Swing/PersistenceService のバックアップの現在との差分(No.6)

• バックアップ一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• バックアップ を表示
• Swing/PersistenceService へ行く。

• category: swing folder: PersistenceService title: PersistenceServiceを使ってJFrameの位置・サイズを記憶 tags: [ServiceManager, PersistenceService, JFrame, SwingWorker, XMLEncoder, XMLDecoder, Preferences] author: aterai pubdate: 2012-03-26T15:45:39+09:00 description: ServiceManagerからPersistenceServiceを取得し、JFrameなどの位置・サイズの保存、呼び出しを行います。 image:

概要

• &jnlp;
• &jar;
• &zip;

  Screenshot

  

  Download

  • Runnable JAR example.jar
  • Source code src.zip
  • Repository GitHub

  Advertisement

#spanend
#spanadd
class LoadSaveTask extends SwingWorker<WindowAdapter, Void> {
#spanend
  private final WindowState windowState;

#spandel
**サンプルコード [#xdef909f]
#spanend
#spandel
#code(link){{
#spanend
#spandel
final WindowState ws = new WindowState();
#spanend
#spandel
SwingWorker<WindowAdapter,Void> worker = new SwingWorker<WindowAdapter,Void>() {
#spanend
  public LoadSaveTask(WindowState windowState) {
    super();
    this.windowState = windowState;
  }
#spanadd

#spanend
  @Override public WindowAdapter doInBackground() {
    PersistenceService ps;
    BasicService bs;
    try{
      bs = (BasicService)ServiceManager.lookup("javax.jnlp.BasicService");
      ps = (PersistenceService)ServiceManager.lookup("javax.jnlp.PersistenceService");
    }catch(UnavailableServiceException use) {
      use.printStackTrace();
    try {
      bs = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService");
      ps = (PersistenceService) ServiceManager.lookup("javax.jnlp.PersistenceService");
    } catch (UnavailableServiceException use) {
      ps = null;
      bs = null;
    }
    if(ps != null && bs != null) {
    if (ps == null || bs == null) {
      return null;
    } else {
      final PersistenceService persistenceService = ps;
      final URL codebase = bs.getCodeBase();
      loadWindowState(persistenceService, codebase, ws);
      loadWindowState(persistenceService, codebase, windowState);
      return new WindowAdapter() {
        @Override public void windowClosing(WindowEvent e) {
          JFrame f = (JFrame)e.getComponent();
          if(f.getExtendedState()==JFrame.NORMAL) {
            ws.setSize(f.getSize());
            ws.setLocation(f.getLocationOnScreen());
          JFrame f = (JFrame) e.getComponent();
          if (f.getExtendedState() == Frame.NORMAL) {
            windowState.setSize(f.getSize());
            windowState.setLocation(f.getLocationOnScreen());
          }
          saveWindowState(persistenceService, codebase, ws);
          saveWindowState(persistenceService, codebase, windowState);
        }
      };
    }else{
      return null;
    }
  }
  @Override public void done() {
    WindowAdapter wa = null;
    try{
      wa = get();
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }catch(Exception e) {
      e.printStackTrace();
#spanadd

#spanend
  private static void loadWindowState(
      PersistenceService ps, URL codebase, WindowState windowState) {
    try {
      FileContents fc = ps.get(codebase);
      try (XMLDecoder d = new XMLDecoder(
          new BufferedInputStream(fc.getInputStream()))) {
        @SuppressWarnings("unchecked")
        Map<String, Serializable> map = (Map<String, Serializable>) d.readObject();
        windowState.setSize((Dimension) map.get("size"));
        windowState.setLocation((Point) map.get("location"));
      }
    } catch (IOException ex) {
      try {
        long size = ps.create(codebase, 64000);
        System.out.println("Cache created - size: " + size);
      } catch (IOException ioe) {
        ioe.printStackTrace();
      }
    }
    JFrame frame = new JFrame();
    if(wa!=null) frame.addWindowListener(wa);
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new MainPanel());
    frame.setSize(ws.getSize());
    frame.setLocation(ws.getLocation());
    frame.setVisible(true);
  }
#spandel
};
#spanend
#spandel
worker.execute();
#spanend
#spanadd

