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Snailclimb merged 1 commit into from
Aug 23, 2020
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Update spring-annotations.md #898

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13 changes: 6 additions & 7 deletions docs/system-design/framework/spring/spring-annotations.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,10 +7,10 @@
- [1. `@SpringBootApplication`](#1-springbootapplication)
- [2. Spring Bean 相关](#2-spring-bean-%e7%9b%b8%e5%85%b3)
- [2.1. `@Autowired`](#21-autowired)
- [2.2. `Component`,`@Repository`,`@Service`, `@Controller`](#22-componentrepositoryservice-controller)
- [2.2. `@Component`,`@Repository`,`@Service`, `@Controller`](#22-componentrepositoryservice-controller)
- [2.3. `@RestController`](#23-restcontroller)
- [2.4. `@Scope`](#24-scope)
- [2.5. `Configuration`](#25-configuration)
- [2.5. `@Configuration`](#25-configuration)
- [3. 处理常见的 HTTP 请求类型](#3-%e5%a4%84%e7%90%86%e5%b8%b8%e8%a7%81%e7%9a%84-http-%e8%af%b7%e6%b1%82%e7%b1%bb%e5%9e%8b)
- [3.1. GET 请求](#31-get-%e8%af%b7%e6%b1%82)
- [3.2. POST 请求](#32-post-%e8%af%b7%e6%b1%82)
Expand Down Expand Up @@ -130,14 +130,14 @@ public class UserController {
}
```

#### 2.2. `Component`,`@Repository`,`@Service`, `@Controller`
#### 2.2. `@Component`,`@Repository`,`@Service`, `@Controller`

我们一般使用 `@Autowired` 注解让 Spring 容器帮我们自动装配 bean。要想把类标识成可用于 `@Autowired` 注解自动装配的 bean 的类,可以采用以下注解实现：

- `@Component` ：通用的注解，可标注任意类为 `Spring` 组件。如果一个 Bean 不知道属于哪个层，可以使用`@Component` 注解标注。
- `@Repository` : 对应持久层即 Dao 层，主要用于数据库相关操作。
- `@Service` : 对应服务层，主要涉及一些复杂的逻辑，需要用到 Dao 层。
- `@Controller` : 对应 Spring MVC 控制层，主要用户接受用户请求并调用 Service 层返回数据给前端页面。
- `@Controller` : 对应 Spring MVC 控制层，主要用于接受用户请求并调用 Service 层返回数据给前端页面。

#### 2.3. `@RestController`

Expand Down Expand Up @@ -168,9 +168,9 @@ public Person personSingleton() {
- request : 每一次 HTTP 请求都会产生一个新的 bean，该 bean 仅在当前 HTTP request 内有效。
- session : 每一次 HTTP 请求都会产生一个新的 bean，该 bean 仅在当前 HTTP session 内有效。

#### 2.5. `Configuration`
#### 2.5. `@Configuration`

一般用来声明配置类，可以使用 `@Component`注解替代，不过使用`Configuration`注解声明配置类更加语义化。
一般用来声明配置类，可以使用 `@Component`注解替代，不过使用`@Configuration`注解声明配置类更加语义化。

```java
@Configuration
Expand Down Expand Up @@ -302,7 +302,6 @@ public class UserRegisterRequest {
private String userName;
@NotBlank
private String password;
@FullName
@NotBlank
private String fullName;
}
Expand Down