Java-RabbitMq-回退

1.修改application.properties，新增spring.rabbitmq.publisher-returns=true

# 应用名称
spring.application.name=demo
spring.rabbitmq.host=127.0.0.1
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.publisher-/confirm/i-type=correlated
spring.rabbitmq.publisher-returns=true

2.消息生产者代码

import com.rabbitmq.demo.config.MyCallBack;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;

import javax.annotation.PostConstruct;
import java.util.UUID;


@Slf4j
@Component
public class MessageProducer implements RabbitTemplate./confirm/iCallback , RabbitTemplate.ReturnCallback {
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private MyCallBack myCallBack;

    //rabbitTemplate 注入之后就设置该值
    @PostConstruct
    private void init() {
        rabbitTemplate.set/confirm/iCallback(myCallBack);
        
        rabbitTemplate.setMandatory(true);
        //设置回退消息交给谁处理
        rabbitTemplate.setReturnCallback(this);
    }
    @GetMapping("sendMessage")
    public void sendMessage(String message){
        //让消息绑定一个 id 值
        CorrelationData correlationData1 = new CorrelationData(UUID.randomUUID().toString());

        rabbitTemplate.convertAndSend("/confirm/i.exchange","key1",message+"key1",correlationData1)
        ;
        log.info("发送消息 id 为:{}内容为{}",correlationData1.getId(),message+"key1");
        CorrelationData correlationData2 = new CorrelationData(UUID.randomUUID().toString());

        rabbitTemplate.convertAndSend("/confirm/i.exchange","key2",message+"key2",correlationData2)
        ;
        log.info("发送消息 id 为:{}内容为{}",correlationData2.getId(),message+"key2");
    }
    @Override
    public void /confirm/i(CorrelationData correlationData, boolean ack, String cause) {
        String id = correlationData != null ? correlationData.getId() : "";
        if (ack) {
            log.info("交换机收到消息确认成功, id:{}", id);
        } else {
            log.error("消息 id:{}未成功投递到交换机,原因是:{}", id, cause);
        }
    }
    @Override
    public void returnedMessage(Message message, int replyCode, String replyText, String
            exchange, String routingKey) {
        log.info("消息:{}被服务器退回，退回原因:{}, 交换机是:{}, 路由 key:{}",
                new String(message.getBody()),replyText, exchange, routingKey);
    }
}

3.回退接口

    //当消息无法路由的时候的回调方法
    @Override
    public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) {
        log.error(" 消 息 {}, 被交换机 {} 退回，退回原因 :{}, 路 由 key:{}",new
                String(message.getBody()),exchange,replyText,routingKey);
    }

链接: https://gitee.com/yffffy/springboot-rabbitmq2