系统环境

使用远程服务器上搭建的kafka服务

Ubuntu 16.04 LTS kafka_2.12-0.11.0.0.tgz zookeeper-3.5.2-alpha.tar.gz

集成过程

1.创建spring boot工程，添加相关依赖：

<?xml version="1.0" encoding="UTF-8"?>
<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>com.laravelshao.springboot</groupId>
    <artifactId>spring-boot-integration-kafka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-integration-kafka</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--kafka-->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-json</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2.添加配置信息，这里使用yml文件

spring:
  kafka:
    bootstrap-servers:X.X.X.X:9092
    producer:
      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
    consumer:
      group-id: test
      auto-offset-reset: earliest
      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
      properties:
        spring:
          json:
            trusted:
              packages: com.laravelshao.springboot.kafka

3.创建消息对象

public class Message {
    private Integer id;
    private String msg;

    public Message() {
    }

    public Message(Integer id, String msg) {
        this.id = id;
        this.msg = msg;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    @Override
    public String toString() {
        return "Message{" +
                "id=" + id +
                ", msg='" + msg + '\'' +
                '}';
    }
}

4.创建生产者

package com.laravelshao.springboot.kafka;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Component;

/**
 * Created by shaoqinghua on 2018/3/23.
 */
@Component
public class Producer {
    private static Logger log = LoggerFactory.getLogger(Producer.class);

    @Autowired
    private KafkaTemplate kafkaTemplate;

    public void send(String topic, Message message) {
        kafkaTemplate.send(topic, message);
        log.info("Producer->topic:{}, message:{}", topic, message);
    }

}

5.创建消费者，使用@ KafkaListener注解监听主题

package com.laravelshao.springboot.kafka;

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;

/**
 * Created by shaoqinghua on 2018/3/23.
 */
@Component
public class Consumer {
    private static Logger log = LoggerFactory.getLogger(Consumer.class);

    @KafkaListener(topics = "test_topic")
    public void receive(ConsumerRecord<String, Message> consumerRecord) {
        log.info("Consumer->topic:{}, value:{}", consumerRecord.topic(), consumerRecord.value());
    }

}

6.发送消费测试

package com.laravelshao.springboot;

import com.laravelshao.springboot.kafka.Message;
import com.laravelshao.springboot.kafka.Producer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;

@SpringBootApplication
public class IntegrationKafkaApplication {

    public static void main(String[] args) throws InterruptedException {
        ApplicationContext context = SpringApplication.run(IntegrationKafkaApplication.class, args);
        Producer producer = context.getBean(Producer.class);

        for (int i = 1; i < 10; i++) {
            producer.send("test_topic", new Message(i, "test topic message " + i));
            Thread.sleep(2000);
        }
    }

}

可以依次看到发送消息，消费消息

异常问题

反序列化异常(自定义的消息对象不在kafka信任的包路径下)？

[org.springframework.kafka.KafkaListenerEndpointContainer#0-0-C-1] ERROR org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.719 Container exception
org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition test_topic-0 at offset 9. If needed, please seek past the record to continue consumption.
Caused by: java.lang.IllegalArgumentException: The class 'com.laravelshao.springboot.kafka.Message' is not in the trusted packages: [java.util, java.lang]. If you believe this class is safe to deserialize, please provide its name. If the serialization is only done by a trusted source, you can also enable trust all (*).
	at org.springframework.kafka.support.converter.DefaultJackson2JavaTypeMapper.getClassIdType(DefaultJackson2JavaTypeMapper.java:139)
	at org.springframework.kafka.support.converter.DefaultJackson2JavaTypeMapper.toJavaType(DefaultJackson2JavaTypeMapper.java:113)
	at org.springframework.kafka.support.serializer.JsonDeserializer.deserialize(JsonDeserializer.java:191)
	at org.apache.kafka.clients.consumer.internals.Fetcher.parseRecord(Fetcher.java:923)
	at org.apache.kafka.clients.consumer.internals.Fetcher.access$2600(Fetcher.java:93)
	at org.apache.kafka.clients.consumer.internals.Fetcher$PartitionRecords.fetchRecords(Fetcher.java:1100)
	at org.apache.kafka.clients.consumer.internals.Fetcher$PartitionRecords.access$1200(Fetcher.java:949)
	at org.apache.kafka.clients.consumer.internals.Fetcher.fetchRecords(Fetcher.java:570)
	at org.apache.kafka.clients.consumer.internals.Fetcher.fetchedRecords(Fetcher.java:531)
	at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1146)
	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1103)
	at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:667)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:745)

解决方法：将当前包添加到kafka信任的包路径下

spring:
  kafka:
    consumer:
      properties:
        spring:
          json:
            trusted:
              packages: com.laravelshao.springboot.kafka