在springboot中对kafka进行读写操作
时间:2022-07-22
本文章向大家介绍在springboot中对kafka进行读写操作,主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。
springboot对kafka的client很好的实现了集成,使用非常方便,本文也实现了一个在springboot中实现操作kafka的demo。
1.POM配置
只需要在dependencies中增加 spring-kafka的配置即可。完整效果如下:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
<spring-kafka.version>1.2.2.RELEASE</spring-kafka.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</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</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<!-- spring-kafka -->
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>${spring-kafka.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<version>${spring-kafka.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
2.生产者
参数配置类,其参数卸载yml文件中,通过@Value注入
package com.dhb.kafka.producer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;
import java.util.HashMap;
import java.util.Map;
@Configuration
public class SenderConfig {
@Value("${kafka.bootstrap-servers}")
private String bootstrapServers;
@Bean
public Map<String,Object> producerConfigs() {
Map<String,Object> props = new HashMap<>();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,this.bootstrapServers);
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class);
props.put(ProducerConfig.ACKS_CONFIG,"0");
return props;
}
@Bean
public ProducerFactory<String,String> producerFactory() {
return new DefaultKafkaProducerFactory<>(producerConfigs());
}
@Bean
public KafkaTemplate<String,String> kafkaTemplate() {
return new KafkaTemplate<String, String>(producerFactory());
}
@Bean
public Sender sender() {
return new Sender();
}
}
消息发送类
package com.dhb.kafka.producer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
@Slf4j
public class Sender {
@Autowired
private KafkaTemplate<String,String> kafkaTemplate;
public void send(String topic,String payload) {
log.info("sending payload='{}' to topic='{}'",payload,topic);
this.kafkaTemplate.send(topic,payload);
}
}
3.消费者
参数配置类
package com.dhb.kafka.consumer;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import java.util.HashMap;
import java.util.Map;
@Configuration
@EnableKafka
public class ReceiverConfig {
@Value("${kafka.bootstrap-servers}")
private String bootstrapServers;
public Map<String,Object> consumerConfigs() {
Map<String,Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG,"helloword");
return props;
}
@Bean
public ConsumerFactory<String,String> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs());
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String,String> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String,String> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
@Bean
public Receiver receiver() {
return new Receiver();
}
}
消息接受类
package com.dhb.kafka.consumer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.kafka.annotation.KafkaListener;
import java.util.concurrent.CountDownLatch;
@Slf4j
public class Receiver {
private CountDownLatch latch = new CountDownLatch(1);
public CountDownLatch getLatch() {
return latch;
}
@KafkaListener(topics = "${kafka.topic.helloworld}")
public void receive(String payload) {
log.info("received payload='{}'",payload);
latch.countDown();
}
}
4.web测试类
定义了一个基于http的web测试接口
package com.dhb.kafka.web;
import com.dhb.kafka.producer.Sender;
import lombok.extern.slf4j.Slf4j;
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.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@RestController
@Slf4j
public class KafkaProducer {
@Autowired
Sender sender;
@RequestMapping(value = "/sender.action", method = RequestMethod.POST)
public void exec(HttpServletRequest request, HttpServletResponse response,String data) throws IOException{
this.sender.send("testtopic",data);
response.setCharacterEncoding("UTF-8");
response.setContentType("text/json");
response.getWriter().write("success");
response.getWriter().flush();
response.getWriter().close();
}
}
#4.启动类及配置
package com.dhb.kafka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class KafkaApplication {
public static void main(String[] args) { SpringApplication.run(KafkaApplication.class,args);
}
}
application.yml
kafka:
bootstrap-servers: 192.168.162.239:9092
topic:
helloworld: testtopic
程序结构:
5.读写测试
通过执行KafkaApplication的main方法启动程序。然后打开postman进行测试:
运行后返回success
生产者日志:
消费者日志:
- Mysql连接错误:Lost connection to Mysql server at 'waiting for initial communication packet'
- 适应现代变化的数据架构
- Linux下修改系统编码的操作记录
- 微信公众平
- linq to xml复习
- web cache server方案比较:varnish、squid、nginx
- Nginx虚拟目录alias和root目录
- Nginx的https配置记录以及http强制跳转到https的方法梳理
- VPC下访问FTP的问题
- 分析车辆雨刮频次计算降雨量 大数据服务天气预报
- 干货:这里有一份小程序接入微信支付避雷指南
- Mysql占用过高CPU时的优化手段
- 服务器端加入自动运行的JS代码
- 数据中心发电机组的调试与验收要求
- java教程
- Java快速入门
- Java 开发环境配置
- Java基本语法
- Java 对象和类
- Java 基本数据类型
- Java 变量类型
- Java 修饰符
- Java 运算符
- Java 循环结构
- Java 分支结构
- Java Number类
- Java Character类
- Java String类
- Java StringBuffer和StringBuilder类
- Java 数组
- Java 日期时间
- Java 正则表达式
- Java 方法
- Java 流(Stream)、文件(File)和IO
- Java 异常处理
- Java 继承
- Java 重写(Override)与重载(Overload)
- Java 多态
- Java 抽象类
- Java 封装
- Java 接口
- Java 包(package)
- Java 数据结构
- Java 集合框架
- Java 泛型
- Java 序列化
- Java 网络编程
- Java 发送邮件
- Java 多线程编程
- Java Applet基础
- Java 文档注释
- rxjs里concatMap operators的用法
- rxjs里takeWhile operators的用法
- Python sql注入 过滤字符串的非法字符实例
- rxjs里combineLatest operators的用法
- rxjs里withLatestFrom operators的用法
- rxjs里distinctUntilChanged operators的用法
- pycharm安装及如何导入numpy
- rxjs里debounceTime operators的用法
- rxjs里delay operators的用法
- Android使用FontMetrics对象计算位置坐标
- rxjs里scan和mergeScan operators的用法
- Android自定义控件的步骤
- Android通过Socket与服务器之间进行通信的示例
- SAP Spartacus central configuration - B2cStorefrontModule
- Android自定义控件实现折线图