最近实物资产管理运维产品pams系统架构搭建中，涉及到配置中心的问题，在这里做个记录，作为第一手经验分享，也是自我备忘吧。
整个体系，目前一共有10+个中等粒度的微服务，每个服务都有自己的yml配置文件，这些给人的感觉就有些不太方便，尤其是上系统后，若仅仅因为改一个参数，重新打包（jar文件解压后，再打包回来，编码校验过不了。。。），或者就算是war包，也得上系统重新改文件，然后重启啊，不能集中管控，效率低下，不利于维护。
于是，打算引入配置中心，配置中心是一个非常陈旧的概念，实现方式也有非常多的种类，但是实现思想基本是一样的，那就是中心管控配置，修改后，服务端立刻监听到，并且按需生效，不需要重新启动服务程序。 当前比较主流的，可能就算Apollo，Nacos，Consul等等，还可以自己设计实现。。。
好了，接下来说下本次的经历吧。
1. 框架版本信息
springcloud 版本greenwich.RELEASE springboot 版本2.1.9.RELEASE Nacos server 版本2.0.1
2. Nacos server配置
2.1 从官方网站下载源码（https://github.com/alibaba/nacos/tree/2.0.1）并做编译和基本配置
G:\workspace\nacos-2.0.1\nacos-2.0.1\mvn -Prelease-nacos -Dmaven.test.skip=true clean install -U
编译完成后，将G:\workspce\nacos-2.0.1\nacos-2.0.1\distribution\target\nacos-server-2.0.1目录下的nacos拷贝到G:\workspce\nacos-2.0.1\nacos-2.0.1\distribution\下面。
进入G:\workspce\nacos-2.0.1\nacos-2.0.1\distribution\nacos\conf， 修改application.properties文件，主要修改下面的参数（数据源相关信息）：
#*************** Spring Boot Related Configurations ***************# ### Default web context path: server.servlet.contextPath=/nacos ### Default web server port: server.port=8848 #*************** Network Related Configurations ***************# ### If prefer hostname over ip for Nacos server addresses in cluster.conf: # nacos.inetutils.prefer-hostname-over-ip=false ### Specify local server's IP: nacos.inetutils.ip-address=10.94.100.131 #*************** Config Module Related Configurations ***************# ### If use MySQL as datasource: spring.datasource.platform=mysql ### Count of DB: db.num=1 ### Connect URL of DB: db.url.0=jdbc:mysql://100.95.198.30:3306/nacos?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC db.user.0=xxx db.password.0=xxxxx
2.2 初始化数据源
创建一个数据库命名为nacos，并将G:\workspce\nacos-2.0.1\nacos-2.0.1\distribution\nacos\conf下的nacos-mysql.sql导入到这个nacos数据库，导入完成后，有下面的表。
config_info, config_info_aggr, config_info_beta, config_info_tag, config_tags_relation, group_capacity, his_config_info, permissions, roles, tenant_capacity, tenant_info, users
2.3 启动nacos server
因为这里验证的逻辑，是在windows环境下，所以才有bat的脚步启动，startup.bat -m standalone
G:\workspce\nacos-2.0.1\nacos-2.0.1\distribution\nacos\bin>startup.cmd -m standalone "nacos is starting with standalone" ,--. ,--.'| ,--,: : | Nacos 2.0.1 ,`--.'`| ' : ,---. Running in stand alone mode, All function modules | : : | | ' ,'\ .--.--. Port: 8848 : | \ | : ,--.--. ,---. / / | / / ' Pid: 10968 | : ' '; | / \ / \. ; ,. :| : /`./ Console: http://10.94.100.131:8848/nacos/index.html ' ' ;. ;.--. .-. | / / '' | |: :| : ;_ | | | \ | \__\/: . .. ' / ' | .; : \ \ `. https://nacos.io ' : | ; .' ," .--.; |' ; :__| : | `----. \ | | '`--' / / ,. |' | '.'|\ \ / / /`--' / ' : | ; : .' \ : : `----' '--'. / ; |.' | , .-./\ \ / `--'---' '---' `--`---' `----'
2.4 登录nacos服务
默认的账号密码是nacos/nacos
登录进来后的界面如下：
在nacos侧，配置上dataId，以及具体的参数
3. springcloud服务侧配置
3.1 在resources目录下构建bootstrap.yml(bootstrap加载顺序优先于application)
spring: application: name: micro-system-mgmt #切换配置文件 profiles: active: dev cloud: nacos: config: server-addr: 10.94.100.131:8848 file-extension: yaml
3.2 pom.xml
在pom.xml中添加下面的依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
3.3 原来默认配置信息的配置
类似数据库，redis缓存信息，可以依旧保存在application-dev.yml/application-prd.yml中, 不区分生产和测试等环境的参数，例如日志，mybatis，pagehelper等，可以写入application.xml。
可变的参数，涉及到业务相关的逻辑参数，可以通过Nacos配置服务进行接管。
说明：
1. 数据库连接等所有的信息，其实都可以通过Nacos进行接管。 2. 本地配置application-dev.yml或者application-prd.yml,同时配置Nacos配置中心，依然可以同时作用。相同的参数，配置中心的数据优先级高于本地配置文件，替换本地配置.
4. springcloud应用层代码要求
在需要动态变更参数的地方，需要通过@RefreshScope配合@Value的方式，或者@ConfigurationProperties方式，触发动态刷新。
