SpringBoot整合RabbitMq后实现消息传输

今天通过学习mall商城的订单下单之后如果未进行付款之后，到达一定时间后将产生的进行取消。跟着学习，也跟着写个demo。记录一下。

编写之前要保证自己的电脑已经安装了erlang和rabbitMq。并且能正常启动。如果不了解前面过程，可以先点击mall商城后观看一遍，进行编写。

添加maven依赖

<dependency>
<groupId>org.springframework.amqp</groupId>
<artifactId>spring-amqp</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.amqp</groupId>
<artifactId>spring-rabbit</artifactId>
</dependency>

添加yml文件

spring:
rabbitmq:
host: localhost # rabbitmq的连接地址
port: 5672 # rabbitmq的连接端口号
virtual-host: /mall # rabbitmq的虚拟host
username: mall # rabbitmq的用户名
password: mall # rabbitmq的密码
publisher-confirms: true #如果对异步消息需要回调必须设置为true

编写枚举类，规范代码

package cn.zxw.bean.result;

import lombok.Data;
import lombok.Getter;

/**
* @author zxw
* @version 1.0
* @description 消息队列
* @data: 2020/2/25 16:34
*/
@Getter
public enum QueueEnum {

/**
* 消息通知队列
*/
QUEUE_ORDER_CANCEL("mall.order.direct", "mall.order.cancel", "mall.order.cancel"),

/**
* 消息通知ttl队列
*/
QUEUE_TTL_ORDER_CANCEL("mall.order.direct.ttl", "mall.order.cancel.ttl", "mall.order.cancel.ttl");

/**
* 交换名称
*/
private String exchange;

/**
* 队列名称
*/
private String name;

/**
* 路由键
*/
private String routeKey;

QueueEnum(String exchange, String name, String routeKey) {
this.exchange = exchange;
this.name = name;
this.routeKey = routeKey;
}
}

编写配置类，绑定队列和交换机

package cn.zxw.config;

import cn.zxw.bean.result.QueueEnum;
import org.springframework.amqp.core.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
* @author zxw
* @version 1.0
* @description mq配置
* @data: 2020/2/25 17:09
*/
@Configuration
public class RabbitMqConfig {

/**
* 订单消息实际消费队列所绑定的交换机
*/
@Bean
DirectExchange orderDirect() {
return (DirectExchange) ExchangeBuilder
.directExchange(QueueEnum.QUEUE_ORDER_CANCEL.getExchange())
.durable(true)
.build();
}

/**
* 订单延迟队列绑定的交换机
* @return
*/
@Bean
DirectExchange orderTtlDirect(){
return (DirectExchange) ExchangeBuilder
.directExchange(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange())
.durable(true)
.build();
}

/**
* 订单实际消费队列
* @return
*/
@Bean
public Queue orderQueue(){
return new Queue(QueueEnum.QUEUE_ORDER_CANCEL.getName());
}

/**
* 订单延迟队列（死信队列）
*/
@Bean
public Queue orderTtlQueue() {
return QueueBuilder
.durable(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getName())
//到期后转发的交换机
.withArgument("x-dead-letter-exchange", QueueEnum.QUEUE_ORDER_CANCEL.getExchange())
//到期后转发的路由键
.withArgument("x-dead-letter-routing-key", QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey())
.build();
}

/**
* 将订单队列绑定到交换机
*/
@Bean
public Binding orderBinding(DirectExchange orderDirect, Queue orderQueue){
return BindingBuilder
.bind(orderQueue)
.to(orderDirect)
.with(QueueEnum.QUEUE_ORDER_CANCEL.getRouteKey());
}

/**
* 将订单延迟队列绑定到交换机
*/
@Bean
public Binding orderTtlBinding(DirectExchange orderTtlDirect,Queue orderTtlQueue){
return BindingBuilder
.bind(orderTtlQueue)
.to(orderTtlDirect)
.with(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey());
}
}

编写消息的生产者

package cn.zxw.util;

import cn.zxw.bean.result.QueueEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
* @author zxw
* @version 1.0
* @description 取消订单消息的发出者(生产者)
* @data: 2020/2/25 17:41
*/
@Component
public class CancelOrderSender {
private static Logger LOGGER = LoggerFactory.getLogger(CancelOrderSender.class);

@Autowired
private AmqpTemplate amqpTemplate;

