慕課網_《RabbitMQ消息中間件極速入門與實戰》學習總結

時間 2019-11-06

標籤 rabbitmq 消息中間件入門實戰學習總結欄目 RabbitMQ 简体版

原文原文鏈接

慕課網《RabbitMQ消息中間件極速入門與實戰》學習總結java

時間：2018年09月05日星期三
說明：本文部份內容均來自慕課網。@慕課網：https://www.imooc.com
教學源碼：無
學習源碼：https://github.com/zccodere/s...

第一章：RabbitMQ起步

1-1 課程導航

課程導航git

RabbitMQ簡介及AMQP協議
RabbitMQ安裝與使用
RabbitMQ核心概念
與SpringBoot整合
保障100%的消息可靠性投遞方案落地實現

1-2 RabbitMQ簡介

初識RabbitMQgithub

RabbitMQ是一個開源的消息代理和隊列服務器
用來經過普通協議在徹底不一樣的應用之間共享數據
RabbitMQ是使用Erlang語言來編寫的
而且RabbitMQ是基於AMQP協議的

RabbitMQ簡介web

目前不少互聯網大廠都在使用RabbitMQ
RabbitMQ底層採用Erlang語言進行編寫
開源、性能優秀，穩定性保障
與SpringAMQP完美的整合、API豐富
集羣模式豐富，表達式配置，HA模式，鏡像隊列模型
保證數據不丟失的前提作到高可靠性、可用性
AMQP全稱：Advanced Message Queuing Protocol
AMQP翻譯：高級消息隊列協議

AMQP協議模型spring

1-3 RabbitMQ安裝

學習筆記apache

0.安裝準備
官網地址：http://www.rabbitmq.com/
安裝Linux必要依賴包<Linux7>
下載RabbitMQ安裝包
進行安裝，修改相關配置文件
vim /etc/hostname
vim /etc/hosts

1.安裝Erlang
wget https://packages.erlang-solutions.com/erlang-solutions_1.0_all.deb
sudo dpkg -i erlang-solutions_1.0_all.deb
sudo apt-get install erlang erlang-nox

2.安裝RabbitMQ
echo 'deb http://www.rabbitmq.com/debian/ testing main' | sudo tee /etc/apt/sources.list.d/rabbitmq.list
wget -O- https://www.rabbitmq.com/rabbitmq-release-signing-key.asc | sudo apt-key add -
sudo apt-get install rabbitmq-server

3.安裝RabbitMQ web管理插件
sudo rabbitmq-plugins enable rabbitmq_management
sudo systemctl restart rabbitmq-server
訪問：http://localhost:15672
默認用戶名密碼：guest/guest

4.修改RabbitMQ配置
vim /usr/lib/rabbitmq/lib/rabbitmq_server-3.5.7/ebin/rabbit.app
好比修改密碼、配置等等；例如：loopback_users中的<<"guest">>，只保留guest
服務啓動：rabbitmq-server start &
服務中止：rabbitmqctl app_stop

1-4 RabbitMQ概念

RabbitMQ的總體架構json

RabbitMQ核心概念vim

Server：又稱Broker，接受客戶端的鏈接，實現AMQP實體服務
Connection：鏈接，應用程序與Broker的網絡鏈接
Channel：網絡信道api

幾乎全部的操做都在Channel中進行
Channel是進行消息讀寫的通道
客戶端可創建多個Channel
每一個Channel表明一個會話任務
Message：消息服務器

服務器和應用程序之間傳送的數據，由Properties和Body組成
Properties能夠對消息進行修飾，好比消息的優先級、延遲等高級特性
Body則就是消息體內容
Virtual host：虛擬機

用於進行邏輯隔離，最上層的消息路由
一個Virtual host裏面能夠有若干個Exchange和Queue
同一個Virtual host裏面不能有相同名稱的Exchange或Queue
Exchange：交換機，接收消息，根據路由鍵轉發消息到綁定的隊列
Binding：Exchange和Queue之間的虛擬鏈接，binding中能夠包含routing key
Routing key：一個路由規則，虛擬機可用它來肯定如何路由一個特定消息
Queue：也稱爲Message Queue，消息隊列，保存消息並將它們轉發給消費者

RabbitMQ消息的流轉過程

第二章：RabbitMQ使用

2-1 發送消息

SpringBoot與RabbitMQ集成

引入相關依賴
對application.properties進行配置

建立名爲rabbitmq-producer的maven工程pom以下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>47-rabbitmq</artifactId>
        <groupId>com.myimooc</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rabbitmq-producer</artifactId>

