以上引自nacos官方文档
使用Nacos作为应用的服务注册中心之前,需要下载的Nacos并启动Nacos Server。Nacos的安装使用,可以参考 Nacos 快速开始
这一点与Eureka的使用有所的区别。因为SpringCloud原生支持Eureka,Eureka Server 采用的是Peer to Peer(点对点) 对等通信,是一种去中心化的架构。所以Euraka只需通过@EnableEurekaServer注解,就能把一个服务实例启用为服务注册中心
sh startup.sh -m standalone
cmd startup.cmd -m standalone
-m standalone
和-m cluster
startup.sh
或startup.cmd
脚本位于Nacos解压后的bin目录下,启动之后访问http://127.0.0.1:8848/nacos/
,可看到Nacos的服务管理界面如下一旦nacos启动成功,意味着我们已经有了一个服务注册中心了,接下来我们将来分别创建服务提供者·alibaba-nacos-discovery-server
和服务消费者alibaba-nacos-discovery-client-common
,分别演示服务的注册与发现
目录结构如下:
pom.xml依赖配置如以下:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
<optional>true</optional>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>0.2.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
启动类增加@EnableDiscoveryClient
注解,开启Spring Cloud的服务注册与发现
@EnableDiscoveryClient
@SpringBootApplication
public class AlibabaNacosDiscoveryServerApplication {
public static void main(String[] args) {
SpringApplication.run(AlibabaNacosDiscoveryServerApplication.class, args);
}
}
提供接口服务TestController
:
@RestController
public class TestController {
private static Logger log = LoggerFactory.getLogger(TestController.class);
@GetMapping("/hello")
public String hello(@RequestParam String name) {
log.info("invoked name = " + name);
return "hello " + name;
}
}
新增配置:
# 应用名
spring.application.name=alibaba-nacos-discovery-server
# 端口
server.port=8001
# Nacos服务注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
启动:
INFO 25148 --- [ main] o.s.c.a.n.registry.NacosServiceRegistry : nacos registry, alibaba-nacos-discovery-server 192.168.10.211:8001 register finished
访问nacos管理页面:
目录结构如下:
pom.xml依赖配置如以下:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>0.2.2.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
</dependencies>
启动类增加@EnableDiscoveryClient
注解,开启Spring Cloud的服务注册与发现,添加@EnableFeignClients
注解,用于controller里多种调用方式演示
@EnableDiscoveryClient
@SpringBootApplication
public class AlibabaNacosDiscoveryServerApplication {
public static void main(String[] args) {
SpringApplication.run(AlibabaNacosDiscoveryServerApplication.class, args);
}
}
提供接口服务TestController
,提供多种服务调用方式,分别为Feign、RestTemplate、WebClient:
@RestController
public class TestController {
@Autowired
private LoadBalancerClient loadBalancerClient;
@Autowired
private RestTemplate restTemplate;
@Autowired
private WebClient.Builder webClientBuilder;
@Autowired
private TestFeignClient client;
/* original */
@GetMapping("/test")
public String test() {
// 通过spring cloud common中的负载均衡接口选取服务提供节点实现接口调用
ServiceInstance serviceInstance = loadBalancerClient.choose("alibaba-nacos-discovery-server");
String url = serviceInstance.getUri() + "/hello?name=" + "gaohb";
RestTemplate restTemplate = new RestTemplate();
String result = restTemplate.getForObject(url, String.class);
return "Invoke : " + url + ", return : " + result;
}
/* feign */
@GetMapping("/testFeign")
public String testFeign() {
String result = client.hello("gaohb");
return "Return : " + result;
}
/* RestTemplate */
@GetMapping("/testRestTemplate")
public String testRestTemplate() {
String result = restTemplate.getForObject("http://alibaba-nacos-discovery-server/hello?name=gaohb", String.class);
return "Return : " + result;
}
/* webClient */
@GetMapping("/testWebClient")
public Mono<String> testWebClient() {
Mono<String> result = webClientBuilder.build()
.get()
.uri("http://alibaba-nacos-discovery-server/hello?name=gaohb")
.retrieve()
.bodyToMono(String.class);
return result;
}
}
新增feign客户端TestFeignClient
,用于声明式调用服务演示:
@FeignClient("alibaba-nacos-discovery-server")
public interface TestFeignClient {
@GetMapping("/hello")
String hello(@RequestParam(name = "name") String name);
}
另外是RestTemplate
和 WebClient.Builder
注册到Spring容器,用于RestTemplate和WebClient.Builder两种服务调用方式演示
@Configuration
public class TestConfig {
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
return new RestTemplate();
}
@Bean
@LoadBalanced
public WebClient.Builder loadBalancedWebClientBuilder() {
return WebClient.builder();
}
}
新增配置:
# 应用名
spring.application.name=alibaba-nacos-discovery-client-common
# 端口
server.port=9000
# Nacos服务注册中心地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848
启动:
INFO 25148 --- [ main] o.s.c.a.n.registry.NacosServiceRegistry : nacos registry, alibaba-nacos-discovery-common 192.168.10.211:9000 register finished
访问nacos管理页面,服务也正常注册:
访问
http://localhost:9000/test
http://localhost:9000/testFeign
http://localhost:9000/testRestTemplate
http://localhost:9000/testWebClient
可以看到服务正常调用,结果分别如下:
Invoke : http://your_ip:8001/hello?name=AceLin_H, return : hello AceLin_H
Return : hello AceLin_H
Return : hello AceLin_H
hello AceLin_H
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如有侵权,请联系 cloudcommunity@tencent.com 删除。