Java分布式学习之Kafka消息队列

 <dependencies>
        <!-- springBoot集成kafka -->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <!-- SpringBoot整合Web组件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

# kafka
spring:
  kafka:
    # kafka服务器地址(可以多个)
#    bootstrap-servers: 192.168.212.164:9092,192.168.212.167:9092,192.168.212.168:9092
    bootstrap-servers: www.kaicostudy.com:9092,www.kaicostudy.com:9093,www.kaicostudy.com:9094
    consumer:
      # 指定一个默认的组名
      group-id: kafkaGroup1
      # earliest:当各分区下有已提交的offset时，从提交的offset开始消费；无提交的offset时，从头开始消费
      # latest:当各分区下有已提交的offset时，从提交的offset开始消费；无提交的offset时，消费新产生的该分区下的数据
      # none:topic各分区都存在已提交的offset时，从offset后开始消费；只要有一个分区不存在已提交的offset，则抛出异常
      auto-offset-reset: earliest
      # key/value的反序列化
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
    producer:
      # key/value的序列化
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
      # 批量抓取
      batch-size: 65536
      # 缓存容量
      buffer-memory: 524288
      # 服务器地址
      bootstrap-servers: www.kaicostudy.com:9092,www.kaicostudy.com:9093,www.kaicostudy.com:9094

@RestController
public class KafkaController {
	/**
	 * 注入kafkaTemplate
	 */
	@Autowired
	private KafkaTemplate<String, String> kafkaTemplate;
	/**
	 * 发送消息的方法
	 *
	 * @param key
	 *            推送数据的key
	 * @param data
	 *            推送数据的data
	 */
	private void send(String key, String data) {
		// topic 名称 key   data 消息数据
		kafkaTemplate.send("kaico", key, data);
	}
	// test 主题 1 my_test 3
	@RequestMapping("/kafka")
	public String testKafka() {
		int iMax = 6;
		for (int i = 1; i < iMax; i++) {
			send("key" + i, "data" + i);
		}
		return "success";
	}
}

@Component
public class TopicKaicoConsumer {
    /**
     * 消费者使用日志打印消息
     */
    @KafkaListener(topics = "kaico") //监听的主题
    public void receive(ConsumerRecord<?, ?> consumer) {
        System.out.println("topic名称:" + consumer.topic() + ",key:" +
                consumer.key() + "," +
                "分区位置:" + consumer.partition()
                + ", 下标" + consumer.offset());
        //输出key对应的value的值
        System.out.println(consumer.value());
    }
}