RabbitMQ 消息类型
下面我们简单介绍下RabbitMQ的一些消息种类,并结合Java代码进行学习。
如果需要执行代码,需要下载RabbitMQ的客户端(例如java客户端: https://www.rabbitmq.com/java-client.html)
使用maven:
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.16.0</version>
</dependency>
注意先启动消费者,在启动生产者
5.x 版本系列需要 JDK 8
java-client 的文档:https://rabbitmq.github.io/rabbitmq-java-client/api/current/index.html
创建一个连接工具类ConnectionUtil
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 连接工具类
* @author cfl
* @version 1.0
* @date 2022/10/10 13:49
*/
public class ConnectionUtil {
/**
* 获取MQ的连接
* @return
*/
public static Connection getConnection() throws IOException, TimeoutException {
// 定义一个连接工厂
ConnectionFactory factory = new ConnectionFactory();
// 设置服务地址
factory.setHost("localhost");
// AMQP 5672
factory.setPort(5672);
// vhost
factory.setVirtualHost("/vhost01");
// 用户名
factory.setUsername("admin");
// 密码
factory.setPassword("123456");
return factory.newConnection();
}
}
simple 简单队列
P:消息生产者
红色:队列
C:消费者
3个对象:生产者 队列 消费者
生产者直接发送消息到队列,消费者直接从队列获取消息。发送消息时,只需要指定队列,不需要指定交换机,以及路由key,只有一个消费者。
示例
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 简单队列,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 13:58
*/
public class Send {
private static final String QUEUE_NAME="test_simple_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取一个连接
Connection connection = ConnectionUtil.getConnection();
// 从连接中获取一个通道
Channel channel = connection.createChannel();
// 声明一个队列
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
String message = "hello simple !";
// 第一个参数是exchangeName(默认情况下代理服务器端是存在一个""名字的exchange的,
channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
System.out.println("send message");
channel.close();
connection.close();
}
}
- 消息消费者:Recv
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 简单队列,消息消费者
* @author cfl
* @version 1.0
* @date 2022/10/10 14:00
*/
public class Recv {
private static final String QUEUE_NAME="test_simple_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 创建通道
Channel channel = connection.createChannel();
// 队列声明
channel.queueDeclare(QUEUE_NAME, false, false,false, null);
// 定义队列的消费者
DefaultConsumer defaultConsumer = new DefaultConsumer(channel){
// 获取到达的消息
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msgString = new String(body,"utf-8");
System.out.println("new api recv: " + msgString);
}
};
// 监听队列
channel.basicConsume(QUEUE_NAME, true, defaultConsumer);
}
}
简单队列的不足:耦合性高,生产者一一对应消费者(如果我想有多个消费者消费队列中消息,这时候就不行),队列名变更,这时候得同时变更。
work queues 工作队列
工作队列可以细分为轮询分发和公平分发。发送消息时,只需要指定队列,不需要指定交换机,以及路由key,设定多个消费者。
为什么会出现工作队列,因为simple 队列是一一对应的,而且我们实际开发,生产者发送消息是毫不费力的,而消费者一般是要跟业务相结合的,消费者接收到消息之后就需要处理,可能需要花费时间,这时候队列就会积压了很多消息。
round robin 轮询分发
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,轮询分发,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 14:12
*/
public class Send {
public static final String QUEUE_NAME = "test_round_robin_work_queue";
/**
* |--> C2
* P ---> Queue ----|
* |--> C1
* @param args
* @throws IOException
* @throws TimeoutException
*/
public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
// 发送消息
for (int i = 0; i < 50; i++) {
String msg= "send hello " + i;
channel.basicPublish("", QUEUE_NAME, null, msg.getBytes());
System.out.println("【WQ】 send msg = " + msg);
Thread.sleep(i*20);
}
// 关闭资源
channel.close();
connection.close();
}
}
- 消息消费者:Recv1
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,轮询分发,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:14
*/
public class Recv1 {
public static final String QUEUE_NAME = "test_round_robin_work_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
// 定义一个消费者
Consumer consumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [1] msg = " + msg);
try{
Thread.sleep(2000);
}catch (InterruptedException e) {
e.printStackTrace();
}finally{
System.out.println("Recv [1] done!");
}
}
};
// 监听队列
boolean autoAck = true;
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
}
- 消息消费者:Recv2
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,轮询分发,消息消费者2号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:14
*/
public class Recv2 {
public static final String QUEUE_NAME = "test_round_robin_work_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
// 定义一个消费者
DefaultConsumer defaultConsumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [2] msg = " + msg);
try{
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
System.out.println("Recv [2] done!");
}
}
};
// 监听队列
boolean autoAck = true;
channel.basicConsume(QUEUE_NAME, autoAck, defaultConsumer);
}
}
现象:
- 消费者1 和消费者2处理消息的数量是一样的。
- 消费者1:偶数。
- 消费者2:奇数。
- 这种方式叫做轮询分发(round-robin)结果就是不管谁忙或者谁清闲 都不会多给一个消息,任务总是你一个我一个。
fair dispatch 公平分发
公平分发,需要消费者进行手动回执
// MQ一次只发一个请求给消费者,当消费者处理完消息后会手动回执,然后MQ再发一个消息给消费者
channel.basicQos(1);
boolean autoAck = false; //false 手动回执,处理完消息后,告诉MQ
channel.basicConsume(QUEUE_NAME, autoAck, defaultConsumer);
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,公平分发,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 14:30
*/
public class Send {
