Nacos是阿里巴巴开发的用于发现、配置和治理微服务。与Spring Cloud Alibaba完满联合。Nacos 提供了一组简略易用的个性集，帮忙您疾速实现动静服务发现、服务配置、服务元数据及流量治理。Nacos是国产的，所以中文文档也很丰盛。
启动配置管理
引入依赖
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> <version>2.2.5.RELEASE</version> </dependency> </dependencies> <!-- SpringCloud依赖，起到治理版本的作用 --> <dependencyManagement> <dependencies> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${com-alibaba-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement>配置
在利用的 /src/main/resources/bootstrap.properties 配置文件中配置 Nacos Config 元数据
spring.application.name=spring-cloud-alibaba-nacos-config-examplespring.cloud.nacos.config.server-addr=127.0.0.1:8848须要先启动Nacos，否则启动后会有些报错
实现上述两步后，利用会从 Nacos Config 中获取相应的配置，并增加在 Spring Environment 的 PropertySources 中。这里咱们应用 @Value 注解来将对应的配置注入到 SampleController 的 userName 和 age 字段，并增加 @RefreshScope 关上动静刷新性能
@RefreshScope class SampleController { @Value("${user.name}") String userName; @Value("${user.age}") int age; }启动 Nacos Server 并增加配置
下载Nacos
GitHub地址：https://github.com/alibaba/nacos/releases
启动 Server
进去其绝对文件夹 nacos/bin，并对照操作系统理论状况执行如下命令。详情参考官网文档。
- Linux/Unix/Mac 操作系统，执行命令
sh startup.sh -m standalone - Windows 操作系统，执行命令
cmd startup.cmd
在命令行执行如下命令，向 Nacos Server 中增加一条配置。
POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacos-config-example.properties&group=DEFAULT_GROUP&content=user.id=1%0Auser.name=james%0Auser.age=17"启动服务发现
引入依赖
父级
<properties> <java.version>1.8</java.version> <com-alibaba-cloud.version>2.2.5.RELEASE</com-alibaba-cloud.version></properties><modules> <module>nacos-discovery-consumer</module> <module>nacos-discovery-provider</module></modules><dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency></dependencies><!-- SpringCloud依赖，起到治理版本的作用 --><dependencyManagement> <dependencies> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>${com-alibaba-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies></dependencyManagement>consumer
<properties> <spring-cloud-netflix.version>2.2.5.RELEASE</spring-cloud-netflix.version></properties><dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-ribbon</artifactId> <version>${spring-cloud-netflix.version}</version> </dependency> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> <exclusions> <exclusion> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-client</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-client</artifactId> </dependency></dependencies>provider
<dependencies> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId> </dependency> <dependency> <groupId>com.alibaba.nacos</groupId> <artifactId>nacos-client</artifactId> </dependency></dependencies>增加注解
通过 Spring Cloud 原生注解 @EnableDiscoveryClient 开启服务注册发现性能
// 开启服务注册发现性能@SpringBootApplication@EnableDiscoveryClientpublic class NacosDiscoveryProviderApplication { public static void main(String[] args) { SpringApplication.run(NacosDiscoveryProviderApplication.class, args); }}配置
在 application.properties 中配置 Nacos server 的地址
consumer
server.port=18083spring.application.name=service-consumerspring.cloud.nacos.discovery.server-addr=127.0.0.1:8848# nacos认证信息spring.cloud.nacos.username=nacosspring.cloud.nacos.password=nacosprovier
server.port=18082spring.application.name=service-providerspring.cloud.nacos.discovery.server-addr=127.0.0.1:8848# nacos认证信息spring.cloud.nacos.username=nacosspring.cloud.nacos.password=nacosconsumer
- config
通过 Spring Cloud 原生注解 @EnableDiscoveryClient 开启服务注册发现性能。给 RestTemplate 实例增加 @LoadBalanced 注解，开启 @LoadBalanced 与 Ribbon 的集成
@Configurationpublic class NacosConfig { @LoadBalanced @Bean public RestTemplate restTemplate() { return new RestTemplate(); }}- controller
@RestControllerpublic class TestController { @Autowired private RestTemplate restTemplate; @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET) public String echo(@PathVariable String str) { return restTemplate.getForObject("http://service-provider/echo/" + str, String.class); }}provier
- controller
@RestControllerpublic class TestController { @RequestMapping(value = "/echo/{string}", method = RequestMethod.GET) public String echo(@PathVariable String string) { return "Hello Nacos Discovery " + string; }}最初启动 ProviderApplication 和 ConsumerApplication ，调用 http://localhost:8080/echo/2021，返回内容为 Hello Nacos Discovery 2021`。
References
[1] Nacos Config Example: https://github.com/alibaba/spring-cloud-alibaba/blob/master/spring-cloud-alibaba-examples/nacos-example/nacos-config-example/readme-zh.md
[2] Nacos Spring Cloud: https://nacos.io/zh-cn/docs/quick-start-spring-cloud.html
[3] Nacos: https://nacos.io/zh-cn/docs/quick-start.html