rabbitmq mac 安装

RabbitMq安装

I. 安装

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brew install rabbitmq ## 进入安装目录 cd /usr/local/Cellar/rabbitmq/3.7.5 # 启动 brew services start rabbitmq # 当前窗口启动 rabbitmq-server

启动控制台之前需要先开启插件

1	./rabbitmq-plugins enable rabbitmq_management

进入控制台: http://localhost:15672/

用户名和密码：guest,guest

II. 配置与测试

1. 添加账号

首先是得启动mq

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## 添加账号 ./rabbitmqctl add_user admin admin ## 添加访问权限 ./rabbitmqctl set_permissions -p "/" admin ".*" ".*" ".*" ## 设置超级权限 ./rabbitmqctl set_user_tags admin administrator

2. 编码实测

pom引入依赖

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com.rabbitmq amqp-client

开始写代码

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public class RabbitMqTest { //消息队列名称 private final static String QUEUE_NAME = "hello"; @Test public void send() throws java.io.IOException, TimeoutException { //创建连接工程 ConnectionFactory factory = new ConnectionFactory(); factory.setHost("127.0.0.1"); factory.setPort(5672); factory.setUsername("admin"); factory.setPassword("admin"); //创建连接 Connection connection = factory.newConnection(); //创建消息通道 Channel channel = connection.createChannel(); //生成一个消息队列 channel.queueDeclare(QUEUE_NAME, true, false, false, null); for (int i = 0; i < 10; i++) { String message = "Hello World RabbitMQ count: " + i; //发布消息，第一个参数表示路由（Exchange名称），未""则表示使用默认消息路由 channel.basicPublish("", QUEUE_NAME, null, message.getBytes()); System.out.println(" [x] Sent '" + message + "'"); } //关闭消息通道和连接 channel.close(); connection.close(); } @Test public void consumer() throws java.io.IOException, java.lang.InterruptedException, TimeoutException { //创建连接工厂 ConnectionFactory factory = new ConnectionFactory(); factory.setHost("127.0.0.1"); factory.setPort(5672); factory.setUsername("admin"); factory.setPassword("admin"); //创建连接 Connection connection = factory.newConnection(); //创建消息信道 Channel channel = connection.createChannel(); //消息队列 channel.queueDeclare(QUEUE_NAME, true, false, false, null); System.out.println("[*] Waiting for message. To exist press CTRL+C"); AtomicInteger count = new AtomicInteger(0); //消费者用于获取消息信道绑定的消息队列中的信息 Consumer consumer = new DefaultConsumer(channel) { @Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException { String message = new String(body, "UTF-8"); try { System.out.println(" [x] Received '" + message); } finally { System.out.println(" [x] Done"); channel.basicAck(envelope.getDeliveryTag(), false); } } }; channel.basicConsume(QUEUE_NAME, false, consumer); Thread.sleep(1000 * 60); } }

需要注意的一点是：

• 生产消息: channel.queueDeclare(QUEUE_NAME, true, false, false, null);
• 消费消息: channel.queueDeclare(QUEUE_NAME, true, false, false, null);
• 生产和消费都声明channel，要求两者的配置参数一致，否则无法消费数据

3. 输出说明

首先执行塞入数据，执行完毕之后，可以到控制台进行查看:

可以看到多出了一个Queue，对列名为hello，总共有10条数据

---

接下来就是消费数据了，执行consumer方法，输出日志

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[*] Waiting for message. To exist press CTRL+C [x] Received 'Hello World RabbitMQ count: 0 [x] Done [x] Received 'Hello World RabbitMQ count: 1 [x] Done [x] Received 'Hello World RabbitMQ count: 2 [x] Done [x] Received 'Hello World RabbitMQ count: 3 [x] Done [x] Received 'Hello World RabbitMQ count: 4 [x] Done [x] Received 'Hello World RabbitMQ count: 5 [x] Done [x] Received 'Hello World RabbitMQ count: 6 [x] Done [x] Received 'Hello World RabbitMQ count: 7 [x] Done [x] Received 'Hello World RabbitMQ count: 8 [x] Done [x] Received 'Hello World RabbitMQ count: 9 [x] Done

回头去查看queue，发现总得数据量为0了

4. ACK问题

对于ack的问题，如果在消费数据的时候，出现异常，而我不希望数据丢失，这个时候就需要考虑手动ack的机制来保证了

首先需要设置手动ack

1 2	// 设置autoAck为false channel.basicConsume(QUEUE_NAME, false, consumer);

其次在消费数据完毕之后，主动ack/nack

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if (success) { channel.basicAck(envelope.getDeliveryTag(), false); } else { channel.basicNack(envelope.getDeliveryTag(), false, false); }