SpringCloudAlibaba篇（一）之环境搭建以及nacos实现服务注册与发现 ---＞ 领你快速入门

1、创建一个Maven项目，引入关键依赖

<?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>stock-nacos</module>
        <module>order-nacos</module>
    </modules>
    <packaging>pom</packaging>
    <groupId>com.lili</groupId>
    <artifactId>springcloud-alibaba</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-alibaba</name>
    <description>springcloud-alibaba</description>
    <properties>
        <java.version>1.8</java.version>
        <spring.cloud.alibaba>2.2.6.RELEASE</spring.cloud.alibaba>
        <spring.boot.starter>2.3.2.RELEASE</spring.boot.starter>
        <spring.cloud.dependency>Hoxton.SR9</spring.cloud.dependency>
    </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>
        </dependency>
    </dependencies>
    <!--SpringCloudAlibaba的版本管理-->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring.cloud.alibaba}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springboot版本管理-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-parent</artifactId>
                <version>${spring.boot.starter}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--SpringCloud的版本管理-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.dependency}</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、order-nacos服务创建

2.1、pom文件所需依赖

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

2.2、yml文件

server:
  port: 9001
# 服务名称
spring:
  application:
    name: order-server
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        username: nacos
        password: nacos
        namespace: public

2.3、编写一个简单的controller等后续调用

@RestController
@RequestMapping("/order")
public class OrderController {

    @Autowired
    RestTemplate restTemplate;

    @GetMapping("/orderList")
    public String getOrder() {
        System.out.println("订单");
        String message = restTemplate.getForObject("http://stock-server/stock/stockList", String.class);
        return "order" + message;
    }
}

2.4、启动类加上以下内容

@Bean
@LoadBalanced
public RestTemplate getRestTemplate(RestTemplateBuilder builder){
    return builder.build();
}

3、stock-nacos服务创建

3.1、pom文件所需依赖

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

3.2、yml文件

server:
  port: 9002
# 服务名称
spring:
  application:
    name: stock-server
  cloud:
    nacos:
      discovery:
        namespace: public
        username: nacos
        password: nacos
        server-addr: 127.0.0.1:8848

3.3、编写一个controller等后续服务调用

@RestController
@RequestMapping("/stock")
public class StockController {
    @Value("${server.port}")
    String value;
    @RequestMapping("/stockList")
    public String getStock(){
        System.out.println("库存");
        return "扣减库存"+value;
    }
}

4、下载nacos

下载地址：https://github.com/alibaba/nacos/releases?q=1.4.2&expanded=true

下载完成后，右击文本打开下列文件，

由于默认nacos是集群模式，我们需要修改为单机模式

如上图，将默认得cluster修改为standalone即可、保存退出

5、启动nacos

启动方式：双击startup.cmd即可，如下图所示。

访问后默认的账号和密码都是nacos，登陆即可

6、启动order-nacos和stock-nacos

正常启动：

观察nacos客户端的情况：

发现成功注册进来了

7、服务发现

访问写好的接口即可

成功访问到stock-nacos服务里面的内容。