Kafka简单入门与Spring结合实践

落日映苍穹つ 2022-05-15 10:09 228阅读 0赞

> # **Kafka简单入门与Spring结合实践** #

### **一、【安装部署kafka服务器环境（centos7.0）】: ** ###

**1.【注意】新版的kafka已经内置了一个zookeeper环境**

2.【安装与运行】：

可以在kafka官网 [http://kafka.apache.org/downloads][http_kafka.apache.org_downloads]下载到最新的kafka安装包，选择下载二进制版本的tgz文件，本章用的是版本2.11\_2.0.0，在centos7.0 直接解压即可

3.【运行命令】：

./zookeeper-server-start.sh ../config/zookeeper.properties &
    
    ./kafka-server-start.sh ../config/server.properties &

4.【注意】：

**【问题一】**：Java端的消费者取不到消息，生产者消息也没发送成功，java通过kafka-client的API写的代码始终不能跟kafka通信：java producer的消息发不出去， java comsumer也收不到任何消息

**【解决办法】**：修改kafka/config/server.properties 中的advertised.listeners 这个值改成自己虚拟机IP地址

![70][]

**【问题二】**：WARN \[Consumer clientId=consumer-1, groupId=console-consumer-950\] Connection to node -1 could not be established. Broker may not be available.

**【解决办法】**：查看本机宿主机是否可以ping通centos7.0 虚拟机的IP地址，一般ping不通，虚拟机的IP地址改变了。

###  二**、【Java程序 + Spring -Kafka 运行实例】:**  ###

### **参考博客：**[https://www.cnblogs.com/hei12138/p/7805475.html][https_www.cnblogs.com_hei12138_p_7805475.html] ###

**1.【Java程序】 ：**

pom.xml 依赖配置：【注意】：其中版本号要与服务器端版本一致

<dependency>
                    <groupId>org.apache.kafka</groupId>
                    <artifactId>kafka-clients</artifactId>
                    <version>2.0.0</version>
                    <exclusions>
                        <exclusion>
                            <groupId>org.slf4j</groupId>
                            <artifactId>slf4j-log4j12</artifactId>
                        </exclusion>
                    </exclusions>
                </dependency>
                <dependency>
                    <groupId>org.apache.kafka</groupId>
                    <artifactId>kafka-streams</artifactId>
                    <version>2.0.0</version>
                    <exclusions>
                        <exclusion>
                            <groupId>org.slf4j</groupId>
                            <artifactId>slf4j-log4j12</artifactId>
                        </exclusion>
                    </exclusions>
                </dependency>

【主题配置】：TopicMain.java

package com.caox.kafka._01_topic;
    
    import org.apache.kafka.clients.admin.AdminClient;
    import org.apache.kafka.clients.admin.CreateTopicsResult;
    import org.apache.kafka.clients.admin.NewTopic;
    
    import java.util.ArrayList;
    import java.util.Properties;
    import java.util.concurrent.ExecutionException;
    
    /**
     * Created by nazi on 2018/8/27.
     * @author nazi
     */
    public class TopicMain {
    
        public static void main(String[] argv) throws Exception {
            //创建topic
            Properties props = new Properties();
            props.put("bootstrap.servers", "192.168.80.150:9092");
            AdminClient adminClient = AdminClient.create(props);
            ArrayList<NewTopic> topics = new ArrayList<NewTopic>();
            /**
             * NewTopic(String name, int numPartitions, short replicationFactor)
             * 的构造方法来创建了一个名为“topic-test”，分区数为1，复制因子为1的Topic.
             */
            NewTopic newTopic = new NewTopic("topic-test3", 1, (short) 1);
            topics.add(newTopic);
            CreateTopicsResult result = adminClient.createTopics(topics);
            try {
                result.all().get();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
    
    }

【生产者】：ProducerMain.java

package com.caox.kafka._01_topic;
    
    import lombok.extern.slf4j.Slf4j;
    import org.apache.kafka.clients.producer.KafkaProducer;
    import org.apache.kafka.clients.producer.Producer;
    import org.apache.kafka.clients.producer.ProducerRecord;
    
    import java.util.Properties;
    
