OutputStream卡住了？

Question

我对文件传输系统有一点问题，以前从未发生过。

@Override
    public void run()
    {
        while (true)
        {
            try
            {
                String message = (String) new ObjectInputStream(socket.getInputStream()).readObject();
                if (message.startsWith("message="))
                {
                    message = message.replaceFirst("message=", "");
                    frame.addLine(message);
                }
                else if (message.startsWith("file="))
                {
                    final String file = message.replaceFirst("file=", "");
                    int selection = JOptionPane.showOptionDialog(frame, "Do you want to download \"" + file + "\"?", "Download", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, JOptionPane.YES_OPTION);
                    if (selection == JOptionPane.YES_OPTION)
                    {
                        JFileChooser jFileChooser = new JFileChooser();
                        jFileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

                        int rValue = jFileChooser.showDialog(frame, "Öffnen");

                        if (rValue == JFileChooser.APPROVE_OPTION)
                        {
                            new ObjectOutputStream(socket.getOutputStream()).writeObject("file_confirm=" + file);

                            String selectedDir = jFileChooser.getSelectedFile().getAbsolutePath();

                            OutputStream out = new FileOutputStream(new File(selectedDir, file));

                            try
                            {

                                byte[] buffer = new byte[1024];

                                for (int c = 0; (c = socket.getInputStream().read(buffer)) > 0;)
                                {
                                    out.write(buffer, 0, c);
                                    System.out.println(c);
                                }

                                System.out.println("test1");

                            }
                            catch (Exception ex)
                            {
                                ex.printStackTrace();
                            }
                            finally
                            {
                                System.out.println("test2");
                                out.flush();
                                out.close();
                                System.out.println("test3");
                            }
                        }
                    }
                }
                else if (message.startsWith("kick()"))
                {
                    frame.setVisible(false);
                    frame.dispose();
                    JOptionPane.showMessageDialog(frame, "You have been kicked!", "Error", JOptionPane.ERROR_MESSAGE);
                    System.exit(0);
                }
                else if (message.startsWith("clear()"))
                {
                    frame.clear();
                }
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
                frame.setVisible(false);
                frame.dispose();
                JOptionPane.showMessageDialog(frame, "Connection timed out!", "Error", JOptionPane.ERROR_MESSAGE);
                System.exit(0);
            }
        }

    }

打印出来（文件大小为31 KB）：

大约30倍1024（正如预期的那样）

382

4

10

4

10

4

10

----- 4和10一直持续到我终止应用程序-----

无论我使用什么文件，它总是重复这个4和10。所以我自己发现了问题，它陷入了for-loop，但为什么呢？

---

如果您遇到同样的问题，我只想告诉您有两种解决方法。

下面的anwser

2. 一个简单的

   if（c

也会修复它

Answer 1

如果你想从单独的线程中摆动操作，你就可以使线程安全。使其线程安全使用

EventQueue.invokeLater(new Runnable() {

            public void run() {
               //put  your swing operation here
            }
        });



EventQueue.invokeLater(new Runnable() {

                        public void run() {
                            int selection = JOptionPane.showOptionDialog(frame,
                                    "Do you want to download \"" + file + "\"?",
                                    "Download", JOptionPane.YES_NO_OPTION,
                                    JOptionPane.QUESTION_MESSAGE, null, null,
                                    JOptionPane.YES_OPTION);
                            if (selection == JOptionPane.YES_OPTION) {
                                JFileChooser jFileChooser = new JFileChooser();
                                jFileChooser
                                        .setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

                                int rValue = jFileChooser.showDialog(frame, "Öffnen");

                                if (rValue == JFileChooser.APPROVE_OPTION) {
                                    new ObjectOutputStream(socket.getOutputStream())
                                            .writeObject("file_confirm=" + file);

                                    String selectedDir = jFileChooser.getSelectedFile()
                                            .getAbsolutePath();

                                    OutputStream out = new FileOutputStream(new File(
                                            selectedDir, file));

                                    try {

                                        byte[] buffer = new byte[1024];

                                        for (int c = 0; (c = socket.getInputStream()
                                                .read(buffer)) > 0;) {
                                            out.write(buffer, 0, c);
                                            System.out.println(c);
                                        }

                                        System.out.println("test1");

                                    } catch (Exception ex) {
                                        ex.printStackTrace();
                                    } finally {
                                        System.out.println("test2");
                                        out.flush();
                                        out.close();
                                        System.out.println("test3");
                                    }
                                }
                            }//  
                        }
                    });

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