Nacos Java开发--注册发现

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本文介绍了如何在Java Spring Boot项目中使用Nacos进行服务的注册与发现。首先，根据Spring Boot的版本选择合适的Nacos依赖，并在配置文件中设置Nacos集群的连接信息和应用名称。接着，通过在启动类添加注解实现服务注册，并创建服务接口进行服务调用。最后，启动服务并在Nacos管理界面查看注册的服务。

依赖环境准备

与Spring Boot版本对应关系如下

1.5.x for Spring Boot 1.5.x
2.0.x for Spring Boot 2.0.x
2.1.x for Spring Boot 2.1.x
2.2.x for Spring Boot 2.2.x

搭建好集群环境后，创建Spring Boot项目，增加如下依赖

<properties>
	<spring.cloud-version>Hoxton.SR10</spring.cloud-version>
        <spring.cloud.alibaba.version>2.2.5.RELEASE</spring.cloud.alibaba.version>
	<spring.openfeign-version>2.2.7.RELEASE</spring.openfeign-version>
</properties>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>${spring.cloud-version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>${spring.cloud.alibaba.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
	<dependency>
    	<groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>

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

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-openfeign-core</artifactId>
        <version>${spring.openfeign-version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
</dependencies>

其中spring-cloud-starter-alibaba-nacos-discovery是nacos注册发现的核心包，spring-cloud-openfeign-core和spring-cloud-starter-openfeign是用于获取zookeeper注册中心中的服务内容的核心包

在项目配置文件application.yml或boostrap.yml中增加如下配置

spring:
  application:
    name: centerm-framework-cloud
  cloud:
    nacos:
      discovery:
        username: xxxx
        password: xxxxxxxx
        server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850

其中spring.application.name是项目名称，同时也是注册中心的注册服务名，spring.cloud.nacos.discovery.server-addr配置单机或集群所有[IP:PORT]，spring.cloud.nacos.discovery.username/password是搭建集群环境时创建的用户名和密码

代码Demo

在启动类上加上@EnableDiscoveryClient使接口会被扫描注册到nacos，加上@EnableFeignClients使项目可以获取nacos中注册的服务

创建注册服务类

@RestController
@RequestMapping("/centermdemo")
public class CentermDemoController {
	@GetMapping("/get")
	public String get() {
		return "My First Spring Cloud Nacos!";
	}
}

创建发现服务接口

@FeignClient(value = "centerm-framework-cloud", path="/centermdemo")
public interface CentermDemoFeignService {
    @GetMapping("/get")
    String get();
}

其中value = "centerm-framework-cloud"就是配置文件中spring.application.name的属性值，path="/centermdemo"对应CentermDemoController 中的@RequestMapping("/centermdemo")

创建验证服务接口

@RestController
@RequestMapping("/centermdemofeign")
public class CentermDemoFeignController {
    @Autowired
    private CentermDemoFeignService centermDemoFeignService;

    @GetMapping("/get")
    public JsonResponse<CentermDemo> get(@RequestBody CentermDemo entity) {
        return centermDemoFeignService.get(entity);
    }
}