/**
* 发送消息给ma
* @param orderId 订单号
* @param delayTimes 超时时间
*/
public void sendMessage(Long orderId, final long delayTimes) {
//给延迟队列发送消息
amqpTemplate.convertAndSend(QueueEnum.QUEUE_TTL_ORDER_CANCEL.getExchange(), QueueEnum.QUEUE_TTL_ORDER_CANCEL.getRouteKey(), orderId, new MessagePostProcessor() {
@Override
public Message postProcessMessage(Message message) throws AmqpException {
//给消息设置延迟毫秒值
message.getMessageProperties().setExpiration(String.valueOf(delayTimes));
return message;
}
});
LOGGER.info("send delay message orderId:{}", orderId);
}
}

编写消息的消费者

package cn.zxw.util;

import cn.zxw.service.OmsPortalOrderService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
* @author zxw
* @version 1.0
* @description 取消订单的接收者（消费者）
* @data: 2020/2/25 17:47
*/
@Component
@RabbitListener(queues = "mall.order.cancel")
public class CancelOrderReceiver {

private static Logger LOGGER = LoggerFactory.getLogger(CancelOrderReceiver.class);
@Autowired
private OmsPortalOrderService portalOrderService;

@RabbitHandler
public void handle(Long orderId){
LOGGER.info("receive delay message orderId:{}",orderId);
portalOrderService.cancelOrder(orderId);
}
}

编写订单service

package cn.zxw.service;

import cn.zxw.bean.OrderParam;
import cn.zxw.bean.result.CommonResult;
import org.springframework.transaction.annotation.Transactional;

/**
* @author zxw
* @version 1.0
* @description 前台订单处理的service
* @data: 2020/2/25 17:52
*/
public interface OmsPortalOrderService {

/**
* 根据提交信息生成订单
* @param orderParam 订单参数
*/
@Transactional(rollbackFor = Exception.class)
CommonResult generateOrder(OrderParam orderParam);

/**
* 取消单个超时订单
* @param orderId 订单号
*/
@Transactional(rollbackFor = Exception.class)
void cancelOrder(Long orderId);
}

编写订单的测试类

package cn.zxw.service.impl;

import cn.zxw.bean.OrderParam;
import cn.zxw.bean.result.CommonResult;
import cn.zxw.service.OmsPortalOrderService;
import cn.zxw.util.CancelOrderSender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
* @author zxw
* @version 1.0
* @description 前台订单服务的实现类
* @data: 2020/2/25 17:55
*/
@Service
public class OmsPortalOrderServiceImpl implements OmsPortalOrderService {

private static Logger LOGGER = LoggerFactory.getLogger(OmsPortalOrderServiceImpl.class);
@Autowired
private CancelOrderSender cancelOrderSender;

@Override
public CommonResult generateOrder(OrderParam orderParam) {
//todo 执行一系类下单操作
LOGGER.info("process generateOrder");
//下单完成后开启一个延迟消息，用于当用户没有付款时取消订单（orderId应该在下单后生成）
sendDelayMessageCancelOrder(11L);
return CommonResult.success(null, "下单成功");
}

@Override
public void cancelOrder(Long orderId) {
//todo 执行一系类取消订单操作
LOGGER.info("process cancelOrder orderId:{}",orderId);
}

private void sendDelayMessageCancelOrder(Long orderId) {
//获取订单超时时间，假设为60分钟
long delayTimes = 30 * 1000;
//发送延迟消息
cancelOrderSender.sendMessage(orderId, delayTimes);
}

}

编写订单controller

package cn.zxw.controller;

import cn.zxw.bean.OrderParam;
import cn.zxw.bean.result.CommonResult;
import cn.zxw.service.OmsPortalOrderService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

/**
* @author zxw
* @version 1.0
* @description 订单controller
* @data: 2020/2/25 18:00
*/
@RestController
@Api(tags = "OmsPortalOrderController", description = "订单管理")
@RequestMapping("/order")
public class OmsPortalOrderController {
@Autowired
private OmsPortalOrderService portalOrderService;

@ApiOperation("根据购物车信息生成订单")
@RequestMapping(value = "/generateOrder", method = RequestMethod.POST)
public CommonResult  generateOrder(@RequestBody OrderParam orderParam) {
return portalOrderService.generateOrder(orderParam);
}
}

大致就是这样，可以起项目进行测试啦！

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