SpringCloud Nacos配置中心
nacos配置使用有2种
一种是全局的，在应用启动的时候与applocation.properties合并成新的配置文件
一种是局部引用，并可以动态更新
使用流程以2023.0.3.3为例子
引入依赖
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId><version>2023.0.3.3</version></dependency>
新版本与老版本有区别，新的不要求使用bootstrap.yml文件，直接在application配置文件添加即可
applocation.properties添加配置
spring.cloud.nacos.server-addr=http://192.168.68.238:8848
spring.config.import[0]=nacos:mysql?refreshEnabled=true
其中mysql在nacos中配置如下
系统启动会会先拉去nacos配置与本地配置合并
22:02:41.759 [main] INFO com.alibaba.nacos.common.ability.discover.NacosAbilityManagerHolder -- [AbilityControlManager] Successfully initialize AbilityControlManager. ____ _ __ _ _/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \\\/ ___)| |_)| | | | | || (_| | ) ) ) )' |____| .__|_| |_|_| |_\__, | / / / /=========|_|==============|___/=/_/_/_/:: Spring Boot :: (v3.2.4)2025-07-22T22:02:43.442+08:00 INFO 5568 --- [demo1] [ main] org.example.demo1.Demo1Application : Starting Demo1Application using Java 21.0.1 with PID 5568 (F:\java\test1\demo1\target\classes started by FRT in F:\java\test1\demo1)
2025-07-22T22:02:43.443+08:00 INFO 5568 --- [demo1] [ main] org.example.demo1.Demo1Application : The following 1 profile is active: "dev"
2025-07-22T22:02:43.655+08:00 INFO 5568 --- [demo1] [ main] c.a.c.n.c.NacosConfigDataLoader : [Nacos Config] Load config[dataId=mysql, group=DEFAULT_GROUP] success
2025-07-22T22:02:46.231+08:00 INFO 5568 --- [demo1] [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=79902dc9-ee9c-3928-bf51-f1ad48ed6e40
2025-07-22T22:02:46.692+08:00 WARN 5568 --- [demo1] [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.client.loadbalancer.LoadBalancerAutoConfiguration$DeferringLoadBalancerInterceptorConfig' of type [org.springframework.cloud.client.loadbalancer.LoadBalancerAutoConfiguration$DeferringLoadBalancerInterceptorConfig] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying). The currently created BeanPostProcessor [lbRestClientPostProcessor] is declared through a non-static factory method on that class; consider declaring it as static instead.
2025-07-22T22:02:46.698+08:00 WARN 5568 --- [demo1] [ main] trationDelegate$BeanPostProcessorChecker : Bean 'deferringLoadBalancerInterceptor' of type [org.springframework.cloud.client.loadbalancer.DeferringLoadBalancerInterceptor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying). Is this bean getting eagerly injected into a currently created BeanPostProcessor [lbRestClientPostProcessor]? Check the corresponding BeanPostProcessor declaration and its dependencies.
2025-07-22T22:02:47.321+08:00 INFO 5568 --- [demo1] [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port 8080 (http)
2025-07-22T22:02:47.350+08:00 INFO 5568 --- [demo1] [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2025-07-22T22:02:47.351+08:00 INFO 5568 --- [demo1] [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.19]
2025-07-22T22:02:47.565+08:00 INFO 5568 --- [demo1] [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2025-07-22T22:02:47.568+08:00 INFO 5568 --- [demo1] [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3906 ms
Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
Get /192.168.68.121 network interface
Get network interface info: name:wireless_32768 (Intel(R) Centrino(R) Advanced-N 6205)
Initialization Sequence datacenterId:2 workerId:20_ _ |_ _ _|_. ___ _ | _
| | |\/|_)(_| | |_\ |_)||_|_\ / | 3.5.12
2025-07-22T22:02:49.929+08:00 INFO 5568 --- [demo1] [ main] o.s.c.openfeign.FeignClientFactoryBean : For 'demo1' URL not provided. Will try picking an instance via load-balancing.
2025-07-22T22:02:50.047+08:00 INFO 5568 --- [demo1] [ main] c.a.c.n.a.NacosAnnotationProcessor : [Nacos Config] Listening config for annotation: dataId=test, group=DEFAULT_GROUP
2025-07-22T22:02:50.177+08:00 INFO 5568 --- [demo1] [ main] c.a.c.n.a.NacosAnnotationProcessor : [Nacos Config] register demo1Application#filed#test listener on org.example.demo1.Demo1Application$$SpringCGLIB$$0@4bdef487
2025-07-22T22:02:52.836+08:00 INFO 5568 --- [demo1] [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2025-07-22T22:02:52.898+08:00 INFO 5568 --- [demo1] [ main] m.e.s.MybatisPlusApplicationContextAware : Register ApplicationContext instances org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@3eda0aeb
2025-07-22T22:02:54.049+08:00 INFO 5568 --- [demo1] [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2025-07-22T22:02:54.088+08:00 WARN 5568 --- [demo1] [ main] iguration$LoadBalancerCaffeineWarnLogger : Spring Cloud LoadBalancer is currently working with the default cache. While this cache implementation is useful for development and tests, it's recommended to use Caffeine cache in production.You can switch to using Caffeine cache, by adding it and org.springframework.cache.caffeine.CaffeineCacheManager to the classpath.
