集成RabbitMQ做秒杀

由于秒杀的并发量太大，所以仅仅使用缓存是不够的，还需要用到RabbitMQ。

这里推荐一款用于分库分表的中间件：mycat

解决超卖的问题（看第五章节）：

秒杀接口优化：

实操：

然后把下载好的文件上传到服务器上：

验证一下：

OK，到这一步，erlang安装好了。

启动rabbitMQ:

关闭：

或者：

配置环境变量：

在末尾加上：

使环境变量失效：

SpringBoot集成RabbitMQ：
添加依赖：

application.properties中配置:

#rabbitmq
spring.rabbitmq.host=10.110.3.62
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
#\u6D88\u8D39\u8005\u6570\u91CF
spring.rabbitmq.listener.simple.concurrency= 10
spring.rabbitmq.listener.simple.max-concurrency= 10
#\u6D88\u8D39\u8005\u6BCF\u6B21\u4ECE\u961F\u5217\u83B7\u53D6\u7684\u6D88\u606F\u6570\u91CF
spring.rabbitmq.listener.simple.prefetch= 1
#\u6D88\u8D39\u8005\u81EA\u52A8\u542F\u52A8
spring.rabbitmq.listener.simple.auto-startup=true
#\u6D88\u8D39\u5931\u8D25\uFF0C\u81EA\u52A8\u91CD\u65B0\u5165\u961F
spring.rabbitmq.listener.simple.default-requeue-rejected= true
#\u542F\u7528\u53D1\u9001\u91CD\u8BD5
spring.rabbitmq.template.retry.enabled=true
spring.rabbitmq.template.retry.initial-interval=1000
spring.rabbitmq.template.retry.max-attempts=3
spring.rabbitmq.template.retry.max-interval=10000
spring.rabbitmq.template.retry.multiplier=1.0

另外如果想用guest登录远程的rabbitMQ,必须设置如下：

代码部分：

MQConfig：

package com.imooc.miaosha.rabbitmq;

import java.util.HashMap;
import java.util.Map;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.HeadersExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MQConfig {

    public static final String MIAOSHA_QUEUE = "miaosha.queue";
    public static final String QUEUE = "queue";
    public static final String TOPIC_QUEUE1 = "topic.queue1";
    public static final String TOPIC_QUEUE2 = "topic.queue2";
    public static final String HEADER_QUEUE = "header.queue";
    public static final String TOPIC_EXCHANGE = "topicExchage";
    public static final String FANOUT_EXCHANGE = "fanoutxchage";
    public static final String HEADERS_EXCHANGE = "headersExchage";

    /**
     * Direct模式 交换机Exchange
     * */
    @Bean
    public Queue queue() {
        return new Queue(QUEUE, true);
    }

    /**
     * Topic模式 交换机Exchange
     * */
    @Bean
    public Queue topicQueue1() {
        return new Queue(TOPIC_QUEUE1, true);
    }
    @Bean
    public Queue topicQueue2() {
        return new Queue(TOPIC_QUEUE2, true);
    }
    @Bean
    public TopicExchange topicExchage(){
        return new TopicExchange(TOPIC_EXCHANGE);
    }
    @Bean
    public Binding topicBinding1() {
        return BindingBuilder.bind(topicQueue1()).to(topicExchage()).with("topic.key1");
    }
    @Bean
    public Binding topicBinding2() {
        return BindingBuilder.bind(topicQueue2()).to(topicExchage()).with("topic.#");
    }
    /**
     * Fanout模式 交换机Exchange
     * */
    @Bean
    public FanoutExchange fanoutExchage(){
        return new FanoutExchange(FANOUT_EXCHANGE);
    }
    @Bean
    public Binding FanoutBinding1() {
        return BindingBuilder.bind(topicQueue1()).to(fanoutExchage());
    }
    @Bean
    public Binding FanoutBinding2() {
        return BindingBuilder.bind(topicQueue2()).to(fanoutExchage());
    }
    /**
     * Header模式 交换机Exchange
     * */
    @Bean
    public HeadersExchange headersExchage(){
        return new HeadersExchange(HEADERS_EXCHANGE);
    }
    @Bean
    public Queue headerQueue1() {
        return new Queue(HEADER_QUEUE, true);
    }
    @Bean
    public Binding headerBinding() {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("header1", "value1");
        map.put("header2", "value2");
        return BindingBuilder.bind(headerQueue1()).to(headersExchage()).whereAll(map).match();
    }

