四、Nacos服务注册

1.Nacos简介

1.2.为什么叫Nacos？

前四个字母分别为Naming和Configuration的前两个字母，最后的s为Service

1.3.是什么?

  • 一个更易于构建云原生应用的动态服务发现，配置管理和服务管理中心
  • Nacos：Dynamic Naming and Configuration Service
  • Nacos就是注册中心+配置中心的组合（等价于：Nacos = Eureka+Config+Bus）

1.4.能干嘛？

  • 替代Eureka做服务注册中心
  • 替代Config做服务配置中心

1.5.去哪下?

官方下载
官网文档

1.6.各种注册中心比较

2.安装并运行Nacos

  • 本地Java8+Maven环境已经OK
  • 先从官网下载Nacos
  • 解压安装包，直接运行bin目录下的startup.cmd
  • 命令运行成功后直接访问http: //localhost:8848/nacos(默认账号密码都是nacos)
  • 运行结果页面如下

3.Nacos作为服务注册中心演示

3.1.搭建工程

3.1.1.父工程spingcloud20

（1）pom.xml文件
<?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.xiaoliu</groupId>
    <artifactId>spingcloud20</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <!--统一管理jar包和版本-->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.18.10</lombok.version>
        <mysql.version>5.1.47</mysql.version>
        <druid.verison>1.1.16</druid.verison>
        <mybatis.plus.boot.verison>3.2.0</mybatis.plus.boot.verison>
    </properties>


    <!--子模块继承之后，提供作用：锁定版本+子model不用写groupId和version-->
    <dependencyManagement>
        <dependencies>
            <!--spring boot 2.2.0-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.2.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud Hoxton.SR1-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba 2.2.1.RELEASE-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.2.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- MySql -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            <!-- Druid -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid-spring-boot-starter</artifactId>
                <version>${druid.verison}</version>
            </dependency>
            <!-- mybatis-plus-springboot整合 -->
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>${mybatis.plus.boot.verison}</version>
            </dependency>
            <!--lombok-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
            <!--junit-->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>${junit.version}</version>
            </dependency>
            <!-- log4j -->
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3.1.2.公共子模块cloud-api-commons

（1）pom.xml文件
<?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">
    <parent>
        <artifactId>spingcloud20</artifactId>
        <groupId>com.xiaoliu</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-api-commons</artifactId>

    <dependencies>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>
（2）统一返回结果R.java
package com.xiaoliu.entity;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import java.util.HashMap;
import java.util.Map;

/**
 * 统一返回结果类
 * @Author LL
 * @Date 2020-04-07 10:27
 */
@Data
public class R{

    private Boolean success;//是否成功
    private Integer code;//返回码
    private String message;//返回信息
    private Map<String,Object> data = new HashMap<>();//返回数据

    /**
     * 构造方法私有化
     */
    private R(){}

    /**
     * 成功的静态方法
     * @return R
     */
    public static R ok(){
        R r = new R();
        r.setSuccess(true);
        r.setCode(200);
        r.setMessage("成功");
        return r;
    }

    /**
     * 失败的静态方法
     * @return R
     */
    public static R error(){
        R r = new R();
        r.setSuccess(false);
        r.setCode(999);
        r.setMessage("失败");
        return r;
    }
    public R success(Boolean success){
        this.setSuccess(success);
        return this;
    }
    public R message(String message){
        this.setMessage(message);
        return this;
    }
    public R code(Integer code){
        this.setCode(code);
        return this;
    }
    public R data(Map<String, Object> map){
        this.setData(map);
        return this;
    }
    public R data(String key,Object value){
        this.data.put(key,value);
        return this;
    }
}
（3）公共实体类Payment.java
package com.xiaoliu.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
import java.io.Serializable;

/**
 *
 * @Author LL
 * @Date 2020-04-07 10:22
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
public class Payment implements Serializable {

    private Long id;
    private String serial;
}

3.2.基于Nacos的服务提供者 cloudalibaba-provider-payment9001

（1）pom.xml文件
 <dependencies>
        <!-- nacos-discovery -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.62</version>
        </dependency>
    </dependencies>
（2）application.yml文件
server:
  port: 9001

spring:
  application:
    name: nacos-payment-provider
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.10.33:8848 #配置Nacos地址

management:
  endpoints:
    web:
      exposure:
        include: '*'
（3）PaymentMain9001.java
package com.xiaoliu;

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

/**
 * @Author LL
 * @Date 2020-07-07 13:22
 */
@EnableDiscoveryClient
@SpringBootApplication
public class PaymentMain9001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain9001.class, args);
    }
}
（4）PaymentController.java
package com.xiaoliu.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;

/**
 * @Author LL
 * @Date 2020-07-07 13:23
 */
@RestController
public class PaymentController {

    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/payment/nacos/{id}")
    public String getPayment(@PathVariable("id") Integer id)
    {
        return "nacos registry, serverPort: "+ serverPort+"\t id="+id;
    }
}

3.3.基于Nacos的服务提供者 cloudalibaba-provider-payment9002

仿cloudalibaba-provider-payment9001创建，其中端口号为9002

3.4.基于Nacos的服务消费者 cloudalibaba-consumer-nacos-order83

（1）pom.xml

 <dependencies>
        <!--SpringCloud ailibaba nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.xiaoliu</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

（2）application.yml

server:
  port: 83

spring:
  application:
    name: nacos-order-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.10.33:8848

（3）OrderNacosMain83.java

package com.xiaoliu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

/**
 * @Author LL
 * @Date 2020-07-07 14:11
 */
@EnableDiscoveryClient
@SpringBootApplication
public class OrderNacosMain83 {
    public static void main(String[] args) {
        SpringApplication.run(OrderNacosMain83.class, args);
    }

    @Bean
    @LoadBalanced//负载均衡
    public RestTemplate getRestTemplate()
    {
        return new RestTemplate();
    }
}

（4）OrderNacosController.java

package com.xiaoliu.controller;

import com.xiaoliu.service.PaymentFeignService;
import org.springframework.beans.factory.annotation.Autowired;
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;

/**
 * @Author LL
 * @Date 2020-07-07 14:27
 */
@RestController
public class OrderNacosController {

    @Autowired
    private RestTemplate restTemplate;

    //ribbon负载均衡使用
    @GetMapping(value = "/consumer/payment/nacos/{id}")
    public String paymentInfo(@PathVariable("id") Integer id)
    {
        String url = "http://nacos-payment-provider/payment/nacos/"+id;
        return  "使用ribbon："+restTemplate.getForObject(url, String.class);
    }
}

说明：Nacos中自带负载均衡Ribbon，为什么Nacos支持负载均衡？

3.5.测试

启动项目，nacos控制台显示如下

http:// localhost:83/consumer/payment/nacos/13 ，83访问9001/9002，轮询负载OK

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