2022-03-01 15:21:38 +08:00
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# 电商基础秒杀项目
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2022-03-01 15:40:59 +08:00
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项目简介：基于SpringBoot，数据库使用MySQL
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开发工具：IntelliJ IDEA 2021.3.2 (Ultimate Edition)
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数据库版本：MySQL 5.7
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2022-03-01 17:17:29 +08:00
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项目数据库文件：[点击打开](./Others/sql/flashsale.sql)
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### 默认用户
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> 用户名密码均为 `admin`
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### 层次结构（以User为例，自上向下）
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2022-03-02 22:24:19 +08:00
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| | 目录 | Java对象类型 | 说明 | 举例 |
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| ----------------- | --------------------- | --------------------------------------- | ---------------------------------------- | ------------------------------- |
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| **Controller层** | | | | |
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| Controller | controller | 类 class | | controller.UserController |
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2022-03-03 22:59:32 +08:00
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| View Object (VO) | controller/viewobject | 类 class | 将用户Model转化为可供UI使用的View Object | controller.UserController |
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2022-03-02 22:24:19 +08:00
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| | | | | |
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| **Service层** | 转换成业务模型 | | | |
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| Service | service | 接口 interface | | service.UserService |
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| ServiceImpl | service/impl | Service接口实现类 | 将DataObject组装成Model | service.impl.UserServiceImpl |
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| Model | service/model | 类 class | 用户模型Model | service.model.UserModel |
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| **Dao层** | 对数据库的映射 | | | |
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| Mapper | dao | 接口 interface | | dao.UserDOMapper |
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| Mapping | resources/mapping | Mapper接口实现类 | xml格式；SQL语句 | mapping/UserDOMapper.xml |
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2022-03-03 22:59:32 +08:00
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| Data Object (DO) | dataobject | 类 class | | dataobject.UserDO |
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2022-03-02 22:24:19 +08:00
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| | | | | |
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| **其他** | | | | |
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| response | response | | 用于处理HTTP请求返回 | response.CommonReturnType |
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| ValidationResult | validator | 类 class | Hibernate Validator 参数验证 | validator\ValidationResult.java |
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| ValidatorImpl | validator | ValidationResult类实现类 | Hibernate Validator 参数验证 | validator\ValidatorImpl.java |
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| **异常处理** | 用于返回错误信息 | | | |
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| CommonError | error | 接口 interface | | error.CommonError |
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| EmBusinessError | error | 枚举 enum & CommonError接口实现类 | | error.EmBusinessError |
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| BusinessException | error | CommonError接口实现类 & 继承自Exception | | error.BusinessException |
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2022-03-01 17:17:59 +08:00
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2022-03-01 17:57:36 +08:00
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**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。
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2022-03-03 22:59:32 +08:00
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代码构建顺序：
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1. 创建Model模型（service/model）
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2. 创建数据库中数据表
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3. 使用mybatis-generator生成数据库映射文件（dao ; dataobject ; resources/mapping）
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4. 创建Service接口（service）
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5. 创建Service接口实现Impl（service/impl）（class打上 `Service` 标注；方法上打上 `@Transactional` 标签保证是在同一事务中）
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6. 思考ServiceImpl中需要哪几步，并逐步实现
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> - 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
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>
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> - 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）
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2022-03-03 23:37:17 +08:00
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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
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2022-03-03 23:37:17 +08:00
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8. 创建Controller（继承BaseController），在class上添加注解
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```java
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@Controller("/item")
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@RequestMapping("/item")
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@CrossOrigin(allowedHeaders = "*", allowCredentials = "true")
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```
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9. 创建Controller方法（添加以下注释）
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```java
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// POST
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@RequestMapping(value = "/create", method = {RequestMethod.POST}, consumes = {CONTENT_TYPE_FORMED})
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@ResponseBody
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// GET
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@RequestMapping(value = "/get", method = {RequestMethod.GET})
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@ResponseBody
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```
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10.
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