stream的作用：

引入依赖

   <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-stream-binder-kafka</artifactId>
        </dependency>

添加配置项

server.port=20001
spring.application.name=sys-tool-kafka-stream
kafka.topic=test
spring.kafka.bootstrap-servers=localhost:9092
spring.cloud.stream.bindings.output.destination=${kafka.topic}
spring.cloud.stream.bindings.input.destination=${kafka.topic}

功能测试

生产者bean

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.messaging.Source;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.MessageBuilder;


@EnableBinding(Source.class)
public class MessageProducerBean {
    @Autowired
    @Qualifier(Source.OUTPUT)
    private MessageChannel messageChannel;
    public void send(String message){
        final boolean send = messageChannel.send(MessageBuilder.withPayload(message).build());
    }
}

消费者bean

package com.tool.stream.kafka.stream.consumer;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.cloud.stream.messaging.Sink;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;
import org.springframework.messaging.SubscribableChannel;

import javax.annotation.PostConstruct;

@EnableBinding(Sink.class)
public class MessageConsumerBean {
    @Autowired
    @Qualifier(Sink.INPUT)
    private SubscribableChannel subscribableChannel;
    @Autowired
    private Sink sink;

    //当bean注入完成后调用,以下三中方式用一种即可
    //第一种方式
    @PostConstruct
    public void init() {
        subscribableChannel.subscribe(new MessageHandler() {
            @Override
            public void handleMessage(Message<?> message) throws MessagingException {
                Object payload = message.getPayload();
                System.out.println(new String((byte[]) payload));
            }
        });

    }
    //第二种方式
    @ServiceActivator(inputChannel = Sink.INPUT)
    public void onMessage(Object message) {
        System.out.println("@ServiceActivator-->" +message);

    }
    //第三种方式
    @StreamListener(Sink.INPUT)
    public void onMessage(String message) {
        System.out.println("@StreamListener-->" + message);

    }

}

消息测试

注意这些和kafka有关，所以应该先开启kafka

package com.tool.stream.kafka;

import com.tool.stream.kafka.stream.producer.MessageProducerBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RequestMapping("kafkastream")
@RestController
public class SysToolKafkaStreamApplication {
    @Autowired
    private MessageProducerBean messageProducerBean;
    @RequestMapping("test")
    public String send(String msg){
        messageProducerBean.send(msg);
        return "success";
    }

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

}