SpringCloud集成Nacos实现服务发现

Rothschil 2020-01-12 09:05:42
Nacos

1. 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：

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

1.1. 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

1.1.1. 添加POM依赖包

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<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>

1.1.2. resources文件夹

1.1.2.1. bootstrap.properties文件

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//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

1.1.2.2. application.yml文件

这里设定端口9001

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server:
  port: 9001

mybatis:
  mapperLocations: classpath:mapper/**/*.xml

1.1.3. 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。

discovery-nacos-provider-dev.yml

1.1.4. 应用入口

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@RefreshScope
@MapperScan(basePackages = {"xyz.wongs.weathertop.**.mapper"})
@EnableDiscoveryClient
@SpringBootApplication
public class DiscoveryProviderApp {
    public static void main(String[] args) {
        SpringApplication.run(DiscoveryProviderApp.class,args);
    }
}

1.1.5. 启动项目

在浏览器打开地址：http://localhost:9001/locations/0

验证服务

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。

服务提供者

1.2. 源码

消费者Github演示源码 ，记得给Star

2. 服务消费者

2.1. resources文件夹

2.1.1. bootstrap.properties

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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=*

2.1.2. application.yml

我们设定端口9002

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server:
  port: 9002

2.2. 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。

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@EnableDiscoveryClient
@SpringBootApplication
public class DiscoveryConsumerrApp {
    public static void main(String[] args) {
        SpringApplication.run(DiscoveryConsumerrApp.class,args);
    }

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

2.3. 调用生产者

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@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)

2.4. 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：

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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

查看数据!

2.5. 源码

消费者Github演示源码 ，记得给Star

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SpringCloud集成Nacos实现配置管理