SpringCloud怎么使用Nacos做注册中心+配置中心？

Nacos是阿里生态下, 用于微服务注册与发现、配置管理实时刷新的微服务平台. 默认使用嵌入式持久化, 可支持MySQL数据库持久化

安装Nacos服务

1.下载nacos服务 版本 1.3.2 Windows下下载zip包并解压

2.可使用默认方式持久化, 跳过此步骤. 如果使用mysql, 需要创建数据库nacos, 执行conf/nacos-mysql.sql, 并修改application.properties, 配置MySQL连接信息

### If use MySQL as datasource:
spring.datasource.platform=mysql

### Count of DB:
db.num=1

### Connect URL of DB:
db.url.0=jdbc:mysql://127.0.0.1:3306/nacos?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC
db.user=root
db.password=root

3.双击bin/startup.cmd, 启动nacos, 如果是单节点启动, 需要修改startup.cmd, 否则会报错

4.访问地址 ​​http://localhost:8848/nacos/index.html​​ username: nacos password: nacos

set MODE="standalone" // 默认为cluster
set FUNCTION_MODE="all"
set SERVER=nacos-server
set MODE_INDEX=-1
set FUNCTION_MODE_INDEX=-1
set SERVER_INDEX=-1
set EMBEDDED_STORAGE_INDEX=-1
set EMBEDDED_STORAGE=""

调整provider

1.调整pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <!-- 如果使用配置中心, 需要依赖此jar -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        <version>2.1.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        <version>2.1.1.RELEASE</version>
    </dependency>
</dependencies>

2.配置bootstrap.yml, 注意名称一定要是bootstrap

server:
  port: 8079

spring:
  application:
    name: provider

  cloud:
    nacos:
      config:
        enable: true
        server-addr: localhost:8848
      discovery:
        enabled: true
        server-addr: localhost:8848

3.设置Applicaiton

@SpringBootApplication
public class ProviderApplication {

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

}

4.添加controller

@RestController
public class IndexController {
    @GetMapping("/index")
    private String index() {
        return "success";
    }
}

调整consumer

1.调整pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

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

    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        <version>2.1.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        <version>2.1.1.RELEASE</version>
    </dependency>

</dependencies>

2.配置bootstrap.yml, 注意名称一定要是bootstrap

server:
  port: 8081

spring:
  application:
    name: consumer

  cloud:
    nacos:
      config:
        server-addr: localhost:8848
        file-extension: yaml  # 此处为配置使用的后缀名
      discovery:
        server-addr: localhost:8848

3.设置Applicaiton

@EnableFeignClients
@SpringBootApplication
public class ConsumerApplication {

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

4.添加FeginClient

@FeignClient(name = "provider")
public interface ProviderFeignClient {

    @GetMapping("/index")
    String index();

}

5.添加配置映射

@Component
@RefreshScope // 添加此注解表示会实时更新value 另外需要给属性添加get set方法
public class NacosConfig {
    @Value("${is_test:true}") // 此处true为默认值
    private boolean isTest;
    public boolean isTest() { return isTest; }
    public void setIsTest(boolean isTest) { this.isTest = isTest; }
}

6.添加controller, controller处不能添加@RefreshScope注解, 否则使用@Value获取不到配置信息

@RestController
public class IndexController {
    @Autowired
    private NacosConfig config;
    @Autowired
    private ProviderFeignClient providerFeignClient;
    @GetMapping("/index")
    private String index() {
        return config.isTest() + "--" + providerFeignClient.index();
    }
}

7.nacos管理后台添加配置信息 配置管理->配置列表->右侧"+", 注意Data ID格式

${prefix}-${spring.profiles.active}.${file-extension}

8.启动provider, consumer, 可在nacos管理平台查看服务状态

9.consumer启动关键日志, consumer已获取到配置信息

2020-10-25 09:47:22.928  WARN 4032 --- [           main] c.a.c.n.c.NacosPropertySourceBuilder     : Ignore the empty nacos configuration and get it based on dataId[consumer] & group[DEFAULT_GROUP]
2020-10-25 09:47:22.942  INFO 4032 --- [           main] c.a.c.n.c.NacosPropertySourceBuilder     : Loading nacos data, dataId: 'consumer.yaml', group: 'DEFAULT_GROUP', data: is_test: false
2020-10-25 09:47:22.949  INFO 4032 --- [           main] b.c.PropertySourceBootstrapConfiguration : Located property source: CompositePropertySource {name='NACOS', propertySources=[NacosPropertySource {name='consumer.yaml'}, NacosPropertySource {name='consumer'}]}
2020-10-25 09:47:22.954  INFO 4032 --- [           main] c.c.demo.consumer.ConsumerApplication    : No active profile set, falling back to default profiles: default

10.访问​​http://localhost:8081/index​​, 如果将配置删除, 找不到is_test, 会变为默认值true. 测试

11.在nacos管理平台修改配置is_test值, 可以看到consumer日志变化

2020-10-25 10:01:51.091  INFO 4032 --- [-localhost_8848] o.s.c.e.event.RefreshEventListener       : Refresh keys chan