title: SpringCloud集成Nacos实现服务发现
date: 2020-01-12 09:05:42
categories: Nacos
description: SpringCloud集成Nacos实现服务发现
1. 目录
2. 服务发现
本章节我通过在SpringCloud中写服务者（Provider，端口：9001）、消费者(Consumer，端口：9002)，来演示服务发现。
服务中消费者、服务提供者都需要添加这个依赖：
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>2.1. 服务提供者-Provider
编写这个，我们基于
SpringCloud集成Nacos实现配置管理 中的案例来改造
2.1.1. 添加POM依赖包
<dependencies>
<!--通用包依赖，一些Entity、Dao等-->
<dependency>
<groupId>xyz.wongs.weathertop</groupId>
<artifactId>persistence-domain</artifactId>
<version>1.0.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--Nacos配置中心-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--步骤1、这是新增：Nacos服务发现-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
</dependencies>2.1.2. resources文件夹
2.1.2.1. bootstrap.properties文件
//步骤2、服务名改一下
spring.application.name=discovery-nacos-provider
spring.profiles.active=dev
spring.cloud.nacos.config.group=CLOUD_GROUP
spring.cloud.nacos.config.server-addr=192.168.147.132:8848
spring.cloud.nacos.config.prefix=${spring.application.name}
spring.cloud.nacos.config.file-extension=yml
management.endpoints.web.exposure.include=*
//步骤3、新增配置
spring.cloud.nacos.discovery.server-addr=192.168.147.132:8848
2.1.2.2. application.yml文件
这里设定端口9001
server:
port: 9001
mybatis:
mapperLocations: classpath:mapper/**/*.xml2.1.3. 新增配置项
将Data Id中cofig-nacos-dev.yml配置复制一份，重命名为discovery-nacos-provider-dev.yml。
2.1.4. 应用入口
@RefreshScope
@MapperScan(basePackages = {"xyz.wongs.weathertop.**.mapper"})
@EnableDiscoveryClient
@SpringBootApplication
public class DiscoveryProviderApp {
public static void main(String[] args) {
SpringApplication.run(DiscoveryProviderApp.class,args);
}
}2.1.5. 启动项目
在浏览器打开地址：http://localhost:9001/locations/0
生产者启动成功
再打开Nacos控制台“服务管理->服务列表”，有discovery-nacos-provider这个服务名，说明服务已经注册到Nacos。
2.2. 源码
消费者Github演示源码 ，记得给Star
3. 服务消费者
3.1. resources文件夹
3.1.1. bootstrap.properties
spring.application.name=discovery-nacos-consumer
spring.profiles.active=dev
spring.cloud.nacos.discovery.server-addr=192.168.147.132:8848
management.endpoints.web.exposure.include=*3.1.2. application.yml
我们设定端口9002
server:
port: 90023.2. Bean注册
我们利用SpringBoot管理Bean的便捷性，来对RestTemplate实例进行管理，利用它的LoadBalanced注解来实现负载均衡。
@EnableDiscoveryClient
@SpringBootApplication
public class DiscoveryConsumerrApp {
public static void main(String[] args) {
SpringApplication.run(DiscoveryConsumerrApp.class,args);
}
@LoadBalanced
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
}3.3. 调用生产者
@RestController
@RequestMapping(value = "/locations")
public class LocationController extends BaseController {
@Autowired
private RestTemplate restTemplate;
@GetMapping(value = "/consumer/{lv}")
public ResponseResult echo(@PathVariable(value = "lv") Integer lv) {
return restTemplate.getForObject("http://discovery-nacos-provider/locations/" + lv, ResponseResult.class);
}
}restTemplate.getForObject(String url, Class responseType, Object... uriVariables)
- url：地址名，这里一定要填写Nacos服务列表中的服务名
- responseType： 返回数据类型，由于我使用了统一类型来返回数据，这里大家根据实际内容自行更改
3.4. 验证服务
打开浏览器，输入我们的地址：http://localhost:9002/locations/consumer/0 ，
控制台中日志有刷新：
2019-12-15 18:19:53.140 INFO 22048 --- [tp2060799061-34] c.n.l.DynamicServerListLoadBalancer : DynamicServerListLoadBalancer for client discovery-nacos-provider initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=discovery-nacos-provider,current list of Servers=[192.168.68.235:9001],Load balancer stats=Zone stats: {unknown=[Zone:unknown; Instance count:1; Active connections count: 0; Circuit breaker tripped count: 0; Active connections per server: 0.0;]
},Server stats: [[Server:192.168.68.235:9001; Zone:UNKNOWN; Total Requests:0; Successive connection failure:0; Total blackout seconds:0; Last connection made:Thu Jan 01 08:00:00 CST 1970; First connection made: Thu Jan 01 08:00:00 CST 1970; Active Connections:0; total failure count in last (1000) msecs:0; average resp time:0.0; 90 percentile resp time:0.0; 95 percentile resp time:0.0; min resp time:0.0; max resp time:0.0; stddev resp time:0.0]
]}ServerList:org.springframework.cloud.alibaba.nacos.ribbon.NacosServerList@66588ff
2019-12-15 18:19:54.121 INFO 22048 --- [erListUpdater-0] c.netflix.config.ChainedDynamicProperty : Flipping property: discovery-nacos-provider.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
3.5. 源码
消费者Github演示源码 ，记得给Star
