Spring Cloud Alibaba（1）Spring Cloud搭建nacos最新版微服务体系快速入门带源码

1. 这是快速搭建spring cloud alibaba nacos0.9微服务体系的提供者-注册中心-消费者流程，开箱即用。

2. 项目介绍：使用技术有spring cloud alibaba nacos0.9+spring cloud feign+spring boot2.x。

源码地址：https://gitee.com/acelee723/acelee-SpringCloudAlibaba-nacosDemo

nacos0.8.0 服务注册中心

nacos-provider 服务提供者

nacos-consumer 服务消费者

3. 搭建nacos

什么是Nacos？参考官方文档https://nacos.io/zh-cn/docs/what-is-nacos.html

1)从官网https://github.com/alibaba/nacos/releases下载nacos-server-0.9.0.zip或者0.8.0.zip，我这里用的8。下载完毕后解压，打开bin目录下，双击startup.cmd启动，访问http://127.0.0.1:8848/nacos可以看到nacos登陆页面，默认账户名和密码都是nacos

4.搭建nacos-provider提供者

1）pom添加依赖，spring boot版本2.x，spring cloud版本Greenwich.RELEASE（最新版本查看https://spring.io/projects/spring-cloud）

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <artifactId>nacos-provider</artifactId>
    <name>nacos-provider</name>
    <description>Demo project for nacos-provider</description>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>0.2.1.RELEASE</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>

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

</project>

2）application.yml配置文件增加属性，server-addr对应的是nacos启动的地址和端口。

server:
  port: 8888
spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

3）启动类增加@EnableDiscoveryClient

package com.acelee.provider;

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

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderApplication {

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

}

4）增加controller包，下面新增HelloController类。

package com.acelee.provider.controller;

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

/**
 * @Auther: Ace Lee
 * @Date: 2019/3/14 14:14
 */
@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello(@RequestParam("name")String name){
        return "Hello "+name+", this is nacos-provider message.";
    }
}

5）启动nacos-provider，可以看到nacos服务列表多了一个服务

6）访问http://localhost:8888/hello?name=acelee返回：Hello acelee, this is nacos-provider message. 证明服务正常启动

5.搭建nacos-consumer消费者

1）pom添加依赖，spring boot版本2.1x，spring cloud版本Greenwich.RELEASE（用最新版本）

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <artifactId>nacos-consumer</artifactId>
    <name>nacos-consumer</name>
    <description>Demo project for nacos-consumer</description>

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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>0.2.1.RELEASE</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>

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

</project>

2）application.yml配置文件增加属性

server:
  port: 8889
spring:
  application:
    name: nacos-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

3）启动类增加@EnableDiscoveryClient和@EnableFeignClients

package com.acelee.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;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class NacosConsumerApplication {

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

}

4）新增service包，下面新增HelloService接口

@FeignClient("")里面的值对应nacos-provider服务提供者的spring.application.name属性的值；

hello方法的路径和参数必须和nacos-provider服务提供者保持一致；

package com.acelee.consumer.service;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

/**
 * @Auther: Ace Lee
 * @Date: 2019/3/14 14:03
 */
@FeignClient("nacos-provider")
public interface HelloService {

    @RequestMapping("/hello")
    String hello(@RequestParam("name")String name);
}

5）新增controller包，下面新增HelloController类，注入HelloService

package com.acelee.consumer.controller;

import com.acelee.consumer.service.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Auther: Ace Lee
 * @Date: 2019/3/14 14:05
 */
@RestController
public class HelloController {

    @Autowired
    private HelloService helloService;

    @RequestMapping("/hello/{name}")
    public String hello(@PathVariable String name){
        return helloService.hello(name);
    }

}

6）启动consumer消费者，可以看到nacos服务列表又多了一个服务

7)访问http://localhost:8889/hello/acelee返回：Hello acelee, this is nacos-provider message.证明消费者启动正常，且已经调用提供者服务成功。

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Spring Cloud Alibaba（1）Spring Cloud搭建nacos最新版微服务体系快速入门 带源码

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