使用JAVA获取nacos配置信息出现null,获取不到的解决

 <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <version>2.0.3</version>
  </dependency>

import java.util.Properties;
import java.util.concurrent.Executor;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.PropertyKeyConst;
import com.alibaba.nacos.api.config.ConfigService;
import com.alibaba.nacos.api.config.listener.Listener;
import com.alibaba.nacos.api.exception.NacosException;

public class TestN {

    public static void main(String[] args) throws NacosException, InterruptedException {
        String serverAddr = "139.9.5.70:8848";
        String dataId = "nacos_simpe";
        String group = "DEFAULT_GROUP";
        Properties properties = new Properties();
        properties.put(PropertyKeyConst.SERVER_ADDR, serverAddr);
        ConfigService configService = NacosFactory.createConfigService(properties);
        String content = configService.getConfig(dataId, group, 5000);
        System.out.println(content);
        configService.addListener(dataId, group, new Listener() {
            @Override
            public void receiveConfigInfo(String configInfo) {
                System.out.println("recieve:" + configInfo);
            }

            @Override
            public Executor getExecutor() {
                return null;
            }
        });

        boolean isPublishOk = configService.publishConfig(dataId, group, "content");
        System.out.println(isPublishOk);

        Thread.sleep(3000);
        content = configService.getConfig(dataId, group, 5000);
        System.out.println(content);

        boolean isRemoveOk = configService.removeConfig(dataId, group);
        System.out.println(isRemoveOk);
        Thread.sleep(3000);

        content = configService.getConfig(dataId, group, 5000);
        System.out.println(content);
        Thread.sleep(300000);
    }
}


```bash
在这里插入代码片