背景

需要使用kafka发送文件二进制以及附属信息

案例

发送方

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Properties;public class SendFileToKafka {public static void main(String[] args) {String filePath = "com/example/kafka/file/ConsumerFileByteArrayFromKafka.java";Properties kafkaProps = new Properties();kafkaProps.put("bootstrap.servers", "192.168.56.112:9092");kafkaProps.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");kafkaProps.put("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");KafkaProducer<String, byte[]> producer = new KafkaProducer<>(kafkaProps);InputStream in = SendFileToKafka.class.getResourceAsStream("/com/example/kafka/file/ConsumerFileByteArrayFromKafka.java");try {byte[] buffer = new byte[in.available()];// 读到buffer字节数组中in.read(buffer);ProducerRecord<String, byte[]> record = new ProducerRecord<>("dataTopic", buffer);String header = "aaa";record.headers().add("test_header", header.getBytes(StandardCharsets.UTF_8));producer.send(record);in.close();producer.close();} catch (Exception e) {e.printStackTrace();}}
}

接收方

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.header.Header;
import org.apache.kafka.common.header.Headers;import java.util.Arrays;
import java.util.Properties;public class ConsumerFileByteArrayFromKafka {public static void main(String[] args) {Properties props = new Properties();props.put("bootstrap.servers", "192.168.56.112:9092");props.put("group.id", "group1");props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");props.put("value.deserializer", "org.apache.kafka.common.serialization.ByteArrayDeserializer");KafkaConsumer<String, byte[]> consumer = new KafkaConsumer<>(props);consumer.subscribe(Arrays.asList("dataTopic"));try {while (true) {ConsumerRecords<String, byte[]> records = consumer.poll(100);for (ConsumerRecord<String, byte[]> record : records) {Headers headers = record.headers();Iterable<Header> testHeader = headers.headers("test_header");for (Header header : testHeader) {String recordHeader = new String(header.value(), "UTF-8");System.out.println("recordHeader => " + recordHeader);}byte[] message = record.value();System.out.println(new String(message));}}} catch (Exception e) {e.printStackTrace();} finally {consumer.close();}}
}