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消费者API

news 2025/8/20 7:19:31

独立消费者案例（订阅主题）

在这里插入图片描述

package com.tsg.kafka.consumer;import org.apache.kafka.clients.consumer.ConsumerConfig;
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.serialization.StringDeserializer;import java.time.Duration;
import java.util.ArrayList;
import java.util.Properties;public class CustomConsumer {public static void main(String[] args) {Properties properties = new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"master:9092,slave1:9092");properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);ArrayList<String> topics = new ArrayList<String>();topics.add("first");kafkaConsumer.subscribe(topics);while (true){ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofSeconds(1));for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {System.out.println(consumerRecord);}}}
}

独立消费者案例（订阅分区）

在这里插入图片描述

package com.tsg.kafka.consumer;import org.apache.kafka.clients.consumer.ConsumerConfig;
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.TopicPartition;
import org.apache.kafka.common.serialization.StringDeserializer;import java.time.Duration;
import java.util.ArrayList;
import java.util.Properties;public class CustomConsumerPartition {public static void main(String[] args) {Properties properties = new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"master:9092,slave1:9092");properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);ArrayList<TopicPartition> topicPartitions = new ArrayList<>();topicPartitions.add(new TopicPartition("first",0));kafkaConsumer.assign(topicPartitions);while (true){ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofSeconds(1));for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {System.out.println(consumerRecord);}}}
}

消费者组案例

测试同一个主题的分区数据，只能由于一个消费者组中的一个一个消费

消费者1

package com.tsg.kafka.consumer;import org.apache.kafka.clients.consumer.ConsumerConfig;
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.serialization.StringDeserializer;import java.time.Duration;
import java.util.ArrayList;
import java.util.Properties;public class CustomConsumer {public static void main(String[] args) {Properties properties = new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"master:9092,slave1:9092");properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);ArrayList<String> topics = new ArrayList<String>();topics.add("four");kafkaConsumer.subscribe(topics);while (true){ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofSeconds(1));for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {System.out.println(consumerRecord);}}}
}

消费者2

package com.tsg.kafka.consumer;import org.apache.kafka.clients.consumer.ConsumerConfig;
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.serialization.StringDeserializer;import java.time.Duration;
import java.util.ArrayList;
import java.util.Properties;public class CustomConsumer1 {public static void main(String[] args) {Properties properties = new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"master:9092,slave1:9092");properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);ArrayList<String> topics = new ArrayList<String>();topics.add("four");kafkaConsumer.subscribe(topics);while (true){ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofSeconds(1));for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {System.out.println(consumerRecord);}}}
}

消费者3

package com.tsg.kafka.consumer;import org.apache.kafka.clients.consumer.ConsumerConfig;
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.serialization.StringDeserializer;import java.time.Duration;
import java.util.ArrayList;
import java.util.Properties;public class CustomConsumer2 {public static void main(String[] args) {Properties properties = new Properties();properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"master:9092,slave1:9092");properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());properties.put(ConsumerConfig.GROUP_ID_CONFIG,"test");KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<String, String>(properties);ArrayList<String> topics = new ArrayList<String>();topics.add("four");kafkaConsumer.subscribe(topics);while (true){ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofSeconds(1));for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {System.out.println(consumerRecord);}}}
}

三个消费者的组ID相同，会形成消费者组，每个消费者消费一个分区数据

生产者发送数据

package com.tsg.kafka.producer;
import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;public class CustomProducerCallback {public static void main(String[] args) {Properties properties = new Properties();// 连接集群properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "master:9092,slave1:9092");// 指定对应的key和value的序列化类型properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());// 设置acksproperties.put(ProducerConfig.ACKS_CONFIG,"all");// 重试次数retries，默认是int最大值,2^31 - 1properties.put(ProducerConfig.RETRIES_CONFIG,3);properties.put(ProducerConfig.PARTITIONER_CLASS_CONFIG,"com.tsg.kafka.producer.MyPartitioner");// 创建kafka生产者对象KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties);// 发送数据for (int i = 0; i < 5; i++) {kafkaProducer.send(new ProducerRecord<String, String>("four",2,"","分区2"), new Callback() {public void onCompletion(RecordMetadata metadata, Exception exception) {if(exception == null){System.out.println("主题：" +metadata.topic() + " 分区: " +metadata.partition());}}});}// 关闭资源kafkaProducer.close();}
}

package com.tsg.kafka.producer;
import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;public class CustomProducerCallback {public static void main(String[] args) {Properties properties = new Properties();// 连接集群properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "master:9092,slave1:9092");// 指定对应的key和value的序列化类型properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());// 设置acksproperties.put(ProducerConfig.ACKS_CONFIG,"all");// 重试次数retries，默认是int最大值,2^31 - 1properties.put(ProducerConfig.RETRIES_CONFIG,3);properties.put(ProducerConfig.PARTITIONER_CLASS_CONFIG,"com.tsg.kafka.producer.MyPartitioner");// 创建kafka生产者对象KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties);// 发送数据for (int i = 0; i < 5; i++) {kafkaProducer.send(new ProducerRecord<String, String>("four",1,"","分区2"), new Callback() {public void onCompletion(RecordMetadata metadata, Exception exception) {if(exception == null){System.out.println("主题：" +metadata.topic() + " 分区: " +metadata.partition());}}});}// 关闭资源kafkaProducer.close();}
}


```c
package com.tsg.kafka.producer;
import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;public class CustomProducerCallback {public static void main(String[] args) {Properties properties = new Properties();// 连接集群properties.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "master:9092,slave1:9092");// 指定对应的key和value的序列化类型properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());// 设置acksproperties.put(ProducerConfig.ACKS_CONFIG,"all");// 重试次数retries，默认是int最大值,2^31 - 1properties.put(ProducerConfig.RETRIES_CONFIG,3);properties.put(ProducerConfig.PARTITIONER_CLASS_CONFIG,"com.tsg.kafka.producer.MyPartitioner");// 创建kafka生产者对象KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties);// 发送数据for (int i = 0; i < 5; i++) {kafkaProducer.send(new ProducerRecord<String, String>("four",0,"","分区2"), new Callback() {public void onCompletion(RecordMetadata metadata, Exception exception) {if(exception == null){System.out.println("主题：" +metadata.topic() + " 分区: " +metadata.partition());}}});}// 关闭资源kafkaProducer.close();}
}