java - JFrame のシリアル化とネットワーク経由での送信

Question

私がやろうとしているのは、ソケットを介して JFrame を送信することです。問題は、フォームを送信してボタンを押して表示した後、以下の例外が発生することです。

package ds3;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;

public class SerializationApp extends JFrame {

    private DataForm dataForm = new DataForm();
    private int serverPort = 15000;
    private ServerSocket serverSocket;

    public SerializationApp() {
        try {
            serverSocket = new ServerSocket(serverPort);
            initComponents();
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (true) {
                        try {
                            Socket socket = serverSocket.accept();
                            ObjectInputStream objectinputstream = new ObjectInputStream(socket.getInputStream());
                            DataForm dataform = (DataForm) objectinputstream.readObject();
                            dataform.setTitle(socket.getInetAddress().getHostAddress());
                            dataform.setVisible(true);
                            socket.close();
                        } catch (ClassNotFoundException ex) {
                            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (IOException ex) {
                            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                }
            }).start();
        } catch (IOException ex) {
            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        iptextfield = new javax.swing.JTextField();
        jPanel2 = new javax.swing.JPanel();
        viewButton = new javax.swing.JButton();
        sendButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Receiver IP Address", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Dialog", 0, 12), new java.awt.Color(0, 0, 204))); // NOI18N
        jPanel1.setLayout(new java.awt.BorderLayout());
        jPanel1.add(iptextfield, java.awt.BorderLayout.CENTER);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        viewButton.setText("View Form");
        viewButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                viewButtonActionPerformed(evt);
            }
        });
        jPanel2.add(viewButton);

        sendButton.setText("Send Form");
        sendButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendButtonActionPerformed(evt);
            }
        });
        jPanel2.add(sendButton);

        getContentPane().add(jPanel2, java.awt.BorderLayout.SOUTH);

        pack();
    }// </editor-fold>                        

private void viewButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    dataForm.setVisible(!dataForm.isVisible());
}                                          

private void sendButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    try {
        Socket clientsocket = new Socket(iptextfield.getText(), 15000);
        ObjectOutputStream oout = new ObjectOutputStream(clientsocket.getOutputStream());
        oout.writeObject(dataForm);
        oout.reset();
        oout.flush();
        clientsocket.close();

    } catch (IOException ex) {
        Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
    }
}                                          

    public static void main(String args[]) {

        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(SerializationApp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(SerializationApp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(SerializationApp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(SerializationApp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new SerializationApp().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JTextField iptextfield;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JButton sendButton;
    private javax.swing.JButton viewButton;
    // End of variables declaration                   
}

シリアル化されたクラス

package ds3;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Serializable;

public class DataForm extends javax.swing.JFrame implements Serializable {

    public DataForm() {
        initComponents();
        jButton1.addActionListener(new ClearFormActionListener());
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        buttonGroup1 = new javax.swing.ButtonGroup();
        jLabel1 = new javax.swing.JLabel();
        jPanel1 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        jPanel2 = new javax.swing.JPanel();
        jRadioButton1 = new javax.swing.JRadioButton();
        jRadioButton2 = new javax.swing.JRadioButton();
        jLabel5 = new javax.swing.JLabel();
        jTextField4 = new javax.swing.JTextField();
        jPanel3 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();

        setTitle("Personal Data Form");

        jLabel1.setFont(new java.awt.Font("Tahoma", 3, 11)); // NOI18N
        jLabel1.setForeground(new java.awt.Color(0, 0, 204));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("Please fill you data below");
        getContentPane().add(jLabel1, java.awt.BorderLayout.NORTH);

        jPanel1.setLayout(new java.awt.GridLayout(4, 2, 0, 2));

        jLabel2.setText("Firstname:");
        jPanel1.add(jLabel2);
        jPanel1.add(jTextField1);

        jLabel3.setText("Lastname:");
        jPanel1.add(jLabel3);
        jPanel1.add(jTextField2);

