RabbitMQ记录
官网：
https://www.rabbitmq.com/download.html
https://www.rabbitmq.com/install-rpm.html
Installing the package using Yum repositories on Package Cloud or Bintray (this option is highly recommended)
安装详细步骤
选择通过Package Cloud脚本，安装yum repo，然后直接yum安装的方式
# 两个密钥导入一下，不知道有什么用
# import the new PackageCloud key that will be used starting December 1st, 2018 (GMT)
$ rpm --import https://packagecloud.io/rabbitmq/rabbitmq-server/gpgkey
# import the old PackageCloud key that will be discontinued on December 1st, 2018 (GMT)
$ rpm --import https://packagecloud.io/gpg.key
# 安装yum源：会将相关依赖信息下载到 /etc/yum.repos.d
$ curl -s https://packagecloud.io/install/repositories/rabbitmq/erlang/script.rpm.sh | sudo bash
$ curl -s https://packagecloud.io/install/repositories/rabbitmq/rabbitmq-server/script.rpm.sh | sudo bash
# 安装erlang和rabbitmq-server（名字取的就是脚本url中的）
$ yum install -y erlang
$ yum install -y rabbitmq-server
# 启动、配置rabbitmq-server开机自启动
$ systemctl start rabbitmq-server
$ systemctl enable rabbitmq-server
$ systemctl status rabbitmq-server
# 启用rabbitmq-server的web界面
$ rabbitmq-plugins enable rabbitmq_management
# 默认只有一个guest/guest用户，且只能通过localhost访问，添加其他用户
$ rabbitmqctl add_user admin 123
# 设置管理员权限
$ rabbitmqctl set_user_tags admin administrator
概念
Virtual Host
可以理解为一个Rabbitmq服务，一个Rabbitmq进程中可以提供多个服务，每个服务里面都有一套独立的Exchange、Binding、Queue，各自之间不会互相影响
Exchange
交换机，接收生产者发送的消息，然后将消息路由到Queue中。主要由四种Exchange：direct、fanout、topic、headers（这个性能比较差，效果和direct差别不大，几乎不用了）
direct
找到消息中的路由键和Binding中的binding key相同的Binding，消息发送到对应Binding的队列中。
fanout
发送到fanout交换器的消息会被分发到所有绑定的队列上去，不关心路由键
topic
通过路由键与Binding的binding key进行模式匹配来转发，如上图所示
headers
略
Binding
绑定，Exchange和Queue之间的路由规则，基于路由键和Exchange类型
Queue
消息队列，用来保存消息，等待Consumer来消费
Channel
难道是SocketChannel？？？
代码示例
生产者
package test;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import java.util.UUID;
public class ProducerDemo {
private static Connection connection;
public static void main(String[] args) throws Exception {
// testDirect();
// testFanout();
testTopic();
connection.close();
}
private static Channel initChannel() throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setUsername("admin");
factory.setPassword("123");
factory.setHost("192.168.106.151");
factory.setVirtualHost("/");
factory.setPort(5672);
connection = factory.newConnection();
return connection.createChannel();
}
private static void testDirect() throws Exception {
// 获取信道
Channel channel = initChannel();
// 设置交换机名称和类型，配置服务重启后数据不保留（同时会创建交换机）
channel.exchangeDeclare("testDirectExchange", "direct", false);
// 这一步主要用来创建队列
channel.queueDeclare("testDirectQueue", false, false, false, null);
// 清空一下队列
channel.queuePurge("testDirectQueue");
// 不需要绑定操作？？？我怎么不绑定不行呢
channel.queueBind("testDirectQueue", "testDirectExchange", "testDirectQueue");
// 发送消息到指定的交换机，未设置header头内容（可以不必指定routing key）
for (int i = 0; i < 1000; i++) {
channel.basicPublish("testDirectExchange", "testDirectQueue", null, UUID.randomUUID().toString().getBytes());
}
channel.close();
}
private static void testFanout() throws Exception {
Channel channel = initChannel();
channel.exchangeDeclare("testFanoutExchange", "fanout", false);
channel.queueDeclare("testFanoutQueue_0", false, false, false, null);
channel.queueDeclare("testFanoutQueue_1", false, false, false, null);
channel.queueDeclare("testFanoutQueue_2", false, false, false, null);
// 绑定多个Queue
channel.queueBind("testFanoutQueue_0", "testFanoutExchange", "aaa");
channel.queueBind("testFanoutQueue_1", "testFanoutExchange", "bbb");
channel.queueBind("testFanoutQueue_2", "testFanoutExchange", "ccc");
// 此种类型的交换机会将消息发送到绑定的所有队列中，不会管设置的routing key
for (int i = 0; i < 1000; i++) {
channel.basicPublish("testFanoutExchange", "ddd", null, UUID.randomUUID().toString().getBytes());
}
channel.close();
}
private static void testTopic() throws Exception {
Channel channel = initChannel();
channel.exchangeDeclare("testTopicExchange", "topic", false);
channel.queueDeclare("testTopicQueue_0", false, false, false, null);
channel.queueDeclare("testTopicQueue_1", false, false, false, null);
// topic类型的exchange支持模式匹配
channel.queueBind("testTopicQueue_0", "testTopicExchange", "#.test");
channel.queueBind("testTopicQueue_1", "testTopicExchange", "aa.#");
channel.basicPublish("testTopicExchange", "aa.test", null, "aa.test".getBytes());
channel.basicPublish("testTopicExchange", "aa.bb", null, "aa.bb".getBytes());
channel.basicPublish("testTopicExchange", "6666.test", null, "6666.test".getBytes());
channel.close();
}
}
消费者
package test;
import com.rabbitmq.client.*;
public class ConsumerDemo {
public static void main(String[] args) throws Exception {
test();
}
private static Channel initChannel() throws Exception {
ConnectionFactory factory = new ConnectionFactory();
factory.setUsername("admin");
factory.setPassword("123");
factory.setHost("192.168.106.151");
factory.setVirtualHost("/");
factory.setPort(5672);
Connection connection = factory.newConnection();
return connection.createChannel();
}
private static void test() throws Exception {
Channel channel = initChannel();
// 设置客户端最多接受未被ack的消息的个数
channel.basicQos(64);
// 消费与交换机无关，直接消费队列
channel.basicConsume("testDirectQueue", true, "consumerTag", new DefaultConsumer(channel) {
@Override
public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
System.out.println("routing key: " + envelope.getRoutingKey());
System.out.println("content type: " + properties.getContentType());
System.out.println("message: " + new String(body));
// 如果服务端关闭了这里就ack不到
// channel.basicAck(envelope.getDeliveryTag(), false);
}
});
}
}