    <properties>
        <spring.boot.version>2.0.4.RELEASE</spring.boot.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-parent</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!--RabbitMQ依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

        <!--工具類依賴-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.36</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.編寫Order類

package com.myimooc.rabbitmq.entity;

import java.io.Serializable;

/**
 * <br>
 * 標題: 訂單實體<br>
 * 描述: 訂單實體<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
public class Order implements Serializable{

    private static final long serialVersionUID = 6771608755338249746L;

    private String id;

    private String name;
    /**
     * 存儲消息發送的惟一標識
     */
    private String messageId;

    public Order() {
    }

    public Order(String id, String name, String messageId) {
        this.id = id;
        this.name = name;
        this.messageId = messageId;
    }

    @Override
    public String toString() {
        return "Order{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", messageId='" + messageId + ''' +
                '}';
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMessageId() {
        return messageId;
    }

    public void setMessageId(String messageId) {
        this.messageId = messageId;
    }
}

2.編寫OrderSender類

package com.myimooc.rabbitmq.producer.producer;

import com.myimooc.rabbitmq.entity.Order;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * <br>
 * 標題: 訂單消息發送者<br>
 * 描述: 訂單消息發送者<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@Component
public class OrderSender {

    private RabbitTemplate rabbitTemplate;

    @Autowired
    public OrderSender(
            RabbitTemplate rabbitTemplate) {
        this.rabbitTemplate = rabbitTemplate;
    }

    /**
     * 發送訂單
     *
     * @param order 訂單
     * @throws Exception 異常
     */
    public void send(Order order) throws Exception {

        CorrelationData correlationData = new CorrelationData();
        correlationData.setId(order.getMessageId());

        // exchange：交換機
        // routingKey：路由鍵
        // message：消息體內容
        // correlationData：消息惟一ID
        this.rabbitTemplate.convertAndSend("order-exchange", "order.a", order, correlationData);
    }

}

3.編寫application.properties類

# RabbitMQ配置
spring.rabbitmq.addresses=192.168.0.105:5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
spring.rabbitmq.connection-timeout=15000

# Server配置
server.servlet.context-path=/
server.port=8080

spring.http.encoding.charset=UTF-8
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8
spring.jackson.default-property-inclusion=NON_NULL

4.編寫Application類

package com.myimooc.rabbitmq.producer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * <br>
 * 標題: 啓動類<br>
 * 描述: 啓動類<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

5.編寫OrderSenderTest類

package com.myimooc.rabbitmq.producer.producer;

import com.myimooc.rabbitmq.entity.Order;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.UUID;

/**
 * <br>
 * 標題: 訂單消息發送者測試<br>
 * 描述: 訂單消息發送者測試<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class OrderSenderTest {

    @Autowired
    private OrderSender orderSender;

    @Test
    public void testSend1() throws Exception {
        Order order = new Order();
        order.setId("201809062009010001");
        order.setName("測試訂單1");
        order.setMessageId(System.currentTimeMillis() + "$" + UUID.randomUUID().toString().replaceAll("-",""));
        this.orderSender.send(order);
    }
}

2-2 處理消息

建立名爲rabbitmq-consumer的maven工程pom以下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>47-rabbitmq</artifactId>
        <groupId>com.myimooc</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rabbitmq-consumer</artifactId>

    <properties>
        <spring.boot.version>2.0.4.RELEASE</spring.boot.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-parent</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!--RabbitMQ依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

        <!--工具類依賴-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.36</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.編寫Order類

package com.myimooc.rabbitmq.entity;

import java.io.Serializable;

/**
 * <br>
 * 標題: 訂單實體<br>
 * 描述: 訂單實體<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
public class Order implements Serializable{

    private static final long serialVersionUID = 6771608755338249746L;

    private String id;

    private String name;
    /**
     * 存儲消息發送的惟一標識
     */
    private String messageId;

    public Order() {
    }

    public Order(String id, String name, String messageId) {
        this.id = id;
        this.name = name;
        this.messageId = messageId;
    }

    @Override
    public String toString() {
        return "Order{" +
                "id='" + id + ''' +
                ", name='" + name + ''' +
                ", messageId='" + messageId + ''' +
                '}';
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMessageId() {
        return messageId;
    }

    public void setMessageId(String messageId) {
        this.messageId = messageId;
    }
}

2.編寫OrderReceiver類

package com.myimooc.rabbitmq.consumer.consumer;

import com.rabbitmq.client.Channel;
import com.myimooc.rabbitmq.entity.Order;
import org.springframework.amqp.rabbit.annotation.*;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.messaging.handler.annotation.Headers;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;

import java.util.Map;

