概念

簡單例子

其實和簡單入手的例子幾乎差不多 我們先建立好work_queues佇列

編寫兩個消費者類等待消費

public class WorkConsumer {
    public static void main(String[] args) {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.198.129");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        connectionFactory.setVirtualHost("/");
        Connection connection = null;
        Channel channel = null;
        try {
            //建立連線
            connection = connectionFactory.newConnection("消費者");
            //獲取通道
            channel = connection.createChannel();
            //通過通道宣告佇列,建立交換機等一系列事情
            channel.basicConsume("work_queues", true, new DeliverCallback() {
                @Override
                public void handle(String s, Delivery delivery) throws IOException {
                    System.out.println("收到訊息為" + new String(delivery.getBody(), "UTF-8"));
                }
            }, new CancelCallback() {
                @Override
                public void handle(String s) throws IOException {
                    System.out.println("收取訊息失敗");
                }
            });
            //卡一下
            System.out.println("鍵盤輸入關閉消費者");
            System.in.read();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        }
        finally {
            //關閉通道
            if(channel != null && channel.isOpen()){
                try {
                    channel.close();
                }
                catch (Exception e){
                    e.printStackTrace();
                }
            }

            if(connection != null && connection.isOpen()){
                try {
                    connection.close();
                }
                catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }
}
 

再寫一個程式碼完全一致的類執行 即出現兩個消費者

編寫生產者類 生產一定數量的訊息

public class WorkProducer {
    public static void main(String[] args) {
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.198.129");
        connectionFactory.setPort(5672);
        connectionFactory.setUsername("admin");
        connectionFactory.setPassword("admin");
        connectionFactory.setVirtualHost("/");
        Connection connection = null;
        Channel channel = null;
        try {
            //建立連線
            connection = connectionFactory.newConnection("生產者");
            //獲取通道
            channel = connection.createChannel();
            //通過通道宣告佇列,建立交換機等一系列事情
            String queueName = "work_queues";
            //引數:佇列名字 是否持久化 是否獨自 是否自動刪除 引數
            channel.queueDeclare(queueName,false,false,false,null);
            for (int i = 0; i < 10; i++) {
                String message = i+"Hello rabbitmq";
                channel.basicPublish("",queueName,null,message.getBytes());
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TimeoutException e) {
            e.printStackTrace();
        }
        finally {
            //關閉通道
            if(channel != null && channel.isOpen()){
                try {
                    channel.close();
                }
                catch (Exception e){
                    e.printStackTrace();
                }
            }

            if(connection != null && connection.isOpen()){
                try {
                    connection.close();
                }
                catch (Exception e){
                    e.printStackTrace();
                }
            }
        }
    }
}
 

先執行兩個消費者 然後執行生產者
可以看到生產的訊息被兩個消費者大致平均的取走了