我有一个使用套接字进行服务器/客户端通信的简单程序。服务器类包含run()方法，该方法有无限循环等待套接字接受。
无论如何，我在构造函数中编写了一个代码来终止处理关闭，
this.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent windowEvent) {
System.out.println("Close operation server done");
toClient.println("Bye");
closeStreams();
socket = null;
serverSocket = null;
System.exit(0);
}
});
当我阅读该方法 windowClosing(WindowEvent e)的 API 时，它说：
当窗口正在关闭时调用。此时可以覆盖关闭操作。
它说当一个窗口正在关闭的过程中。但是 run() 方法内部的循环仍然获得控制权，由于程序的逻辑，不会结束，所以不会关闭窗口（实际上是关闭了 GUI），但处理仍在幕后进行。
如何正确强制程序运行？
整个工作服务器类：
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.*;
import java.net.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
public class ChatServer extends JFrame
{
private InetAddress serverAddress;
private Socket socket;
private ServerSocket serverSocket;
private InputStream is;
private OutputStream os;
private BufferedReader fromClient;
private PrintWriter toClient;
private JButton send;
private JPanel uperPanel;
private JPanel midPanel;
private JPanel downPanel;
private JTextArea textToSend;
private JTextArea textToReceive;
private JLabel addressL;
private final int port = 5555;
private boolean idle = false;
private int timeout = 3000;
public static String newline = System.getProperty("line.separator");
private ChatServer()
{
this.setGUI();
this.setVisible(true);
try
{
serverSocket = new ServerSocket(port);
this.run();
} catch (IOException ex)
{
Logger.getLogger(ChatServer.class.getName()).log(Level.SEVERE, null, ex);
}
this.addWindowListener(new java.awt.event.WindowAdapter()
{
@Override
public void windowClosing(java.awt.event.WindowEvent windowEvent)
{
idle = true;
closeStreams();
socket = null;
serverSocket = null;
System.exit(0);
}
});
}
public void run() throws IOException
{
try
{
while (true)
{
System.out.println("System is running");
socket = serverSocket.accept();
System.out.println("Client accepted on server side");
openStreams();
toClient.println("Hello: server is connected " + serverAddress.getLocalHost().toString());
processClient();
// closeStreams();
}
} catch (java.net.SocketTimeoutException ee)
{
closeStreams();
System.out.println(ee);
} catch (Exception e)
{
System.out.println("Error accepting server " + e);
}
}
public void processClient() throws IOException
{
System.out.println("Porcessing start");
String line = fromClient.readLine();
try
{
while (!(line.equals("Bye")))
{
textToReceive.append("He: " + line + newline);
line = fromClient.readLine();
}
closeStreams();
} catch (IOException ex)
{
System.out.println("Error reading from client " + ex);
}
}
private void setGUI()
{
this.setSize(375, 314);
send = new JButton("send");
try
{
addressL = new JLabel("My Server address: " + serverAddress.getLocalHost().toString()
+ " Port: " + this.port);
} catch (Exception e)
{
System.out.println("Unknown Host problem " + e);
}
textToReceive = new JTextArea(12, 30);
textToReceive.setLineWrap(true);
JScrollPane recievedScrolledText = new JScrollPane(textToReceive);
recievedScrolledText.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
textToReceive.setEditable(false);
textToSend = new JTextArea(3, 25);
textToSend.setLineWrap(true);
JScrollPane sentScrolledText = new JScrollPane(textToSend);
sentScrolledText.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
textToSend.setEditable(true);
uperPanel = new JPanel();
midPanel = new JPanel();
downPanel = new JPanel();
uperPanel.add(addressL);
midPanel.add(recievedScrolledText);
downPanel.add(sentScrolledText);
downPanel.add(send);
Container c = getContentPane();
c.setLayout(new BorderLayout());
c.add(uperPanel, "North");
c.add(midPanel, "Center");
c.add(downPanel, "South");
send.addActionListener(new ButtonWatch());
textToSend.addKeyListener(new KeyWatch());
}
private void openStreams() throws IOException
{
is = socket.getInputStream();
fromClient = new BufferedReader(new InputStreamReader(is));
os = socket.getOutputStream();
toClient = new PrintWriter(os, true);
System.out.println("open stream is open on server");
}
private void closeStreams()
{
try
{
if ((toClient != null) && (os != null)
&& (fromClient != null) && (is != null)
&& (fromClient != null) && (socket != null))
{
toClient.close();
os.close();
fromClient.close();
is.close();
socket.close();
}
} catch (IOException ex)
{
System.out.println("Problem closing streams " + ex);
}
}
private class KeyWatch extends KeyAdapter
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
String line = textToSend.getText();
textToSend.setText("");
toClient.println(line);
textToReceive.append("You: " + line + newline);
}
}
public void keyReleased(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
}
}
public void keyTyped(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
}
}
}
private class ButtonWatch implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
Object buttonPressed = e.getSource();
if (buttonPressed == send)
{
String line = textToSend.getText();
textToSend.setText("");
toClient.println(line);
textToReceive.append("You: " + line + newline);
System.out.println("send to client " + line);
}
}
}
public static void main(String[] args)
{
ChatServer s = new ChatServer();
s.setVisible(true);
}
}
现在如何在单击 (x) 关闭图标后正确终止它。