MQ(Message Queue)消息队列 主要解决:异步处理、应用解耦、流量削峰等问题,是分布式系统的重要组件,从而实现高性能,高可用,可伸缩和最终一致性的架构,rabbitmq 是 消息队列中的一种。
通过消息队列,生产者无需等待消费者完成处理即可继续执行其他任务,从而提高系统响应速度和吞吐量。例如,在用户下单后,订单系统可以将订单信息发送到消息队列,然后立即返回给用户确认信息,而物流系统或库存系统则在后台异步地从队列中获取并处理订单。
不同应用程序之间通过消息队列通信,不再直接依赖对方的接口调用,当某一方进行升级或重构时,不会影响其他系统的运行。例如,一个支付系统可以向消息队列发布支付成功的通知,而积分系统、仓库系统等分别订阅这些消息来更新各自的业务状态,彼此独立工作。
当短时间内有大量的请求涌入系统时,消息队列可以作为缓冲区存储这些请求,以恒定的速度分发给下游服务,避免了因为瞬间高峰导致的服务崩溃。
Advanced Message Queuing Protocol 是一个开放标准的消息中间件协议,它定义了消息代理和应用程序之间的交互方式。RabbitMQ即是基于AMQP协议实现的消息队列产品,提供了一种标准化的方式来保证跨语言和平台的可靠消息传输。
Java Message Server,Java消息服务应用程序接口,一种规范,和JDBC担任的角色类似
是一个Java平台中关于面向消息中间件的API,用于在两个应用程序之间,或分布式系统中发送消 息,进行异步通信
JMS是定义了统一接口,统一消息操作;AMQP通过协议统一数据交互格式
JMS必须是java语言;AMQP只是协议,与语言无关
RabbitMQ服务器端是使用Erlang语言编写的,Erlang以其高并发、容错性和分布式计算能力闻名,非常适合用于构建像RabbitMQ这样需要高度稳定和可扩展的消息中间件。
rabbitmq的安装通常涉及到如下两个步骤,可以参考博文Linux安装RabbitMQ详细教程(最详细的图文教程)-CSDN博客:
启动后台管理插件
[root@localhost opt]# rabbitmq-plugins enable rabbitmq_management
启动、查看状态、重启、关闭 rabbitmq
[root@localhost opt]# systemctl start rabbitmq-server.service
[root@localhost opt]# systemctl status rabbitmq-server.service
[root@localhost opt]# systemctl restart rabbitmq-server.service
[root@localhost opt]# systemctl stop rabbitmq-server.service
查看进程
[root@localhost opt]# ps -ef | grep rabbitmq
测试
关闭防火墙: systemctl stop firewalld
浏览器输入:http://ip:15672
默认帐号密码:guest,guest用户默认不允许远程连接
创建账号
[root@localhost opt]# rabbitmqctl add_user 你的用户名 你的密码
设置用户角色
[root@localhost opt]# rabbitmqctl set_user_tags 你的用户名 administrator
设置用户权限
[root@localhost opt]# rabbitmqctl set_permissions -p "/" 你的用户名 ".*"
".*" ".*"
查看当前用户和角色
[root@localhost opt]# rabbitmqctl list_users
修改用户密码
[root@localhost opt]# rabbitmqctl change_password 你的用户名 新的密码
web界面介绍:
端口:
5672:RabbitMQ提供给编程语言客户端链接的端口
15672:RabbitMQ管理界面的端口
25672:RabbitMQ集群的端口
远程登录创建的账号,在Admin下添加了用户
pom依赖
<dependencies>
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.7.3</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.25</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
</dependencies>
创建连接工具类
package utils;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
public class ConnectionUtil {
public static Connection getConnection() throws Exception{
//1、创建连接工厂
ConnectionFactory factory = new ConnectionFactory();
//2、在工厂对象中设置MQ的连接信息(ip、port、vhost、username、password)
factory.setHost("192.168.81.121");
factory.setPort(5672);
factory.setVirtualHost("/lb");
factory.setUsername("lb");
factory.setPassword("123123");
//3、通过工厂获得与MQ的连接
Connection connection = factory.newConnection();
return connection;
}
public static void main(String[] args) throws Exception {
Connection connection = getConnection();
System.out.println("connection = " + connection);
connection.close();
}
}
运行测试结果
5种消息模型,大体分为两类:点对点、发布订阅模式(一对多)
生产者
package simplest;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
String msg = "Hello world!";
//1、获取连接
Connection connection = ConnectionUtil.getConnection();
//2、在连接中创建通道(信道)
Channel channel = connection.createChannel();
/*3、创建消息队列
参数1、队列中的名称
参数2、队列的数据是否持久化
参数3、是否排外(是否支持扩展,当前队列只能自己用,不能给别人用)
参数4、是否自动删除(当队列的连接数为0时,队列会销毁,不管队列是否还存保存数据)
参数5、队列参数(没有参数为null)
*
* */
channel.queueDeclare("queue1", false, false, false, null);
/*4、向指定队列发送消息
参数1、交换机名称,简单模式没有交换机,所以名称为""
参数2、目标队列的名称
参数3、设置消息的属性(没有属性为null)
参数4、消息的内容(只接受字节数组)
*/
channel.basicPublish("", "queue1", null, msg.getBytes());
System.out.println("发送:" + msg);
//5、释放资源
channel.close();
connection.close();
}
}
消费者
