Nacos 修改后自动刷新

╰+哭是因爲堅強的太久メ 2024-03-30 16:59 68阅读 0赞

#### 文章目录 ####

*  背景
 *  现象
 *  优化

## 背景 ##

SpringBoot 版本

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

Nacos 版本

<dependencies>   
    	 ...
     
    	
    	<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);
        }
    }