public static final String QUEUE_NAME = "test_fair_dispatch_work_queue";
/**
* |--> C2
* P ---> Queue ----|
* |--> C1
* @param args
* @throws IOException
* @throws TimeoutException
*/
public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false, null);
/**
* 每个消费者 发送确认消息之前,消息队列不发送下一个消息到消费者,一次只处理一个消息
* 限制发送给同一个消费者 不得超过一条消息
*/
channel.basicQos(1);
// 发送消息
for (int i = 0; i < 50; i++) {
String msg= "send hello " + i;
channel.basicPublish("", QUEUE_NAME, null, msg.getBytes());
System.out.println("【WQ】 send msg = " + msg);
Thread.sleep(i*5);
}
// 关闭资源
channel.close();
connection.close();
}
}
- 消息消费者:Recv1
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,公平分发,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:14
*/
public class Recv1 {
public static final String QUEUE_NAME = "test_fair_dispatch_work_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
channel.basicQos(1);
// 定义一个消费者
Consumer consumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [1] msg = " + msg);
try{
Thread.sleep(2000);
}catch (InterruptedException e) {
e.printStackTrace();
}finally{
System.out.println("Recv [1] done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
// boolean autoAck = true; //自动应答
boolean autoAck = false; //手动应答
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
}
- 消息消费者:Recv2
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 工作队列,公平分发,消息消费者2号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:14
*/
public class Recv2 {
public static final String QUEUE_NAME = "test_fair_dispatch_work_queue";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
channel.basicQos(1);
// 定义一个消费者
DefaultConsumer defaultConsumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [2] msg = " + msg);
try{
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
System.out.println("Recv [2] done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
boolean autoAck = false; //false 手动回执
channel.basicConsume(QUEUE_NAME, autoAck, defaultConsumer);
}
}
现象:消费者2 处理的消息比消费者1多,能者多劳
publish/subscribe 发布-订阅模式
- 一个生产者,多个消费者,需要新建fanout交换机
- 每个消费者都有自己的队列,并绑定到交换机上
- 生产者没有直接把消息发送到队列,而是发送到交换机
- 消息发送时需要指定交换机,消息接收时需要指定队列
- 生产者发送的消息,经过交换机,到达队列。就能实现一个消息被多个消费者消费
注册成功时,既要发邮件,又要发短信
示例
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 发布订阅模式队列,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 14:51
*/
public class Send {
public static final String EXCHANGE_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// 声明交换机
channel.exchangeDeclare(EXCHANGE_NAME, "fanout"); //分发
// 发送消息
String msg = "hello ps";
channel.basicPublish(EXCHANGE_NAME, "", null, msg.getBytes());
System.out.println("Send msg = " + msg);
channel.close();
connection.close();
}
}
消息哪去了?? 丢失了,因为交换机没有存储的能力,在rabbitmq里面只有队列有存储的能力。因为还没有队列绑定到这个交换机,所以数据丢失了。
- 消息消费者:Recv1
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 发布订阅模式队列,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:59
*/
public class Recv1 {
public static final String QUEUE_NAME = "test_queue_fanout_email";
public static final String EXCHANGE_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
// 保证一次只分发一个
channel.basicQos(1);
// 绑定到交换机 转发器
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "");
// 定义一个消费者
Consumer consumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [1] msg = " + msg);
try{
Thread.sleep(2000);
}catch (InterruptedException e) {
e.printStackTrace();
}finally{
System.out.println("Recv [1] done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
boolean autoAck = false;
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
}
- 消息消费者:Recv2
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 发布订阅模式队列,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 14:59
*/
public class Recv2 {
public static final String QUEUE_NAME = "test_queue_fanout_sms";
public static final String EXCHANGE_NAME = "test_exchange_fanout";
public static void main(String[] args) throws IOException, TimeoutException {
// 获取连接
Connection connection = ConnectionUtil.getConnection();
// 获取channel
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
// 绑定到交换机 转发器
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "");
// 保证一次只分发一个
channel.basicQos(1);
// 定义一个消费者
Consumer consumer = new DefaultConsumer(channel) {
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [2] msg = " + msg);
try{
Thread.sleep(2000);
}catch (InterruptedException e) {
e.printStackTrace();
}finally{
System.out.println("Recv [2] done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
boolean autoAck = false;
channel.basicConsume(QUEUE_NAME, autoAck, consumer);
}
}
现象:消费者1和消费者2都受到了消息。
routing 路由选择通配符模式
- direct交换机类型
- 生产者需要将交换机和routing key绑定
- 消费者需要将队列,交换机,routing key 三者绑定
- 每个消息会根据不同的Routing key,发送到不同的消费者队列
- 不支持通配符(
*
,#
)
示例
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 路由模式队列,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 15:12
*/
public class Send {
public static final String EXCHANGE_NAME = "test_exchange_direct";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// exchange direct:直连
