基本概念
- 通过Nacos Server和nacos-config-spring-boot-starter实现配置的动态变更
- 通过Nacos Server和nacos-discovery-spring-boot-starter实现服务的注册与发现\
配置管理
- 启动了Nacos server后,为SpringBoot应用启动Nacos配置管理服务
- 添加nacos-config-spring-boot-starter依赖:
<dependency>
<groupId>com.alibaba.boot</groupId>
<artifactId>nacos-config-spring-boot-starter</artifactId>
<version>0.2.7</version>
</dependency>
- 在application.properties中配置Nacos server的地址:
nacos.config.server-addr=127.0.0.1:8848
- 使用 @NacosPropertySource加载dataId为nacosConfig的配置源,并开启自动更新:
@SpringBootApplication
@NacosPropertySource(dataId = "nacosConfig", autoRefreshed = true)
public class NacosConfigApplication {
public static void main(String[] args) {
SpringApplication.run(NacosConfigApplication.class, args);
}
}
- 通过Nacos的 @NacosValue注解设置属性值
@Controller
@RequestMapping("config")
public class ConfigController {
@NacosValue(value = "${useLocalCache:false}", autoRefreshed = true)
private boolean useLocalCache;
@RequestMapping(value = "/get", method = GET)
@ResponseBody
public boolean get() {
return useLocalCache;
}
}
- 启动NacosConfigApplication, 调用方法,查看返回的内容为false
curl http://localhost:8080/config/get
- 通过调用Nacos Open API向Nacos Server发布配置 : dataId为nacosConfig, 内容为useLocalCache=true
curl -X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacosConfig&group=DEFAULT_GROUP&content=useLocalCache=true"
- 再次访问浏览器地址,返回内容为true, 说明程序中的useLocalCache值已经被动态更新
http://localhost:8080/config/get
服务发现与注册
- 首先启动Nacos服务器,开启Nacos的服务发现功能
- 添加nacos-discovery-spring-boot-starter依赖:
<dependency>
<groupId>com.alibaba.boot</groupId>
<artifactId>nacos-discovery-spring-boot-starter</artifactId>
<version>0.2.7</version>
</dependency>
- 在application.properties中配置Nacos server的地址:
nacos.discovery.server-addr=127.0.0.1:8848
- 使用 @NacosInjected注入Nacos的NamingService实例
@Controller
@RequestMapping("discovery")
public class DiscoveryController {
@NacosInjected
private NamingService namingService;
@RequestMapping(value = "/get", method = GET)
@ResponseBody
public List<Instance> get(@RequestParam String serviceName) throws NacosException {
return namingService.getAllInstances(serviceName);
}
}
@SpringBootApplication
public class NacosDiscoveryApplication {
public static void main(String[] args) {
SpringApplication.run(NacosDiscoveryApplication.class, args);
}
}
- 启动NacosDiscoveryApplication, 调用方法,此时返回为空JSON数组
curl http://localhost:8080/discovery/get?serviceName=nacosService
- 通过调用Nacos Open API向Nacos server注册一个名称为nacosService服务
curl -X PUT 'http://127.0.0.1:8848/nacos/v1/ns/instance?serviceName=nacosService&ip=127.0.0.1&port=8080'
[
{
"instanceId": "127.0.0.1-8080-DEFAULT-example",
"ip": "127.0.0.1",
"port": 8080,
"weight": 1.0,
"healthy": true,
"cluster": {
"serviceName": null,
"name": "",
"healthChecker": {
"type": "TCP"
},
"defaultPort": 80,
"defaultCheckPort": 80,
"useIPPort4Check": true,
"metadata": {}
},
"service": null,
"metadata": {}
}
]