        jLabel4.setText("Gender:");
        jPanel1.add(jLabel4);

        jPanel2.setLayout(new java.awt.GridLayout(1, 2));

        buttonGroup1.add(jRadioButton1);
        jRadioButton1.setText("Male");
        jPanel2.add(jRadioButton1);

        buttonGroup1.add(jRadioButton2);
        jRadioButton2.setText("Female");
        jPanel2.add(jRadioButton2);

        jPanel1.add(jPanel2);

        jLabel5.setText("Email:");
        jPanel1.add(jLabel5);
        jPanel1.add(jTextField4);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        jButton1.setText("Clear");
        jPanel3.add(jButton1);

        getContentPane().add(jPanel3, java.awt.BorderLayout.SOUTH);

        pack();
    }// </editor-fold>                        


    // Variables declaration - do not modify                     
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JRadioButton jRadioButton2;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField4;
    // End of variables declaration                   

    class ClearFormActionListener implements ActionListener , Serializable {

        @Override
        public void actionPerformed(ActionEvent e) {
            jTextField1.setText("");
            jTextField2.setText("");
            jTextField4.setText("");
            buttonGroup1.clearSelection();
        }

    } 


}

例外。

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at javax.swing.plaf.synth.SynthLookAndFeel.paintRegion(SynthLookAndFeel.java:395)
    at javax.swing.plaf.synth.SynthLookAndFeel.update(SynthLookAndFeel.java:359)
    at javax.swing.plaf.synth.SynthRootPaneUI.update(SynthRootPaneUI.java:94)
    at javax.swing.JComponent.paintComponent(JComponent.java:765)
    at javax.swing.JComponent.paintToOffscreen(JComponent.java:5142)
    at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:302)
    at javax.swing.RepaintManager.paint(RepaintManager.java:1188)
    at javax.swing.JComponent.paint(JComponent.java:1015)
    at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:39)
    at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:78)
    at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:115)
    at java.awt.Container.paint(Container.java:1784)
    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:794)
    at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:735)
    at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
    at javax.swing.RepaintManager.access$700(RepaintManager.java:58)
    at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1593)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
    at java.awt.EventQueue.access$000(EventQueue.java:96)
    at java.awt.EventQueue$1.run(EventQueue.java:608)
    at java.awt.EventQueue$1.run(EventQueue.java:606)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:617)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

ファイル_

アップデート

もう少し詳しく言うと。フォームを送信すると、例外なく受信者にフォームが正常に表示され、その後例外なく送信者からのフォームが表示されないのはなぜですか。送信者が問題なくフォームを受信者に送信でき、その後View Formボタンが例外を引き起こす理由がシリアル化の問題である場合、私は意味しますか?

Answer 1

L&F がうまくシリアライズされていないように見えますが、やはり私のアドバイスは、代わりに GUI のモデルをシリアライズして、その状態を送信することです。その後、この状態でビューを簡単に再作成でき、送信されるデータの量は桁違いに少なくなります。

編集 1 : たとえば、投稿したコードでは、モデルとして PersonalData クラスを作成します。このクラスには、名、姓、および電子メール用の 3 つの文字列フィールドと、ブール (またはより良い列挙型) フィールドがあります。性別。

その場合、ソケットを介して送信される情報は、Swing GUI 全体ではなく、この「モデル」クラスのオブジェクトになります。渡されたオブジェクトからデータを入力して GUI を再現できます。

Answer 2

私がやろうとしているのは、ソケットを介して JFrame を送信することです

なんで？JFrameの Javadoc から:

警告: このクラスのシリアル化されたオブジェクトは、将来の Swing リリースと互換性がありません。現在のシリアライゼーション サポートは、同じバージョンの Swing を実行しているアプリケーション間の短期間の保存または RMI に適しています。1.4 の時点で、すべての JavaBeansTM の長期保存のサポートが java.beans パッケージに追加されました。XMLEncoder を参照してください。

