springcloud -nacos-配置中心-接入

1.nacaosClient接入：

　　pom.xml引入依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-actuator</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-logging</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba.nacos</groupId>
    <artifactId>nacos-client</artifactId>
    <version>1.3.1</version>
</dependency>

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
</dependency>

　　添加nacosconfig配置

@Configuration
public class NacosConfig {

    @Bean
    public ConfigService configService() throws NacosException {
        final Properties properties = new Properties();
        //设置Nacos节点，对应的IP地址。
        properties.setProperty(PropertyKeyConst.SERVER_ADDR,"127.0.0.1:8848");
        //设置命名空间。
        properties.setProperty(PropertyKeyConst.NAMESPACE,"……");
        //如果开启Nacos权限校验，设置用户名。
        properties.setProperty(PropertyKeyConst.USERNAME,"nacos");
        //如果开启Nacos权限校验，设置用户密码。
        properties.setProperty(PropertyKeyConst.PASSWORD,"nacos");
        //设置获取配置信息的长轮训超时时间。
        properties.setProperty(PropertyKeyConst.CONFIG_LONG_POLL_TIMEOUT,"3000");
        //设置获取配置信息失败之后，重试的次数。
        properties.setProperty(PropertyKeyConst.CONFIG_RETRY_TIME,"5");
        //设置是否开启客户端主动拉取最新的配置信息。
        properties.setProperty(PropertyKeyConst.ENABLE_REMOTE_SYNC_CONFIG,"true");
        //设置最大重试次数。
        properties.setProperty(PropertyKeyConst.MAX_RETRY,"5");
        //构造一个ConfigService实例
        ConfigService configService = NacosFactory.createConfigService(properties);
        return configService;
    }
}

　　调用获取nacos配置

@Component
public class NacosConfigManager {

    @Resource
    private ConfigService configService;

    @PostConstruct
    private void init() throws NacosException {
        String data=configService.getConfig("use-nacos-client-nacos-config","use-nacos-client-nacos-config",2000);
        System.out.println("通过Nacos Client 从Nacos配置中心获取配置信息为："+data);
    }

}

　　2.api 接入

　　　　pom.mxl引入依赖 

     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>

　　初始化restTemplate

@Configuration
public class OpenApiConfig {
    @Bean
    public RestTemplate restTemplate() {
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setConnectTimeout(2000);
        requestFactory.setReadTimeout(2000);
        RestTemplate restTemplate = new RestTemplate(requestFactory);
        return restTemplate;
    }
}

　　通过restTemplate读取配置信息

@Component
public class ReaderConfigManager {

    @Resource
    private RestTemplate restTemplate;

    //使用RestTemplate访问Nacos Config的Open API
    @PostConstruct
    public void readConfig(){
        String url="http://127.0.0.1:8848/nacos/v1/cs/configs?dataId={dataId}&group={group}&tenant={tenant}";
        Map<String,String> params=new HashMap<String,String>(16);
        params.put("dataId", "openapi-nacos-config");
        params.put("group", "openapi-nacos-config");
        params.put("tenant","c7ba173f-29e5-4c58-ae78-b102be11c4f9");
        //入参
        ResponseEntity<String> responseEntity=restTemplate.getForEntity(url,String.class,params);
        String result=responseEntity.getBody();
        System.out.println("通过Open API 从Nacos配置中心获取配置信息为："+result);
    }
}

　　3.springcloudAlibabaConfig接入

　　　　pom.xml引入

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

　　新增配置文件bootstrap.yaml

spring:
  application:
    name: spring-cloud-alibaba-config
  cloud:
    nacos:
      config:
        namespace: ……
        group: spring-cloud-alibaba-config
        password: nacos
        enable-remote-sync-config: true
        server-addr: 127.0.0.1:8848
        username: nacos
        name: spring-cloud-alibaba-config
        file-extension: properties
        extension-configs:
          - data-id: spring-cloud-alibaba-config-test.yaml
            group: spring-cloud-alibaba-config
            namespace: ……
            refresh: true
server:
  port: 8889

　　新增application.properties

spring.youxia.config.name=test2
spring.application.name=spring-cloud-alibaba-config

　　在nacos中新增配dataId 为spring-cloud-alibaba-config.properties的配置文件 ，其中配置

spring.youxia.config.name=test20
获取配置文件代码：

@Configuration
@RefreshScope
public class ConfigReader {

    @Autowired
    private NacosConfig nacosConfig;

    @PostConstruct
    public void init() {
        Executors.newCachedThreadPool().execute(new ConfigThread());
    }

    class ConfigThread implements Runnable {
        @Override
        public void run() {
            while (true) {
                System.out.println("使用Spring Cloud Alibaba接入Nacos配置中心，获取配置信息name为：" + nacosConfig.getName());
                System.out.println("使用Spring Cloud Alibaba接入Nacos配置中心，获取配置信息value为："+nacosConfig.getValue());
                try {
                    Thread.sleep(6000);
                } catch (InterruptedException e) {
                    System.out.println(e.getMessage());
                }
            }
        }
    }
}

@Data
@Configuration
@RefreshScope
@ConfigurationProperties (prefix = "spring.youxia.config")
public class NacosConfig {
    private boolean name;
    
}