Feign-2覆写Feign的默认配置

现在我们来复写Feign的默认配置7.2 Overriding Feign Defaultshttps://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-feign.htmlSpring Cloud的Feign支持的一个中心是命名客户端,也就是我们可以为Client进行命名,每个FeignClient是整体的一部分,他们一起工作,按需联系远程服务器,并且该整体有一个名称,开发人员可以使用FeignClient进行命名A central concept in Spring Cloud’s Feign support is that of the named client. Each feign client is part of an ensemble of components that work together to contact a remote server on demand,and the ensemble has a name that you give it as an application developer using the @FeignClient annotation. @FeignClient("microservice-simple-provider-user")
public interface UserFeignClient {我们可以用这个进行命名org.springframework.cloud.netflix.feign.FeignClient/*** The service id with optional protocol prefix. Synonym for {@link #value() value}.*/
@AliasFor("value")
String name() default "";name其实他是value的别名,Spring Cloud按照需要,使用FeignClientsConfiguration为每个命名的客户端创建一个新的整体,FeignClientsConfiguration这个是FeignClient的默认配置类,/*** A custom <code>@Configuration</code> for the feign client. Can contain override* <code>@Bean</code> definition for the pieces that make up the client, for instance* {@link feign.codec.Decoder}, {@link feign.codec.Encoder}, {@link feign.Contract}.** @see FeignClientsConfiguration for the defaults*/
Class<?>[] configuration() default {};他默认就是FeignClientsConfiguration,为每一个命名的客户端建立一个新的整体作为ApplicationContext,我们知道Spring他是一个父子容器,我们通过FeignClient其实创建了一个子容器,他包含了feign.Decoder,feign.Encoder,feign.Contract,包含了解码器,编码器,和契约,Spring Cloud creates a new ensemble as an ApplicationContext on demand for each named client using FeignClientsConfiguration. This contains (amongst other things) an feign.Decoder, a feign.Encoder,and a feign.Contract.你可以用额外的声明,额外的配置,去完全控制Feign的配置Spring Cloud lets you take full control of the feign client by declaring additional configuration(on top of the FeignClientsConfiguration) using @FeignClient. Example:@FeignClient(name = "stores", configuration = FooConfiguration.class)
public interface StoreClient {//..
}FooConfiguration does not need to be annotated with @Configuration. However, if it is, then take care to exclude it from any @ComponentScan that would otherwise include this configuration as it will become the default source for feign.Decoder, feign.Encoder, feign.Contract, etc., when specified. This can be avoided by putting it in a separate, non-overlapping package from any @ComponentScan or @SpringBootApplication, or it can be explicitly excluded in @ComponentScan.The serviceId attribute is now deprecated in favor of the name attribute.@FeignClient("microservice-simple-provider-user")你这里用了name就不要用id了,/*** The service id with optional protocol prefix. Synonym for {@link #value() value}.** @deprecated use {@link #name() name} instead*/
@Deprecated
String serviceId() default "";以前你使用URL属性,name不是必须的,但是现在他是必须的了,Previously, using the url attribute, did not require the name attribute. Using name is now required./*** An absolute URL or resolvable hostname (the protocol is optional).*/
String url() default "";Placeholders are supported in the name and url attributes.@FeignClient(name = "${feign.name}", url = "${feign.url}")
public interface StoreClient {//..
}我这边只写url,没有写name,他还是不报错的,启动的时候就启动不来Spring Cloud Netflix provides the following beans by default for feign (BeanType beanName: ClassName):Decoder feignDecoder: ResponseEntityDecoder (which wraps a SpringDecoder)Encoder feignEncoder: SpringEncoderLogger feignLogger: Slf4jLoggerContract feignContract: SpringMvcContractFeign.Builder feignBuilder: HystrixFeign.BuilderClient feignClient: if Ribbon is enabled it is a LoadBalancerFeignClient, otherwise the default feign client is used.Spring Cloud Netflix项目呢,使用这些作为默认配置,解码器用的是ResponseEntityDecoder这个解码器,编码器用的是SpringEncoder这个编码器,Logger用的是Slf4jLogger这个Log,Contract用的是SpringMvcContract契约,所以他才可以使用SpringMVC的注解,如果你使用Ribbon的话,然后你还可以使用OkHttpClient,这也是一个非常火的一个项目,The OkHttpClient and ApacheHttpClient feign clients can be used by setting feign.okhttp.enabled or feign.httpclient.enabled to true, 下面是Spring Cloud没有进行默认配置的Spring Cloud Netflix does not provide the following beans by default for feign, but still looks up beans of these types from the application context to create the feign client:Logger.LevelRetryerErrorDecoderRequest.OptionsCollection<RequestInterceptor>SetterFactoryhttps://github.com/OpenFeign/feigninterface GitHub {@RequestLine("GET /repos/{owner}/{repo}/contributors")List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);@RequestLine("POST /repos/{owner}/{repo}/issues")void createIssue(Issue issue, @Param("owner") String owner, @Param("repo") String repo);}localhost:8010/movie/1

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><artifactId>microservice-consumer-movie-feign</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>microservice-simple-consumer-movie</name><description>Demo project for Spring Boot</description><parent><groupId>cn.learn</groupId><artifactId>microcloud02</artifactId><version>0.0.1</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-feign</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

#debug=true
server.port=8010eureka.client.serviceUrl.defaultZone=http://admin:1234@10.40.8.152:8761/eurekaspring.application.name=microservice-consumer-movie-ribbon
eureka.instance.prefer-ip-address=true
eureka.instance.instance-id=${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}
eureka.client.healthcheck.enabled=true
spring.redis.host=10.40.8.152
spring.redis.password=1234
spring.redis.port=6379#stores.ribbon.listOfServers=10.40.8.144:7900

package com.learn.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import feign.Contract;
import feign.Logger;@Configuration
public class Configuration1 {@Beanpublic Contract feignContract() {return new feign.Contract.Default();}@BeanLogger.Level feignLoggerLevel() {return Logger.Level.FULL;}
}

package com.learn.cloud.feign;import org.springframework.cloud.netflix.feign.FeignClient;import com.learn.cloud.entity.User;
import com.learn.config.Configuration1;import feign.Param;
import feign.RequestLine;@FeignClient(name = "microservice-simple-provider-user", configuration = Configuration1.class)
public interface UserFeignClient {@RequestLine("GET /simple/{id}")public User findById(@Param("id") Long id);}

package com.learn.cloud.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;import com.learn.cloud.entity.User;
import com.learn.cloud.feign.UserFeignClient;@RestController
public class MovieController {@Autowiredprivate UserFeignClient userFeignClient;@GetMapping("/movie/{id}")public User findById(@PathVariable Long id) {return this.userFeignClient.findById(id);}}

package com.learn.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ConsumerMovieFeignApplication {public static void main(String[] args) {SpringApplication.run(ConsumerMovieFeignApplication.class, args);}
}

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