}

MQSender：

package com.imooc.miaosha.rabbitmq;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.imooc.miaosha.redis.RedisService;

@Service
public class MQSender {

    private static Logger log = LoggerFactory.getLogger(MQSender.class);

    @Autowired
    AmqpTemplate amqpTemplate ;

    public void sendMiaoshaMessage(MiaoshaMessage mm) {
        String msg = RedisService.beanToString(mm);
        log.info("send message:"+msg);
        amqpTemplate.convertAndSend(MQConfig.MIAOSHA_QUEUE, msg);
    }

//    public void send(Object message) {
//        String msg = RedisService.beanToString(message);
//        log.info("send message:"+msg);
//        amqpTemplate.convertAndSend(MQConfig.QUEUE, msg);
//    }
//
//    public void sendTopic(Object message) {
//        String msg = RedisService.beanToString(message);
//        log.info("send topic message:"+msg);
//        amqpTemplate.convertAndSend(MQConfig.TOPIC_EXCHANGE, "topic.key1", msg+"1");
//        amqpTemplate.convertAndSend(MQConfig.TOPIC_EXCHANGE, "topic.key2", msg+"2");
//    }
//
//    public void sendFanout(Object message) {
//        String msg = RedisService.beanToString(message);
//        log.info("send fanout message:"+msg);
//        amqpTemplate.convertAndSend(MQConfig.FANOUT_EXCHANGE, "", msg);
//    }
//
//    public void sendHeader(Object message) {
//        String msg = RedisService.beanToString(message);
//        log.info("send fanout message:"+msg);
//        MessageProperties properties = new MessageProperties();
//        properties.setHeader("header1", "value1");
//        properties.setHeader("header2", "value2");
//        Message obj = new Message(msg.getBytes(), properties);
//        amqpTemplate.convertAndSend(MQConfig.HEADERS_EXCHANGE, "", obj);
//    }

}

MQReceiver：

package com.imooc.miaosha.rabbitmq;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.imooc.miaosha.domain.MiaoshaOrder;
import com.imooc.miaosha.domain.MiaoshaUser;
import com.imooc.miaosha.redis.RedisService;
import com.imooc.miaosha.service.GoodsService;
import com.imooc.miaosha.service.MiaoshaService;
import com.imooc.miaosha.service.OrderService;
import com.imooc.miaosha.vo.GoodsVo;

@Service
public class MQReceiver {

        private static Logger log = LoggerFactory.getLogger(MQReceiver.class);

        @Autowired
        RedisService redisService;

        @Autowired
        GoodsService goodsService;

        @Autowired
        OrderService orderService;

        @Autowired
        MiaoshaService miaoshaService;

        @RabbitListener(queues=MQConfig.MIAOSHA_QUEUE)
        public void receive(String message) {
            log.info("receive message:"+message);
            MiaoshaMessage mm  = RedisService.stringToBean(message, MiaoshaMessage.class);
            MiaoshaUser user = mm.getUser();
            long goodsId = mm.getGoodsId();

            GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
            int stock = goods.getStockCount();
            if(stock <= 0) {
                return;
            }
            //判断是否已经秒杀到了
            MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
            if(order != null) {
                return;
            }
            //减库存 下订单 写入秒杀订单
            miaoshaService.miaosha(user, goods);
        }

//        @RabbitListener(queues=MQConfig.QUEUE)
//        public void receive(String message) {
//            log.info("receive message:"+message);
//        }
//
//        @RabbitListener(queues=MQConfig.TOPIC_QUEUE1)
//        public void receiveTopic1(String message) {
//            log.info(" topic  queue1 message:"+message);
//        }
//
//        @RabbitListener(queues=MQConfig.TOPIC_QUEUE2)
//        public void receiveTopic2(String message) {
//            log.info(" topic  queue2 message:"+message);
//        }
//
//        @RabbitListener(queues=MQConfig.HEADER_QUEUE)
//        public void receiveHeaderQueue(byte[] message) {
//            log.info(" header  queue message:"+new String(message));
//        }
//        

}