Kafka安装之三 spring-kafka实践

一、spring-kafka配置详解

 1.1 要是用spring-kafka 我们首先要在pom要。xml中引入spring-kafka包

    <dependencies>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
    </dependencies>

1.2  配置文件application.properties 中对kafka进行配置

spring.kafka.bootstrap-servers=172.21.13.26:9092
spring.kafka.consumer.auto-offset-reset=latest
spring.kafka.consumer.group-id=local_test
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer

二、spring-kafka生产者源码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;

/**
 * Created by wuxiaowei on 2018/1/10 0010.
 */
@Component
public class KafkaSender {

  public KafkaSender() {
  }

  @Autowired
  private KafkaTemplate kafkaTemplate;

  public void sendMessage(String topic, String message) {

    kafkaTemplate.send(topic, message);
  }
}

三、spring-kafka消费者源码

使用监听@KafkaListener监听消息，并通过WebSocket发送消息到页面

import com.saas.mq.controller.WebSocketMessage;
import com.saas.mq.model.Body;
import com.saas.mq.model.MessageBody;
import java.io.IOException;

/**
 * Created by wuxiaowei on 2018/1/11 0011.
 */
public class SendMessage extends Thread {

  private String message;

  public SendMessage(String message) {
    this.message = message;
  }

  @Override
  public void run() {
    MessageBody messageBody = JSONObject.parseObject(this.message, MessageBody.class);

    Body body = messageBody.getResults().stream().findFirst().get();
    String resut = body.getV();
    for (WebSocketMessage item : WebSocketMessage.webSocketSet) {
      try {
        item.sendMessage("receive：" + resut);
      } catch (IOException e) {
        e.printStackTrace();
        continue;
      }
    }
  }

import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;


/**
 * Created by wuxiaowei on 2017/10/25 0025.
 */
@Component
public class KafkaConsumer {

  @KafkaListener(topics = "test")
  public void processMessage(String content) {
    SendMessage message = new SendMessage(content);
    message.start();
  }
}