RabbitMQ消息确认机制

生产者发送消息出去之后，不知道到底有没有发送到RabbitMQ服务器， 默认是不知道的。而且有的时候我们在发送消息之后，后面的逻辑出问题了，我们不想要发送之前的消息了，需要撤回该怎么做。

解决方案:

 1.AMQP 事务机制   
 2.Confirm 模式 事务模式:  
 txSelect  将当前channel设置为transaction模式  
 txCommit  提交当前事务  
 txRollback  事务回滚

AMQP 事务机制

生产者

public class Producer {
	private static final String QUEUE_NAME = "test_queue";

	public static void main(String[] args) throws IOException, TimeoutException {
		// 1.获取连接
		Connection newConnection = MQConnectionUtils.newConnection();
		// 2.创建通道
		Channel channel = newConnection.createChannel();
		// 3.创建队列声明
		channel.queueDeclare(QUEUE_NAME, false, false, false, null);
		// 将当前管道设置为 txSelect 将当前channel设置为transaction模式 开启事务
		channel.txSelect();
		String msg = "test_selt791";
		try {
			// 4.发送消息
			channel.basicPublish("", QUEUE_NAME, null, msg.getBytes());
			// int i = 1 / 0;
			channel.txCommit();// 提交事务
			System.out.println("生产者发送消息:" + msg);
		} catch (Exception e) {
			System.out.println("消息进行回滚操作");
			channel.txRollback();// 回滚事务
		} finally {
			channel.close();
			newConnection.close();
		}

	}

}

消费者

// 1.获取连接
		Connection newConnection = MQConnectionUtils.newConnection();
		// 2.创建通道
		Channel channel = newConnection.createChannel();
		// 3.创建队列声明
		channel.queueDeclare(QUEUE_NAME, false, false, false, null);
		// confirm机制
		channel.confirmSelect();
		String msg = "test_selt791";
		// 4.发送消息
		channel.basicPublish("", QUEUE_NAME, null, msg.getBytes());
		System.out.println("生产者发送消息:" + msg);
		if (!channel.waitForConfirms()) {
			System.out.println("消息发送失败!");
		} else {
			System.out.println("消息发送成功!");
		}
		channel.close();
		newConnection.close();

SpringBoot整合RabbitMQ

生产者

Maven环境依赖

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>

		<!-- springboot-web组件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 添加springboot对amqp的支持 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-amqp</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
		</dependency>
		<!--fastjson -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.49</version>
		</dependency>
	</dependencies>

application.yml

spring:
  rabbitmq:
  ####连接地址
    host: 127.0.0.1
   ####端口号   
    port: 5672
   ####账号 
    username: guest
   ####密码  
    password: guest
   ### 地址
    virtual-host: /

交换机绑定队列

@Component
public class FanoutConfig {

	// 邮件队列
	private String FANOUT_EMAIL_QUEUE = "fanout_eamil_queue";

	// 短信队列
	private String FANOUT_SMS_QUEUE = "fanout_sms_queue";
	// 短信队列
	private String EXCHANGE_NAME = "fanoutExchange";

	// 1.定义队列邮件
	@Bean
	public Queue fanOutEamilQueue() {
		return new Queue(FANOUT_EMAIL_QUEUE);
	}

	@Bean
	public Queue fanOutSmsQueue() {
		return new Queue(FANOUT_SMS_QUEUE);
	}

	// 2.定义交换机
	@Bean
	FanoutExchange fanoutExchange() {
		return new FanoutExchange(EXCHANGE_NAME);
	}

	// 3.队列与交换机绑定邮件队列
	@Bean
	Binding bindingExchangeEamil(Queue fanOutEamilQueue, FanoutExchange fanoutExchange) {
		return BindingBuilder.bind(fanOutEamilQueue).to(fanoutExchange);
	}

	// 4.队列与交换机绑定短信队列
	@Bean
	Binding bindingExchangeSms(Queue fanOutSmsQueue, FanoutExchange fanoutExchange) {
		return BindingBuilder.bind(fanOutSmsQueue).to(fanoutExchange);
	}
}

生产者投递消息

@Component
public class FanoutProducer {
	@Autowired
	private AmqpTemplate amqpTemplate;

	public void send(String queueName) {
		String msg = "my_fanout_msg:" + new Date();
		System.out.println(msg + ":" + msg);
		amqpTemplate.convertAndSend(queueName, msg);
	}
}

控制层调用代码

@RestController
public class ProducerController {
	@Autowired
	private FanoutProducer fanoutProducer;

	@RequestMapping("/sendFanout")
	public String sendFanout(String queueName) {
		fanoutProducer.send(queueName);
		return "success";
	}
}

消费者

Maven环境依赖

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>

		<!-- springboot-web组件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- 添加springboot对amqp的支持 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-amqp</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
		</dependency>
		<!--fastjson -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.49</version>
		</dependency>
	</dependencies>

邮件消费者

@Component
@RabbitListener(queues = "fanout_eamil_queue")
public class FanoutEamilConsumer {
	@RabbitHandler
	public void process(String msg) throws Exception {
		System.out.println("邮件消费者获取生产者消息msg:" + msg);
	}
}

短信消费者

@Component
@RabbitListener(queues = "fanout_sms_queue")
public class FanoutSmsConsumer {
	@RabbitHandler
	public void process(String msg) {
		System.out.println("短信消费者获取生产者消息msg:" + msg);
	}
}

application.yml

spring:
  rabbitmq:
  ####连接地址
    host: 127.0.0.1
   ####端口号   
    port: 5672
   ####账号 
    username: guest
   ####密码  
    password: guest
   ### 地址
    virtual-host: /