kafka发送同步消息，kafka学习四

小鱼儿 2021-05-10 11:13 878阅读 0赞

1.引入kafka的maven依赖

<dependency>
        <groupId>org.springframework.kafka</groupId>
        <artifactId>spring-kafka</artifactId>
        <version>2.1.0.RELEASE</version>
    </dependency>

2.创建topic

./bin/kafka-topics.sh --create --zookeeper 192.168.211.137:2181 --partitions 3 --replication-factor 1 \
    --topic syn-message

3.代码

package com.wyu.tt06kafkademo.demo;
    import org.apache.kafka.clients.producer.KafkaProducer;
    import org.apache.kafka.clients.producer.ProducerRecord;
    import org.apache.kafka.clients.producer.RecordMetadata;
    
    import java.util.Properties;
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.Future;
    /**
     * 同步发送消息
     */
    
    public class SynProducer { 
        private static Properties getProps(){ 
            Properties props =  new Properties();
            props.put("bootstrap.servers", "192.168.211.137:9092");
            props.put("acks", "all"); // 发送所有ISR
            props.put("retries", 2); // 重试次数
            props.put("batch.size", 16384); // 批量发送大小
            props.put("buffer.memory", 102400); // 缓存大小，根据本机内存大小配置
            props.put("linger.ms", 1000); // 发送频率，满足任务一个条件发送
            props.put("client.id", "producer-syn-1"); // 发送端id,便于统计
            props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            return props;
        }
    
        public static void main(String[] args) { 
            KafkaProducer<String, String> producer = new KafkaProducer<>(getProps());
            //循环发送十个消息
            for(int i=0; i< 10; i++){ 
                ProducerRecord<String, String> record = new ProducerRecord<>("syn-message",
                 "topic_"+i,"message-"+i);
                Future<RecordMetadata> metadataFuture = producer.send(record);
                RecordMetadata recordMetadata = null;
                try { 
                    recordMetadata = metadataFuture.get();
                    System.out.println("发送成功！");
                    System.out.println("topic:"+recordMetadata.topic());
                    System.out.println("partition:"+recordMetadata.partition());
                    System.out.println("offset:"+recordMetadata.offset());
                } catch (InterruptedException|ExecutionException e) { 
                    System.out.println("发送失败！");
                    e.printStackTrace();
                }
            }
            producer.flush();
            producer.close();
        }
    }

4.消费syn-message的数据

bin/kafka-console-consumer.sh --bootstrap-server 192.168.211.137:9092 --from-beginning --topic syn-message

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