簡單的模擬了一個訊息佇列

Producer：生產者

Consumer：消費者

Message：訊息體

    import java.util.concurrent.ArrayBlockingQueue;
    import java.util.concurrent.BlockingQueue;

    public class Test4 {
        public static void main(String[] args) {
            BlockingQueue<Message> blockingQueue = new ArrayBlockingQueue<Message>(10
 
);
            Producer producer = new Producer(blockingQueue);

            //啟動一個消費者
            Consumer consumer = new Consumer(blockingQueue);
            Thread consumerThread = new Thread(consumer);
            consumerThread.start();

            int n = 0;
            //模擬生產者發訊息
            while
 
 (true){
                Message message = new Message();
                message.setTopic("hello("+n+")");
                message.setBody("nice to meet you("+n+")");
                System.out.println("傳送訊息:"+message.toString());
                producer.send(message);
                n++;
                try
 
 {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    class Producer{
        private BlockingQueue<Message> messageQueue;
        private volatile  Message message;
        public Message getMessage() {
            return message;
        }

        public void setMessage(Message message) {
            this.message = message;
        }


        public Producer(BlockingQueue<Message> messageQueue){
            this.messageQueue = messageQueue;
        }

        public void send(Message message){
            try {
                this.messageQueue.put(message);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    class Consumer implements Runnable{
        private volatile Message message;
        private String topic;
        public String getTopic() {
            return topic;
        }

        public void setTopic(String topic) {
            this.topic = topic;
        }
        private BlockingQueue<Message> blockingQueue;
        public Consumer(BlockingQueue<Message> blockingQueue){
            this.blockingQueue = blockingQueue;
        }

        @Override
        public void run() {
            while (true) {
                if (!blockingQueue.isEmpty()) {
                    try {
                        System.out.println("收到訊息:" + blockingQueue.take().toString());
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

    }
    class Message {
        private String topic;
        private String body;

        public String getTopic() {
            return topic;
        }

        public void setTopic(String topic) {
            this.topic = topic;
        }

        public String getBody() {
            return body;
        }

        public void setBody(String body) {
            this.body = body;
        }

        @Override
        public String toString() {
            return "{topic:" + topic + ",body:" + body + "}";
        }

    }