Nacos初接触以及应用示例

【推荐阅读】微服务还能火多久？>>>

背景

nacos是阿里开源的一款服务注册和配置管理的中间件

在SpringCloud中注册中心和配置中心一直是分开的，之前用了很长时间的eureka，但是eureka有时会莫名其妙的挂掉，就算是集群部署线上总是提心吊胆，这

Nacos的特色

下面是官网给出说法：

• Nacos 致力于帮助您发现、配置和管理微服务。Nacos 提供了一组简单易用的特性集，帮助您快速实现动态服务发现、服务配置、服务元数据及流量管理。

• Nacos 帮助您更敏捷和容易地构建、交付和管理微服务平台。 Nacos 是构建以“服务”为中心的现代应用架构 (例如微服务范式、云原生范式) 的服务基础设施。

应用案例

目录结构如下所示

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <groupId>com.zew.research</groupId>
    <artifactId>dubbo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <modules>
        <module>dubbo-consumer</module>
        <module>dubbo-provider</module>
        <module>dubbo-api</module>
    </modules>

    <dependencies>
        <!-- Dubbo dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.7</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.48.Final</version>
        </dependency>
        <!-- 使用Spring装配方式时可选: -->
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.6</version>
        </dependency>

    </dependencies>

</project>

作为配置管理使用

代码结构

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.zew.research</groupId>
        <artifactId>nacos-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.zew.research</groupId>
    <artifactId>config</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    
</project>

Ctrl.java

package com.zew.research.nacos.config;

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

@RefreshScope
@RestController
public class Ctrl {
    @Value("${demo.content:123}")
    public String content;
    @Value("${common.value:123}")
    public String commonValue;
    @GetMapping("/hello")
    public ResponseEntity<String> getHello() {
        return ResponseEntity.ok(commonValue+content);
    }
}

启动类

package com.zew.research.nacos.config;

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

@EnableDiscoveryClient
@SpringBootApplication
public class NacosConfigApplication {

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

}

配置

spring:
  application:
    name: zew-nacos-config
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: ${spring.cloud.nacos.discovery.server-addr}
        shared-configs: common.yml,common2.yml
#        namespace: iss
#        group: DEFAULT_GROUP
server:
  port: 8082

作为注册中心与Figen结合

结构

provider模块

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.zew.research</groupId>
        <artifactId>nacos-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.zew.research</groupId>
    <artifactId>fegin</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <packaging>pom</packaging>
    <modules>
        <module>provider</module>
        <module>consumer</module>
    </modules>
</project>

provider-client

pom xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.zew.research</groupId>
        <artifactId>fegin</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.zew.research</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.zew.research</groupId>
            <artifactId>provider-client</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <build>
        
    </build>
</project>

ProviderClient.java

package com.zew.research.nacos.fegin.provider.client;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(name = "zew-nacos-fegin-provider")
@Component
public interface ProviderClient {
    @GetMapping("hello")
    String sayHello();
}

provider-server

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.zew.research</groupId>
        <artifactId>provider</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.zew.research</groupId>
    <artifactId>provider-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    
</project>

启动类

package com.zew.research.nacos.feion.provider.server;

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

@EnableDiscoveryClient
@SpringBootApplication
public class NacosProviderServerApplication {

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

}

Controller

package com.zew.research.nacos.feion.provider.server;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Ctrl {
    @GetMapping("/hello")
    public ResponseEntity<String> sayHello(){
        return ResponseEntity.ok("i am provider");
    }
}

配置文件

spring:
  application:
    name: zew-nacos-fegin-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: ${spring.cloud.nacos.discovery.server-addr}

consummer模块

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>com.zew.research</groupId>
        <artifactId>fegin</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.zew.research</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.zew.research</groupId>
            <artifactId>provider-client</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
    <build>
        
    </build>
</project>

启动类

package com.zew.research.nacos.fegin.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableFeignClients(basePackages = "com.zew.research.nacos.fegin.provider.client")
@EnableDiscoveryClient
@SpringBootApplication
public class NacosConsumerApplication {

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

}

控制层

package com.zew.research.nacos.fegin.consumer;

import com.zew.research.nacos.fegin.provider.client.ProviderClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class Ctrl {
    @Autowired
    private ProviderClient providerClient;

    @GetMapping
    public ResponseEntity<String> sayHello() {
        return ResponseEntity.ok("i am consumer,provider says: " + providerClient.sayHello());
    }
}

配置文件

spring:
  application:
    name: zew-nacos-fegin-consummer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: ${spring.cloud.nacos.discovery.server-addr}
server:
  port: 8083

作为dubbo的注册中心

这个比较别扭，不太建议使用

结构

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <groupId>com.zew.research</groupId>
    <artifactId>dubbo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>
    <modules>
        <module>dubbo-consumer</module>
        <module>dubbo-provider</module>
        <module>dubbo-api</module>
    </modules>

