SpringBoot Nacos实现自动刷新

背景

SpringBoot 版本

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.6.4</version>
   <relativePath/> <!-- lookup parent from repository -->
</parent>

Nacos 版本

<dependencies>  
...
<!--nacos-->
<dependency>
   <groupId>com.alibaba.cloud</groupId>
   <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
   <version>2.2.6.RELEASE</version>
</dependency>
</dependencies>

Spring-Cloud 版本

spring-cloud-alibaba依赖，能对nacos进行版本管理

<dependencyManagement>
   <dependencies>
       <dependency>
           <groupId>com.alibaba.cloud</groupId>
           <artifactId>spring-cloud-alibaba-dependencies</artifactId>
           <version>2.2.6.RELEASE</version>
           <type>pom</type>
           <scope>import</scope>
       </dependency>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-dependencies</artifactId>
           <version>2021.0.1</version>
           <type>pom</type>
           <scope>import</scope>
       </dependency>
   </dependencies>
</dependencyManagement>

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);
   }
}

来源：https://blog.csdn.net/weixin_42555971/article/details/128625639