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注意事项
参考资源
Nacos配置中心
初始化项目
进行Nacos相关配置
运行
Nacos注册中心
dubbo方式
对外暴露接口dubbo-api
服务提供者dubbo-provider
服务消费者dubbo-consumer
负载均衡客户端方法
服务提供者
服务消费者 注意事项
不管是使用Nacos配置中心还是使用Nacos注册中心大家一定要注意SpringCloudAlibaba和SpringBoot的版本对应关系以免实际开发过程中出现各种莫名其妙的问题。下图供大家参考(非最新的对应关系) 参考资源
Nacos环境准备参考官网链接Nacos 快速开始 | Nacos
Nacos配置中心和注册中心底层原理实现分析可参考如下链接
SpringCloudAlibaba系列之Nacos配置管理
SpringCloudAlibaba系列之Nacos服务注册与发现
示例代码源码参考地址https://gitee.com/williamjava/spring_cloud_alibaba_practise Nacos配置中心
初始化项目
核心maven依赖
dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-config/artifactId
/dependencydependencyManagementdependenciesdependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversionHoxton.SR4/versiontypepom/typescopeimport/scope/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2.2.1.RELEASE/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement
增加项目中配置文件yml
spring:application:name: alibaba-nacos-config-clientcloud:nacos:config:server-addr: localhost:8848file-extension: yamlserver:port: 8604 创建测试Controller
package com.gui.alibaba.nacos.config.controller;import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;/*** 注解RefreshScope* 主要用来让这个类下的配置内容支持动态刷新也就是当我们的应用启动之后修改了Nacos中的配置内容之后这里也会马上生效*/
Slf4j
RestController
RefreshScope
public class TestController {Value(${practise.title:本地默认内容})private String title;GetMapping(/test)public String hello() {return title;}
}
进行Nacos相关配置
Nacos控制台增加配置文件配置文件名称(Data ID)与spring.application.name保持一致具体内容如下 运行
启动项目浏览器访问http://localhost:8604/test 我们得到了配置中心中配置的内容如果Nacos控制台直接修改配置的内容刷新页面能实时获取到最新的数据起关键作用的是RefreshScope注解可动态刷新Nacos配置。 Nacos注册中心
dubbo方式
对外暴露接口dubbo-api
package com.sc.ali.dubbo.api;public interface HelloService {String hello(String name);
}
服务提供者dubbo-provider
核心maven依赖
!-- Dubbo Spring Cloud Starter --dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-dubbo/artifactId/dependency!-- Spring Cloud Nacos Service Discovery --dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-discovery/artifactId/dependency!--API--dependencygroupIdcom.ali.sc.dubbo.api/groupIdartifactIddubbo-api/artifactIdversion1.0-SNAPSHOT/version/dependencydependencyManagementdependenciesdependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversionHoxton.SR4/versiontypepom/typescopeimport/scope/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2.2.1.RELEASE/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement 项目中配置文件yml
spring:application:name: dubbo-providercloud:nacos:discovery:#nacos配置中心地址server-addr: localhost:8848main:allow-bean-definition-overriding: trueserver:port: 8090
dubbo:scan:#dubbo扫描包路径base-packages: com.sc.ali.dubbo.provider.serviceprotocol:name: dubboport: -1registry:address: spring-cloud://localhost
服务实现类
package com.sc.ali.dubbo.provider.service;import com.sc.ali.dubbo.api.HelloService;
import org.apache.dubbo.config.annotation.Service;Service
public class HelloServiceImpl implements HelloService {Overridepublic String hello(String s) {return Hello, s welcome....;}
} 启动服务提供者
Nacos工作台服务列表中可看到服务提供者对应的服务。 服务消费者dubbo-consumer
核心maven依赖
!-- Dubbo Spring Cloud Starter --dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-dubbo/artifactId/dependency!-- Spring Cloud Nacos Service Discovery --dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-discovery/artifactId/dependency!--API--dependencygroupIdcom.ali.sc.dubbo.api/groupIdartifactIddubbo-api/artifactIdversion1.0-SNAPSHOT/version/dependencydependencyManagementdependenciesdependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversionHoxton.SR4/versiontypepom/typescopeimport/scope/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2.2.1.RELEASE/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement
项目中配置文件yml
spring:application:name: dubbo-consumercloud:nacos:discovery:#Nacos服务注册中心地址server-addr: localhost:8848main:allow-bean-definition-overriding: trueserver:port: 8091
dubbo:protocol:name: dubboport: -1registry:address: spring-cloud://localhostcloud:#指定需要订阅的服务subscribed-services: dubbo-provider
添加测试controller完成服务调用
package com.sc.ali.dubbo.consumer.controller;import com.sc.ali.dubbo.api.HelloService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;RestController
public class HelloController{Referenceprivate HelloService helloService;GetMapping(/hello)public String hello(String name) {return helloService.hello(name);}
} 运行输出结果 负载均衡客户端方法
服务提供者
核心maven依赖
dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-discovery/artifactId/dependencydependencyManagementdependenciesdependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversionHoxton.SR4/versiontypepom/typescopeimport/scope/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2.2.1.RELEASE/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement
项目中配置文件yml
spring:application:name: alibaba-nacos-discovery-servercloud:nacos:#Nacos注册中心地址server-addr: localhost:8848server:port: 8601 对外暴露的服务方法
package com.gui.alibaba.nacos.discovery.controller;import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;RestController
Slf4j
public class TestController {GetMapping(/hello)public String hello(RequestParam String name) {log.info(invoked name name);return hello name;}
}
启动服务提供者
Nacos工作台服务列表可找到对应的服务 服务消费者
核心maven依赖
dependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-starter-alibaba-nacos-discovery/artifactId/dependencydependencyManagementdependenciesdependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-dependencies/artifactIdversionHoxton.SR4/versiontypepom/typescopeimport/scope/dependencydependencygroupIdcom.alibaba.cloud/groupIdartifactIdspring-cloud-alibaba-dependencies/artifactIdversion2.2.1.RELEASE/versiontypepom/typescopeimport/scope/dependency/dependencies/dependencyManagement
项目中配置文件yml
spring:application:name: alibaba-nacos-discovery-clientcloud:nacos:discovery:server-addr: localhost:8848server:port: 8602 添加测试controller完成服务调用
package com.gui.alibaba.nacos.client.controller;import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;RestController
Slf4j
public class TestController {Autowiredprivate LoadBalancerClient loadBalancerClient;GetMapping(/test)public String test() {// 通过spring cloud common中的负载均衡接口选取服务提供节点实现接口调用ServiceInstance serviceInstance loadBalancerClient.choose(alibaba-nacos-discovery-server);//构造请求URLString url serviceInstance.getUri() /hello?name william;//创建RestTemplate对象通过Restful接口调用具体服务RestTemplate restTemplate new RestTemplate();String result restTemplate.getForObject(url, String.class);return Invoke : url , return : result;}
}
运行输出结果
