Question

我写了一个简单的服务器。我何时运行此服务器然后立即在浏览器中使用uri localhost：7777打开3个选项卡我希望按请求进行线程，在我的情况下它是3 同时线程（每个线程同时启动并在大约相同的时间死亡）。

但我在控制台输出中看到第一个线程从0开始（本地分钟）：11（本地秒）然后第二个线程从0:11开始但是在读取循环块时停止（为什么？它不是独立线程？）并且只有在第一个线程唤醒（0:16）后才恢复执行第三个线程仅在第二个线程死亡时运行（0:21）。

我期待以下时间：

Connected with Thread-1 0:11 
Connected with Thread-2 0:11 
Connected with Thread-3 0:11 
Disconnect with Thread-1 0:16
Disconnect with Thread-2 0:16
Disconnect with Thread-3 0:16

我错过了什么？为什么第二个线程等待第一个线程唤醒和第三个线程只在第二个线程死亡后才开始？

public class Starter {

    public static void main(String args[]){

    int port = 7777;
        try {

            final ServerSocket socket = new ServerSocket(port);
            new Thread(new ThreadPool(socket)).start();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}




public class ThreadPool implements Runnable{

protected ServerSocket socket;

public ThreadPool(ServerSocket socket){
    this.socket = socket;
}

@Override
public void run() {

    final ExecutorService executors = Executors.newCachedThreadPool();

    while(true){
        try {
            final Socket acceptedSocket = this.socket.accept();
            //executors.execute(new ThreadWork(acceptedSocket));
            new Thread(new ThreadWork(acceptedSocket)).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
}



public class ThreadWork implements Runnable {

protected final Socket clientSocket;

public ThreadWork(Socket clientSocket){
    this.clientSocket = clientSocket;
}

@Override
public void run() {
    try {
        System.out.println("Connected with " + java.lang.Thread.currentThread().getName() + " " + ((System.currentTimeMillis() / 1000*60) % 60) + ":" + ((System.currentTimeMillis() / 1000) % 60));
        System.out.println("   " + clientSocket.toString());

        InputStream sin = clientSocket.getInputStream();
        OutputStream sout = clientSocket.getOutputStream();

        BufferedReader in = new BufferedReader(new InputStreamReader(sin));
        OutputStreamWriter out = new OutputStreamWriter(sout);

        String line =
                "HTTP/1.1 200 OK\n"  +
                        "Date: Thu, 19 Feb 2009 12:27:04 GMT\n"       +
                        "Server: Apache/2.2.3\n"                         +
                        "Last-Modified: Wed, 18 Jun 2003 16:05:58 GMT\n"       +
                        "Content-Type: text/html\n"             +
                        "Content-Length: 115\n"      +
                        "Accept-Ranges: bytes\n"      +
                        "Connection: close\n"  +
                        "\r\n" +
                        "<html><head><title>Hello</title></head><body>It Works!</body></html>\n";

        String requestLine;

        System.out.println("      Before reading " + java.lang.Thread.currentThread().getName() + " " + ((System.currentTimeMillis() / 1000*60) % 60) + ":" + ((System.currentTimeMillis() / 1000) % 60));
        while((requestLine = in.readLine()) != null) {
            if(requestLine.isEmpty()){
                break;
            }
        }
        System.out.println("         Asleep " + java.lang.Thread.currentThread().getName());
        java.lang.Thread.sleep(5000);
        System.out.println("         Awake " + java.lang.Thread.currentThread().getName());
        out.write(line);
        out.flush();
    }
    catch (InterruptedException e) {
        e.printStackTrace();
    }
    catch (IOException e) {
        e.printStackTrace();
    }
    finally {
        try {
            clientSocket.close();
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
        System.out.println("Disconnect with " + java.lang.Thread.currentThread().getName() + " " + ((System.currentTimeMillis() / 1000*60) % 60) + ":" + ((System.currentTimeMillis() / 1000) % 60));
    }
}
}

节目输出

Connected with Thread-1 0:11
   Socket[addr=/0:0:0:0:0:0:0:1,port=45416,localport=7777]
      Before reading Thread-1 0:11
         Asleep Thread-1
Connected with Thread-2 0:11
   Socket[addr=/0:0:0:0:0:0:0:1,port=45419,localport=7777]
      Before reading Thread-2 0:11
         Awake Thread-1
Disconnect with Thread-1 0:16
         Asleep Thread-2
         Awake Thread-2
Disconnect with Thread-2 0:21
Connected with Thread-3 0:21
   Socket[addr=/0:0:0:0:0:0:0:1,port=45424,localport=7777]
      Before reading Thread-3 0:21
         Asleep Thread-3
         Awake Thread-3
Disconnect with Thread-3 0:26

Answer 1

据我所知，您的代码没有任何问题。但是，同样的事情发生在我身上，所以我尝试用tcpdump监控网络流量时自己运行它，看起来它只是浏览器玩弄技巧，而不是代码。

我正在使用Chromium，它只是在第一个请求完成之前不发送第二个请求，在此之前它甚至都没有连接第三个请求。我猜它是试图通过不重载它或某事来对服务器友善。

意外的多线程结果和时序

1 个答案: