java 和 web socket 中的 TimerTask

发布于 2025-01-02 22:59:33 字数 307 浏览 4 评论 0原文

我正在尝试使用 Java 的 DatagramSocket 和 DatagramPacket 类编写一个基本的客户端服务器。我已经设置了基本代码，但我想要一种定期从客户端向服务器发送 100 条消息的方法，即 1 秒、2 秒或 5 秒。

基本上，我想要这样的东西：

while (count != 0)
sleep (1);
create message packet;
send message packet;
count--;

在C中有一个sleep方法，但我不知道如何在java中做到这一点。有人有什么建议吗？

原文

I'm trying to write a basic client server using Java's DatagramSocket and DatagramPacket classes. I have the basic code set up, but I want a way to send 100 messages from my Client to my Server at regular intervals i.e. 1 sec, or 2 sec, or 5 sec.

Basically, I want something like:

while (count != 0)
sleep (1);
create message packet;
send message packet;
count--;

In C there's a sleep method, but I'm not sure how to do that in java. Anyone have any suggestions?

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酒与心事 2025-01-09 22:59:33

您始终可以调用 Thread.sleep()，它很大程度上相当于 C 中的 sleep 函数。但我会推荐一种替代方法来完成您的程序。看一下 ScheduledThreadPoolExecutor 类，它允许您安排一段代码定期运行：

Runnable myCommand = new Runnable() {
    public void run() {
        // Do some work
    }
};

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(4);
// Execute the command every second = 1000 milliseconds
executor.scheduleAtFixedRate(myCommand, 0, 1000, TimeUnits.MILLISECONDS);

You can always call Thread.sleep(), which is largely equivalent to the sleep function from C. But I would recommend an alternative route to accomplishing your program. Take a look at the ScheduledThreadPoolExecutor class, it allows you to schedule a piece of code to be run at regular intervals:

Runnable myCommand = new Runnable() {
    public void run() {
        // Do some work
    }
};

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(4);
// Execute the command every second = 1000 milliseconds
executor.scheduleAtFixedRate(myCommand, 0, 1000, TimeUnits.MILLISECONDS);

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丑疤怪 2025-01-09 22:59:33

Timer timer = new Timer();
timer.schedule(new Task(), 1000); //schedule the task to be run at 1 second (1000 mili sec) time

这是任务类的代码

class Task extends TimerTask
{
    Task()
    {
    }

    public void run()
    {
        //create datagram socket
        //create datagram packet
        //send the packet
    }
}

Timer timer = new Timer();
timer.schedule(new Task(), 1000); //schedule the task to be run at 1 second (1000 mili sec) time

Here is the code for Task class

class Task extends TimerTask
{
    Task()
    {
    }

    public void run()
    {
        //create datagram socket
        //create datagram packet
        //send the packet
    }
}

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将军与妓 2025-01-09 22:59:33

Java 比 C 水平相当高。（当然你也有 C 中的线程库:)，我的意思是这是作为 Java 语言支持而不是库来支持的）

所以，你可以使用 Timer 类。

来到主要功能，您将

DatagramSocket socket = new DatagramSocket();
byte[] buf = new byte[256];
InetAddress address = InetAddress.getByName("sample-address");
DatagramPacket packet = new DatagramPacket
                    (buf, buf.length, 
                    address, 4445);
socket.send(packet);

在该类中实现类似 TimerTask 的内容。

必须重写那里的运行方法。

Java is pretty high level than C. (of course you have thread libs in C too :), what I meant this is supported as Java language support than libraries)

So, you can use Timer class.

Coming to the main functionality you will have something like

DatagramSocket socket = new DatagramSocket();
byte[] buf = new byte[256];
InetAddress address = InetAddress.getByName("sample-address");
DatagramPacket packet = new DatagramPacket
                    (buf, buf.length, 
                    address, 4445);
socket.send(packet);

In that class implementing TimerTask.

Have to override a run method there.

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