@Api("测试各种框架的基本功能是否OK") @RestController @RequestMapping("/ts") @RefreshScope //出于灵活应用考虑，建议采用此注解 public class TestController { @Value("${nacos.hello}") private String hello; private Logger logger = LoggerFactory.getLogger(TestController.class); @ApiOperation(value = "接口调用，验证Nacos配置", notes = "整合Nacos的配置管理，参数是否实时刷新") @ApiImplicitParam(name = "param", value = "参数名称", required = true, dataType = "String", paramType = "query") @GetMapping(value = "/nacos/info") public String checkNacos(@RequestParam("param") String param) { logger.info("hello: " + hello); return hello; } }
启动运行报错:
2021-06-22 10:27:48.739 INFO [main]o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker.postProcessAfterInitialization:330 - Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$e02d6bc] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.9.RELEASE) 2021-06-22 10:27:50.024 INFO [main]com.taikang.pams.systemmgmt.SystemMgmtApplication.logStartupProfileInfo:652 - The following profiles are active: dev 2021-06-22 10:27:51.791 WARN [main]org.springframework.boot.actuate.endpoint.EndpointId.logWarning:131 - Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format. 2021-06-22 10:27:51.880 WARN [main]org.springframework.boot.actuate.endpoint.EndpointId.logWarning:131 - Endpoint ID 'hystrix.stream' contains invalid characters, please migrate to a valid format. 2021-06-22 10:27:52.312 INFO [main]org.springframework.cloud.context.scope.GenericScope.setSerializationId:294 - BeanFactory id=016fb783-119b-3df3-91bb-89efaaa5451d 2021-06-22 10:27:52.398 INFO [main]o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker.postProcessAfterInitialization:330 - Bean 'druid-stat-pointcut' of type [org.springframework.aop.support.JdkRegexpMethodPointcut] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2021-06-22 10:27:52.400 INFO [main]o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker.postProcessAfterInitialization:330 - Bean 'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0' of type [org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2021-06-22 10:27:52.768 INFO [main]o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker.postProcessAfterInitialization:330 - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$f1e8d3bf] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2021-06-22 10:27:52.814 INFO [main]o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker.postProcessAfterInitialization:330 - Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$e02d6bc] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2021-06-22 10:27:53.416 INFO [main]o.s.boot.web.embedded.tomcat.TomcatWebServer.initialize:90 - Tomcat initialized with port(s): 9002 (http) 2021-06-22 10:27:53.438 INFO [main]org.apache.coyote.http11.Http11NioProtocol.log:173 - Initializing ProtocolHandler ["http-nio-9002"] 2021-06-22 10:27:53.449 INFO [main]org.apache.catalina.core.StandardService.log:173 - Starting service [Tomcat] 2021-06-22 10:27:53.449 INFO [main]org.apache.catalina.core.StandardEngine.log:173 - Starting Servlet engine: [Apache Tomcat/9.0.26] 2021-06-22 10:27:53.673 INFO [main]o.a.catalina.core.ContainerBase.[Tomcat].[localhost].[/].log:173 - Initializing Spring embedded WebApplicationContext 2021-06-22 10:27:53.674 INFO [main]org.springframework.web.context.ContextLoader.prepareWebApplicationContext:284 - Root WebApplicationContext: initialization completed in 3628 ms 2021-06-22 10:27:53.917 WARN [main]com.netflix.config.sources.URLConfigurationSource.<init>:121 - No URLs will be polled as dynamic configuration sources. 2021-06-22 10:27:53.918 INFO [main]com.netflix.config.sources.URLConfigurationSource.