如何使用java（spring）将json对象消息生成到kafka主题中？

Question

我想在 kafka 主题中生成一条消息。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，那么我如何将该 json 转换为字符串？

我使用的是maven项目，所以需要使用哪些依赖

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

所以我认为最好不要将 Json 转换为字符串并将该消息发送到 kafka 主题。

我的代码是这样的，它可以发送一个字符串，但我不知道如何修改我的代码来发送上面的消息。也许你可以帮助我。

 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();