    /**
     * Created by nazi on 2018/8/27.
     * @author nazi
     */
    @Slf4j
    public class ProducerMain {
    
        public static void main(String[] argv) throws Exception {
            Properties props = new Properties();
            props.put("bootstrap.servers", "192.168.80.149:9092");
            props.put("acks", "all");
            props.put("retries", 0);
            props.put("batch.size", 16384);
            props.put("linger.ms", 1);
            props.put("buffer.memory", 33554432);
            props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
    
            Producer<String,String> producer = new KafkaProducer<String, String>(props);
            for (int i = 0; i < 100; i++){
                producer.send(new ProducerRecord<String, String>("topic-test2", Integer.toString(i), Integer.toString(i)));
            }
            log.info("call SUCCESS");
            producer.close();
        }
    
    }

【消费者】：ConsumerMain.java

package com.caox.kafka._01_topic;
    
    import lombok.extern.slf4j.Slf4j;
    import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
    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 java.util.Arrays;
    import java.util.Collection;
    import java.util.Properties;
    
    /**
     * Created by nazi on 2018/8/27.
     * @author nazi
     */
    @Slf4j
    public class ConsumerMain {
    
        public static void main(String[] argv) throws Exception {
            Properties props = new Properties();
            props.put("bootstrap.servers", "192.168.80.149:9092");
            props.put("group.id", "test");
            props.put("enable.auto.commit", "true");
            props.put("auto.commit.interval.ms", "1000");
            props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
            props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
            final KafkaConsumer<String, String> consumer = new KafkaConsumer<String,String>(props);
            consumer.subscribe(Arrays.asList("topic-test2"),new ConsumerRebalanceListener() {
                public void onPartitionsRevoked(Collection<TopicPartition> collection) {
                }
                public void onPartitionsAssigned(Collection<TopicPartition> collection) {
                    //将偏移设置到最开始
                    consumer.seekToBeginning(collection);
                }
            });
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(100);
                for (ConsumerRecord<String, String> record : records){
                    System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
                }
            }
        }
    
    }

2**.【Spring-Kafka配置程序】 ：**

**【pom.xml】依赖配置：**

<dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-context</artifactId>
    	<version>5.0.6.RELEASE</version>
    </dependency>
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-core</artifactId>
    	<version>5.0.6.RELEASE</version>
    </dependency>
    <dependency>
    	<groupId>org.springframework</groupId>
    	<artifactId>spring-beans</artifactId>
    	<version>5.0.6.RELEASE</version>
    </dependency>
    <dependency>
    	<groupId>org.springframework.kafka</groupId>
    	<artifactId>spring-kafka</artifactId>
    	<version>2.1.6.RELEASE</version>
    </dependency>

**【kafka配置】：KafkaConfig.java：**

package com.caox.kafka._02_spring_kafka;
    
    import org.apache.kafka.clients.admin.AdminClientConfig;
    import org.apache.kafka.clients.admin.NewTopic;
    import org.apache.kafka.clients.producer.ProducerConfig;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.kafka.annotation.EnableKafka;
    import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
    import org.springframework.kafka.core.*;
    
    import java.util.HashMap;
    import java.util.Map;
    
    /**
     * Created by nazi on 2018/8/28.
     * @author nazi
     */
    @Configuration
    @EnableKafka
    public class KafkaConfig {
    
        private static String BOOTSTRAP_SERVERS_CONFIG = "192.168.80.150:9092";
    
        /**
         * topic配置
         */
        /******************************************************************************************************************/
        @Bean
        public KafkaAdmin admin() {
            Map<String, Object> configs = new HashMap<String, Object>();
            configs.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG,BOOTSTRAP_SERVERS_CONFIG);
            return new KafkaAdmin(configs);
        }
    
        @Bean
        public NewTopic topic1() {
            return new NewTopic("foo", 10, (short) 1);
        }
        /******************************************************************************************************************/
    
        /**
         * 配置生产者Factory及Template
         */
        /******************************************************************************************************************/
        @Bean
        public ProducerFactory<Integer, String> producerFactory() {
            return new DefaultKafkaProducerFactory<Integer,String>(producerConfigs());
        }
        @Bean
        public Map<String, Object> producerConfigs() {
            Map<String, Object> props = new HashMap<String,Object>();
            props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS_CONFIG);
            props.put("acks", "all");
            props.put("retries", 0);
            props.put("batch.size", 16384);
            props.put("linger.ms", 1);
            props.put("buffer.memory", 33554432);
            props.put("key.serializer", "org.apache.kafka.common.serialization.IntegerSerializer");
            props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            return props;
        }
        @Bean
        public KafkaTemplate<Integer, String> kafkaTemplate() {
            return new KafkaTemplate<Integer, String>(producerFactory());
        }
        /******************************************************************************************************************/
    
