Alibaba Nacos 学习(一):Nacos介绍与安装
Alibaba Nacos 学习(二):Spring Cloud Nacos Config
Alibaba Nacos 学习(三):Spring Cloud Nacos Discovery - FeignClient,Nacos 服务注册与发现
Alibaba Nacos 学习(四):Nacos Docker
Alibaba Nacos 学习(五):K8S Nacos搭建,使用nfs
Nacos 分布式配置中心
在分布式系统中,由于服务数量巨多,为了方便服务配置文件统一管理,实时更新,所以需要分布式配置中心组件
接入配置中心
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>nacos.server</groupId> <artifactId>nacos.server</artifactId> <name>nacos.server</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-boot.version>2.0.3.RELEASE</spring-boot.version> <nacos-config-spring-boot.version>0.2.1</nacos-config-spring-boot.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> <version>0.2.1.RELEASE</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.5.0</version> </dependency> <!-- swagger-ui --> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.5.0</version> </dependency> </dependencies> </project>
新增控制器
应用会从 Nacos Config 中获取相应的配置,并添加在 Spring Environment 的 PropertySources 中。这里我们使用
@Value
注解来将对应的配置注入到ConfigController中的字段,并添加 @RefreshScope
打开动态刷新功能@RestController @RequestMapping("/config") @RefreshScope public class ConfigController { @Value("${useLocalCache:false}") private boolean useLocalCache; @Value("${user.name}") private String userName; @Value("${user.age}") private Integer userAge; /** * http://localhost:8080/config/get */ @RequestMapping("/get") @ResponseBody public String get() { return "useLocalCache:" + useLocalCache + " userName:" + userName + " userAge:" + userAge; } }
新增注册配置
bootstrap.properties增加以下配置
spring.cloud.nacos.config.server-addr=192.168.50.31:8848 --配置地址 spring.application.name=service-provider --dataid spring.profiles.active=test --运行环境 server.port=8080
登录Nacos控制台
设置相关配置信息
启动项目
2019-11-25 15:05:14.025 INFO 62860 --- [ main] o.s.c.a.n.c.NacosPropertySourceBuilder : Loading nacos data, dataId: 'service-provider-test.properties', group: 'DEFAULT_GROUP' 2019-11-25 15:05:14.025 INFO 62860 --- [ main] b.c.PropertySourceBootstrapConfiguration : Located property source: CompositePropertySource {name='NACOS', propertySources=[NacosPropertySource {name='service-provider-test.properties'}, NacosPropertySource {name='service-provider.properties'}]} 2019-11-25 15:05:14.029 INFO 62860 --- [ main] e.d.example.dockertest.Application : The following profiles are active: test 2019-11-25 15:05:14.043 INFO 62860 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@22c86919: startup date [Mon Nov 25 15:05:14 CST 2019]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@6aa61224 2019-11-25 15:05:14.699 INFO 62860 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=0fd1ef74-7ad3-37d4-b602-1ed486ff9aa7
Loading nacos data, dataId: 'service-provider-test.properties'在Nacos-Server中新建配置,其中Data ID它的定义规则是:${prefix}-${spring.profile.active}.${file-extension}
- prefix 默认为
spring.application.name
的值,也可以通过配置项spring.cloud.nacos.config.prefix
来配置。 - spring.profile.active 即为当前环境对应的
profile
,可以通过配置项spring.profile.active
来配置。 - file-exetension 为配置内容的数据格式,可以通过配置项
spring.cloud.nacos.config.file-extension
来配置。
测试内容:
修改内容
2019-11-25 15:19:24.525 INFO 62860 --- [.168.50.31_8848] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4275635b: startup date [Mon Nov 25 15:19:24 CST 2019]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@12381b77 2019-11-25 15:19:24.556 INFO 62860 --- [.168.50.31_8848] o.s.boot.SpringApplication : Started application in 2.611 seconds (JVM running for 855.251) 2019-11-25 15:19:24.556 INFO 62860 --- [.168.50.31_8848] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@4275635b: startup date [Mon Nov 25 15:19:24 CST 2019]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@12381b77 2019-11-25 15:19:24.556 INFO 62860 --- [.168.50.31_8848] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@12381b77: startup date [Mon Nov 25 15:19:23 CST 2019]; root of context hierarchy 2019-11-25 15:19:24.562 INFO 62860 --- [.168.50.31_8848] o.s.c.e.event.RefreshEventListener : Refresh keys changed: [user.age, user.name]
Refresh keys changed: [user.age, user.name],没有修改useLocalCache字段,所以不会有刷新纪录。