Spring Cloud OpenFeign 功能

@SpringBootApplication
@EnableFeignClients
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}

}

@FeignClient("stores")
public interface StoreClient {
	@RequestMapping(method = RequestMethod.GET, value = "/stores")
	List<Store> getStores();

	@GetMapping("/stores")
	Page<Store> getStores(Pageable pageable);

	@PostMapping(value = "/stores/{storeId}", consumes = "application/json",
				params = "mode=upsert")
	Store update(@PathVariable("storeId") Long storeId, Store store);

	@DeleteMapping("/stores/{storeId:\\d+}")
	void delete(@PathVariable Long storeId);
}

@FeignClient(name = "stores", configuration = FooConfiguration.class)
public interface StoreClient {
	//..
}

@FeignClient(name = "${feign.name}", url = "${feign.url}")
public interface StoreClient {
	//..
}

@Configuration
public class FooConfiguration {

	@Bean
	public HttpClient5FeignConfiguration.HttpClientBuilderCustomizer httpClientBuilder() {
		return (httpClientBuilder) -> {
			RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
			requestConfigBuilder.setProtocolUpgradeEnabled(false);
			httpClientBuilder.setDefaultRequestConfig(requestConfigBuilder.build());
		};
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	public Contract feignContract() {
		return new feign.Contract.Default();
	}

	@Bean
	public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
		return new BasicAuthRequestInterceptor("user", "password");
	}
}

spring:
	cloud:
		openfeign:
			client:
				config:
					feignName:
                        url: http://remote-service.com
						connectTimeout: 5000
						readTimeout: 5000
						loggerLevel: full
						errorDecoder: com.example.SimpleErrorDecoder
						retryer: com.example.SimpleRetryer
						defaultQueryParameters:
							query: queryValue
						defaultRequestHeaders:
							header: headerValue
						requestInterceptors:
							- com.example.FooRequestInterceptor
							- com.example.BarRequestInterceptor
						responseInterceptor: com.example.BazResponseInterceptor
						dismiss404: false
						encoder: com.example.SimpleEncoder
						decoder: com.example.SimpleDecoder
						contract: com.example.SimpleContract
						capabilities:
							- com.example.FooCapability
							- com.example.BarCapability
						queryMapEncoder: com.example.SimpleQueryMapEncoder
						micrometer.enabled: false

spring:
	cloud:
		openfeign:
			client:
				config:
					default:
						connectTimeout: 5000
						readTimeout: 5000
						loggerLevel: basic

@FeignClient(contextId = "fooClient", name = "stores", configuration = FooConfiguration.class)
public interface FooClient {
	//..
}

@FeignClient(contextId = "barClient", name = "stores", configuration = BarConfiguration.class)
public interface BarClient {
	//..
}

@Configuration
public class CustomConfiguration {
	@Bean
	public FeignClientConfigurer feignClientConfigurer() {
		return new FeignClientConfigurer() {
			@Override
			public boolean inheritParentConfiguration() {
				 return false;
			}
		};
	}
}

@Import(FeignClientsConfiguration.class)
class FooController {

	private FooClient fooClient;

	private FooClient adminClient;

	@Autowired
	public FooController(Client client, Encoder encoder, Decoder decoder, Contract contract, MicrometerObservationCapability micrometerObservationCapability) {
		this.fooClient = Feign.builder().client(client)
				.encoder(encoder)
				.decoder(decoder)
				.contract(contract)
				.addCapability(micrometerObservationCapability)
				.requestInterceptor(new BasicAuthRequestInterceptor("user", "user"))
				.target(FooClient.class, "https://PROD-SVC");

		this.adminClient = Feign.builder().client(client)
				.encoder(encoder)
				.decoder(decoder)
				.contract(contract)
				.addCapability(micrometerObservationCapability)
				.requestInterceptor(new BasicAuthRequestInterceptor("admin", "admin"))
				.target(FooClient.class, "https://PROD-SVC");
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	@Scope("prototype")
	public Feign.Builder feignBuilder() {
		return Feign.builder();
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	public CircuitBreakerNameResolver circuitBreakerNameResolver() {
		return (String feignClientName, Target<?> target, Method method) -> feignClientName + "_" + method.getName();
	}
}

@FeignClient(url = "http://localhost:8080")
public interface DemoClient {

    @GetMapping("demo")
    String getDemo();
}

spring:
  cloud:
    openfeign:
      circuitbreaker:
        enabled: true
        alphanumeric-ids:
          enabled: true
resilience4j:
  circuitbreaker:
    instances:
      DemoClientgetDemo:
        minimumNumberOfCalls: 69
  timelimiter:
    instances:
      DemoClientgetDemo:
        timeoutDuration: 10s

