Spring boot + Kafka简单例子

Kafka服务器

参考另一个文章

新建Spring boot application

File-New-Spring boot-Spring starter project

spring boot 启动类KafkaProduerConsumerApplication.java

package com.springboot.kafka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class KafkaProduerConsumerApplication {

	public static void main(String[] args) {
		SpringApplication.run(KafkaProduerConsumerApplication.class, args);
	}

}

一个Controller类 KafkaController

package com.springboot.kafka.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.springboot.kafka.service.Producer;

@RestController
@RequestMapping("/kafka")
public class KafkaController {

    @Autowired
    private Producer producer;

    @PostMapping("/post")
    public void sendMessage(@RequestParam("msg") String msg) {
        producer.publishToTopic(msg);
    }

}

两个service类，一个Kafka的message producer, 一个kafka的message consumer。

package com.springboot.kafka.service;

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

@Service
public class Producer {

    private static final String topic = "mytopic";

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public void publishToTopic(String message) {
        System.out.println("publish to topic " + topic);
        this.kafkaTemplate.send(topic, message);
    }

}

package com.springboot.kafka.service;

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

@Service
public class Consumer {

    @KafkaListener(topics = "mytopic", groupId = "mygroup")
    public void consumerFromTopic(String message) {
        System.out.println(message);
    }

}

配置application.yml, 主要是kafka的参数。

server: 
  port: 8666

spring:
   kafka:
     consumer:
        bootstrap-servers: 192.168.1.105:9092
        group-id: mygroup
        auto-offset-reset: earliest
        key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
        value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
     producer:
        bootstrap-servers: 192.168.1.105:9092
        key-serializer: org.apache.kafka.common.serialization.StringSerializer
        value-serializer: org.apache.kafka.common.serialization.StringSerializer

测试

启动192.168.1.105:9092的Kafka服务器

启动spring boot application.

用Postman发送post请求

URL: http://127.0.0.1:8666/kafka/post Param：msg = hello kafka

在console上打印msg信息。