Nacos Configuration Center

Previous article: Nacos Server cluster construction

Add configuration set

• Just create a new one in the nacos configuration center
  
  

Refresh configuration items in real time

• rely

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

• Modify the configuration file application.ymltobootstrap.yaml
• Add config configuration
  

server:
  port: 8083

spring:
  application:
    name: m-service-resume

  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8 &serverTimezone=UTC
    username: root
    password: root
  jpa:
    database: MySQL
    show-sql: true
    hibernate:
      naming:
        physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl  #避免将驼峰命名转换为下划线命名
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850
        #集群名称
        cluster-name: BJ
        #所属命名空间
        namespace: 59486577-18d5-459c-94ad-cbdf6f3d9d5a
       #nacos config 配置
      config:
        server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850
        namespace: 59486577-18d5-459c-94ad-cbdf6f3d9d5a
        group: DEFAULT_GROUP
        file-extension: yaml

• Get the configuration config class and add @RefreshScope annotations

@RestController
@RequestMapping("/config")
//实时刷新注解
@RefreshScope 
public class ConfigController {
    
    
    @Value("${my.message}")
    private String myMessage;

    @Value("${mysql.url}")
    private String mysqlUrl;


    @GetMapping("/viewconfig")
    public String viewconfig() {
    
    
        return "msg==>" + myMessage  + " mySqlUrl=>" + mysqlUrl;
    }
}

• access
  
  • Modify the content in the configuration, 100 is 200
    
  • Real-time refresh completed

Listen for queries

• nacos configuration center
  
  

dataId extension

Get multiple configuration files from nacos

• Create multiple configuration files in nacos abc.yaml,def.yaml

• Get multiple configuration files
  

  cloud:
    nacos:
      discovery:
      config:
        server-addr: 127.0.0.1:8848,127.0.0.1:8849,127.0.0.1:8850
        namespace: 59486577-18d5-459c-94ad-cbdf6f3d9d5a
        group: DEFAULT_GROUP
        file-extension: yaml
        #获取多个配置文件
        ext-config[0]:
         data-id: abc.yaml
         group: DEFAULT_GROUP
         refresh: true #扩展dataId 的动态刷新
        ext-config[1]:
         data-id: def.yaml
         group: DEFAULT_GROUP
         refresh: true

• Restart service
  
  
• Modify the configuration in nacos and revisit the interface (extended configuration file dynamically refreshes)
  
  

dataId priority issue

Priority: dataId generated according to rules > extended dataId (for extended dataId, [n] The larger n, the higher the priority)

• Copy the configuration m-service-resume.yamlin and change the number to 300, 400my.messageabc.yamldef.yaml
  
  

• Restart the project, the result
  

• Priority between extended configuration files, new configuration items
  
  

• result