nacos服務注冊與發現及服務配置實現

Nacos 提供了一組簡單易用的特性集，可快速實現動態服務發現、服務配置、服務元數據及流量管理。

更敏捷和容易地構建、交付和管理微服務平台。

關鍵特性：

　　服務發現和服務健康監測

　　動態配置服務

　　動態 DNS 服務

　　服務及其元數據管理

1.啟動服務

下載 地址

解壓

雙擊 startup.cmd

2.服務端provider

（1）添加依賴

　　 <properties>
        <java.version>1.8</java.version>
        <nacos.version>2.1.1.RELEASE</nacos.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${nacos.version}</version>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

（2）添加配置

server.port=8010
spring.application.name=service-provider
spring.cloud.nacos.discovery.enabled=true
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.discovery.service=${spring.application.name}
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

（3）測試方法

package com.xyz.provider1.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class demoController {
    @RequestMapping("/hello")
    public String Hello(){
        return "hello, provider";
    }

}

再添加provider1，端口8011，測試方法輸出

"hello,another provider"

3.客戶端customer

(1)添加依賴

　　<properties>
        <java.version>1.8</java.version>
        <nacos.version>2.1.1.RELEASE</nacos.version>
        <spring-cloud.version>Greenwich.SR4</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${nacos.version}</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

（2）添加配置

server.port=8015
spring.application.name=service-comsumer

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

spring.cloud.nacos.discovery.enabled=true
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.discovery.service=${spring.application.name}

#service-provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule

spring.cloud.nacos.config.server-addr=127.0.0.1:8848
spring.cloud.nacos.config.file-extension=properties

（3）測試方法

package com.xyz.comsumer.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RefreshScope
@RestController
public class HelloController {
    @Autowired
    private LoadBalancerClient loadBalancer;
    @Autowired
    private DiscoveryClient discoveryClient;
    private String serviceName = "service-provider";

    /**
     * 獲取所有服務
     */
    @RequestMapping("/services")
    public Object services() {
        return discoveryClient.getInstances(serviceName);
    }

    /**
     * 從所有服務中選擇一個服務（輪詢）
     */
    @RequestMapping("/discover")
    public Object discover() {
        return loadBalancer.choose(serviceName).getUri().toString();
    }

    @RequestMapping("/hello")
    public String hello() {
        ServiceInstance serviceInstance = loadBalancer.choose(serviceName);
        String callServiceResult = new RestTemplate().getForObject(serviceInstance.getUri().toString() + "/hello", String.class);
        callServiceResult += ",throw service";
        return callServiceResult;
    }

}

4.網關Zuul

（1）添加依賴

<properties>
        <java.version>1.8</java.version>
        <nacos.version>2.1.1.RELEASE</nacos.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${nacos.version}</version>
        </dependency>

    </dependencies>

（2）添加配置

server.port=8090

spring.application.name=service-zuul

spring.cloud.nacos.discovery.enabled=true
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.discovery.service=${spring.application.name}

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

zuul.routes.api.path=/api/**
zuul.routes.api.serviceId=service-provider

（3）啟動類

package com.xyz.zuul;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableZuulProxy
@SpringBootApplication
public class ZuulApplication {

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

}

4.測試

啟動provider，provider1，customer

http://localhost:8848/nacos/   ，用戶名nacos，密碼nacos

http://localhost:8090/api/hello

交替返回

hello,provider或hello,another provider

5.修改客戶端，添加統一配置

（1）修改添加依賴

<properties>
        <java.version>1.8</java.version>
        <nacos.version>2.1.1.RELEASE</nacos.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>${nacos.version}</version>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

（2）修改配置 application.properties

server.port=8015
spring.application.name=service-comsumer

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

spring.cloud.nacos.discovery.enabled=true
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
spring.cloud.nacos.discovery.service=${spring.application.name}

spring.cloud.nacos.config.server-addr=127.0.0.1:8848
spring.cloud.nacos.config.file-extension=properties

（3）測試方法

添加注解@RefreshScope，開啟配置的動態更新

package com.xyz.comsumer.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RefreshScope
@RestController
public class HelloController {

    @Value("${hello-string}")
    private String helloString;
    
    @RequestMapping("/configTest")
    public String configTest() {
        return helloString;
    }
}

登錄http://localhost:8848/nacos

添加配置service-comsumer.properties

hello-string=customer

重新啟動customer

http://localhost:8015/configTest

輸出

　　customer

修改配置發布后，再次請求，會輸出新設定的值

注：

　　使用nacos服務配置，如果resource下，帶有bootstrap.properties，且配置寫入application.properties，這時會報錯

***************************
APPLICATION FAILED TO START
***************************

Description:

Application failed to connect to Nacos server: ""

Action:

Please check your Nacos server config

　　解決方法：將bootstrap.properties刪掉，或將配置寫入bootstrap.properties

 　  原因：可以查看下他們的區別  查看