Micro Spring Cloud Services Development: Getting Started, Advanced and source code analysis - 3.2 Spring Cloud Feign advanced, combat

3.2 Spring Cloud Feign advanced, combat

3.2.1 Feign works

Start 1. Check whether there @EnableFeignClients annotation configuration, and open the package scanning, scanning is @FeignClient annotation interface. After the annotation scanned by IOC beanDefinition poured into the container, to facilitate subsequent use is invoked.

In org.springframework.cloud.openfeign.FeignClientsRegistrarclass, registerFeignClients () method feign the registration operation is completed.

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public void registerFeignClients(AnnotationMetadata metadata,
			BeanDefinitionRegistry registry) {
		ClassPathScanningCandidateComponentProvider scanner = getScanner()