SpringBoot Nacos实现自动刷新

背景

SpringBoot 版本


    org.springframework.boot
    spring-boot-starter-parent
    2.6.4
     

Nacos 版本

   
	 ...
	
	
	    com.alibaba.cloud
	    spring-cloud-starter-alibaba-nacos-config
	    2.2.6.RELEASE
	

Spring-Cloud 版本

spring-cloud-alibaba依赖,能对nacos进行版本管理


    
        
            com.alibaba.cloud
            spring-cloud-alibaba-dependencies
            2.2.6.RELEASE
            pom
            import
        
        
            org.springframework.cloud
            spring-cloud-dependencies
            2021.0.1
            pom
            import
        
    

application.yml 配置

  • server-addr:nacos地址
  • namespace:命名空间,即 id
  • group:标识分组
  • file-extension:文件后缀名

spring:
  cloud:
    nacos:
      config:
        server-addr: http://xxx.com
        namespace: name
        group: name
        file-extension: yml

现象

application.yml 配置 myvalue 的值

myvalue: myvalue-test

接口类引用 myvalue

@RestController
@Slf4j
public class TestController extends BaseController {
    @Value("${myvalue}")
    private String myvalue;
    @ApiOperation(value = "测试", notes = "测试value")
    @GetMapping(value = "/test/feng/test")
    NjcResponseEntity testValue() {
        log.info( myvalue);
        return super.success("查询", myvalue);
    }
}

在线修 nacos 上 myvalue 的值

后台可以看到 myvalue 已被修改

2023-01-10 10:56:03.402  WARN  [TID: N/A]  c.a.c.n.c.NacosPropertySourceBuilder:  Ignore the empty nacos configuration and get it based on dataId[pm] & group[pm]
2023-01-10 10:56:03.407  WARN  [TID: N/A]  c.a.c.n.c.NacosPropertySourceBuilder:  Ignore the empty nacos configuration and get it based on dataId[pm.yml] & group[pm]
2023-01-10 10:56:03.415  INFO  [TID: N/A]  o.s.c.b.c.PropertySourceBootstrapConfiguration:  Located property source: [BootstrapPropertySource {name='bootstrapProperties-pm-feng.yml,pm'}, BootstrapPropertySource {name='bootstrapProperties-pm.yml,pm'}, BootstrapPropertySource {name='bootstrapProperties-pm,pm'}]
2023-01-10 10:56:03.417  INFO  [TID: N/A]  o.s.boot.SpringApplication:  The following 1 profile is active: "feng"
2023-01-10 10:56:03.425  INFO  [TID: N/A]  o.s.boot.SpringApplication:  Started application in 0.227 seconds (JVM running for 38.127)
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
2023-01-10 10:56:03.508  INFO  [TID: N/A]  o.s.c.e.event.RefreshEventListener:  Refresh keys changed: [myvalue]

但通过接口获取 myvalue 的值并没有改变

优化

如何修改为自动更新,加上注解 @RefreshScope 即可

@RestController
@Slf4j
@RefreshScope
public class TestController extends BaseController {
    @Value("${myvalue}")
    private String myvalue;
    @ApiOperation(value = "测试", notes = "测试value")
    @GetMapping(value = "/test/feng/test")
    NjcResponseEntity testValue() {
        log.info( myvalue);
        return super.success("查询", myvalue);
    }
}

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