Java实现多线程处理队列请求通信:客户端线程向请求队列中不断发生请求,服务器端线程不断处理请求队列中请求。
一个线程(ClientThread)对另一线程(ServerThread)传递请求(request)的实例。实现简单的线程沟通。
设计如下:
Request:请求类,存储请求信息的类。
RequestQueue:请求队列类,接受存储请求的队列类。
ClientThread:发送请求的线程类,负责向请求队列中发送请求。
ServerThread:处理请求的线程类,负责向请求队列中取请求处理。
Mian:程序入口

Request:请求类,存储发生信息的类。

package com.single.queue;

/**
 * 
 * @author Administrator
 * 请求类
 */
public class Request {

	/**
	 * 请求名称
	 */
	private final String name;

	public Request(String name){
		this.name = name;
	}

	public String getName(){
		return name;
	}

	public String toString(){
		return "{Request."+name+"}";
	}

}

Request类中只存放了请求的名字信息。

RequestQueue:请求队列,用例存放请求的队列类。

package com.single.queue;

import java.util.LinkedList;

/**
 * 
 * @author Administrator
 *	请求队列
 */
public class RequestQueue {

	/**
	 * 请求队列
	 */
	private final LinkedList<Request> queue = new LinkedList<Request>();

	/**
	 * 同步取出队列中的请求
	 * @return
	 */
	public synchronized Request getRequest(){
		while(queue.size()<=0){
			try {
				System.out.println("{getRequest wait}");
				wait(); //如果队列为空,则当前线程进入等待池中
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		Request request = queue.removeFirst();
		System.out.println(Thread.currentThread().getName()+" getRequest "+request);
		return request;
	}

	/**
	 * 同步向队列中加入请求
	 * @param request
	 */
	public synchronized void putRequest(Request request){
		queue.addLast(request);
		System.out.println(Thread.currentThread().getName()+" putRequest "+request);
		notifyAll(); //队列中加入请求后,换醒等待线程处理请求
	}

}

RequestQueue类用来存放请求的类,这个类拥有putRequest和getRequest两个方法;

putRequest方法是实现将请求(request)存放到请求队列中(requestQueue),客户端线程会调用此方法来发生请求并保持到请求队列中。

getRequest方法是实现将请求(request)从请求队列中(requestQueue)中取出,服务器端线程就会调用此方法将请求队列中的请求取出并处理。

ClientThread:客户端线程,发送请求的线程类。

package com.single.queue;

import java.util.Random;

/**
 * 
 * @author Administrator
 *	客户端线程负责发送请求
 */
public class ClientThread extends Thread{

	/**
	 * 请求队列
	 */
	private RequestQueue requestQueue;
	/**
	 * client名称
	 */
	private String name;

	public ClientThread(String name, RequestQueue queue){
		super("client."+name);
		this.name = name;
		this.requestQueue = queue;
	}

	/**
	 * 循环加入多个请求
	 */
	public void run(){
		for (int i = 0; i < 10; i++) {
			Request request = new Request(name+"."+i);
			requestQueue.putRequest(request);
			try {
				Thread.sleep(new Random().nextInt(1010));
			} catch (InterruptedException e) {
				e.printStackTrace();
			}

		}
	}

}

ServerThread:服务器端线程,处理请求的线程类

package com.single.queue;

import java.util.Random;

/**
 * 
 * @author Administrator
 *	服务线程负责处理请求
 */
public class ServerThread extends Thread{

	/**
	 * 请求队列
	 */
	private RequestQueue requestQueue;

	public ServerThread(String name,RequestQueue queue){
		super("server."+name);
		this.requestQueue = queue;
	}

	/**
	 * 循环取出请求
	 */
	public void run(){
		for (int i = 0; i < 10; i++) {
			requestQueue.getRequest();
			try {
				Thread.sleep(new Random().nextInt(1000));
			} catch (InterruptedException e) {
				e.printStackTrace();
			}

		}
	}

}

Main:main程序执行入口

package com.single.queue;

/**
 * 
 * @author Administrator
 *	main
 */
public class Main {

	/**
	 * 客户端线程请求向队列中不断发送请求,服务器端线程不断处理请求。
	 * @param args
	 */
	public static void main(String[] args) {
		RequestQueue queue = new RequestQueue();
		new ClientThread("a",queue).start();
		new ServerThread("a",queue).start();
	}

}

执行结果:

client.a putRequest {Request.a.0}
server.a getRequest {Request.a.0}
client.a putRequest {Request.a.1}
server.a getRequest {Request.a.1}
{getRequest wait}
client.a putRequest {Request.a.2}
server.a getRequest {Request.a.2}
client.a putRequest {Request.a.3}
server.a getRequest {Request.a.3}
{getRequest wait}
client.a putRequest {Request.a.4}
server.a getRequest {Request.a.4}
{getRequest wait}
client.a putRequest {Request.a.5}
server.a getRequest {Request.a.5}
{getRequest wait}
client.a putRequest {Request.a.6}
server.a getRequest {Request.a.6}
client.a putRequest {Request.a.7}
client.a putRequest {Request.a.8}
server.a getRequest {Request.a.7}
server.a getRequest {Request.a.8}
{getRequest wait}
client.a putRequest {Request.a.9}
server.a getRequest {Request.a.9}

上面了列子只是一个单线程与单线程通信的列子,如果我们想要看多个线程与多个线程通信,则只需要修改main方法就可以实现:

public static void main(String[] args) {
		RequestQueue queue = new RequestQueue();
		new ClientThread("a",queue).start();
		new ServerThread("a",queue).start();
		new ClientThread("b",queue).start();
		new ServerThread("b",queue).start();
	}

修改后的执行结果如下:

client.a putRequest {Request.a.0}
client.b putRequest {Request.b.0}
server.a getRequest {Request.a.0}
server.b getRequest {Request.b.0}
{getRequest wait}
client.a putRequest {Request.a.1}
server.a getRequest {Request.a.1}
client.b putRequest {Request.b.1}
server.a getRequest {Request.b.1}
{getRequest wait}
client.a putRequest {Request.a.2}
server.b getRequest {Request.a.2}
{getRequest wait}
{getRequest wait}
client.b putRequest {Request.b.2}
server.a getRequest {Request.b.2}
{getRequest wait}
{getRequest wait}
client.b putRequest {Request.b.3}
server.a getRequest {Request.b.3}
{getRequest wait}
{getRequest wait}
client.a putRequest {Request.a.3}
server.a getRequest {Request.a.3}
{getRequest wait}
client.a putRequest {Request.a.4}
server.b getRequest {Request.a.4}
client.b putRequest {Request.b.4}
server.b getRequest {Request.b.4}
client.a putRequest {Request.a.5}
client.a putRequest {Request.a.6}
server.a getRequest {Request.a.5}
……