RabbitMq | 死信隊列

在定義業務隊列的時候，可以考慮指定一個死信交換機，並綁定一個死信隊列，當消息變成死信時，該消息就會被髮送到該死信隊列上，這樣就方便我們查看消息失敗的原因了

創建配置文件，建造交換機和短信以及郵件隊列

package com.sun.springboot.config;

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.DirectExchange;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

//Fanout 類型 發佈訂閱模式
@Component
public class FanoutConfig {

	/**
	 * 定義死信隊列相關信息
	 */
	public final static String deadQueueName = "dead_queue";
	public final static String deadRoutingKey = "dead_routing_key";
	public final static String deadExchangeName = "dead_exchange";
	/**
	 * 死信隊列 交換機標識符
	 */
	public static final String DEAD_LETTER_QUEUE_KEY = "x-dead-letter-exchange";
	/**
	 * 死信隊列交換機綁定鍵標識符
	 */
	public static final String DEAD_LETTER_ROUTING_KEY = "x-dead-letter-routing-key";

	// 郵件隊列
	private String FANOUT_EMAIL_QUEUE = "fanout_email_queue";

	// 短信隊列
	private String FANOUT_SMS_QUEUE = "fanout_sms_queue";
	// fanout 交換機
	private String EXCHANGE_NAME = "fanoutExchange";

	// 1.定義郵件隊列
	@Bean
	public Queue fanOutEamilQueue() {
		// 將普通隊列綁定到死信隊列交換機上
		Map<String, Object> args = new HashMap<>(2);
		args.put(DEAD_LETTER_QUEUE_KEY, deadExchangeName);
		args.put(DEAD_LETTER_ROUTING_KEY, deadRoutingKey);
		Queue queue = new Queue(FANOUT_EMAIL_QUEUE, true, false, false, args);
		return queue;
	}

	// 2.定義短信隊列
	@Bean
	public Queue fanOutSmsQueue() {
		return new Queue(FANOUT_SMS_QUEUE);
	}

	// 2.定義交換機
	@Bean
	FanoutExchange fanoutExchange() {
		return new FanoutExchange(EXCHANGE_NAME);
	}

	// 3.隊列與交換機綁定郵件隊列
	@Bean
	Binding bindingExchangeEamil(Queue fanOutEamilQueue, FanoutExchange fanoutExchange) {
		return BindingBuilder.bind(fanOutEamilQueue).to(fanoutExchange);
	}

	// 4.隊列與交換機綁定短信隊列
	@Bean
	Binding bindingExchangeSms(Queue fanOutSmsQueue, FanoutExchange fanoutExchange) {
		return BindingBuilder.bind(fanOutSmsQueue).to(fanoutExchange);
	}

	/**
	 * 配置死信隊列
	 *
	 * @return
	 */
	@Bean
	public Queue deadQueue() {
		Queue queue = new Queue(deadQueueName, true);
		return queue;
	}

	@Bean
	public DirectExchange deadExchange() {
		return new DirectExchange(deadExchangeName);
	}

	@Bean
	public Binding bindingDeadExchange(Queue deadQueue, DirectExchange deadExchange) {
		return BindingBuilder.bind(deadQueue).to(deadExchange).with(deadRoutingKey);
	}

}

將普通隊列綁定到死信隊列交換機上

	@Bean
	public Queue fanOutEamilQueue() {
		
		Map<String, Object> args = new HashMap<>(2);
		args.put(DEAD_LETTER_QUEUE_KEY, deadExchangeName);
		args.put(DEAD_LETTER_ROUTING_KEY, deadRoutingKey);
		Queue queue = new Queue(FANOUT_EMAIL_QUEUE, true, false, false, args);
		return queue;
	}

控制檯展示：

生產者發送消息：

import java.util.UUID;

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageBuilder;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSONObject;
    @Test
    public void test6 () throws JSONException {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("email", "644064779");
        jsonObject.put("timestamp", 0);

        String jsonString = jsonObject.toString();
        System.out.println("jsonString:" + jsonString);
        // 生產者發送消息的時候需要設置消息id
        MessageBuilder body = MessageBuilder.withBody(jsonString.getBytes());
        System.out.println("body = " + body);
        Message message = MessageBuilder.withBody(jsonString.getBytes())
                .setContentType(MessageProperties.CONTENT_TYPE_JSON).setContentEncoding("utf-8")
                .setMessageId(UUID.randomUUID() + "").build();

        System.out.println(message.getMessageProperties());
        System.out.println("message = " + message);
        amqpTemplate.convertAndSend("fanout_email_queue", "sssss");


    }

    @RabbitListener(queues = "fanout_email_queue")
    public void process(Message message, @Headers Map<String, Object> headers, Channel channel) throws Exception {
        String messageId = message.getMessageProperties().getMessageId();
        String msg = new String(message.getBody(), "UTF-8");
        System.out.println("郵件消費者獲取生產者消息msg:" + msg + ",消息id:" + messageId);

        try {
            int result = 1 / 0;
            System.out.println("result:" + result);
            // 通知mq服務器刪除該消息
            channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
        } catch (Exception e) {
        e.printStackTrace();
        // // 丟棄該消息
        channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, false);
        }
        }

死信隊列收到消息