微服务springcloud2系列篇-配置与注册nacos组件

1. 下载与启动

地址: https://nacos.io/zh-cn/docs/quick-start.html
这里下载的是 nacos-server-1.4.1.tar.gz
上传到服务器 cd /data1/nacos/
解压 tar -xzvf nacos-server-1.4.1.tar.gz
cd nacos/bin
启动单机模式 sh startup.sh -m standalone
查看ps -ef | grep nacos

打开服务器8848端口
浏览器访问
http://服务器IP:8848/nacos/index.html

2. 注册功能

(1) 增加nacos-provider模块

修改pom.xml
增加

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

修改application.yml文件

spring:
  application:
    name: nacos-provider
  cloud:
    nacos:
      discovery:
        server-addr: 地址:8848 #nacos地址:端口
        namespace: 空间 # 空间
        cluster-name: 集群 # 集群
        group: 分组 #分组
server:
  port: 9000

启动类增加@EnableDiscoveryClient注解

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProviderApplication {
    public static void main(String[] args) {
        SpringApplication.run(NacosProviderApplication.class, args);
    }
}

增加rest接口

@RestController
public class NacosProviderController {

    @GetMapping(value = "/get")
    public String get(@RequestParam String string) {
        return "Hello Nacos Discovery " + string;
    }

    @GetMapping(value = "/path/{string}")
    public String path(@PathVariable String string) {
        return "Hello Nacos Discovery " + string;
    }

}

(2) 增加nacos-consumer模块

修改pom文件

    <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>

修改yml文件

spring:
  application:
    name: nacos-consumer
  cloud:
    nacos:
      discovery:
        server-addr: 地址:8848 #注册地址
        namespace: 空间
        cluster-name: 集群
        group: 分组

server:
  port: 9001

feign:
  hystrix:
    enabled: true #设置熔断调用

启动类

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {

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

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

增加feign调用

@FeignClient(value = "nacos-provider", fallback = NacosClientFallback.class)
public interface NacosClient {

    @GetMapping(value = "/path/{string}")
    String path(@PathVariable String string);

    @GetMapping(value = "/get")
    String get(@RequestParam String string);
}

@Component
@EnableFeignClients
public class NacosClientFallback implements NacosClient {

    @Override
    public String path(String string) {
        return "服务 Nacos Discovery 异常 参数=" + string;
    }

    @Override
    public String get(String string) {
        return "服务 Nacos Discovery 异常 参数=" + string;
    }
}

增加rest接口

@RestController
public class NacosConsumerController {

    private final RestTemplate restTemplate;

    @Autowired
    private NacosClient nacosClient;

    @Autowired
    public NacosConsumerController(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
    public String echo(@PathVariable String str) {
        return restTemplate.getForObject("http://nacos-provider/path/" + str, String.class);
    }

    @RequestMapping(value = "/echo1/{str}", method = RequestMethod.GET)
    public String echo1(@PathVariable String str) {
        return nacosClient.path(str);
    }

    @RequestMapping(value = "/echo2/{str}", method = RequestMethod.GET)
    public String echo2(@PathVariable String str) {
        return nacosClient.get(str);
    }

}

启动nacos-provider nacos-consumer
浏览器打开nacos地址

验证
http://localhost:9001/echo/测试
http://localhost:9001/echo1/测试1
http://localhost:9001/echo2/测试2

3. 配置功能

增加nacos-config模块
修改pom文件

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

增加bootstrap.yml

spring:
  application:
    name: nacos-config
  cloud:
    nacos:
      config:
        server-addr: nacos地址
        namespace: 空间
        file-extension: yaml  #文件格式
        cluster-name: 集群
        group: 分组

server:
  port: 9002

增加rest接口

@RestController
@RequestMapping("/config")
@RefreshScope
public class NacosConfigController {

    @Value("${server.name:name123}")
    private String name;

    @Value("${port1:123}")
    private Long port1;

    @Value("${port:456}")
    private Integer port2;

    @GetMapping(value = "/param")
    public String param() {
        return "name=" + name + "  port1=" + port1 + "  port2=" + port2;
    }

}

启动nacos-config

打开浏览器

验证
http://localhost:9002/config/param
地址