java kafka 生产者和消费者的代码实例

生产者

import com.google.common.collect.Lists;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.junit.Test;

import java.util.List;
import java.util.Properties;

import static org.apache.kafka.clients.producer.ProducerConfig.*;
import static org.apache.kafka.streams.StreamsConfig.BOOTSTRAP_SERVERS_CONFIG;
/**
 * kafka 发数据
 */
public class ProducerTest {
    @Test
    public void producer() {
        Properties conf = new Properties();
        conf.setProperty(BOOTSTRAP_SERVERS_CONFIG, "192.168.1.191:9092");
        conf.put(ACKS_CONFIG, "all");
        conf.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        conf.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer");
        KafkaProducer producer = new KafkaProducer<>(conf);
        String toTopic = "test_lxk";
        List list = Lists.newArrayList(
                "message1",
                "message2",
                "message3",
                "message4"
        );
        String key = null;
        for (String value : list) {
            ProducerRecord record = new ProducerRecord<>(toTopic, key, value);
            try {
                // 简单的直接send，在消费的时候，是消费不到的
                //producer.send(record);
                producer.send(record).get();
            } catch (Exception e){
                System.out.println(e.toString());
            }
        }

    }
}

消费者：

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.junit.Test;

import java.util.Map;
import java.util.Properties;
import java.util.TreeMap;

import static org.apache.kafka.clients.consumer.ConsumerConfig.*;
import static org.apache.kafka.streams.StreamsConfig.BOOTSTRAP_SERVERS_CONFIG;

/**
 * 消费数据
 */
public class ConsumerTest {

    @Test
    @SuppressWarnings("unchecked")
    public void test() {
        KafkaConsumer consumer = new KafkaConsumer<>(conf());
        consumer.subscribe(Lists.newArrayList("business_lxk_12", "business_lxk_34"));

        try {
            while (true){
                ConsumerRecords records = consumer.poll(100);
                for (ConsumerRecord record : records) {
                    String key = record.key();
                    int partition = record.partition();
                    String topic = record.topic();
                    long offset = record.offset();
                    String value = record.value();
                    Map map = JsonUtils.parseJsonToObj(value, Map.class);
                    if (map != null) {
                        TreeMap treeMap = Maps.newTreeMap();
                        map.forEach(treeMap::put);
                        System.out.println(topic + "  " +JsonUtils.parseObjToJson(treeMap));
                    }
                }
            }
        } catch (Exception e){
            System.out.println(e);
        } finally {
            consumer.close();
        }

    }

    private static Properties conf() {
        Properties conf = new Properties();
        conf.setProperty(BOOTSTRAP_SERVERS_CONFIG, "192.168.1.191:9092");
        conf.setProperty(GROUP_ID_CONFIG, "lxk");
        conf.setProperty(ENABLE_AUTO_COMMIT_CONFIG, "true");
        conf.setProperty(AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
        conf.setProperty(AUTO_OFFSET_RESET_CONFIG, "latest");
        conf.setProperty(KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        conf.setProperty(VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        return conf;
    }
}