package simplest;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver {
public static void main(String[] args) throws Exception {
//1、获得连接
Connection connection = ConnectionUtil.getConnection();
//2、获得通道(信道)
Channel channel = connection.createChannel();
//3、从信道获得消息
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
/*
交付处理
参数1:收件人信息
参数2:包裹上的快递标签
参数3:协议的配置
参数4:消息
*/
String s = new String(body);
System.out.println("接收到的消息:" + s);
}
};
//4、监听队列 true:自动消息确认
channel.basicConsume("queue1", true, consumer);
}
}
测试结果
先运行sender,此时Queue中存入一个消息:
再运行receiver,此时Queue中的消息被消费:
消息确认机制
消息可以设置手动确认,这样可以保证:
修改消费者代码:
package simplest;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class ReceiverByAck {
public static void main(String[] args) throws Exception {
//1、获得连接
Connection connection = ConnectionUtil.getConnection();
//2、获得通道
Channel channel = connection.createChannel();
//3、从channel中获取消息
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
//body就是从队列中获取的消息
String s = new String(body);
System.out.println("接收消息:" + s);
//手动确认(收件人信息,是否同时确认多个消息)
System.out.println("消息已接收并正常处理完毕!手动确认回执!");
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//4、设置手动确认
channel.basicConsume("queue1", false, consumer);
}
}
再次运行sender和receiver测试结果:
如图,此种模式区别于简单模式主要是多个消费者共同消费消息,但注意,仍然是一个消息对应一个消费者。
生产者代码类似简单模式,只是循环发了多条消息
package work;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
channel.queueDeclare("test_work_queue", false, false, false, null);
for (int i = 0; i < 100; i++) {
String msg = "产生的消息====>>>" + i;
channel.basicPublish("", "test_work_queue", null, msg.getBytes());
System.out.println(msg);
}
channel.close();
connection.close();
}
}
消费者同样声明了消息队列,这样可以提前开启监听消息队列;同时,消费者1延时300ms,消费者2延时1000ms,便于观察;
消费者1
package work;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
static int num = 1;//统计消费的消息数目
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
final Channel channel = connection.createChannel();
//queueDeclare() 此方法有双重作用,如果队列不存在,就创建;如果队列存在,则获取
// 使用此方法可以保证先启动消费者不会报错
channel.queueDeclare("test_work_queue", false, false, false, null);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("Receiver1 消费了" + s + "! 总共消费了" + num++ + "条消息!");
//延迟时间
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
//手动确认
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//设置监听
channel.basicConsume("test_work_queue", false, consumer);
}
}
消费者2
package work;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
static int num = 1;//统计消费的消息数目
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
final Channel channel = connection.createChannel();
//queueDeclare() 此方法有双重作用,如果队列不存在,就创建;如果队列存在,则获取
// 使用此方法可以保证先启动消费者不会报错
channel.queueDeclare("test_work_queue", false, false, false, null);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("Receiver2 消费了" + s + "! 总共消费了" + num++ + "条消息!");
//延迟时间
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//手动确认
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//设置监听
channel.basicConsume("test_work_queue", false, consumer);
}
}
测试结果:
先开启消费者,后台就存在了相应队列:
再运行生产者:
可以看到消费者1消费消息的效率高,但仍然只消费50个,说明生产者的消息是完全均匀分配的,这不符合正常的需求,我们想按照效率分配,需添加如下代码:
channel.basicQos(1);
修改后的消费者代码:
消费者1
package work;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
static int num = 1;//统计消费的消息数目
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
final Channel channel = connection.createChannel();
//queueDeclare() 此方法有双重作用,如果队列不存在,就创建;如果队列存在,则获取
// 使用此方法可以保证先启动消费者不会报错
channel.queueDeclare("test_work_queue", false, false, false, null);
