[英]Java threading, shutting down a server thread from a main JFrame GUI
I have a program that starts up a passive server that spawns a connection handler for each connection to the server socket. 我有一个程序可以启动一个被动服务器,该服务器为与服务器套接字的每个连接生成一个连接处理程序。 I would like to find an eloquent way to shutdown the server socket and release the port.
我想找到一种雄辩的方法来关闭服务器套接字并释放端口。 Currently, I am not sure how to interrupt the
Socket.accept
method. 当前,我不确定如何中断
Socket.accept
方法。 I have been using a synchronized method to set a flag in another Thread, but Socket.accpet
blocks until a connection is made. 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
阻塞,直到建立连接为止。
My passive server code 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);
}
}
If you don't want to force an exception by closing the listening socket, (which is perfectly fine IME), then set a volatile boolean 'shutdown' flag that that is checked after every accept() return. 如果您不想通过关闭监听套接字(这是很好的IME)来强制执行异常,则设置一个易失的布尔值'shutdown'标志,该标志在每次accept()返回之后都会进行检查。 Then make the accept() call return by opening a localhost client connection.
然后,通过打开localhost客户端连接,使accept()调用返回。
You can call interrupt
on the server/background thread or close
您可以在服务器/后台线程上调用
interrupt
或close
on the server socket. 在服务器套接字上。 I didn't know about the latter, just Googled it.
我不知道后者,只是用谷歌搜索。
See also: 也可以看看:
How to terminate a thread blocking on socket IO operation instantly? 如何立即终止套接字IO操作上的线程阻塞?
You can call close() on the ServerSocket. 您可以在ServerSocket上调用close()。 The pending accept call(s) with throw a SocketException, so you can trap that for a clean exit.
待处理的接受调用将引发SocketException,因此您可以将其捕获以进行干净退出。
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