SpringCloud（二）：nacos作为配置中心
填写Data Id：appA_A、Group：APPA_GROUP、选中文件格式：yaml，填写配置内容：
name: xx
age: 23
保存并发布。
<properties> <java.version>8</java.version> <!-- spring platform --> <spring.boot.version>2.3.4.RELEASE</spring.boot.version> <spring.cloud.version>Hoxton.SR3</spring.cloud.version> <spring.data.version>Moore-SR5</spring.data.version> <alibaba.version>2.2.0.RELEASE</alibaba.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencyManagement> <dependencies> <!-- SpringFramework把需要升级版本的组件放到前面 --> <!-- spring boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>${spring.boot.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- spring cloud --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring.cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> <!-- spring data --> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-releasetrain</artifactId> <version>${spring.data.version}</version> <scope>import</scope> <type>pom</type> </dependency> <!-- spring alibaba --> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${alibaba.version}</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-client</artifactId> <version>1.4.1</version> </dependency> </dependencies> </dependencyManagement> <dependencies> <!--SpringCloud ailibaba nacos --> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> </dependency> <!-- SpringBoot整合Web组件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
spring:
cloud:
nacos:
config:
enabled: true
server-addr: 127.0.0.1:8848
file-extension: yaml
namespace: tenantA
group: APPA_GROUP
prefix: appA_A
data-id: appA_A
refresh.enabled: true
encode: UTF-8
timeout: 10000
context-path: /nacos
username: nacos
password: nacos
注意：nacos配置中心配置内容必须写在bootstrap.yml文件中，如果写入application-*.yml或者application.yml中均不生效。
这个和springboot启动时SpringApplicationContext父子容器有关系。
@Configuration(proxyBeanMethods = false) public class NacosTestConfig { @Value("${name}") private String name; @Value("${age}") private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
@SpringBootApplication(scanBasePackages = {"com.xx.xx"}, proxyBeanMethods = false)
@EnableDiscoveryClient
public class Main {
/**
* 主程序入口(jar格式)
* @param args 命令行参数
* @throws Exception 执行异常
*/
public static void main(String[] args) throws Exception {
new SpringApplication().run(Main.class, args);
String userName = applicationContext.getEnvironment().getProperty("name");
String userAge = applicationContext.getEnvironment().getProperty("age");
System.out.println("my name:" + userName + "; age:" + userAge);
final NacosTestConfig nacosTestConfig = applicationContext.getBean(NacosTestConfig.class);
System.out.println("my name:" + nacosTestConfig.getName() + "; age:" + nacosTestConfig.getAge());;
}
}
启动输出：
2021-04-01 22:02:32.106 INFO 21759 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.3.4.RELEASE) 2021-04-01 22:02:33.507 INFO 21759 --- [ restartedMain] c.a.n.c.c.impl.LocalConfigInfoProcessor : LOCAL_SNAPSHOT_PATH:/Users/dz/nacos/config 2021-04-01 22:02:33.519 INFO 21759 --- [ restartedMain] c.a.nacos.client.config.utils.JvmUtil : isMultiInstance:false 2021-04-01 22:02:33.534 WARN 21759 --- [ restartedMain] c.a.c.n.c.NacosPropertySourceBuilder : Ignore the empty nacos configuration and get it based on dataId[appA_A.yaml] & group[APPA_GROUP] 2021-04-01 22:02:33.539 WARN 21759 --- [ restartedMain] c.a.c.n.c.NacosPropertySourceBuilder : Ignore the empty nacos configuration and get it based on dataId[appA_A-uat.yaml] & group[APPA_GROUP] 2021-04-01 22:02:33.540 INFO 21759 --- [ restartedMain] b.c.PropertySourceBootstrapConfiguration : Located property source: [BootstrapPropertySource {name='bootstrapProperties-appA_A-uat.yaml,APPA_GROUP'}, BootstrapPropertySource {name='bootstrapProperties-appA_A.yaml,APPA_GROUP'}, BootstrapPropertySource {name='bootstrapProperties-appA_A,APPA_GROUP'}] 2021-04-01 22:02:33.543 INFO 21759 --- [ restartedMain] com.dx.App : The following profiles are active: uat 2021-04-01 22:02:33.976 WARN 21759 --- [ restartedMain] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format. 2021-04-01 22:02:34.029 INFO 21759 --- [ restartedMain] o.s.cloud.context.scope.GenericScope : BeanFactory id=b6d01e0a-0ee2-36c7-9603-d720f3ac0aa5 2021-04-01 22:02:34.306 INFO 21759 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 12003 (http) 2021-04-01 22:02:34.311 INFO 21759 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2021-04-01 22:02:34.312 INFO 21759 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.38] 2021-04-01 22:02:34.370 INFO 21759 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2021-04-01 22:02:34.371 INFO 21759 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 817 ms 2021-04-01 22:02:34.462 WARN 21759 --- [ restartedMain] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'nacos-config' contains invalid characters, please migrate to a valid format. 