channel.basicQos(1);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("Receiver1 消费了" + s + "! 总共消费了" + num++ + "条消息!");
//延迟时间
try {
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
//手动确认
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//设置监听
channel.basicConsume("test_work_queue", false, consumer);
}
}
消费者2
package work;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
static int num = 1;//统计消费的消息数目
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
final Channel channel = connection.createChannel();
//queueDeclare() 此方法有双重作用,如果队列不存在,就创建;如果队列存在,则获取
// 使用此方法可以保证先启动消费者不会报错
channel.queueDeclare("test_work_queue", false, false, false, null);
channel.basicQos(1);
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("Receiver2 消费了" + s + "! 总共消费了" + num++ + "条消息!");
//延迟时间
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//手动确认
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//设置监听
channel.basicConsume("test_work_queue", false, consumer);
}
}
先开启消费者,再运行生产者,测试结果:
注意:能者多劳必须要配合手动的ACK机制才生效
发布订阅模式添加了 X(交换机 Exchange),该角色主要实现消息的分发,当多个消息队列绑定了该交换机时,该交换机会把消息广播到所有绑定到它的队列,所以所有订阅了相应队列的消费者都会收到相同的消息。
生产者
package fanout;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// 声明路由(路由名,路由类型)
// fanout:不处理路由键(只需要将队列绑定到路由上,发送到路由的消息都会被转发到与该路由绑定的所有队列上)
channel.exchangeDeclare("test_fanout_exchange", "fanout");
String msg = "hello,everyone!";
channel.basicPublish("test_fanout_exchange", "", null, msg.getBytes());
System.out.println("生产者:" + msg);
channel.close();
connection.close();
}
}
消费者
消费者1
package fanout;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_fanout_queue1", false, false, false, null);
//绑定路由
channel.queueBind("test_fanout_queue1", "test_fanout_exchange", "");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者1: " + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_fanout_queue1", false, consumer);
}
}
消费者2
package fanout;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_fanout_queue2", false, false, false, null);
//绑定路由
channel.queueBind("test_fanout_queue2", "test_fanout_exchange", "");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者2: " + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_fanout_queue2", false, consumer);
}
}
测试:
先运行生产者,因为需要先创建交换机,此步的消息忽略。
再运行消费者,消费者的队列绑定交换机。
最后运行生产者。
路由模式可以定向分发消息给不同的队列,区别于发布订阅模式,主要是由 路由key区分了消息的种类,根据不同的消息种类分别分发给对应的消息队列。
生产者,发布消息时需要声明绑定哪种key
package direct;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明路由
// direct:根据路由键进行定向分发消息
channel.exchangeDeclare("test_direct_exchange", "direct");
String msg = "用户注册,【userid=100】";
channel.basicPublish("test_direct_exchange", "insert", null, msg.getBytes());
msg = "用户查询,【userid=200】";
channel.basicPublish("test_direct_exchange", "select", null, msg.getBytes());
channel.close();
connection.close();
}
}
消费者,一个绑定增删改的路由key,另一个绑定查询的路由key
消费者1
package direct;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_direct_queue1", false, false, false, null);
//队列绑定
channel.queueBind("test_direct_queue1", "test_direct_exchange", "insert");
channel.queueBind("test_direct_queue1", "test_direct_exchange", "delete");
channel.queueBind("test_direct_queue1", "test_direct_exchange", "update");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者1:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_direct_queue1", false, consumer);
}
}
消费者2
package direct;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_direct_queue2", false, false, false, null);
//队列绑定
