springboot kafka生产者

pom文件：

<?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>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>kafka_demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>kafka_demo</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-web</artifactId>
        </dependency>

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

        <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>2.2.0</version>
        </dependency>

    </dependencies>

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

</project>

第一种： 常见的生产者：

package com.example.kafka_demo;
import org.apache.kafka.clients.producer.*;
import java.util.Properties;

public class Demo {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.8.20:9092");
        props.put("acks", "0");
        props.put("retries", 0);
//        props.put("batch.size", 16384);
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        Producer producer = new KafkaProducer(props);
        //正常发送消息的producer
//        ProducerRecord<String, String> record = new ProducerRecord<>("first", "333");
        //带key的producer
//        ProducerRecord<String, String> record = new ProducerRecord<>("first","key", "3312333");
        //指定分区的producer
        ProducerRecord<String, String> record = new ProducerRecord<>("first",0,"key", "lover");
        producer.send(record);
        producer.close();
    }
}

第二种： 生产者带回调函数

package com.example.kafka_demo;

import org.apache.kafka.clients.producer.*;

import java.util.Properties;

public class Demo {

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.8.20:9092");
        props.put("acks", "1");
        props.put("retries", 0);
//        props.put("batch.size", 16384);
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        Producer producer = new KafkaProducer(props);
        ProducerRecord<String, String> record = new ProducerRecord<>("first", 0, "123", "haasdf");
        producer.send(record, (metadata, e) -> {
            if (e != null) {
                e.printStackTrace();
            }
            System.out.println("success:"+ metadata);
        });
        producer.close();
    }
}