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                ## 使用java 發送單個消息的生產者,以及接收消息并將其打印出來的消費者。 發布者將連接到RabbitMQ,發送一條消息,然后退出。 ![](http://www.rabbitmq.com/img/tutorials/python-one.png =400x80) #### 1.添加maven的包 ``` <dependency> <groupId>com.rabbitmq</groupId> <artifactId>amqp-client</artifactId> <version>5.0.0</version> </dependency> ``` #### 2.編寫生產者者代碼 ``` public class Send { private final static String QUEUE_NAME = "hello"; public static void main(String[] argv) throws Exception { // 創建一個到服務器的連接 連接抽象出套接字連接,并為我們處理協議版本協商和認證等 ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); // 創建一個頻道 Channel channel = connection.createChannel(); // 申報隊列給我們發送->那么我們可以發布消息到隊列中 channel.queueDeclare(QUEUE_NAME, false, false, false, null); String message = "Hello World!"; // 聲明一個隊列是冪等的 - 只有當它不存在時才會被創建 - 消息內容是一個字節數組 channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8")); System.out.println(" [x] Sent '" + message + "'"); // 關閉渠道和連接 channel.close(); connection.close(); } } ``` #### 3.編寫消費者代碼 ``` public class Recv { private final static String QUEUE_NAME = "hello"; public static void main(String[] argv) throws Exception { ConnectionFactory factory = new ConnectionFactory(); factory.setHost("localhost"); Connection connection = factory.newConnection(); Channel channel = connection.createChannel(); channel.queueDeclare(QUEUE_NAME, false, false, false, null); System.out.println(" [*] Waiting for messages. To exit press CTRL+C"); 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"); System.out.println(" [x] Received '" + message + "'"); } }; channel.basicConsume(QUEUE_NAME, true, consumer); } } ``` ### 啟動順序 消費者將通過RabbitMQ打印從發布者處獲得的消息。消費者將繼續運行,等待消息。 1. 先啟動rabbirMq的服務器 2. 啟動消費者 3. 啟動生產者。 * * * * * #### rabbitMq服務器下載 [鏈接](http://www.rabbitmq.com/download.html) 登錄`http://localhost:15672/#/`可以查看服務消費等信息。 賬號密碼:guest
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