nacos作為注冊中心的簡單項目配置

注冊中心(nacos)

github地址

接入方式-中文版

一、版本管理

• Spring Boot 2.2.5.RELEASE
• Spring Cloud Hoxton.SR3
• Spring Cloud Alibaba 2.2.1.RELEASE

二、依賴引入

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <java.version>1.8</java.version>
    <spring-cloud.version>Hoxton.SR3</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2.2.1.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <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>

三、接入項目

1、注冊中心依賴

 <dependency>
     <groupId>com.alibaba.cloud</groupId>
     <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
 </dependency>

2、bootstrap.properties

spring.cloud.nacos.server-addr=127.0.0.1:8848
spring.application.name=test-demo

有時新建的properties文件會圖標異常，配置沒有提示。

IntelliJ IDEA按一下步驟操作：

• File ==> Project Settings ==> Modules ==> Spring
• 點擊右側上方的綠色圖標(Spring的icon)
• 點擊“+”號
• 選擇文件后，一路“OK”即可。

參考連接

3、application.yml

spring:
  cloud:
    nacos:
      config:
        server-addr: 127.0.0.1:8848 # nacos-server 地址
  application:
    # 項目名稱
    name: test-demo # 項目名稱

4、啟動類配置

@SpringBootApplication
//  @EnableDiscoveryClient注解開啟服務注冊與發現功能
@EnableDiscoveryClient
public class ProviderApplication {

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

四、OpenFeign

1、引入open-feign

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

2、啟動類

@SpringBootApplication
// Feign掃描的包路徑
@EnableFeignClients(basePackages = "xxx.xxx.xxx")
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

3、service

// test-demo為想要調用接口在注冊中心中的名稱
@FeignClient("test-demo")
public interface DemoService {
    // 此處路徑要寫全。比如調用接口的請求路徑為/demo/show，此處也為/demo/show
	@RequestMapping("/demo/show")
	public String show();
}

4、controller

@Controller
public class DemoController {
    
    // 正常注入即可
	@Autowired
	DemoService demoService;
		
	@RequestMapping("/hello")
	public String helloName() {
		return demoService.show();
	}
}