Nacos(服务注册与服务配置)

安装Nacos

官网下载Nacos安装包并解压,直接运行bin目录下的startup.cmd -m standalone(standalone:单机模式，非集群)。

访问地址:http://localhost:8848/nacos 账号密码默认为nacos

Nacos Discovery服务注册中心

新建生产者模块:

package com.wen.cloud.controller;import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;@RestController
public class PayGateWayController
{@Value("${server.port}")private String serverPort;@GetMapping(value = "/pay/nacos/{id}")public String getPayInfo(@PathVariable("id") Integer id){return "nacos registry, serverPort: "+ serverPort+"\t id"+id;}
}

导入依赖:

 <!--nacos-discovery--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency>

yml文件配置:

server:port: 9001spring:application:name: nacos-payment-providercloud:nacos:discovery:server-addr: localhost:8848 #配置Nacos地址

新建消费者模块:

导入依赖:

 <!--nacos-discovery--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><!--loadbalancer--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-loadbalancer</artifactId></dependency>

测试类:

package com.wen.cloud.controller;import jakarta.annotation.Resource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;@RestController
public class OrderNacosController
{@Resourceprivate RestTemplate restTemplate;@Value("${service-url.nacos-user-service}")private String serverURL;@GetMapping("/consumer/pay/nacos/{id}")public String paymentInfo(@PathVariable("id") Integer id){String result = restTemplate.getForObject(serverURL + "/pay/nacos/" + id, String.class);return result+"\t"+"    我是OrderNacosController83调用者。。。。。。";}
}

配置restTemplate

package com.wen.cloud.config;import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;@Configuration
public class RestTemplateConfig
{@Bean@LoadBalanced //赋予RestTemplate负载均衡的能力public RestTemplate restTemplate(){return new RestTemplate();}
}

yml文件配置:

server:port: 83spring:application:name: cloudalibaba-consumer-nacos-order83cloud:nacos:discovery:server-addr: localhost:8848 #配置Nacos地址
#消费者将要去访问的微服务名称(nacos微服务提供者叫什么你写什么)
service-url:nacos-user-service: http://nacos-payment-provider

测试:

nacos注册中心

负载均衡

Nacos config服务配置中心:

通过Nacos和spring-cloud-starter-alibaba-nacos-config实现中心化全局配置的动态变更。

导入依赖:

<!--bootstrap--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-bootstrap</artifactId></dependency><!--nacos-config--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId></dependency><!--nacos-discovery--><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><!--web + actuator--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency>

修改配置文件application和bootStrap(bootStrap优先级大于application)

application：

server:port: 3377spring:profiles:active: dev # 表示开发环境#active: prod # 表示生产环境#active: test # 表示测试环

bootStrap


# nacos配置
spring:application:name: nacos-config-clientcloud:nacos:discovery:server-addr: localhost:8848 #Nacos服务注册中心地址config:server-addr: localhost:8848 #Nacos作为配置中心地址file-extension: yaml #指定yaml格式的配置# nacos端配置文件DataId的命名规则是：
# ${spring.application.name}-${spring.profile.active}.${spring.cloud.nacos.config.file-extension}
# 本案例的DataID是:nacos-config-client-dev.yaml

测试类:

package com.wen.cloud.controller;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;@RestController
@RefreshScope //在控制器类加入@RefreshScope注解使当前类下的配置支持Nacos的动态刷新功能。
public class NacosConfigClientController
{@Value("${config.info}")private String configInfo;@GetMapping("/config/info")public String getConfigInfo() {return configInfo;}
}