.success(setmealDtoPage);
}
需求分析
在套餐管理列表页面点击删除按钮,可以删除对应的套餐信息。也可以通过复选框选择多个套餐,点击批量删
除按钮一次删除多个套餐。注意,对于状态为售卖中的套餐不能删除,需要先停售,然后才能删除。
在SetmealController中创建方法,并添加@PostMapping注解,传入参数为@RequestBody SetmealDto setmealDto
@DeleteMapping
public R<String> delete(@RequestParam List<Long> ids){
return null;
}
在SetmealService中创建removeWithDish方法,并在SetmealServiceImpl中实现方法
@Override
public void removeWithDish(List<Long> ids) {
LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.in(Setmeal::getId,ids).eq(Setmeal::getStatus,1);
int count = this.count(queryWrapper);
if(count>0){
throw new CustomException("套餐正在售卖中,无法删除!");
}
this.removeByIds(ids);
LambdaQueryWrapper<SetmealDish> queryWrapper1 = new LambdaQueryWrapper<>();
queryWrapper1.in(SetmealDish::getSetmealId,ids);
setmealDishService.remove(queryWrapper1);
}
创建utils包,拷入两个工具类
package com.reggie.utils;
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.dysmsapi.model.v20170525.SendSmsRequest;
import com.aliyuncs.dysmsapi.model.v20170525.SendSmsResponse;
import com.aliyuncs.exceptions.ClientException;
import com.aliyuncs.profile.DefaultProfile;
/**
* 短信发送工具类
*/
public class SMSUtils {
/**
* 发送短信
* @param signName 签名
* @param templateCode 模板
* @param phoneNumbers 手机号
* @param param 参数
*/
public static void sendMessage(String signName, String templateCode,String phoneNumbers,String param){
DefaultProfile profile = DefaultProfile.getProfile("cn-hangzhou", "", "");
IAcsClient client = new DefaultAcsClient(profile);
SendSmsRequest request = new SendSmsRequest();
request.setSysRegionId("cn-hangzhou");
request.setPhoneNumbers(phoneNumbers);
request.setSignName(signName);
request.setTemplateCode(templateCode);
request.setTemplateParam("{\"code\":\""+param+"\"}");
try {
SendSmsResponse response = client.getAcsResponse(request);
System.out.println("短信发送成功");
}catch (ClientException e) {
e.printStackTrace();
}
}
}
package com.reggie.utils;
import java.util.Random;
/**
* 随机生成验证码工具类
*/
public class ValidateCodeUtils {
/**
* 随机生成验证码
* @param length 长度为4位或者6位
* @return
*/
public static Integer generateValidateCode(int length){
Integer code =null;
if(length == 4){
code = new Random().nextInt(9999);//生成随机数,最大为9999
if(code < 1000){
code = code + 1000;//保证随机数为4位数字
}
}else if(length == 6){
code = new Random().nextInt(999999);//生成随机数,最大为999999
if(code < 100000){
code = code + 100000;//保证随机数为6位数字
}
}else{
throw new RuntimeException("只能生成4位或6位数字验证码");
}
return code;
}
/**
* 随机生成指定长度字符串验证码
* @param length 长度
* @return
*/
public static String generateValidateCode4String(int length){
Random rdm = new Random();
String hash1 = Integer.toHexString(rdm.nextInt());
String capstr = hash1.substring(0, length);
return capstr;
}
}
创建实体类User
package com.reggie.entity;
import lombok.Data;
import java.time.LocalDateTime;
import java.util.Date;
import java.util.List;
import java.io.Serializable;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
/**
* 用户信息
*/
@Data
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private Long id;
//姓名
private String name;
//手机号
private String phone;
//性别 0 女 1 男
private String sex;
//身份证号
private String idNumber;
//头像
private String avatar;
//状态 0:禁用,1:正常
private Integer status;
}
依次创建Mapper/Service/ServiceImpl/Controller
package com.reggie.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.reggie.entity.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
package com.reggie.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.reggie.entity.User;
public interface UserService extends IService<User> {
}
package com.reggie.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.reggie.entity.User;
import com.reggie.mapper.UserMapper;
import com.reggie.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
}
package com.reggie.controller;
import com.reggie.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@Slf4j
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
}
在UserController中创建sendMsg方法用于发送验证码
@PostMapping("/sendMsg")
public R<String> sendMsg(@RequestBody User user, HttpSession session){
String phone = user.getPhone();
if(StringUtils.isNotEmpty(phone)){
String code = ValidateCodeUtils.generateValidateCode(4).toString();
//调用api发送短信
log.info("验证码为:{}",code);
//需要申请签名,先跳过
session.setAttribute(phone,code);
return R.success("验证码发送成功!");
}
return R.error("验证码发送失败!");
}
在UserController中创建login方法判断验证码是否正确,并在验证码正确后进行查询,若数据库中不存在此用户,则自动创建
@PostMapping("/login")
public R<User> login(@RequestBody Map map, HttpSession session){
String phone = map.get("phone").toString();
String code = map.get("code").toString();
Object codeInSession = session.getAttribute(phone);
if(codeInSession!= null&&codeInSession.equals(code)){
LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.eq(User::getPhone,phone);
User user = userService.getOne(queryWrapper);
if(user==null){
user = new User();
user.setPhone(phone);
user.setStatus(1);
userService.save(user);
log.info("用户{}注册成功!",user.toString());
}
session.setAttribute("user",phone);
return R.success(user);
}
return R.error("");
}