SpringBoot Nacos实现自动刷新

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/> <!-- 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);
    }
}

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