kafka收发消息demo -

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kafka收发消息demo

kafka

使用原生态方式发送、接受消息

pom.xml

<dependency>
		<groupId>org.apache.kafka</groupId>
		<artifactId>kafka-clients</artifactId>
		<version>0.10.1.1</version>
	</dependency>

发消息

@Test
	public void TestProducer(){
		Properties props = new Properties();
		props.put("bootstrap.servers", "192.168.1.245:9393,192.168.1.246:9393");
        //“所有”设置将导致记录的完整提交阻塞，最慢的，但最持久的设置。
        props.put("acks", "all");
        //如果请求失败，生产者也会自动重试，即使设置成０ the producer can automatically retry.
        props.put("retries", 0);
        //The producer maintains buffers of unsent records for each partition. 
        props.put("batch.size", 16384);
        //默认立即发送，这里这是延时毫秒数
        props.put("linger.ms", 1);
        //生产者缓冲大小，当缓冲区耗尽后，额外的发送调用将被阻塞。时间超过max.block.ms将抛出TimeoutException
        props.put("buffer.memory", 33554432);
        //The key.serializer and value.serializer instruct how to turn the key and value objects the user provides with their ProducerRecord into bytes.
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        
        //创建kafka的生产者类
        // close();//Close this producer.
        // close(long timeout, TimeUnit timeUnit); //This method waits up to timeout for the producer to complete the sending of all incomplete requests.
        // flush() ;所有缓存记录被立刻发送
        Producer<String, String> producer = new KafkaProducer<String, String>(props);
        for(int i = 0; i < 10; i++){
        	
        	producer.send(new ProducerRecord<String, String>("d-topic", Integer.toString(i), Integer.toString(i)));
        }
        producer.flush();
        producer.close();
	}

收消息

@Test
	public void TestConsumer() throws InterruptedException{
		Properties props = new Properties();
		props.put("bootstrap.servers", "192.168.1.245:9393,192.168.1.246:9393");
		props.put("group.id", "GroupA");
		props.put("enable.auto.commit", "true");
		props.put("auto.commit.interval.ms", "1000");
		//从poll(拉)的回话处理时长
        props.put("session.timeout.ms", "30000");
        //poll的数量限制
        //props.put("max.poll.records", "100");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
        //订阅主题列表topic
        //consumer.subscribe(Arrays.asList("d-topic", "bar"));
        consumer.subscribe(Arrays.asList("d-topic"));
        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());
        	}
        	Thread.sleep(1000);
        }
	}

与spring集成
pom.xml

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

producer.xml

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:int="http://www.springframework.org/schema/integration"  
       xmlns:int-kafka="http://www.springframework.org/schema/integration/kafka"  
       xsi:schemaLocation="http://www.springframework.org/schema/integration/kafka  
        http://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd  
        http://www.springframework.org/schema/integration  
        http://www.springframework.org/schema/integration/spring-integration.xsd  
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd">  
  
    <!-- 生产者配置 -->  
    <bean id="template" class="org.springframework.kafka.core.KafkaTemplate">  
        <constructor-arg index="0">  
            <bean class="org.springframework.kafka.core.DefaultKafkaProducerFactory">  
                <constructor-arg>  
                    <map>  
                        <entry key="bootstrap.servers" value="192.168.1.245:9393,192.168.1.246:9393"/>  
                        <entry key="acks" value="all"/>  
                        <entry key="retries" value="3"/>  
                        <entry key="batch.size" value="16384"/>  
                        <entry key="linger.ms" value="1"/>  
                        <entry key="buffer.memory" value="33554432"/>
                        <entry key="key.serializer" value="org.apache.kafka.common.serialization.StringSerializer"></entry>  
                        <entry key="value.serializer" value="org.apache.kafka.common.serialization.StringSerializer"></entry>  
                    </map>  
                </constructor-arg>  
            </bean>  
        </constructor-arg>  
    </bean>  
  
    <!-- 生产1号 -->  
    <int:channel id="inputToKafka">
        <int:queue/>  
    </int:channel>  
    <int-kafka:outbound-channel-adapter id="kafkaOutboundChannelAdapter"  
                                        kafka-template="template"  
                                        auto-startup="true"  
                                        channel="inputToKafka"  
                                        topic="d-topic">  
        <int:poller fixed-delay="1000" time-unit="MILLISECONDS"/>  
    </int-kafka:outbound-channel-adapter>
  
</beans>

cunsumer.xml

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xmlns:int="http://www.springframework.org/schema/integration"  
       xmlns:int-kafka="http://www.springframework.org/schema/integration/kafka"  
       xsi:schemaLocation="http://www.springframework.org/schema/integration/kafka  
        http://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd  
        http://www.springframework.org/schema/integration  
        http://www.springframework.org/schema/integration/spring-integration.xsd  
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd">
        
    <!-- 消费配置 -->  
    <bean id="consumerProperties" class="java.util.HashMap">  
        <constructor-arg>  
            <map>  
                <entry key="bootstrap.servers" value="192.168.1.245:9393,192.168.1.246:9393"/>  
                <entry key="group.id" value="GroupA"/>  
                <entry key="enable.auto.commit" value="true"/>  
                <entry key="auto.commit.interval.ms" value="1000"/>  
                <entry key="session.timeout.ms" value="15000"/>  
                <entry key="key.deserializer" value="org.apache.kafka.common.serialization.StringDeserializer"/>  
                <entry key="value.deserializer" value="org.apache.kafka.common.serialization.StringDeserializer"/>  
            </map>  
        </constructor-arg>  
    </bean>
    
    <!-- 创建consumerFactory bean -->  
    <bean id="consumerFactory" class="org.springframework.kafka.core.DefaultKafkaConsumerFactory">  
        <constructor-arg>  
            <ref bean="consumerProperties"/>  
        </constructor-arg>  
    </bean>
    
    <!-- 消费1号 -->  
    <int:channel id="inputFromKafka">  
        <int:queue/>  
    </int:channel>
    
    <int-kafka:message-driven-channel-adapter auto-startup="true" channel="inputFromKafka" listener-container="container1" />  
  
    <bean id="container1" class="org.springframework.kafka.listener.KafkaMessageListenerContainer">  
        <constructor-arg index="0" ref="consumerFactory"/>  
        <constructor-arg index="1" ref="containerProperties"/>  
    </bean>  
  
    <bean id="containerProperties" class="org.springframework.kafka.listener.config.ContainerProperties">  
        <constructor-arg value="d-topic"/>  
    </bean>
   
</beans>

发送、接口消息代码

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:applicationContext.xml"})
public class TestKafka {
	
	@Autowired  
    @Qualifier("inputToKafka")  
    MessageChannel messageChannel;
	
	@Autowired  
    @Qualifier("inputFromKafka")  
    PollableChannel pollableChannel;
	
		@Test
	public void TestSpringProducer(){
		for (int i = 0; i < 15; i++) {
			Message<String> message = new GenericMessage<String>("test_" + i);
			boolean flag = messageChannel.send(message);
			System.out.println(flag + "_" + i);
		}
	}
	
	@Test
	public void TestSpringConsumer(){
		Message<?> received = pollableChannel.receive(1000);  
        while (received != null) {
            System.out.println("message########" + received);  
            received = pollableChannel.receive(1000);  
        }
	}
}

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