2025-07-22T22:02:54.319+08:00 INFO 5568 --- [demo1] [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080 (http) with context path ''
2025-07-22T22:02:54.349+08:00 INFO 5568 --- [demo1] [ main] c.a.n.p.a.s.c.ClientAuthPluginManager : [ClientAuthPluginManager] Load ClientAuthService com.alibaba.nacos.client.auth.impl.NacosClientAuthServiceImpl success.
2025-07-22T22:02:54.349+08:00 INFO 5568 --- [demo1] [ main] c.a.n.p.a.s.c.ClientAuthPluginManager : [ClientAuthPluginManager] Load ClientAuthService com.alibaba.nacos.client.auth.ram.RamClientAuthServiceImpl success.
2025-07-22T22:02:54.421+08:00 INFO 5568 --- [demo1] [ main] c.a.c.n.registry.NacosServiceRegistry : nacos registry, DEFAULT_GROUP demo1 192.168.56.1:8080 register finished
2025-07-22T22:02:55.431+08:00 INFO 5568 --- [demo1] [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2025-07-22T22:02:55.454+08:00 INFO 5568 --- [demo1] [ main] org.example.demo1.Demo1Application : Started Demo1Application in 16.826 seconds (process running for 18.746)
2025-07-22T22:02:55.464+08:00 INFO 5568 --- [demo1] [ main] c.a.c.n.refresh.NacosContextRefresher : [Nacos Config] Listening config: dataId=mysql, group=DEFAULT_GROUP
2025-07-22T22:03:08.769+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2025-07-22T22:03:08.770+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2025-07-22T22:03:08.773+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 3 ms
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1d160d9c] was not registered for synchronization because synchronization is not active
2025-07-22T22:03:08.936+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2025-07-22T22:03:09.339+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Added connection com.mysql.cj.jdbc.ConnectionImpl@adfbf37
2025-07-22T22:03:09.342+08:00 INFO 5568 --- [demo1] [nio-8080-exec-1] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
JDBC Connection [HikariProxyConnection@718283189 wrapping com.mysql.cj.jdbc.ConnectionImpl@adfbf37] will not be managed by Spring
==> Preparing: SELECT id,unionid,token,username,password,nick_name,phone,head_url,ring,register_time,last_login_time FROM app_user WHERE id=?
==> Parameters: 11(String)
<== Columns: id, unionid, token, username, password, nick_name, phone, head_url, ring, register_time, last_login_time
<== Row: 11, , Xdtk2sBFPpLMx5J0Qz-io1KmOn4UyIgC6cZDv87YwhGVejTN39uSRlHA, test,
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1d160d9c]
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@685b68c5] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@1721535422 wrapping com.mysql.cj.jdbc.ConnectionImpl@adfbf37] will not be managed by Spring
==> Preparing: SELECT id,unionid,token,username,password,nick_name,phone,head_url,ring,register_time,last_login_time FROM app_user WHERE id=?
==> Parameters: 11(String)
<== Columns: id, unionid, token, username, password, nick_name, phone, head_url, ring, register_time, last_login_time
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@685b68c5]
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@57cd7671] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@1493861112 wrapping com.mysql.cj.jdbc.ConnectionImpl@adfbf37] will not be managed by Spring
==> Preparing: SELECT id,unionid,token,username,password,nick_name,phone,head_url,ring,register_time,last_login_time FROM app_user WHERE id=?
==> Parameters: 11(String)
<== Columns: id, unionid, token, username, password, nick_name, phone, head_url, ring, register_time, last_login_time
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@57cd7671]
在日志中提示Load config[dataId=mysql, group=DEFAULT_GROUP] success
并且原配置中无数据库配置，引用nacos后访问数据库成功
局部参数测试，随便定一个变量，使用注解@NacosConfig
@NacosConfig(dataId = "test", group = "DEFAULT_GROUP", key = "test.t1")private String test;
test内容
默认test值为nacos中的test.t1 的值32432434244543535353，并且支持动态跟新，在nacos更新后程序无需重启test变量自动更新
@GetMapping("/test")public String test() {return test;}写个测试方法访问http://localhost:8080/test测试成功！