Spring @Enable模块驱动

Posted 2020-12-11 30rl

Spring @Enable 模块概览

 

框架实现	@Enable注解模块	激活模块
Spring Framework	@EnableWebMvc	Web MVC 模块
	@EnableTransactionManagement	事务管理模块
	@EnableCaching	Caching 模块
	@EnableMBeanExport	JMX 模块
	@EnableAsync	异步处理模块
	@EnableWebFlux	Web Flux 模块
	@EnableAspectJAutoProxy	AspectJ 代理模块
Spring Boot	@EnableAutoConfiguration	自动装配
	@EnableManagementContext	Actuator 管理模块
	@EnableConfigurationProperties	配置属性绑定模块
	@EnableOAuth2Sso	OAuth2 单点登录模块
Spring Cloud	@EnableEurekaServer	Eureka 服务器模块
	@EnableConfigServer	配置服务器模块
	@EnableFeignClients	Feign 客户端模块
	@EnableZuulProxy	服务网关Zuul 模块
	@EnableCircuitBreaker	服务熔断模块

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

理解 @Enable  以 @EnableWebMVC 为例进行理解

定义如下：

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@Import(DelegatingWebMvcConfiguration.class)
public @interface EnableWebMvc {
}

发现该注解中引入的 DelegatingWebMvcConfiguration.class

@Configuration(proxyBeanMethods = false)
public class DelegatingWebMvcConfiguration extends WebMvcConfigurationSupport {
...
}

public class WebMvcConfigurationSupport implements ApplicationContextAware, ServletContextAware {
@Bean
@SuppressWarnings("deprecation")
public RequestMappingHandlerMapping requestMappingHandlerMapping(
      @Qualifier("mvcContentNegotiationManager") ContentNegotiationManager contentNegotiationManager,
      @Qualifier("mvcConversionService") FormattingConversionService conversionService,
      @Qualifier("mvcResourceUrlProvider") ResourceUrlProvider resourceUrlProvider) {
      ...
}
...
}

其中 实现类  WebMvcConfigurationSupport.java 中 预定义了 多个 Spring Bean 对象,
随着 @EnableWebMVC 驱动注解的加载而被加载到 Spring 上下文中从而实现 Spring Web MVC的功能。