/**
 * <br>
 * 標題: 訂單接收者<br>
 * 描述: 訂單接收者<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@Component
public class OrderReceiver {

    /**
     * 接收消息
     *
     * @param order   消息體內容
     * @param headers 消息頭內容
     * @param channel 網絡信道
     * @throws Exception 異常
     */
    @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "order-queue",durable = "true"),
            exchange = @Exchange(name = "order-exchange",type = "topic"),
            key = "order.*"
    ))
    @RabbitHandler
    public void onOrderMessage(@Payload Order order, @Headers Map<String, Object> headers, Channel channel) throws Exception {
        // 消費者操做
        System.out.println("收到消息：");
        System.out.println("訂單信息：" + order.toString());

        // 手動簽收消息
        Long deliveryTag = (Long) headers.get(AmqpHeaders.DELIVERY_TAG);
        channel.basicAck(deliveryTag, false);
    }
}

3.編寫application.properties類

# RabbitMQ鏈接配置
spring.rabbitmq.addresses=192.168.0.105:5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
spring.rabbitmq.connection-timeout=15000
# RabbitMQ消費配置
# 基本併發：5
spring.rabbitmq.listener.simple.concurrency=5
# 最大併發：10
spring.rabbitmq.listener.simple.max-concurrency=10
# 簽收模式：手動簽收
spring.rabbitmq.listener.simple.acknowledge-mode=manual
# 限流策略：同一時間只有1條消息發送過來消費
spring.rabbitmq.listener.simple.prefetch=1

# Server配置
server.servlet.context-path=/
server.port=8082

spring.http.encoding.charset=UTF-8
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8
spring.jackson.default-property-inclusion=NON_NULL

4.編寫Application類

package com.myimooc.rabbitmq.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * <br>
 * 標題: 啓動類<br>
 * 描述: 啓動類<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

第三章：可靠性投遞

3-1 設計方案

保障100%消息投遞成功設計方案（一）

3-2 代碼詳解

因篇幅限制，源碼請到github地址查看，這裏僅展現核心關鍵類

1.編寫OrderSender類

package com.myimooc.rabbitmq.ha.producer;

import com.myimooc.rabbitmq.entity.Order;
import com.myimooc.rabbitmq.ha.constant.Constants;
import com.myimooc.rabbitmq.ha.dao.mapper.BrokerMessageLogMapper;
import com.myimooc.rabbitmq.ha.dao.po.BrokerMessageLogPO;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * <br>
 * 標題: 訂單消息發送者<br>
 * 描述: 訂單消息發送者<br>
 * 時間: 2018/09/06<br>
 *
 * @author zc
 */
@Component
public class OrderSender {

    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;
    /**
     * 回調方法：confirm確認
     */
    private final RabbitTemplate.ConfirmCallback confirmCallback = new RabbitTemplate.ConfirmCallback() {
        @Override
        public void confirm(CorrelationData correlationData, boolean ack, String cause) {
            System.out.println("correlationData：" + correlationData);
            String messageId = correlationData.getId();
            if (ack) {
                // 若是confirm返回成功，則進行更新
                BrokerMessageLogPO messageLogPO = new BrokerMessageLogPO();
                messageLogPO.setMessageId(messageId);
                messageLogPO.setStatus(Constants.OrderSendStatus.SEND_SUCCESS);
                brokerMessageLogMapper.changeBrokerMessageLogStatus(messageLogPO);
            } else {
                // 失敗則進行具體的後續操做：重試或者補償等
                System.out.println("異常處理...");
            }
        }
    };

    /**
     * 發送訂單
     *
     * @param order 訂單
     */
    public void send(Order order) {
        // 設置回調方法
        this.rabbitTemplate.setConfirmCallback(confirmCallback);
        // 消息ID
        CorrelationData correlationData = new CorrelationData(order.getMessageId());
        // 發送消息
        this.rabbitTemplate.convertAndSend("order-exchange", "order.a", order, correlationData);
    }
}

2.編寫OrderService類

package com.myimooc.rabbitmq.ha.service;

import com.myimooc.rabbitmq.entity.Order;
import com.myimooc.rabbitmq.ha.constant.Constants;
import com.myimooc.rabbitmq.ha.dao.mapper.BrokerMessageLogMapper;
import com.myimooc.rabbitmq.ha.dao.mapper.OrderMapper;
import com.myimooc.rabbitmq.ha.dao.po.BrokerMessageLogPO;
import com.myimooc.rabbitmq.ha.producer.OrderSender;
import com.myimooc.rabbitmq.ha.util.FastJsonConvertUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Date;

