springcloud使用nacos作为注册中心用openfeign调用服务

• pom.xml文件如下，这是最简洁版的，根据自己的需求添加（如mysql驱动等）

<?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>2.3.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.hao</groupId>
	<artifactId>springboot-nacos</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot-nacos</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
	
        <!--boot-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
        <!--boot项目检查检查-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!--openfeign(服务调用)  @FeignClient 使用-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.2.2.RELEASE</version>
        </dependency>
        
        <!--nacos+cloud-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>

	</dependencies>
	
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
	
</project>

• application.yml文件如下，同样是最简洁版的

spring:
  cloud:
    nacos:
      discovery:
        ###服务注册地址
        server-addr: 127.0.0.1:8848
  application: ##服务名称
    name: springboot-nacos01

server:
  port: 8081

• 主启动类

package com.hao.springbootnacos;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients(basePackages ="com.hao.springbootnacos.service")#服务调用接口类的目录
public class SpringbootNacosApplication {

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

}

• com.hao.springbootnacos.service包下的调用其他服务的类

package com.hao.springbootnacos.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;

@Service
@FeignClient(value = "cloud-payment-service")#另外一个注册在注册中心的服务名
public interface ParmentService {

    @GetMapping("/getPayMent")#服务接口
    public Object getPayMent(@RequestParam("s") String s);
}

• 服务启动后可在注册中心发现此服务
  
• controller测试调用

package com.hao.springbootnacos.controller;

import com.hao.springbootnacos.service.ParmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class ParmentController {


    @Autowired
    private ParmentService parmentService;#带@FeignClient的那个服务接口

   @GetMapping("/getParment")
   public Object getParment(){

       Object payMent = parmentService.getPayMent();#调用服务

       System.out.println("payMent:"+payMent);

       return payMent;

   }
}