前言
最近应用 helm3 装置好了 kafka 和 rabbitmq,并且想集成到 spring 中,发现集成不是那么简略的,尽管有官网实例,然而实例下面短少必要的代码所以通过本人摸索一步步实现,分享给大家。
操作
首先,装置好 kafka 装置和 rabbitmq 装置环境,装置好之后,咱们就能够配置 spring 了。
1、首先引入相干依赖包:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-binder-rabbit</artifactId>
</dependency>
2、配置 application.yml 文件
上面是我的配置,如下所示:
spring:
cloud:
stream:
function:
definition: testKafkaOut;testKafkaIn;testRabbitOut;testRabbitIn
bindings:
testKafkaOut-out-0:
binder: kafka-binder
destination: test
#设置音讯类型,本次为 json,文本则设置 "text/plain"
content-type: application/json
testKafkaIn-in-0:
binder: kafka-binder
destination: test
content-type: application/json
group: log_group
testRabbitOut-out-0:
binder: rabbit-binder
destination: dev
content-type: application/json
testRabbitIn-in-0:
binder: rabbit-binder
destination: dev
content-type: application/json
group: dev-group
binders:
kafka-binder:
type: kafka
environment:
spring:
cloud:
stream:
kafka:
binder:
brokers: xxx.xxx.xxx.xxx:xxxx
auto-create-topics: true
rabbit-binder:
type: rabbit # 音讯组件类型
environment: # 设置 rabbitmq 的相干的环境配置
spring:
rabbitmq:
host: xxx.xxx.xxx.xxx
port: xxxx
username: user
password: password
virtual-host: dev
这样就实现了 spring cloud stream
和kafka
以及 rabbitmq
的配置。
3、收发音讯
新建一个 java 类进行收发音讯操作,如下所示:
import org.springframework.context.annotation.Bean;
import org.springframework.messaging.Message;
import org.springframework.stereotype.Component;
import java.util.function.Consumer;
import java.util.function.Supplier;
@Component
public class MessageProcessor {
@Bean
public Supplier<Message<String>> testKafkaOut() {return () -> MessageBuilder.withPayload("Hello from Kafka!").build();}
@Bean
public Consumer<Message<String>> testKafkaIn() {return message -> System.out.println("Received from Kafka:" + message.getPayload());
}
@Bean
public Supplier<Message<String>> testRabbitOut() {return () -> MessageBuilder.withPayload("Hello from RabbitMQ!").build();}
@Bean
public Consumer<Message<String>> testRabbitIn() {return message -> System.out.println("Received from RabbitMQ:" + message.getPayload());
}
}
或者应用上面简略的写法:
发消息:
@Autowired
private StreamBridge streamBridge;
...
streamBridge.send("testRabbitOut-out-0", "hello rabbitmq");
streamBridge.send("testKafkaOut-out-0", "hello kafka");
...
收音讯:
@Component
public class ConsumersHandler {
@Bean
public Consumer<String> testKafkaIn(){
return str -> {System.out.println("Success Rescive message from kafka:" + str);
};
}
@Bean
public Consumer<String> testRabbitIn() {
return str -> {System.out.println("Success Rescive message from rabbitmq:" + str);
};
}
}
两种写法都能够,就看你本人的抉择了,上面是收到音讯的打印后果:
Success Rescive message from rabbitmq: hello rabbitmq
Success Rescive message from kafka: hello kafka
总结
1、配置 application.yml 文件的时候要留神 function.definition
的写法,如下所示:
function:
definition: testKafkaOut;testKafkaIn;testRabbitOut;testRabbitIn
而我一开始写成了:
testKafkaOut,testKafkaIn,testRabbitOut,testRabbitIn
导致报错:
kafka-binder,rabbit-binder, and no default binder has been set.
别小看这个问题,因为我的大意花了一周才解决,唉!
2、同样是 application.yml 中的配置 default-binder
能够不必设置,因为咱们在每个 bindings 中曾经指定了 binder 了
3、上面的写法,应用程序启动之后报:rabbitmq binder 是找不到
,所以应用了localhost:5672
,如下所示:
spring:
cloud:
stream:
kafka:
binder:
auto-create-topics: true
brokers: xxx.xxx.xxx.xxx:xxxx
rabbit:
binder:
host: xxx.xxx.xxx.xxx
port: xxxx
username: user
password: password
virtual-host: dev
这个写法有问题,所以举荐我下面的 binders
写法。
4、我开始借助了 chatgpt3.5,它有时候给的代码都是 spring cloud strem 3.1
之前的,于是我应用了 4.0 之后给出的代码是最新的,大家能够试试 chatgpt4,这里有个举荐的地址
援用
Spring Cloud Stream 函数式编程整合 kafka/rabbit
spring-cloud-stream-samples
Spring Cloud Stream 整合 Kafka
Spring Cloud Stream Rabbit 3.1.3 入门实际