channel.exchangeDeclare(EXCHANGE_NAME, "direct");
String msg = "hello direct !";
// routing key
String routingKey = "info";
channel.basicPublish(EXCHANGE_NAME, routingKey, null, msg.getBytes());
System.out.println("send :" + msg);
channel.close();
connection.close();
}
}
- 消息消费者:Recv1
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 路由模式队列,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 15:13
*/
public class Recv1 {
public static final String EXCHANGE_NAME = "test_exchange_direct";
public static final String QUEUE_NAME = "test_queue_direct_1";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// 声明队列
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
// 绑定队列到交换机,并绑定 routingKey
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "error");
// 保证一次只分发一个
channel.basicQos(1);
// 定义一个消费者
Consumer consumer = new DefaultConsumer(channel){
// 消息到达,触发这个方法
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [1] msg = " + msg);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
System.out.println("Recv [1] done!");
}
}
};
// 监听队列 autoAck(消息应答):false 手动回执 (消息回执 channel.basicAck(envelope.getDeliveryTag(), false);)
channel.basicConsume(QUEUE_NAME, false, consumer);
}
}
- 消息消费者:Recv2
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 路由模式队列,消息消费者2号
* @author cfl
* @version 1.0
* @date 2022/10/10 15:13
*/
public class Recv2 {
public static final String EXCHANGE_NAME = "test_exchange_direct";
public static final String QUEUE_NAME = "test_queue_direct_2";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false, false, false,null);
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "error");
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "info");
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "waring");
channel.basicQos(1);
Consumer consumer = new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("Recv [2] msg = " + msg);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
System.out.println("Recv [2] done!");
}
}
};
channel.basicConsume(QUEUE_NAME, false, consumer);
}
}
现象:队列绑定的路由key和消息发送时指定的路由key匹配时,才会接收到消息。
Topics 主题
- Topic交换机类型,生产者需要申明topic交换机,并指定routing key。
- 和路由模式类似,但是Topic可以支持通配符,
#
匹配一个或者多个字符;*
匹配一个字符
商品:发布、删除、修改、查询
- 消息生产者:Send
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 主题队列,消息生产者
* @author cfl
* @version 1.0
* @date 2022/10/10 15:21
*/
public class Send {
public static final String EXCHANGE_NAME = "test_exchange_topic";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// 声明交换机 topic:主题模式
channel.exchangeDeclare(EXCHANGE_NAME, "topic");
String message = "商品...";
// goods.delete 只有消费者2号能收到(goods.#)
channel.basicPublish(EXCHANGE_NAME, "goods.delete", null, message.getBytes());
// 两个消费者都能收到
// channel.basicPublish(EXCHANGE_NAME, "goods.add", null, message.getBytes());
System.out.println("send message = " + message);
channel.close();
connection.close();
}
}
- 消息消费者:Recv1
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 主题队列,消息消费者1号
* @author cfl
* @version 1.0
* @date 2022/10/10 15:21
*/
public class Recv1 {
public static final String EXCHANGE_NAME = "test_exchange_topic";
public static final String QUEUE_NAME = "test_queue_topic_1";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false,false,false,null);
//绑定 商品新增 goods.add
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "goods.add");
channel.basicQos(1);
//定义消费者
Consumer consumer = new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("[1] recv msg: " + msg);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
System.out.println("[1] recv done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
channel.basicConsume(QUEUE_NAME, false, consumer);
}
}
- 消息消费者:Recv2
import com.goudong.modules.rabbitmq.demo.util.ConnectionUtil;
import com.rabbitmq.client.*;
import java.io.IOException;
import java.util.concurrent.TimeoutException;
/**
* 类描述:
* 主题队列,消息消费者2号
* @author cfl
* @version 1.0
* @date 2022/10/10 15:21
*/
public class Recv2 {
public static final String EXCHANGE_NAME = "test_exchange_topic";
public static final String QUEUE_NAME = "test_queue_topic_2";
public static void main(String[] args) throws IOException, TimeoutException {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
channel.queueDeclare(QUEUE_NAME, false,false,false,null);
//绑定 goods.# (`#` 匹配一个或者多个字符)
channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "goods.#");
channel.basicQos(1);
//定义消费者
Consumer consumer = new DefaultConsumer(channel){
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String msg = new String(body, "utf-8");
System.out.println("[2] recv msg: " + msg);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally{
System.out.println("[2] recv done!");
// 手动回执 false 表示只确认 envelope.DelivertTag 这条消息,true 表示确认 小于等于 b.DelivertTag 的所有消息(批量确认)
channel.basicAck(envelope.getDeliveryTag(), false);
}
}
};
// 监听队列
channel.basicConsume(QUEUE_NAME, false, consumer);
}
}
现象:只有满足生产者指定的路由模式,才会将消息发送到队列。
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