Feign

FeignClientsRegistrar implements ImportBeanDefinitionRegistrar

FeignClientsConfiguration

 1. feign.codec.Decoder 编解码 2. Encoder  编解码 3. SpringMvcContract  解析RequestMapping、RequestParam、RequestHeader注解 4. Retryer 重试器

EnableFeignClients

String[] basePackages() default {}; //扫描包路径Class<?>[] clients() default {};// 直接指定FeignClient类Class<?>[] defaultConfiguration() default {};

//导入FeignClientsRegistrar@Import(FeignClientsRegistrar.class) 

FeignAutoConfiguration

@EnableFeignClients

@Beanpublic FeignContext feignContext() {FeignContext context = new FeignContext();context.setConfigurations(this.configurations);return context;}