如何使用java（spring）将json对象消息生成到kafka主题中？

Question

我想产生一个Kafka主题的信息。该消息应该具有以下模式：

   {"targetFileInfo":{"path":"2018-05-07-10/row01-small-01.txt.ready"}}

我知道这是一个json模式，那么如何将json转换成字符串呢？

 String stringData = JSON.stringify({"targetFileInfo":{"path":"2018-05-07-10/row01-small-01.txt.ready"}});

 Producer<String, String> producer = null;

    Properties props = new Properties();
    props.put("bootstrap.servers", "localhost:9092");
    props.put("acks", "all");
    props.put("retries", 0);
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

    producer = new KafkaProducer<>(props);
    String msg = "welcome";
    producer.send(new ProducerRecord<String, String>("event", msg));

    producer.close();

Answer 1

这解决了我的问题：

 Producer<String, String> producer = null;

    Properties props = new Properties();
    props.put("bootstrap.servers", "localhost:9092");
    props.put("acks", "all");
    props.put("retries", 0);
    props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

    producer = new KafkaProducer<>(props);

    try {
        producer = new KafkaProducer<String, String>(props);
    } catch (Exception e) {
        e.printStackTrace();
    }
    blobStorageChecker = new BlobStorageChecker();
    String folder = blobStorageChecker.getCurrentDateUTC();
    String msg = "{\"targetFileInfo\":{\"path\":\"test/"+folder+"row01-small.txt\"},\"sourceFileInfo\":{\"lastModifiedTime\":1525437960000,\"file\":\"/row01-small-01.txt\",\"filename\":\"/data/row01/row01-small.txt\",\"size\":19728,\"remoteUri\":\"ftp://waws-prod-am2-191.ftp.net/data/orsted-real/inbound/row01\",\"contentEncoding\":\"\",\"contentType\":\"\"}}";
    ProducerRecord<String, String> record = new ProducerRecord<String, String>("event-orsted-v1", null, msg);
    if (producer != null) {
        try {
            Future<RecordMetadata> future = producer.send(record);
            RecordMetadata metadata = future.get();
        } catch (Exception e) {
            System.err.println(e.getMessage());
            e.printStackTrace();
        }
    }
    producer.close();