<init>:122 - To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2021-06-22 10:27:53.935 INFO [main]com.netflix.config.DynamicPropertyFactory.getInstance:281 - DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@61da0413 2021-06-22 10:27:55.080 INFO [main]com.alibaba.druid.pool.DruidDataSource.init:930 - {dataSource-1} inited 2021-06-22 10:27:56.445 INFO [main]org.springframework.cloud.commons.util.InetUtils.convertAddress:170 - Cannot determine local hostname 2021-06-22 10:27:56.915 INFO [main]o.s.boot.actuate.endpoint.web.ServletEndpointRegistrar.register:74 - Registered '/actuator/hystrix.stream' to hystrix.stream-actuator-endpoint 2021-06-22 10:27:57.988 INFO [main]o.s.boot.actuate.endpoint.web.EndpointLinksResolver.<init>:58 - Exposing 20 endpoint(s) beneath base path '/actuator' 2021-06-22 10:27:58.186 INFO [main]s.d.s.web.PropertySourcedRequestMappingHandlerMapping.initHandlerMethods:69 - Mapped URL path [/v2/api-docs] onto method [public org.springframework.http.ResponseEntity<springfox.documentation.spring.web.json.Json> springfox.documentation.swagger2.web.Swagger2Controller.getDocumentation(java.lang.String,javax.servlet.http.HttpServletRequest)] 2021-06-22 10:27:58.221 WARN [main]com.netflix.config.sources.URLConfigurationSource.<init>:121 - No URLs will be polled as dynamic configuration sources. 2021-06-22 10:27:58.221 INFO [main]com.netflix.config.sources.URLConfigurationSource.<init>:122 - To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2021-06-22 10:27:58.502 INFO [main]o.s.scheduling.concurrent.ThreadPoolTaskExecutor.initialize:171 - Initializing ExecutorService 'applicationTaskExecutor' 2021-06-22 10:28:00.592 INFO [main]org.springframework.cloud.commons.util.InetUtils.convertAddress:170 - Cannot determine local hostname 2021-06-22 10:28:01.072 INFO [main]o.s.cloud.netflix.eureka.InstanceInfoFactory.create:71 - Setting initial instance status as: STARTING 2021-06-22 10:28:01.111 INFO [main]com.netflix.discovery.DiscoveryClient.<init>:349 - Initializing Eureka in region us-east-1 2021-06-22 10:28:01.474 INFO [main]com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>:70 - Using JSON encoding codec LegacyJacksonJson 2021-06-22 10:28:01.475 INFO [main]com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>:71 - Using JSON decoding codec LegacyJacksonJson 2021-06-22 10:28:01.643 INFO [main]com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>:80 - Using XML encoding codec XStreamXml 2021-06-22 10:28:01.644 INFO [main]com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>:81 - Using XML decoding codec XStreamXml 2021-06-22 10:28:02.061 INFO [main]c.n.discovery.shared.resolver.aws.ConfigClusterResolver.getClusterEndpoints:43 - Resolving eureka endpoints via configuration 2021-06-22 10:28:02.161 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:958 - Disable delta property : false 2021-06-22 10:28:02.161 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:959 - Single vip registry refresh property : null 2021-06-22 10:28:02.161 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:960 - Force full registry fetch : false 2021-06-22 10:28:02.161 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:961 - Application is null : false 2021-06-22 10:28:02.161 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:962 - Registered Applications size is zero : true 2021-06-22 10:28:02.162 INFO [main]com.netflix.discovery.DiscoveryClient.fetchRegistry:964 - Application version is -1: true 2021-06-22 10:28:02.162 INFO [main]com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry:1047 - Getting all instance registry info from the eureka server 2021-06-22 10:28:02.524 INFO [main]com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry:1056 - The response status is 200 2021-06-22 10:28:02.526 INFO [main]com.netflix.discovery.DiscoveryClient.initScheduledTasks:1270 - Starting heartbeat executor: renew interval is: 30 2021-06-22 10:28:02.529 INFO [main]com.netflix.discovery.InstanceInfoReplicator.