springboot整合kafka

kafka官网：http://kafka.apache.org/

一，先从官网，https://start.spring.io/，选择1.5的版本，下载到本地，在导入MyEclipse。

如图：

二，在pom.xml导入需要的jar包，完整文件如下：

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.21.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>springboot-kafka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-kafka</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- web支持 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional> <!-- 这个需要为 true 热部署才有效 -->
        </dependency>
        <!-- 部署tomcat,排除冲突 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <!-- servlet依赖 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <!-- tomcat的支持 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
    </dependencies>

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

</project>

三、安装zookeeper和kafka,并启动。

zookeeper参考：https://www.jianshu.com/p/5491d16e6abd

  进入其文件位置zookeeper-3.4.10/bin

    在终端运行 ：./zkServer.sh start

kafka参考：http://kafka.apache.org/quickstart

进入kafka文件位置后，这里是kafka_2.12-2.2.0。按以下运行

打开kafka: bin/kafka-server-start.sh config/server.properties

创建topic：bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic test

查看topic：bin/kafka-topics.sh --list --bootstrap-server localhost:9092

 

四：创建producer和consumer程序；

/**
 * 测试kafka生产者
 */
@RestController
@RequestMapping("kafka")
public class TestKafkaProducerController {

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    @RequestMapping("send")
    public String send() {
        for (int i = 0; i < 5; i++) {
            try {
                kafkaTemplate.send("test", i + "");
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return "success";
    }

}

/**
 * kafka消费者测试
 */
@Component
public class TestConsumer {

    @KafkaListener(topics = "test")
    public void listen(ConsumerRecord<?, ?> record) throws Exception {
        System.out.printf("topic = %s, offset = %d, value = %s 
", record.topic(), record.offset(), record.value());
    }
}

@SpringBootApplication
public class SpringbootKafkaApplication {

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

}

五，运行SpringbootKafkaApplication程序。

在终端运行：http://localhost:8080/kafka/send

控制台输出：

topic = test, offset = 43, value = 0 
topic = test, offset = 44, value = 1 
topic = test, offset = 45, value = 2 
topic = test, offset = 46, value = 3 
topic = test, offset = 47, value = 4