    <dependencies>
        <!-- Dubbo dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.7</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.48.Final</version>
        </dependency>
        <!-- 使用Spring装配方式时可选: -->
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.6</version>
        </dependency>

    </dependencies>

</project>

dubbo-api

DemoServer.java

package com.zew.nacos.dubbo.service;
public interface DemoService {
    String sayName(String name);
}

dubbo-consummer

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <artifactId>dubbo-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <properties>
        <spring-boot.version>2.0.3.RELEASE</spring-boot.version>
        <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version>
        <netty-all.version>4.0.35.Final</netty-all.version>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <dependencies>

        <dependency>
            <groupId>com.zew.research</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${netty-all.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

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

        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-actuator</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>

        <!-- Dubbo Nacos registry dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
            <version>0.0.1</version>
        </dependency>

        <!-- Dubbo dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.5</version>
        </dependency>

        <!-- Alibaba Spring Context extension -->
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.1.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba</groupId>
                    <artifactId>dubbo</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>
</project>

TestNacosConsumer.java

package com.zew.nacos.dubbo.demo.consumer.ctrl;


import com.alibaba.dubbo.config.annotation.Reference;
import com.zew.nacos.dubbo.service.DemoService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author yanming
 * @version 1.0.0
 * @description
 * @date 2019/02/21 9:46
 **/
@Controller
@RequestMapping("consumer")
public class TestNacosConsumer {

    @Reference(group = "test-nacos2")
    DemoService demoService;

    @RequestMapping(value = "test", method = RequestMethod.GET)
    @ResponseBody
    public String getCounsumerTest() {
        return demoService.sayName("consumer");
    }
}

启动类

package com.zew.nacos.dubbo.demo.consumer;

import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@NacosPropertySource(dataId = "example", autoRefreshed = true)
public class NacosDubboConsumerApplication {

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

配置文件

nacos.config.server-addr=127.0.0.1:8848
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

##dubbo config
spring.application.name=spring-boot-nacos-consumer
dubbo.registry.address=nacos://127.0.0.1:8848
dubbo.application.name=spring-boot-nacos-consumer
dubbo.protocol.name=dubbo
dubbo.protocol.port=-1

server.port=8086

dubbo-provider

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>


    <groupId>com.zew.research</groupId>
    <artifactId>dubbo-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <properties>
        <spring-boot.version>2.0.3.RELEASE</spring-boot.version>
        <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version>
        <netty-all.version>4.0.35.Final</netty-all.version>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <dependencies>

        <dependency>
            <groupId>com.zew.research</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${netty-all.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

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

        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-actuator</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>

        <!-- Dubbo Nacos registry dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
            <version>0.0.1</version>
        </dependency>

        <!-- Dubbo dependency -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.5</version>
        </dependency>

        <!-- Alibaba Spring Context extension -->
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>0.2.1.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>com.alibaba</groupId>
                    <artifactId>dubbo</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

    </dependencies>

</project>

package com.zew.nacos.dubbo.provider.impl;

import com.alibaba.dubbo.config.annotation.Service;
import com.alibaba.dubbo.rpc.RpcContext;
import com.zew.nacos.dubbo.service.DemoService;
import org.springframework.beans.factory.annotation.Value;

/**
 * Default {@link DemoService}
 *
 * @since 2.6.5
 */
@Service(group = "test-nacos2", retries = 0, timeout = 10000)
public class DefaultService implements DemoService {
//    @Value("${hello}")
//    private String str;
    public String sayName(String name) {
        RpcContext rpcContext = RpcContext.getContext();
        return String.format("Service [name :%s , port : %d] %s(\"%s\") : Hello,%s",
                "hello",
                rpcContext.getLocalPort(),
                rpcContext.getMethodName(),
                name,
                name);
    }
}

package com.zew.nacos.dubbo.provider;

import com.alibaba.nacos.spring.context.annotation.config.NacosPropertySource;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@NacosPropertySource(dataId = "example", autoRefreshed = true)
public class NacosDubboProviderApplication {

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

配置文件
···
nacos.config.server-addr=127.0.0.1:8848
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

##dubbo config
spring.application.name=test
dubbo.registry.address=nacos://127.0.0.1:8848
dubbo.application.name=spring-boot-nacos-provider
dubbo.scan.basePackages=com.zew.nacos.dubbo.provider.impl
dubbo.protocol.name=dubbo
dubbo.protocol.port=-1

server.port=8085
···

个人感受

• 注册中心与配置中心结合很有想法
• 将最有难度的数据持久化交给mysql感觉有点取巧
• 单独一个nacos就能实现配置自动更新比较方便，相比之前需要多个Spring Config+Spring Bus中间件才能实现同样功能
• 跟dubbo整合更为方便

参考

参考了不少的网上资料，这里就不一一列出来了

来源：oschina

链接：https://my.oschina.net/u/4359458/blog/3234676