2021-04-01 22:02:34.463 WARN 21759 --- [ restartedMain] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'nacos-discovery' contains invalid characters, please migrate to a valid format. 2021-04-01 22:02:34.513 WARN 21759 --- [ restartedMain] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources. 2021-04-01 22:02:34.513 INFO 21759 --- [ restartedMain] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2021-04-01 22:02:34.516 WARN 21759 --- [ restartedMain] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources. 2021-04-01 22:02:34.516 INFO 21759 --- [ restartedMain] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath. 2021-04-01 22:02:34.660 INFO 21759 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor' 2021-04-01 22:02:35.744 INFO 21759 --- [ restartedMain] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname 2021-04-01 22:02:35.750 INFO 21759 --- [ restartedMain] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService 'Nacso-Watch-Task-Scheduler' 2021-04-01 22:02:35.755 INFO 21759 --- [ restartedMain] com.alibaba.nacos.client.naming : initializer namespace from System Property :null 2021-04-01 22:02:35.755 INFO 21759 --- [ restartedMain] com.alibaba.nacos.client.naming : initializer namespace from System Environment :null 2021-04-01 22:02:35.755 INFO 21759 --- [ restartedMain] com.alibaba.nacos.client.naming : initializer namespace from System Property :null 2021-04-01 22:02:35.923 INFO 21759 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729 2021-04-01 22:02:36.929 INFO 21759 --- [ restartedMain] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname 2021-04-01 22:02:36.953 INFO 21759 --- [ restartedMain] o.s.b.a.e.web.EndpointLinksResolver : Exposing 2 endpoint(s) beneath base path '/actuator' 2021-04-01 22:02:37.025 INFO 21759 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 12003 (http) with context path '' 2021-04-01 22:02:37.027 INFO 21759 --- [ restartedMain] com.alibaba.nacos.client.naming : [BEAT] adding beat: BeatInfo{port=12003, ip='192.168.0.100', weight=1.0, serviceName='APPA_GROUP@@nacos-payment-provider', cluster='DEFAULT', metadata={preserved.register.source=SPRING_CLOUD}, scheduled=false, period=5000, stopped=false} to beat map. 2021-04-01 22:02:37.028 INFO 21759 --- [ restartedMain] com.alibaba.nacos.client.naming : [REGISTER-SERVICE] tenantA registering service APPA_GROUP@@nacos-payment-provider with instance: Instance{instanceId='null', ip='192.168.0.100', port=12003, weight=1.0, healthy=true, enabled=true, ephemeral=true, clusterName='DEFAULT', serviceName='null', metadata={preserved.register.source=SPRING_CLOUD}} 2021-04-01 22:02:37.034 INFO 21759 --- [ restartedMain] c.a.c.n.registry.NacosServiceRegistry : nacos registry, APPA_GROUP nacos-payment-provider 192.168.0.100:12003 register finished 2021-04-01 22:02:38.038 INFO 21759 --- [ restartedMain] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname 2021-04-01 22:02:38.053 INFO 21759 --- [ restartedMain] com.dx.App : Started App in 7.261 seconds (JVM running for 14.713) 2021-04-01 22:02:38.059 INFO 21759 --- [ restartedMain] c.a.n.client.config.impl.ClientWorker : [fixed-127.0.0.1_8848-tenantA] [subscribe] appA_A+APPA_GROUP+tenantA 2021-04-01 22:02:38.060 INFO 21759 --- [ restartedMain] c.a.nacos.client.config.impl.CacheData : [fixed-127.0.0.1_8848-tenantA] [add-listener] ok, tenant=tenantA, dataId=appA_A, group=APPA_GROUP, cnt=1 2021-04-01 22:02:38.060 INFO 21759 --- [ restartedMain] c.a.n.client.config.impl.ClientWorker : [fixed-127.0.0.1_8848-tenantA] [subscribe] appA_A.yaml+APPA_GROUP+tenantA 2021-04-01 22:02:38.060 INFO 21759 --- [ restartedMain] c.a.nacos.client.config.impl.CacheData : [fixed-127.0.0.1_8848-tenantA] [add-listener] ok, tenant=tenantA, dataId=appA_A.yaml, group=APPA_GROUP, cnt=1 2021-04-01 22:02:38.060 INFO 21759 --- [ restartedMain] c.a.n.client.config.impl.ClientWorker : [fixed-127.0.0.1_8848-tenantA] [subscribe] appA_A-uat.yaml+APPA_GROUP+tenantA 2021-04-01 22:02:38.060 INFO 21759 --- [ restartedMain] c.a.nacos.client.config.impl.CacheData : [fixed-127.0.0.1_8848-tenantA] [add-listener] ok, tenant=tenantA, dataId=appA_A-uat.yaml, group=APPA_GROUP, cnt=1 my name:kdk; age:3322 my name:kdk; age:3322 2021-04-01 22:02:38.391 INFO 21759 --- [)-192.168.0.100] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet' 2021-04-01 22:02:38.391 INFO 21759 --- [)-192.168.0.100] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet' 2021-04-01 22:02:38.396 INFO 21759 --- [)-192.168.0.100] o.s.web.servlet.DispatcherServlet : Completed initialization in 5 ms
基础才是编程人员应该深入研究的问题，比如:
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2）mysql索引存储结构&如何调优/b-tree特点、计算复杂度及影响复杂度的因素。。。
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4）Java类加载器运行原理
5）Java中GC过程原理|使用的回收算法原理
6）Redis中hash一致性实现及与hash其他区别
7）Java多线程、线程池开发、管理Lock与Synchroined区别
8）Spring IOC/AOP 原理；加载过程的。。。
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