Spring_Nacos初识

刚开始接触nacos，然后就报了以下错误，网上也找不到任何解决方法：

Failed to instantiate [com.alibaba.boot.nacos.config.binder.NacosBootConfigurationPropertiesBinder]:

 java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata

java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata

最后看到一个地方说是Spring的版本和Nacos的版本不一致导致的

来源：https://github.com/alibaba/nacos/issues/529

https://github.com/alibaba/nacos/issues/4554

配置流程如下：

//启动类：
//NacosConfigurationProperties
@NacosPropertySource(dataId = "nacos_test", autoRefreshed = true)
@SpringBootApplication
public class NacoApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacoApplication.class, args);
    }

}

//Controller类
@RestController
public class NacosConfigController {
    @NacosValue(value = "${useLocalCache:0}", autoRefreshed = true)
    private String useLocalCache1;

    @Value("${useLocalCache:1}")
    private String useLocalCache2;

    @GetMapping("/hello")
    public String get() {
        return useLocalCache1+"_-_"+useLocalCache2;
    }
}
 
//pom.xml配置类:刚开始选择的Sping2.4.X 就会报错，换成Sping2.3.X的就好了

  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
  </parent>

<dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-starter</artifactId>
            <version>0.2.1</version>
</dependency>

//文件配置类：application.properties

server.port=8090
spring.application.name=tt
nacos.config.server-addr=192.168.1.66:8848

//Nacos配置文件如下：

然后用postman进行测试，发现每次更改nacos_test文件的值，@NacosValue都会实时更新，@Value只会记住初始化启动那次的配置：

https://segmentfault.com/q/1010000021044375