<init>:60 - InstanceInfoReplicator onDemand update allowed rate per min is 4 2021-06-22 10:28:02.533 INFO [main]com.netflix.discovery.DiscoveryClient.<init>:449 - Discovery Client initialized at timestamp 1624328882531 with initial instances count: 0 2021-06-22 10:28:02.541 INFO [main]o.s.c.n.eureka.serviceregistry.EurekaServiceRegistry.register:42 - Registering application MICRO-SYSTEM-MGMT with eureka with status UP 2021-06-22 10:28:02.542 INFO [main]com.netflix.discovery.DiscoveryClient.notify:1305 - Saw local status change event StatusChangeEvent [timestamp=1624328882542, current=UP, previous=STARTING] 2021-06-22 10:28:02.544 INFO [main]s.d.spring.web.plugins.DocumentationPluginsBootstrapper.start:160 - Context refreshed 2021-06-22 10:28:02.553 INFO [DiscoveryClient-InstanceInfoReplicator-0]com.netflix.discovery.DiscoveryClient.register:826 - DiscoveryClient_MICRO-SYSTEM-MGMT/localhost:micro-system-mgmt:9002: registering service... 2021-06-22 10:28:02.644 INFO [main]s.d.spring.web.plugins.DocumentationPluginsBootstrapper.start:163 - Found 1 custom documentation plugin(s) 2021-06-22 10:28:02.753 INFO [main]s.d.spring.web.scanners.ApiListingReferenceScanner.scan:41 - Scanning for api listing references 2021-06-22 10:28:02.837 INFO [DiscoveryClient-InstanceInfoReplicator-0]com.netflix.discovery.DiscoveryClient.register:835 - DiscoveryClient_MICRO-SYSTEM-MGMT/localhost:micro-system-mgmt:9002 - registration status: 204 2021-06-22 10:28:02.938 INFO [main]s.d.s.w.readers.operation.CachingOperationNameGenerator.startingWith:40 - Generating unique operation named: userUsingGET_1 2021-06-22 10:28:02.969 WARN [main]o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext.refresh:557 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.testController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'nacos.hello' in value "${nacos.hello}" 2021-06-22 10:28:02.973 INFO [main]o.s.scheduling.concurrent.ThreadPoolTaskExecutor.shutdown:208 - Shutting down ExecutorService 'applicationTaskExecutor' 2021-06-22 10:28:03.002 INFO [main]com.alibaba.druid.pool.DruidDataSource.close:1825 - {dataSource-1} closed 2021-06-22 10:28:03.261 WARN [AsyncReporter{org.springframework.cloud.sleuth.zipkin2.sender.RestTemplateSender@38cfecf3}]o.s.c.annotation.AnnotationConfigApplicationContext.refresh:557 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaRibbonClientConfiguration': Unsatisfied dependency expressed through field 'eurekaConfig'; nested exception is org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'eurekaInstanceConfigBean': Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!) 2021-06-22 10:28:03.264 INFO [main]com.netflix.discovery.DiscoveryClient.shutdown:888 - Shutting down DiscoveryClient ... 2021-06-22 10:28:06.266 INFO [main]com.netflix.discovery.DiscoveryClient.unregister:922 - Unregistering ... 