これらの警告を無視しないでください。彼らは理由があってそこにいます。

Answer 3

私は何年も前に似たようなことをしましたが、 JPanel代わりにフレーム自体を送信することになりました。

Graphicsこの状況での問題は、フレームが、実装でホスト OS に本当に近いため (AWTWindowレベルで) 、もちろんシリアル化されず、ネットワーク経由で送信されないフレームに多少接続されているという事実だと思います。

パネルのみを送信することをお勧めします (最終的には、送信しようとしているフレームのコンテンツ ペインのみです) もう一度試してください。本当にフレーム プロパティをアタッチする必要がある場合は、それらをカスタム オブジェクトにカプセル化し、シリアル化によってアタッチできます (タイトルなど)。

Answer 4

JPanel実装

@Jack のアドバイスに従い、 a のJPanel代わりに a を送信するとうまくいくJFrameようです。以下、実装です。

package ds3;

import java.awt.Container;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class SerializationApp extends JFrame {

    private DataPanel dataPanel = new DataPanel();
    private JFrame frPanel = new JFrame();
    private int serverPort = 15000;
    private ServerSocket serverSocket;

    public SerializationApp() {
        try {
            serverSocket = new ServerSocket(serverPort);
            initComponents();
            setLocationRelativeTo(null);
            frPanel.add(dataPanel);
            frPanel.pack();
            frPanel.setLocationRelativeTo(this);
            frPanel.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            new Thread(new Runnable() {

                @Override
                public void run() {
                    while (true) {
                        try {
                            Socket socket = serverSocket.accept();
                            ObjectInputStream objectinputstream = new ObjectInputStream(socket.getInputStream());
                            JPanel container = (JPanel) objectinputstream.readObject();
                            JFrame frame = new JFrame(socket.getInetAddress().getHostAddress());
                            frame.add(container);
                            frame.pack();
                            frame.setLocationRelativeTo(null);
                            setVibility(frame);


                            socket.close();
                        } catch (ClassNotFoundException ex) {
                            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (IOException ex) {
                            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
                        }
                    }
                }
            }).start();
        } catch (IOException ex) {
            Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        iptextfield = new javax.swing.JTextField();
        jPanel2 = new javax.swing.JPanel();
        viewButton = new javax.swing.JButton();
        sendButton = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Receiver IP Address", javax.swing.border.TitledBorder.DEFAULT_JUSTIFICATION, javax.swing.border.TitledBorder.DEFAULT_POSITION, new java.awt.Font("Dialog", 0, 12), new java.awt.Color(0, 0, 204))); // NOI18N
        jPanel1.setLayout(new java.awt.BorderLayout());
        jPanel1.add(iptextfield, java.awt.BorderLayout.CENTER);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        viewButton.setText("View Form");
        viewButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                viewButtonActionPerformed(evt);
            }
        });
        jPanel2.add(viewButton);

        sendButton.setText("Send Form");
        sendButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendButtonActionPerformed(evt);
            }
        });
        jPanel2.add(sendButton);

        getContentPane().add(jPanel2, java.awt.BorderLayout.SOUTH);

        pack();
    }// </editor-fold>                        

    private void setVibility(final JFrame dataform) {

        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                dataform.setVisible(!dataform.isVisible());
            }
        });
    }

private void viewButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    setVibility(frPanel);
}                                          

private void sendButtonActionPerformed(java.awt.event.ActionEvent evt) {                                           
    try {
        Socket clientsocket = new Socket(iptextfield.getText(), 15000);
        ObjectOutputStream oout = new ObjectOutputStream(clientsocket.getOutputStream());
        oout.writeObject(dataPanel);
        oout.reset();
        oout.flush();
        clientsocket.close();
    } catch (UnknownHostException ex) {
        Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(SerializationApp.class.getName()).log(Level.SEVERE, null, ex);
    }
}                                          

    public static void main(String args[]) {

        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception ignored) {
            ignored.printStackTrace();
        }

