spring boot 与kafka集成

新建spring boot项目

这里使用intellij IDEA

---

添加kafka集成maven

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>

    <groupId>com.examplegroupId>
    <artifactId>demoartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <packaging>jarpackaging>

    <name>demoname>
    <description>Demo project for Spring Bootdescription>

    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>1.5.8.RELEASEversion>
        <relativePath/> 
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.kafkagroupId>
            <artifactId>spring-kafkaartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>


project>

---

项目中application.properties 添加

spring.kafka.bootstrap-servers=vm208:9092,vm:9092,vm50:9092
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
spring.kafka.producer.acks=1

新建KafkaConsumer消费类

package com.example.demo.consumer;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

@Component
public class KafkaConsumer {

    private Logger logger = LoggerFactory.getLogger(this.getClass());

    @KafkaListener(topics = {"test"})
    public void listen(ConsumerRecord record) {
        System.out.printf("offset = %d,key =%s,value=%s\n", record.offset(), record.key(), record.value());
    }

}

启动spring-boot程序,在kafka集群,模拟发送topic,检验接收

bin/kafka-console-producer.sh --broker-list    vm208:9092,vm210:9092,vm50:9092  --topic  test

---

编写producer代码

package com.example.demo.producer;


import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;

@Component
public class KafkaProducer {

    @Autowired
    private KafkaTemplate kafkaTemplate;

    String topic="test";
    public void sendMessage(String key,String data){
        kafkaTemplate.send(new ProducerRecord(topic,key,data));
    }
}

建立一个restful模拟发送( //http://localhost:8080/kafka/send.do?key=2&data=allen-test-message)

package com.example.demo.controller;


import com.example.demo.producer.KafkaProducer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ProducerController {

    @Autowired
    private KafkaProducer kafkaProducer;

    @RequestMapping(value = "/kafka/send.do", method = RequestMethod.GET)
    public String sendMessage(@RequestParam(value = "key") String key, @RequestParam(value = "data") String data) {
        kafkaProducer.sendMessage(key, data);
        return "sucess";
    }
}

---

可以发现 spring-kafka大大减少了代码工作量.

官方文档:
https://docs.spring.io/spring-kafka/docs/1.2.2.RELEASE/reference/html/