spring.md · 疯狂的码奴/spring-boot-source

### Servlet组件

- servlet
  - 实现
    - `@WebServlet`
    - `httpServlet`
    - 注册
  - url映射
    - `@WebServlet(urlPatterns = "/servlet")`
  - 注册
    - `@ServletComponentScan("com.sren.boot.servlet")`
- Filter
- Listener

### Servlet注册

#### servlet注解

- `@ServletComponentScan`
  - `@WebServlet`
  - `@WebFilter`
  - `@WebListener`

#### 异步非阻塞

```java
@WebServlet(urlPatterns = "/servlet", asyncSupported = true)
public class MyServlet extends HttpServlet {

@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		AsyncContext asyncContext = req.startAsync();
		asyncContext.start(()->{
			try {
				resp.getWriter().println("hello world");
				// 触发完成
				asyncContext.complete();
			} catch (IOException e) {
				e.printStackTrace();
			}
		});
	}
}
```

### Spring Web Mvc

#### Web MVC视图

- `ViewResolver`
- `View`

#### 模板引擎

- Thymeleaf
- Freemarker
- JSP

#### 内容协商

- `ContentNegotiatingViewResolver`
- `ContentNegotiationConfigurer`
- `ContentNegotiationStrategy`

#### 异常处理

- `ExceptionHandler`
- `HandlerExceptionResolver`
  - `ExceptionHandlerExceptionResolver`
- `BasicErrorController`

### Web MVC REST

#### 资源服务

- `@RequestMapping`
- `@ResponseBody`
- `@RequestBody`

#### 资源跨域

- `CrossOrigin`
- `WebMvcConfigurer#addCorsMappings`
- 传统解决方案
  - JSONP
  - IFrame

#### 服务发现

- HATEOS

### Web MVC 核心

#### 核心组件

- `DispatcherServlet`
- `HandlerMapping`
- `HandlerAdapter`
- `ViewResolver`

### Web Flux

Web MVC 注解兼容

#### 函数式编程

- `RouterFunction`

#### 异步非阻塞

- Servlet 3.1+
- Netty Reactor

#### 应用场景

##### 页面渲染

##### Rest应用

### Web Server应用

#### 切换Web Server

```
<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<version>2.3.0.BUILD-SNAPSHOT</version>
			<exclusions>
				<exclusion>
					<artifactId>spring-boot-starter-tomcat</artifactId>
					<groupId>org.springframework.boot</groupId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jetty</artifactId>
			<version>2.3.0.BUILD-SNAPSHOT</version>
		</dependency>

```

#### 自定义Servlet Web Server

- `WebServerFactoryCustomizer`

#### 自定义Reactive Web Server

- `ReactiveWebServerFactoryCustomizer`

### 数据相关

#### 关系型数据

##### JDBC

##### 依赖

```
<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
```

##### 数据源

- `DataSource`

##### 自动装配

- `DataSourceAutoConfiguration`

#### JPA

##### 依赖

```
<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <version>2.3.0.BUILD-SNAPSHOT</version>
</dependency>
```

##### 实体映射依赖

- `OneToOne`
- `OneToMany`
- `ManyToOne`
- `ManyToMany`

##### 实体操作

- `EntityManager`

##### 自动装配

- `HibernateJpaAutoConfiguration`

#### 事物

##### spring事物抽象

- `PlatformTransactionManager`

##### JDBC事物处理

- `DataSourceTransactionManager`

##### 自动装配

- `TransactionAutoConfiguration`

### Spring boot应用

#### springApplication

##### 失败分析

- `FailureAnalysisReporter`

##### springboot配置

- 外部化配置
  - `ConfigurationProperty`
- `@Profile`
- 配置属性
  - `PropertySource`

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