2021-06-22 10:28:06.282 INFO [main]com.netflix.discovery.DiscoveryClient.unregister:924 - DiscoveryClient_MICRO-SYSTEM-MGMT/localhost:micro-system-mgmt:9002 - deregister status: 200 2021-06-22 10:28:06.293 INFO [main]com.netflix.discovery.DiscoveryClient.shutdown:911 - Completed shut down of DiscoveryClient 2021-06-22 10:28:06.294 INFO [main]org.apache.catalina.core.StandardService.log:173 - Stopping service [Tomcat] 2021-06-22 10:28:06.298 WARN [main]org.apache.catalina.loader.WebappClassLoaderBase.log:173 - The web application [ROOT] appears to have started a thread named [RxIoScheduler-1 (Evictor)] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809) java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) java.lang.Thread.run(Thread.java:745) 2021-06-22 10:28:06.315 INFO [main]o.s.b.a.logging.ConditionEvaluationReportLoggingListener.logMessage:136 - Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2021-06-22 10:28:06.338 ERROR[main]org.springframework.boot.SpringApplication.reportFailure:823 - Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.testController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'nacos.hello' in value "${nacos.hello}" at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:382) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$1(AbstractBeanFactory.java:356) at org.springframework.cloud.context.scope.GenericScope$BeanLifecycleWrapper.getBean(GenericScope.java:390) at org.springframework.cloud.context.scope.GenericScope.get(GenericScope.java:184) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:353) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105) at org.springframework.cloud.context.scope.refresh.RefreshScope.eagerlyInitialize(RefreshScope.java:130) at org.springframework.cloud.context.scope.refresh.RefreshScope.start(RefreshScope.java:121) at org.springframework.cloud.context.scope.refresh.RefreshScope.onApplicationEvent(RefreshScope.java:115) at org.springframework.cloud.context.scope.refresh.RefreshScope.onApplicationEvent(RefreshScope.java:71) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:402) at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:359) at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:896) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:744) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:391) at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1204) at com.taikang.pams.systemmgmt.SystemMgmtApplication.main(SystemMgmtApplication.java:57) Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'nacos.hello' in value "${nacos.hello}" at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:851) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1196) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1175) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:595) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376) ... 28 common frames omitted
查阅网络经验以及官方文档，都有各种说辞，Nacos的版本和springcloud之间有较为密切的关系，可以说Nacos的版本兼容性不是太好么？尝试了几次，最终将springcloud服务侧的pom配置调整为下面的内容：
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
然后再次启动，就正常了，通过正常启动的日志可以看出，启动过程中，有nacos相关的日志打印：
2021-06-22 10:40:20.532 INFO [main]c.alibaba.cloud.nacos.client.NacosPropertySourceBuilder.loadNacosData:87 - Loading nacos data, dataId: 'micro-system-mgmt-dev.yaml', group: 'DEFAULT_GROUP' 2021-06-22 10:40:20.552 INFO [main]o.s.c.b.config.PropertySourceBootstrapConfiguration.initialize:98 - Located property source: CompositePropertySource {name='NACOS', propertySources=[NacosPropertySource {name='micro-system-mgmt-dev.yaml'}, NacosPropertySource {name='micro-system-mgmt.yaml'}]} 2021-06-22 10:40:20.584 INFO [main]com.taikang.pams.systemmgmt.SystemMgmtApplication.logStartupProfileInfo:652 - The following profiles are active: dev
下面看看刷新操作：
修改配置后，点击发布：
测试：
整体来看，Nacos使用还是比较简单的，唯独要注意的是Nacos与项目集成的时候，pom配置依赖，有版本的匹配问题。
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