0.9.0.RELEASE版本的spring cloud alibaba nacos+feign实例

　　这里的feign依然是原来的feign，只不过将注册中心由eureka换成了nacos。服务提供方参见0.9.0.RELEASE版本的spring cloud alibaba nacos实例，消费方跟提供方一样，只需加入feign的相关内容即可。抡出三板斧：

　　1、pom加入feign：

<?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>

    <groupId>com.wlf</groupId>

    <artifactId>spring-cloud-alibaba-consumer</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.7.RELEASE</version>

    </parent>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>Greenwich.SR2</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-alibaba-dependencies</artifactId>

                <version>0.9.0.RELEASE</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <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.cloud</groupId>

            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-openfeign</artifactId>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

　　2、application同服务提供方，只需注册到nacos即可：

#端口

server.port=8383

#应用名

spring.application.name=lxytrans-consumer

#注册中心

spring.cloud.nacos.discovery.server-addr=localhost:8848

　　3、启动类中加入注解@EnableFeignClients，引入服务提供方接口，并通过注解指向服务提供方服务实例@FeignClient("lxytrans-provider")：

import lombok.extern.slf4j.Slf4j;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.openfeign.EnableFeignClients;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@EnableFeignClients

@EnableDiscoveryClient

@SpringBootApplication

public class TransConsumerApplication {

    public static void main(String[] args) {

        SpringApplication.run(TransConsumerApplication.class, args);

    }

    @Slf4j

    @RestController

    static class TestController {

        @Autowired

        private ApplicationApi applicationApi;

        @GetMapping("/sayhello")

        public String sayhello() {

            return "say: " + applicationApi.hello();

        }

    }

    @FeignClient("lxytrans-provider")

    interface ApplicationApi {

        @GetMapping("/hello")

        String hello();

    }

}

　　消费者跑起来后可在nacos中看到：

　　通过消费方调用提供方：