@FeignClient(name = "test", url = "http://localhost:${server.port}/", fallback = Fallback.class)
protected interface TestClient {

	@GetMapping("/hello")
	Hello getHello();

	@GetMapping("/hellonotfound")
	String getException();

}

@Component
static class Fallback implements TestClient {

	@Override
	public Hello getHello() {
		throw new NoFallbackAvailableException("Boom!", new RuntimeException());
	}

	@Override
	public String getException() {
		return "Fixed response";
	}

}

@FeignClient(name = "testClientWithFactory", url = "http://localhost:${server.port}/",
			fallbackFactory = TestFallbackFactory.class)
protected interface TestClientWithFactory {

	@GetMapping("/hello")
	Hello getHello();

	@GetMapping("/hellonotfound")
	String getException();

}

@Component
static class TestFallbackFactory implements FallbackFactory<FallbackWithFactory> {

	@Override
	public FallbackWithFactory create(Throwable cause) {
		return new FallbackWithFactory();
	}

}

static class FallbackWithFactory implements TestClientWithFactory {

	@Override
	public Hello getHello() {
		throw new NoFallbackAvailableException("Boom!", new RuntimeException());
	}

	@Override
	public String getException() {
		return "Fixed response";
	}

}

@FeignClient(name = "hello", primary = false)
public interface HelloClient {
	// methods here
}

public interface UserService {

	@GetMapping("/users/{id}")
	User getUser(@PathVariable("id") long id);
}

@RestController
public class UserResource implements UserService {

}

@FeignClient("users")
public interface UserClient extends UserService {

}

spring.cloud.openfeign.compression.request.enabled=true
spring.cloud.openfeign.compression.response.enabled=true

spring.cloud.openfeign.compression.request.enabled=true
spring.cloud.openfeign.compression.request.mime-types=text/xml,application/xml,application/json
spring.cloud.openfeign.compression.request.min-request-size=2048

logging.level.project.user.UserClient: DEBUG

@Configuration
public class FooConfiguration {
	@Bean
	Logger.Level feignLoggerLevel() {
		return Logger.Level.FULL;
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	Capability customCapability() {
		return new CustomCapability();
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	public MicrometerObservationCapability micrometerObservationCapability(ObservationRegistry registry) {
		return new MicrometerObservationCapability(registry);
	}
}

@Configuration
public class FooConfiguration {
	@Bean
	public MicrometerCapability micrometerCapability(MeterRegistry meterRegistry) {
		return new MicrometerCapability(meterRegistry);
	}
}

public interface DemoClient {

	@GetMapping("/demo/{filterParam}")
    @Cacheable(cacheNames = "demo-cache", key = "#keyParam")
	String demoEndpoint(String keyParam, @PathVariable String filterParam);
}

@FeignClient("demo")
public interface DemoTemplate {

        @PostMapping(value = "/stores/{storeId}", params = "mode=upsert")
        Store update(@PathVariable("storeId") Long storeId, Store store);
}

// Params.java
public class Params {
	private String param1;
	private String param2;

	// [Getters and setters omitted for brevity]
}

@FeignClient("demo")
public interface DemoTemplate {

	@GetMapping(path = "/demo")
	String demoEndpoint(@SpringQueryMap Params params);
}

@FeignClient("demo")
public interface DemoTemplate {

	@GetMapping(path = "/stores")
	CollectionModel<Store> getStores();
}

@GetMapping("/objects/links/{matrixVars}")
Map<String, List<String>> getObjects(@MatrixVariable Map<String, List<String>> matrixVars);

@FeignClient("demo")
public interface DemoTemplate {

	@GetMapping(path = "/stores")
	CollectionModel<Store> getStores();
}

@FeignClient(name = "demo")
protected interface DemoFeignClient {

    @CollectionFormat(feign.CollectionFormat.CSV)
    @GetMapping(path = "/test")
    ResponseEntity performRequest(String test);

}

spring.cloud.openfeign.autoconfiguration.jackson.enabled=false

spring.cloud.openfeign.client.refresh-enabled=true

spring.cloud.openfeign.oauth2.enabled=true

@Bean
public LoadBalancerFeignRequestTransformer transformer() {
	return new LoadBalancerFeignRequestTransformer() {

		@Override
		public Request transformRequest(Request request, ServiceInstance instance) {
			Map<String, Collection<String>> headers = new HashMap<>(request.headers());
			headers.put("X-ServiceId", Collections.singletonList(instance.getServiceId()));
			headers.put("X-InstanceId", Collections.singletonList(instance.getInstanceId()));
			return Request.create(request.httpMethod(), request.url(), headers, request.body(), request.charset(),
					request.requestTemplate());
		}
	};
}

spring.cloud.loadbalancer.x-forwarded.enabled=true