channel.queueBind("test_direct_queue2", "test_direct_exchange", "select");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者2:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_direct_queue2", false, consumer);
}
}
测试:
先运行生产者,因为需要先创建交换机,此步的消息忽略。
再运行消费者,消费者的队列绑定交换机。
最后运行生产者。
注意:是 队列和路由键 进行绑定,当队列绑定了路由键,消费者再监听该队列时,所有的队列信息都能拿到。通常,每个消费者 只监听自己的消费队列。
通配符模式 和 路由模式的区别:
匹配符号:
*:只能匹配一个词(正好一个词,多一个不行,少一个也不行)
#:匹配0个或更多个词
生产者
package topic;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
channel.exchangeDeclare("test_topic_exchange", "topic");
String msg = "orange_rabbit";
channel.basicPublish("test_topic_exchange", "orange.rabbit", null, msg.getBytes() );
msg = "beautiful_smart_fox";
channel.basicPublish("test_topic_exchange", "beautiful.smart.fox#.fox", null, msg.getBytes() );
channel.close();
connection.close();
}
}
消费者
消费者1
package topic;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_topic_queue1", false, false, false, null);
//绑定队列
channel.queueBind("test_topic_queue1", "test_topic_exchange", "orange.*");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者1:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_topic_queue1", false, consumer);
}
}
消费者2
package topic;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列
channel.queueDeclare("test_topic_queue2", false, false, false, null);
//绑定队列
channel.queueBind("test_topic_queue2", "test_topic_exchange", "#.fox");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者2:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_topic_queue2", false, consumer);
}
}
测试:
先运行生产者,因为需要先创建交换机,此步的消息忽略。
再运行消费者,消费者的队列绑定交换机。
最后运行生产者。
消息丢失:
基于通配符模式代码修改
生产者修改
package persistence.topic;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.MessageProperties;
import utils.ConnectionUtil;
public class Sender {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
// 声明路由(路由名,路由类型,持久化)
channel.exchangeDeclare("test_topic_exchange2", "topic", true);
String msg = "orange_rabbit";
channel.basicPublish("test_topic_exchange", "orange.rabbit", null, msg.getBytes() );
msg = "beautiful_smart_fox";
//第三个参数可以让消息持久化
channel.basicPublish("test_topic_exchange", "beautiful.smart.fox#.fox", MessageProperties.PERSISTENT_TEXT_PLAIN, msg.getBytes() );
channel.close();
connection.close();
}
}
消费者
消费者1
package persistence.topic;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver1 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列,第二个参数为true:支持持久化
channel.queueDeclare("test_topic_queue1", true, false, false, null);
//绑定队列
channel.queueBind("test_topic_queue1", "test_topic_exchange", "orange.*");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者1:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_topic_queue1", false, consumer);
}
}
消费者2
package persistence.topic;
import com.rabbitmq.client.*;
import utils.ConnectionUtil;
import java.io.IOException;
public class Receiver2 {
public static void main(String[] args) throws Exception {
Connection connection = ConnectionUtil.getConnection();
Channel channel = connection.createChannel();
//声明队列,第二个参数为true:支持持久化
channel.queueDeclare("test_topic_queue2", false, false, false, null);
//绑定队列
channel.queueBind("test_topic_queue2", "test_topic_exchange", "#.fox");
DefaultConsumer consumer = new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
String s = new String(body);
System.out.println("消费者2:" + s);
channel.basicAck(envelope.getDeliveryTag(), false);
}
};
//监听队列
channel.basicConsume("test_topic_queue2", false, consumer);
}
}