用java实现的生产者与消费者多线程同步互斥模型

生产者与消费者模型中，要保证以下几点：
 （1）同一时间内只能有一个生产者生产。
 （2）同一时间内只能有一个消费者消费。
 （3）生产者生产的同时消费者不能消费。
 （4）消息队列满时生产者不能继续生产，消息队列空时消费者不能继续消费，此时必须等待。

代码：

1、Message.java

package com.test; /** * 消息对象 * */ public class Message { private int id; private String message; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } }

2、Queue.java

 package com.test; import java.util.ArrayList; import java.util.List; /** * 存放消息的缓存队列,共享资源 * */ public class Queue { private List list = new ArrayList(); private int maxCount = 5; /** * 生产 * @param message */ public synchronized void product(Message message){ this.notifyAll(); while (maxCount == getList().size()) { System.out.println(Thread.currentThread().getName()+"，队列已满，等待中。。。。"); try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } getList().add(message); System.out.println(Thread.currentThread().getName()+",正在生产。。。队列当前个数:"+getList().size()); } /** * 消费 */ public synchronized void consume(){ this.notifyAll(); while(getList().size()==0){ System.out.println(Thread.currentThread().getName()+"，队列为空，等待中。。。"); try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } Message message = getList().get(0); getList().remove(message); System.out.println(Thread.currentThread().getName()+",正在消费。。。队列当前个数:"+getList().size()); } public List getList() { return list; } public void setList(List list) { this.list = list; } public int getMaxCount() { return maxCount; } public void setMaxCount(int maxCount) { this.maxCount = maxCount; } }

3、Producer.java

package com.test; import java.util.Random; /** * 生产者生产 * */ public class Producer implements Runnable { private Queue queue = null; public Producer(Queue queue) { this.queue = queue; } public void run() { while (true) { Message message = new Message(); message.setId(new Random().nextInt()); message.setMessage("message," + new Random().nextInt()); queue.product(message); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } }

4、Consumer .java

package com.test; /** * 消费者消费 * */ public class Consumer implements Runnable { private Queue queue; public Consumer(Queue queue) { this.queue = queue; } public void run() { while (true) { queue.consume(); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } }

5、Test.java

package com.test; public class Test { public static void main(String[] args) { Queue queue = new Queue(); // 生产者两个 Producer producer1 = new Producer(queue); Producer producer2 = new Producer(queue); // 消费者三个 Consumer consumer1 = new Consumer(queue); Consumer consumer2 = new Consumer(queue); Consumer consumer3 = new Consumer(queue); Thread thread1 = new Thread(producer1,"producer1"); Thread thread2 = new Thread(producer2,"producer2"); Thread thread3 = new Thread(consumer1,"consumer1"); Thread thread4 = new Thread(consumer2,"consumer2"); Thread thread5 = new Thread(consumer3,"consumer3"); thread1.start(); thread2.start(); thread3.start(); thread4.start(); thread5.start(); } }