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# 电商基础秒杀项目
项目简介基于SpringBoot数据库使用MySQL
开发工具IntelliJ IDEA 2021.3.2 (Ultimate Edition)
数据库版本MySQL 5.7
项目数据库文件:[点击打开](./Others/sql/flashsale.sql)
### 默认用户
> 用户名密码均为 `admin`
### 层次结构以User为例自上向下
| | 目录 | Java对象类型 | 说明 | 举例 |
| ----------------- | --------------------- | --------------------------------------- | ---------------------------------------- | ------------------------------- |
| **Controller层** | | | | |
| Controller | controller | 类 class | | controller.UserController |
| View Object (VO) | controller/viewobject | 类 class | 将用户Model转化为可供UI使用的View Object | controller.UserController |
| | | | | |
| **Service层** | 转换成业务模型 | | | |
| Service | service | 接口 interface | | service.UserService |
| ServiceImpl | service/impl | Service接口实现类 | 将DataObject组装成Model | service.impl.UserServiceImpl |
| Model | service/model | 类 class | 用户模型Model | service.model.UserModel |
| | | | | |
| **Dao层** | 对数据库的映射 | | | |
| Mapper | dao | 接口 interface | | dao.UserDOMapper |
| Mapping | resources/mapping | Mapper接口实现类 | xml格式SQL语句 | mapping/UserDOMapper.xml |
| Data Object (DO) | dataobject | 类 class | | dataobject.UserDO |
| | | | | |
| **其他** | | | | |
| response | response | | 用于处理HTTP请求返回 | response.CommonReturnType |
| ValidationResult | validator | 类 class | Hibernate Validator 参数验证 | validator\ValidationResult.java |
| ValidatorImpl | validator | ValidationResult类实现类 | Hibernate Validator 参数验证 | validator\ValidatorImpl.java |
| | | | | |
| **异常处理** | 用于返回错误信息 | | | |
| CommonError | error | 接口 interface | | error.CommonError |
| EmBusinessError | error | 枚举 enum & CommonError接口实现类 | | error.EmBusinessError |
| BusinessException | error | CommonError接口实现类 & 继承自Exception | | error.BusinessException |
**Tips:** Model与Data Object并非完全一一对应例如UserModel是由ServiceImpl将UserDO和UserPasswordDO组装而成的。
代码构建顺序:
1. 创建Model模型service/model
2. 创建数据库中数据表
3. 使用mybatis-generator生成数据库映射文件dao ; dataobject ; resources/mapping
4. 创建Service接口service
5. 创建Service接口实现Implservice/implclass打上 `Service` 标注;方法上打上 `@Transactional` 标签保证是在同一事务中)
6. 思考ServiceImpl中需要哪几步并逐步实现
> - 如果需要修改自动生成的数据库语句,先改 resources/mapping 下的xml映射SQL语句然后修改 dao 下的DOMapper接口
>
> - 可以用 `org.springframework.beans` 包中的 `BeanUtils.copyProperties` 进行DO转Model或Model转DO要字段和类型完全一致的字段才能拷贝其他不对应字段的需要手动设置
7. Service返回Controller前完成将DO转换为Model同时进行业务处理最后返回Model
8. 创建Controller继承BaseController在class上添加注解
```java
@Controller("/item")
@RequestMapping("/item")
@CrossOrigin(allowedHeaders = "*", allowCredentials = "true")
```
9. 创建Controller方法添加以下注释
```java
// POST
@RequestMapping(value = "/create", method = {RequestMethod.POST}, consumes = {CONTENT_TYPE_FORMED})
@ResponseBody
// GET
@RequestMapping(value = "/get", method = {RequestMethod.GET})
@ResponseBody
```
10.