我在用Kafka。这是我的代码，我想把信息发送到Kafka服务器，主题名是“west”，信息是“message1”。我没有收到任何错误，虽然我没有看到我在主题中发送的信息有什么问题吗？

class SimpleProducer {

  public static void main(String[] args) throws Exception{       
    Properties props = new Properties();
    props.put("bootstrap.servers","172.xxxxxxxxx:9092");
    props.put("serializer.class", "kafka.serializer.DefaultEncoder");
    props.put("acks", "1");
    props.put("retries", 1);
    props.put("batch.size", 16384);
    props.put("linger.ms", 0);
    props.put("client.id", "foo");
    props.put("buffer.memory", 33554432);
    props.put("timeout.ms", "500");
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.setProperty(ProducerConfig.MAX_BLOCK_MS_CONFIG, "500"); 
    props.setProperty(ProducerConfig.RETRY_BACKOFF_MS_CONFIG, "100");

    System.out.println("ready to send msg");

    try {
        Producer<String, String> producer = new KafkaProducer<String, String>(props);

        producer.send(new ProducerRecord<String, String>("west","message1"));

        System.out.println("Message sent successfully");
        producer.close();
    }
    catch(Exception e)
    {
        System.out.println("Messgae doesn't sent successfully");
        e.printStackTrace();

    }
  }
}