nacos-springboot配置中心使用

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先启动nacos服务

案例如下：

• 结合springboot，application.properties配置：

nacos.config.server-addr=127.0.0.1:8848

 endpoint http://localhost:8080/actuator/nacos-config
 health http://localhost:8080/actuator/health
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

• pom配置：

 <properties>
        <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>
            <version>${spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-starter</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>nacos-config-spring-boot-actuator</artifactId>
            <version>${nacos-config-spring-boot.version}</version>
        </dependency>
       
    </dependencies>

• 启动主类：NacosConfigApplication.java

@SpringBootApplication
@NacosPropertySource(dataId = "example", autoRefreshed = true)
public class NacosConfigApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosConfigApplication.class, args);
    }
}

• 测试demo：ConfigController.java

import com.alibaba.nacos.api.annotation.NacosInjected;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.annotation.NacosValue;
import com.alibaba.nacos.api.exception.NacosException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import static org.springframework.web.bind.annotation.RequestMethod.GET;

@Controller
@RequestMapping("config")
public class ConfigController {

    private static final Logger log = LoggerFactory.getLogger(ConfigController.class);

    @NacosInjected
    ConfigService configService;

    @NacosValue(value = "${useLocalCache:xxx}", autoRefreshed = true)
    private String useLocalCache;

    @RequestMapping(value = "/get", method = GET)
    @ResponseBody
    public String get() {
    // http://localhost:8080/config/get
        return useLocalCache;
    }

    @RequestMapping(value = "/publish", method = GET)
    @ResponseBody
    public String doPublish() {
    // http://localhost:8080/config/publish
        try {
            log.info("原始值{}", configService.getConfig("example", "DEFAULT_GROUP", 20000));
            configService.publishConfig("example", "DEFAULT_GROUP", "useLocalCache=api更改");
            log.info("更改后的值{}", configService.getConfig("example", "DEFAULT_GROUP", 20000));

            return "SUCESS";
        } catch (NacosException e) {
            e.printStackTrace();
            return "FALSE";
        }
    }

• 此时我们访问http://localhost:8080/config/get，得到的值是默认值：xxx
• 自定义配置，登陆nacos控制台:http://127.0.0.1:8848/nacos/
  在配置列表中，打开dateId为example的配置，编辑。如果没有这个dateId，就点击“+”，自行添加
  
  添加配置：
  useLocalCache=ssss
  
  再次访问http://localhost:8080/config/get，得到结果：ssss，配置实时生效。

使用ConfigService，改变控制台的值

代码如上，思路就是使用NacosInjected注解，获取ConfigService，然后利用api更改nacos配置
访问http://localhost:8080/config/publish，刷新控制台，可以看到控制台的值已经变成如下，已经实时更改