Nacos installation configuration and single-machine deployment tutorial

首先说明：This tutorial is for thatnacos版本：1.3.2,不同的版本,可能略有不同.

Springcloudalibaba的版本与Springboot的版本与nacos版本需要对应

Nacos支持三种部署模式

• 单机模式 - 用于测试和单机试用.
• 集群模式 - 用于生产环境,确保高可用.
• 多集群模式 - 用于多数据中心场景.

单机部署：

1、首先去官网下载nacos

Releases · alibaba/nacos · GitHub

The default is to start the cluster,Can be modified to stand-alone startup mode：

Windows启动脚本命令：

startup.cmd -sstandalone

nacos初体验

父maven的版本依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <modules>
        <module>order-nacos</module>
        <module>stock-nacos</module>
    </modules>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example.springcloudalibaba</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloudalibabaDemo</name>
    <description>Demo project for Spring springcloudalibaba</description>

    <properties>
        <java.version>1.8</java.version>
        <spring.cloud.alibaba.version>2.2.5.RELEASE</spring.cloud.alibaba.version>
        <sping.boot.version>2.3.2.RELEASE</sping.boot.version>
        <spring.cloud.version>Hoxton.SR8</spring.cloud.version>
    </properties>

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

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

    <dependencyManagement>
        <!--springcloudalibaba的版本管理,通过dependency继承-->
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springboot的版本管理器-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>${sping.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springcloud的版本管理器-->
            <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>
    <!--打包的插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Imported in every submodulenacos依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--nacos 服务注册发现-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

configured in each submodulenacos,端口不同

server:
  port: 8021
#nacos配置
# 应用名称,nacos会将该名称当做服务名称
spring:
  application:
    name: stock-service
  cloud:
    nacos:
      server-addr: 127.0.0.1:8848
      discovery:
        username: nacos
        password: nacos #登录nacosUsername and password for the visual interface
        namespace: public #命名空间

配置好nacosThe service will then be automatically registered

nacosThe service calls depend on the load balancer,默认是ribbon.在消费者端配置restTemplateThe service interface used to call the provider side

package per;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

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

    @Bean
    @LoadBalanced // 负载均衡器注解,nacosThe service calls rely on load balancing（nacosFailed to translate service name to service address,需要使用负载均衡器,The polling method is used by default）
    public RestTemplate restTemplate(RestTemplateBuilder builder){
        RestTemplate RestTemplate = builder.build();
        return RestTemplate;

    }
}

编写服务提供者

package per.pz.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("stock")
public class stockController {
    //读取配置文件中的端口
    @Value("${server.port}")
    String port;
    @RequestMapping("/reduct")
    public String reduct(){
        System.out.println("扣减库存");
        return "扣减库存111"+port;
    }
}

编写服务消费者

package per.pz.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("order")
public class oderController {
    @Autowired
    RestTemplate RestTemplate;

    @RequestMapping("/add")
    public String add(){
        System.out.println("下单成功");
//       服务间的通讯,There is no way to use microservices
//        The disadvantage of the method is that the service address is hard-coded in the code,So use the registry to solve it
//        String msg = RestTemplate.getForObject("http://localhost:8021/stock/reduct",String.class);
//        nacos服务调用,No need to use an address,使用服务名称即可
        String msg = RestTemplate.getForObject("http://stock-service/stock/reduct",String.class);
        return "下单成功111"+msg;
    }
}

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