        /**
         * 配置ConsumerFactory
         */
        /******************************************************************************************************************/
        @Bean
        public ConcurrentKafkaListenerContainerFactory<Integer,String> kafkaListenerContainerFactory(){
            ConcurrentKafkaListenerContainerFactory<Integer, String> factory =
                    new ConcurrentKafkaListenerContainerFactory<Integer, String>();
            factory.setConsumerFactory(consumerFactory());
            return factory;
        }
    
        @Bean
        public ConsumerFactory<Integer,String> consumerFactory(){
            return new DefaultKafkaConsumerFactory<Integer, String>(consumerConfigs());
        }
    
    
        @Bean
        public Map<String,Object> consumerConfigs(){
            HashMap<String, Object> props = new HashMap<String, Object>();
            props.put("bootstrap.servers", BOOTSTRAP_SERVERS_CONFIG);
            props.put("group.id", "test");
            props.put("enable.auto.commit", "true");
            props.put("auto.commit.interval.ms", "1000");
            props.put("key.deserializer", "org.apache.kafka.common.serialization.IntegerDeserializer");
            props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
            return props;
        }
        /******************************************************************************************************************/
    
        /**
         * 默认spring-kafka会为每一个监听方法创建一个线程来向kafka服务器拉取消息
         */
        @Bean
        public SimpleConsumerListener simpleConsumerListener(){
            return new SimpleConsumerListener();
        }
    
    }

【生产者配置】：ProducerMain.java

package com.caox.kafka._02_spring_kafka;
    
    import org.springframework.context.annotation.AnnotationConfigApplicationContext;
    import org.springframework.kafka.core.KafkaTemplate;
    import org.springframework.kafka.support.SendResult;
    import org.springframework.util.concurrent.ListenableFuture;
    import org.springframework.util.concurrent.ListenableFutureCallback;
    
    /**
     * Created by nazi on 2018/8/28.
     * @author nazi
     */
    public class ProducerMain {
    
        /**
         * 创建消息生产者
         * @param argv        参数
         * @throws Exception  异常
         */
        public static void main(String[] argv) throws Exception {
            AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(KafkaConfig.class);
            KafkaTemplate<Integer, String> kafkaTemplate = (KafkaTemplate<Integer, String>) ctx.getBean("kafkaTemplate");
            String data="this is a test message";
            ListenableFuture<SendResult<Integer, String>> send = kafkaTemplate.send("topic-test3", 1, data);
            send.addCallback(new ListenableFutureCallback<SendResult<Integer, String>>() {
                public void onFailure(Throwable throwable) {
    
                }
    
                public void onSuccess(SendResult<Integer, String> integerStringSendResult) {
                    System.out.println("success to receive message !");
                }
            });
        }
    
    }

【消费者配置】：消费者监听配置 SimpleConsumerListener.java：

package com.caox.kafka._02_spring_kafka;
    
    import org.apache.kafka.clients.consumer.ConsumerRecord;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.kafka.annotation.KafkaListener;
    
    import java.util.concurrent.CountDownLatch;
    
    /**
     * Created by nazi on 2018/8/28.
     * @author nazi
     */
    public class SimpleConsumerListener {
        private final static Logger logger = LoggerFactory.getLogger(SimpleConsumerListener.class);
        private final CountDownLatch latch1 = new CountDownLatch(1);
    
        @KafkaListener(id = "foo", topics = "topic-test3")
    //    public void listen(byte[] records) {
    //        //do something here
    //        this.latch1.countDown();
    //    }
        public void listen(ConsumerRecord record) {
            System.out.println("listen : " + " key:"+ record.key() + " value: " + record.value());
        }
    }

[http_kafka.apache.org_downloads]: http://kafka.apache.org/downloads
[70]: /images/20220515/348488aac18e4707b5272f2fe7c69081.png
[https_www.cnblogs.com_hei12138_p_7805475.html]: https://www.cnblogs.com/hei12138/p/7805475.html