项目结构图

引入依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.2.11</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>org.example</groupId><artifactId>feignClient-starter</artifactId><version>0.0.1-SNAPSHOT</version><name>feignClient-starter</name><description>feignClient-starter</description><properties><java.version>17</java.version><spring-cloud.version>2023.0.3</spring-cloud.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin></plugins></build>
</project>

feignClient接口

package org.example.feignclientstarter.feign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
@FeignClient(value = "user-server")
public interface TestFeign {@GetMapping("/getUser")Object getUser(String str);
}

自动装配配置类

package org.example.feignclientstarter.config;
import org.example.feignclientstarter.feign.TestFeign;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.cloud.openfeign.FeignAutoConfiguration;
import org.springframework.context.ApplicationContext;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.env.StandardEnvironment;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.StandardAnnotationMetadata;
@Configurable
@EnableFeignClients(value = "org.example.feignclientstarter.config.feign", clients = TestFeign.class)
public class AutoConfiguration {AutoConfiguration(ApplicationContext context) {try {loadFeignClients(context);} catch (Exception e) {}}public void loadFeignClients(ApplicationContext context) throws Exception {AutowireCapableBeanFactory beanFactory = context.getAutowireCapableBeanFactory();Class<?> candidateClass = Class.forName("org.springframework.cloud.openfeign.FeignClientsRegistrar");ImportBeanDefinitionRegistrar registrar =BeanUtils.instantiateClass(candidateClass, ImportBeanDefinitionRegistrar.class);BeanDefinitionRegistry registry = null;if (beanFactory instanceof BeanDefinitionRegistry) {registry = (BeanDefinitionRegistry) beanFactory;}if (registrar instanceof EnvironmentAware) {EnvironmentAware envAware = (EnvironmentAware) registrar;envAware.setEnvironment(new StandardEnvironment());}final AnnotationMetadata metadata = new StandardAnnotationMetadata(FeignAutoConfiguration.class);registrar.registerBeanDefinitions(metadata, registry);}
}

业务方法Service

package org.example.feignclientstarter.service;
import lombok.experimental.Accessors;
import org.example.feignclientstarter.feign.TestFeign;
import org.springframework.stereotype.Service;
@Service
public class TestService {@Accessorsprivate TestFeign testFeign;public Object getUser(String str) {return testFeign.getUser(str);}
}

resource下建META-INF.spring.factories文件

org.springframework.boot.autoconfigure.EnableAutoConfiguration=org.example.feignclientstarter.config.AutoConfiguration

使用方法

在消费者服务中引入

<dependency><groupId>org.example</groupId><artifactId>feignClient-starter</artifactId><version>0.0.1-SNAPSHOT</version>
</dependency>