/**
 * <br>
 * 標題: 訂單服務<br>
 * 描述: 訂單服務<br>
 * 時間: 2018/09/07<br>
 *
 * @author zc
 */
@Service
public class OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;
    @Autowired
    private OrderSender orderSender;

    /**
     * 建立訂單
     *
     * @param order 訂單
     */
    public void create(Order order) {
        // 當前時間
        Date orderTime = new Date();
        // 業務數據入庫
        this.orderMapper.insert(order);
        // 消息日誌入庫
        BrokerMessageLogPO messageLogPO = new BrokerMessageLogPO();
        messageLogPO.setMessageId(order.getMessageId());
        messageLogPO.setMessage(FastJsonConvertUtils.convertObjectToJson(order));
        messageLogPO.setTryCount(0);
        messageLogPO.setStatus(Constants.OrderSendStatus.SENDING);
        messageLogPO.setNextRetry(DateUtils.addMinutes(orderTime, Constants.ORDER_TIMEOUT));
        this.brokerMessageLogMapper.insert(messageLogPO);
        // 發送消息
        this.orderSender.send(order);
    }
}

3.編寫RetryMessageTask類

package com.myimooc.rabbitmq.ha.task;

import com.myimooc.rabbitmq.entity.Order;
import com.myimooc.rabbitmq.ha.constant.Constants;
import com.myimooc.rabbitmq.ha.dao.mapper.BrokerMessageLogMapper;
import com.myimooc.rabbitmq.ha.dao.po.BrokerMessageLogPO;
import com.myimooc.rabbitmq.ha.producer.OrderSender;
import com.myimooc.rabbitmq.ha.util.FastJsonConvertUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.util.List;

/**
 * <br>
 * 標題: 重發消息定時任務<br>
 * 描述: 重發消息定時任務<br>
 * 時間: 2018/09/07<br>
 *
 * @author zc
 */
@Component
public class RetryMessageTask {

    private Logger logger = LoggerFactory.getLogger(getClass());

    @Autowired
    private OrderSender orderSender;
    @Autowired
    private BrokerMessageLogMapper brokerMessageLogMapper;

    /**
     * 啓動完成3秒後開始執行，每隔10秒執行一次
     */
    @Scheduled(initialDelay = 3000, fixedDelay = 10000)
    public void retrySend() {
        logger.debug("重發消息定時任務開始");
        // 查詢 status = 0 和 timeout 的消息日誌
        List<BrokerMessageLogPO> pos = this.brokerMessageLogMapper.listSendFailureAndTimeoutMessage();
        for (BrokerMessageLogPO po : pos) {
            logger.debug("處理消息日誌：{}",po);
            if (po.getTryCount() >= Constants.MAX_RETRY_COUNT) {
                // 更新狀態爲失敗
                BrokerMessageLogPO messageLogPO = new BrokerMessageLogPO();
                messageLogPO.setMessageId(po.getMessageId());
                messageLogPO.setStatus(Constants.OrderSendStatus.SEND_FAILURE);
                this.brokerMessageLogMapper.changeBrokerMessageLogStatus(messageLogPO);
            } else {
                // 進行重試，重試次數+1
                this.brokerMessageLogMapper.updateRetryCount(po);
                Order reSendOrder = FastJsonConvertUtils.convertJsonToObject(po.getMessage(), Order.class);
                try {
                    this.orderSender.send(reSendOrder);
                } catch (Exception ex) {
                    // 異常處理
                    logger.error("消息發送異常：{}", ex);
                }
            }
        }
        logger.debug("重發消息定時任務結束");
    }
}

4.編寫ApplicationTest類

package com.myimooc.rabbitmq.ha;

import com.myimooc.rabbitmq.entity.Order;
import com.myimooc.rabbitmq.ha.service.OrderService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.UUID;

/**
 * <br>
 * 標題: 訂單建立測試<br>
 * 描述: 訂單建立測試<br>
 * 時間: 2018/09/07<br>
 *
 * @author zc
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTest {

    @Autowired
    private OrderService orderService;

    @Test
    public void testCreateOrder(){
        Order order = new Order();
        order.setId(String.valueOf(System.currentTimeMillis()));
        order.setName("測試建立訂單");
        order.setMessageId(System.currentTimeMillis() + "$" + UUID.randomUUID().toString().replaceAll("-",""));
        this.orderService.create(order);
    }

}