Nacos is used as a registration center

I learned about Nacos And installed nacos-server service . Next, simply build a microservice project , Use Nacos Be a registry .

One 、 Project structures,

Project version selection ：

Spring Cloud Alibaba Version selection ：https://github.com/alibaba/spring-cloud-alibaba/wiki/%E7%89%88%E6%9C%AC%E8%AF%B4%E6%98%8E

Choose here ：

1、 Create parent module

stay pom.xml Medium management version .

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>14</maven.compiler.source>
    <maven.compiler.target>14</maven.compiler.target>
    <spring-cloud.version>Hoxton.SR12</spring-cloud.version>
    <spring-cloud-alibaba.version>2.2.8.RELEASE</spring-cloud-alibaba.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>
    <dependencies>
      <!-- spring-cloud -->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>${spring-cloud.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!-- spring-cloud-alibaba-dependencies -->
      <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-alibaba-dependencies</artifactId>
        <version>${spring-cloud-alibaba.version}</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>

    </dependencies>
  </dependencyManagement>

2、 establish order service

Configure service provider order service , Service providers can use Nacos The service registration discovery function of registers its services to the Nacos server On .

2.1 Introduce dependencies

The current project pom Introduction in nacos rely on

        <!-- nacos Service registration and discovery  -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

2.2 The configuration file

To configure nacos Registry Center

server:
  port: 18082
  servlet:
    context-path: /

spring:
  application:
    name: app-order  # Microservice name 

  # To configure nacos Address of Registration Center 
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.xxx.xxx:8848
        #namespace: f16bcf35-810d-4b5b-a936-bd2abb8582a3
        #cluster-name: SH

More configuration ：https://github.com/alibaba/spring-cloud-alibaba/wiki/Nacos-discovery

3、 establish user service

Configure service consumers user service , Service consumers can go through Nacos The service registration discovery function of Nacos server Get the service it wants to call .

3.1 Introduce dependencies

The current project pom Introduce dependency in

        <!-- nacos Service registration and discovery  -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

3.2 The configuration file

To configure nacos Registry Center

server:
  port: 18081
  servlet:
    context-path: /app-user

spring:
  application:
    name: app-user  # Microservice name 

  # To configure nacos Address of Registration Center 
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.xxx.xxx:8848
        #namespace: f16bcf35-810d-4b5b-a936-bd2abb8582a3
        #cluster-name: SH

3.3 Use RestTemplate Make service calls

1） Turn on @LoadBalanced And Ribbon Integration of .

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
    
        return new RestTemplate();
    }

2） Use RestTemplate Make service calls

Write a controller call .

 	@RequestMapping(value = "/findOrderByUserId/{id}")
    public R findOrderByUserId(@PathVariable("id") Integer id) {
    
        log.info(" according to userId:" + id + " Query order information ");
        
        String url = "http://app-order/order/findOrderByUserId/" + id;
        R result = restTemplate.getForObject(url, R.class);
        return result;
    }

4、 start-up user and order service

stay nacos Check whether the registration is successful in the management interface .

stay nacos The management end , You can also specify some configurations , such as , The weight , grouping , Cluster etc. .

5、 Test access user service

Browser access test controller, Test service invocation ok.

Here we are ,Nacos Just use it as a registration center OK 了 .Namespace and Group There are many usage scenarios for configuration items , Know for yourself .

– Stay Hungry , stay foolish .