RabbitMQ - 快速入门（二）

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
</dependency>

package com.imooc.order.message;
import org.springframework.cloud.stream.annotation.Input;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;
public interface StreamClient {
    String INPUT = "myMessage";
    String INPUT2 = "myMessage2";
    @Input(StreamClient.INPUT)
    SubscribableChannel input();
    @Output(StreamClient.INPUT)
    MessageChannel output();
    @Input(StreamClient.INPUT2)
    SubscribableChannel input2();
    @Output(StreamClient.INPUT2)
    MessageChannel output2();
}

package com.imooc.order.controller;
import com.imooc.order.dto.OrderDTO;
import com.imooc.order.message.StreamClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Date;
@RestController
public class SendMessageController {
    @Autowired
    private StreamClient streamClient;
//    @GetMapping("/sendMessage")
//    public void process() {
//        String message = "now " + new Date();
//        streamClient.output().send(MessageBuilder.withPayload(message).build());
//    }
    /**
     * 发送 orderDTO对象
     */
    @GetMapping("/sendMessage")
    public void process() {
        OrderDTO orderDTO = new OrderDTO();
        orderDTO.setOrderId("123456");
        streamClient.output().send(MessageBuilder.withPayload(orderDTO).build());
    }
}

package com.imooc.order.message;
import com.imooc.order.dto.OrderDTO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Component;
@Component
@EnableBinding(StreamClient.class)
@Slf4j
public class StreamReceiver {
//    @StreamListener(value = StreamClient.INPUT)
//    public void process(Object message) {
//        log.info("StreamReceiver: {}", message);
//    }
    /**
     * 接收orderDTO对象 消息
     * @param message
     */
    @StreamListener(value = StreamClient.INPUT)
    @SendTo(StreamClient.INPUT2) // 接收消息后，回复消息，或间接转发消息
    public String process(OrderDTO message) {
        log.info("StreamReceiver: {}", message);
        return "received.";
    }
    @StreamListener(value = StreamClient.INPUT2)
    public void process2(String message) {
        log.info("StreamReceiver2: {}", message);
    }
}

spring:
  cloud:
    stream:
      bindings:
        myMessage:
          group: order
          content-type: application/json