        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new SerializationApp().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JTextField iptextfield;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JButton sendButton;
    private javax.swing.JButton viewButton;
    // End of variables declaration                   
}

のJPanel

受信したJPanel場合、2番目のもののみがActionListener機能します。

package ds3;


import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.Serializable;

public class DataPanel extends javax.swing.JPanel implements Serializable,ActionListener {

    public DataPanel() {
        initComponents();
        jButton1.addActionListener(this);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();

        jLabel1.setText("jLabel1");
        add(jLabel1);

        jLabel2.setText("jLabel1");
        add(jLabel2);

        jLabel3.setText("jLabel1");
        add(jLabel3);

        jLabel4.setText("jLabel1");
        add(jLabel4);

        jTextField1.setText("jTextField1");
        add(jTextField1);

        jTextField2.setText("jTextField1");
        add(jTextField2);

        jTextField3.setText("jTextField1");
        add(jTextField3);

        jTextField4.setText("jTextField1");
        add(jTextField4);

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        add(jButton1);
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
       System.out.println("The label");
    }                                        

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    private javax.swing.JTextField jTextField4;
    // End of variables declaration                   

    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("Print");
    }
}

XMLEncoder実装

クラス全体をXMLEncoderエンコードすると、フィールドの入力は転送されません。

メインクラス

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.XMLEncoder;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.UIManager;

public final class MainClass extends JFrame {

    private TheFRameForm x;

    public MainClass() {
        x = new TheFRameForm();
        initComponents();
        TheServer theServer = new TheServer();
        theServer.start();

    }

    void initComponents() {
        setTitle("Look At Me Now");
        setLayout(new FlowLayout());
        JButton b = new JButton("Show Form");
        b.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                x.setVisible(true);
            }
        });
        add(b);
        JButton s = new JButton("Send Form");
        s.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                sendForm();
            }
        });
        add(s);
        pack();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private void sendForm() {
        try {
            Socket clientsocket = new Socket("localhost", 15000);
            XMLEncoder encoder = new XMLEncoder(clientsocket.getOutputStream());
            encoder.writeObject(x); //.getContentPane()
            encoder.close();

            OutputStream memStream = new ByteArrayOutputStream();
            XMLEncoder mencoder = new XMLEncoder(memStream);
            mencoder.writeObject(x);//.getContentPane()
            mencoder.close();
            String xmlString = memStream.toString();
            System.out.println(xmlString);

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

    public static void main(String args[]) {

        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception ignored) {
            ignored.printStackTrace();
        }

        MainClass theMainclass = new MainClass();
    }
}

サーバークラス

import java.beans.XMLDecoder;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;

public class TheServer extends Thread {

    private static final int serverPort = 15000;
    private ServerSocket serverSocket;

    public TheServer() {
        try {
            serverSocket = new ServerSocket(serverPort);
        } catch (IOException ex) {
            Logger.getLogger(TheServer.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    @Override
    public void run() {
        try {
            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("Server is running");
                XMLDecoder decoder = new XMLDecoder(socket.getInputStream());
                JFrame frame = (JFrame) decoder.readObject();
                frame.setVisible(true);
                socket.close();
            }
        } catch (IOException ex) {
            Logger.getLogger(TheServer.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

そしてそのJFrame

public class TheFRameForm extends javax.swing.JFrame {

    public TheFRameForm() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jLabel1.setText("jLabel1");

        jTextField1.setText("jTextField1");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(123, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(54, 54, 54)
                .addComponent(jLabel1)
                .addGap(102, 102, 102))
            .addGroup(layout.createSequentialGroup()
                .addGap(149, 149, 149)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(120, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jButton1))
                .addGap(57, 57, 57)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(65, 65, 65))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        System.out.println("Print");      
    }                                        

    public static void main(String args[]) {

        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(TheFRameForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(TheFRameForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(TheFRameForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(TheFRameForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TheFRameForm().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JTextField jTextField1;
    // End of variables declaration                   
}