通过Java Socket发送对象真的很慢 [英] Sending Objects over Java Socket really slow

问题描述

我无法弄清楚为什么带有 Socket 和 ServerSocket 的Java Server在发送对象时这么慢。这里有一个小的ping程序来演示我的问题。如果我在同一台计算机上同时运行客户端和服务器，则一切正常（ping时间小于1毫秒）。但是，如果我将服务器移至Linux机器，则ping时间> 500毫秒（通过命令行对该机器执行ping操作表示20毫秒）。

I can't figure out why my Java Server with Socket and ServerSocket is that slow while sending objects. Here a small ping program to demonstrate my problem. If I run both client and server on the same machine, everything is fine ofc (<1ms ping time). However, if I move the Server to a Linux machine I get a ping time of >500ms (ping via command line to that machine says 20ms).

谢谢预先

服务器：

public static void main(String[] args) {
    try {
        ServerSocket serverSocket = new ServerSocket(Integer.parseInt(args[0]));
        Socket socket = serverSocket.accept();

        ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());

        oos.writeObject(System.currentTimeMillis());
        long time = (long)ois.readObject();

        System.out.println(System.currentTimeMillis()-time+" ms");

    } catch (Exception e) {
        System.out.println("Some error occured");
        System.exit(1);
    }
}

客户：

public static void main(String[] args) {
    try {
        Socket socket = new Socket(args[0], Integer.parseInt(args[1]));

        ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
        ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());

        long time = (long)ois.readObject();
        oos.writeObject(time);

    } catch (Exception e) {
        System.out.println("Some error occured");
        System.exit(1);
    }
}

推荐答案

I环顾了一下网络，您不是唯一遇到此问题的人。这篇帖子也描述了相同的问题，

I looked around the web a bit and you are not the only person with this problem. This post also describes the same issue,

基本上，您应该执行以下操作：

Basically, what you should do is instead of:

ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());

您应输入：

ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(socket.getOutputStream()));
ObjectInputStream ois = new ObjectInputStream(new BufferedInputStream(socket.getInputStream()));

周期性地，您会这样写：

And periodically you would write:

oos.flush();//Write after you send data

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