Spring-Boot集成Kafka

这篇文章不讲Kafka相关概念，只是实战。具体了解请参考：

《分布式消息中间件实践》

《Kafka权威指南》

《spring-kafka-reference》spring集成kafka官方文档。

以为SpringBoot集成Kafka

pom.xml

<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>4.0.0</modelVersion>

    <groupId>org.niugang</groupId>
    <artifactId>kafka-spring-boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <!-- 继承父包 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath></relativePath>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            </dependency>
    </dependencies>
    <!--maven的插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

application.properties

server.port=8086
###########################################kafka about config #######################################################
spring.kafka.bootstrap-servers=localhost:9092
##########################producer about config##############################
spring.kafka.producer.acks=1
spring.kafka.producer.batch-size=16384
spring.kafka.producer.retries=0
spring.kafka.producer.buffer-memory=33554432
#spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer.class
#spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer.class
##########################consumer about config##############################
spring.kafka.consumer.enable-auto-commit=true
spring.kafka.consumer.group-id=kafka_group_2
spring.kafka.consumer.auto-commit-interval=100
#spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer.class
#spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer.class

发送消息

package com.niugang.controller;

import java.util.concurrent.ExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.support.SendResult;
import org.springframework.util.concurrent.ListenableFuture;
import org.springframework.util.concurrent.ListenableFutureCallback;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * 
 * @ClassName:  SenderConttoller   
 * @Description:验证发送消息
 * @author: niugang
 * @date:   2018年11月3日 上午9:58:19   
 * @Copyright: 863263957@qq.com. All rights reserved. 
 *
 */
@RestController
public class SenderConttoller {
    private Logger logger = LoggerFactory.getLogger(SenderConttoller.class);

    @Autowired
    private KafkaTemplate<String, String> template;

    /**
     * 同步发送
     * 
     * @return
     * @throws ExecutionException
     * @throws InterruptedException
     */
    @RequestMapping("syncSendMessage")
    public String syncSendMessage() {
        for (int i = 0; i < 100; i++) {
            try {
                template.send("kafka-boot", "0", "foo" + i).get();
            } catch (InterruptedException e) {
                logger.error("sync send message fail [{}]", e.getMessage()); 
                e.printStackTrace();
            } catch (ExecutionException e) {
                logger.error("sync send message fail [{}]", e.getMessage());
                e.printStackTrace();
            }
        }
        return "success";
    }

    /**
     * 异步发送
     * 
     * @return
     */
    @RequestMapping("asyncSendMessage")
    public String sendMessageAsync() {
        for (int i = 0; i < 100; i++) {
            /**
             * <p>
             * SendResult:如果消息成功写入kafka就会返回一个RecordMetaData对象;result.
             * getRecordMetadata() 他包含主题信息和分区信息，以及集成在分区里的偏移量。
             * 查看RecordMetaData属性字段就知道了
             * </p>
             *
             */
            ListenableFuture<SendResult<String, String>> send = template.send("kafka-boot", "0", "foo" + i);
            send.addCallback(new ListenableFutureCallback<SendResult<String, String>>() {

                @Override
                public void onSuccess(SendResult<String, String> result) {
                    logger.info("async send message success partition [{}]", result.getRecordMetadata().partition());
                    logger.info("async send message success offest[{}]", result.getRecordMetadata().offset());
                }

                @Override
                public void onFailure(Throwable ex) {
                    logger.error("async send message fail [{}]", ex.getMessage());

                }
            });
        }
        return "success";
    }
}

消费者

package com.niugang.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;


/**
 * 
 * @ClassName: ConsumerListener
 * @Description:消费者监听
 * @author: niugang
 * @date: 2018年10月21日 下午2:05:21
 * @Copyright: 863263957@qq.com. All rights reserved.
 *
 */
@Component
public class ConsumerListener {
    private Logger logger = LoggerFactory.getLogger(ConsumerListener.class);

    @KafkaListener(id = "foo", topics = "kafka-boot")
    public void listen1(String foo) {
        logger.info("message content [{}]", foo);
    }
}

启动类

package com.niugang;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.support.SpringBootServletInitializer;


/**
 * 
 * @ClassName:  KafkaApplication   
 * @Description：启动类  
 * @author: niugang
 * @date:   2018年10月20日 下午7:55:38   
 * @Copyright: 863263957@qq.com. All rights reserved. 
 *
 */
@SpringBootApplication
public class KafkaApplication extends SpringBootServletInitializer {

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

}

源码：https://gitee.com/niugangxy/kafka/tree/master/kafka-spring-boot

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