RocketMQ生产者一个应用不能发送多个NameServer消息解决

// 创建第一个DefaultMQProducer
DefaultMQProducer producer1 = new DefaultMQProducer("producer_group_1");
    // 设置nameServer地址
    producer1.setNamesrvAddr("192.168.2.230:9876");
    try {
      producer1.start();
      // 发送消息
      SendResult result1 = producer1.send(new Message("cluster_A_topic", "ping".getBytes(StandardCharsets.UTF_8)));
      switch (result1.getSendStatus()) {
        case SEND_OK:
          System.out.println("cluster_A_topic 发送成功！");
          break;
        case FLUSH_DISK_TIMEOUT:
          System.out.println("cluster_A_topic 持久化失败！");
          break;
        case FLUSH_SLAVE_TIMEOUT:
          System.out.println("cluster_A_topic 同步slave失败！");
          break;
        case SLAVE_NOT_AVAILABLE:
          System.out.println("cluster_A_topic 副本不可用！");
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    // 创建第二个DefaultMQProducer
    DefaultMQProducer producer2 = new DefaultMQProducer("producer_group_2");
    // 设置nameServer地址
    producer2.setNamesrvAddr("192.168.2.231:9876");
    try {
      producer2.start();
      // 发送消息
      SendResult result2 = producer2.send(new Message("cluster_B_topic", "ping".getBytes(StandardCharsets.UTF_8)));
      switch (result2.getSendStatus()) {
        case SEND_OK:
          System.out.println("cluster_B_topic 发送成功！");
          break;
        case FLUSH_DISK_TIMEOUT:
          System.out.println("cluster_B_topic 持久化失败！");
          break;
        case FLUSH_SLAVE_TIMEOUT:
          System.out.println("cluster_B_topic 同步slave失败！");
          break;
        case SLAVE_NOT_AVAILABLE:
          System.out.println("cluster_B_topic 副本不可用！");
      }
      return "ok";
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      producer1.shutdown();
      producer2.shutdown();
    }