Java 线程，从主 JFrame GUI 关闭服务器线程

Question

我有一个程序启动一个被动服务器，为每个到服务器套接字的连接生成一个连接处理程序。我想找到一种 Eloquent 方法来关闭服务器套接字并释放端口。目前，我不确定如何中断 Socket.accept 方法。我一直在使用同步方法在另一个线程中设置标志，但是 Socket.accpet 会阻塞，直到建立连接。

我的被动服务器代码

package NetSecConsole;

import java.io.*;
import java.net.*;
import javax.swing.SwingUtilities;


public class PassiveServer implements Runnable
{
    Thread runner;
    int port = 20000;
    MainFrame mainFrame;
    ServerSocket s = null;

    public PassiveServer(MainFrame mf, int hostPort) 
    {
        mainFrame = mf;
        port = hostPort;
        try 
        {
            s = new ServerSocket(hostPort);
        } 
        catch (Exception e) 
        {
            newStatus("Server [Constructor]: Could not open server socket! " + e);
        }
    }

    public void start() 
    {
        if (runner == null) 
        {
            runner = new Thread(this);
            runner.start();
        } 
    }

    @Override
    public void run() 
    {
        try 
        {
            int connCount = 1;
            for (;;) 
            {
                // Sit and wait for a connection
                newStatus("Server [run]: Waiting for connection to port " + Integer.toString(port) + "...");
                Socket incomingConnection =  s.accept();

                // Pass the connection off to a connection handler thread
                newStatus("Server [run]: Got connection on port " + Integer.toString(port));
                final ConnectionHandler conHand = new ConnectionHandler(mainFrame, incomingConnection, connCount); 

                // Start the connection handler, then continue;
                conHand.start();
                connCount++;
            } 
        } 
        catch (IOException e) 
        {
            newStatus("Server [run]: IOException: "  + e);
        }
    }

    public final void newStatus(final String arg)
    {
        Runnable sendMsg = new Runnable() 
        {
            @Override
            public void run() 
            {
                    mainFrame.newStatusLine(arg);
            }
        };
        SwingUtilities.invokeLater(sendMsg);
    }

 }

Answer 1

如果您不想通过关闭监听套接字来强制异常(这是完美的 IME)，则设置一个 volatile boolean “关闭”标志，该标志在每次 accept() 返回后进行检查。然后通过打开本地主机客户端连接使accept() 调用返回。