#spanend
  private static void saveWindowState(
      PersistenceService ps, URL codebase, WindowState windowState) {
    try {
      FileContents fc = ps.get(codebase);
      try (XMLEncoder e = new XMLEncoder(
          new BufferedOutputStream(fc.getOutputStream(true)))) {
        HashMap<String, Serializable> map = new HashMap<>();
        map.put("size", (Serializable) windowState.getSize());
        map.put("location", (Serializable) windowState.getLocation());
        e.writeObject(map);
        e.flush();
      }
    } catch (IOException ioe) {
      ioe.printStackTrace();
    }
  }
#spanadd
}
#spanend

#spandel
<?xml version="1.0" encoding="UTF-8"?> 
#spanend
#spandel
<java version="1.7.0_03" class="java.beans.XMLDecoder"> 
#spanend
 <object class="java.util.HashMap"> 
  <void method="put"> 
   <string>location</string> 
   <object idref="Point0"/> 
  </void> 
  <void method="put"> 
   <string>size</string> 
   <object idref="Dimension0"/> 
  </void> 
 </object> 
#spandel
</java> 
#spanend
#spanadd
<?xml version="1.0" encoding="UTF-8"?>
#spanend
#spanadd
<java version="1.7.0_03" class="java.beans.XMLDecoder">
#spanend
 <object class="java.util.HashMap">
  <void method="put">
   <string>location</string>
   <object idref="Point0"/>
  </void>
  <void method="put">
   <string>size</string>
   <object idref="Dimension0"/>
  </void>
 </object>
#spanadd
</java>
#spanend

• -

• XMLEncoder で直接 JFrame を書きだす場合は、removeWindowListener で、WindowListener を取り除いておかないと、以下のような IllegalAccessException が発生する
• XMLEncoderで直接上記のJFrameを書きだす場合、以下のようなIllegalAccessExceptionが発生する

java.lang.IllegalAccessException: Class sun.reflect.misc.Trampoline can not access a member of class MainPanel$2 with modifiers ""
Continuing ...

• または、その WindowListener を public class にしておけば問題ない

• 回避方法
  • WindowListenerを実装する匿名内部クラスをpublic class(Java Beans)に変更する
  • または、removeWindowListenerで取り除く
  • または、XMLEncoder#setExceptionListener(...)で、何もしないExceptionListenerを設定し、警告を捨ててしまう

#spandel
//package example;
#spanend
#spandel
//-*- mode:java; encoding:utf8n; coding:utf-8 -*-
#spanend
#spandel
// vim:set fileencoding=utf-8:
#spanend
#spandel
//@homepage@
#spanend
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
#spanadd
import java.nio.charset.StandardCharsets;
#spanend
import javax.swing.*;

public class MainPanel extends JPanel {
  private static final String PROPERTIES_XML = "properties.xml";
  public MainPanel() {
    super(new BorderLayout());
    JTextArea textArea = new JTextArea();
    try(Reader fr = new InputStreamReader(
        new FileInputStream(PROPERTIES_XML), "UTF-8")) {
    try (Reader fr = new InputStreamReader(
        new FileInputStream(PROPERTIES_XML), StandardCharsets.UTF_8)) {
      textArea.read(fr, "File");
    } catch(Exception ex) {
    } catch (Exception ex) {
      ex.printStackTrace();
    }
    add(new JScrollPane(textArea));
  }
  public static void main(String[] args) {
#spanadd

#spanend
  public static void main(String... args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        createAndShowGUI();
      }
    });
  }
#spanadd

#spanend
  public static void createAndShowGUI() {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch(Exception e) {
    } catch (Exception e) {
      e.printStackTrace();
    }
    JFrame frame = loadFrame();
    frame.setVisible(true);
  }
#spanadd

#spanend
  private static JFrame loadFrame() {
    JFrame frame = null;
    try(XMLDecoder d = new XMLDecoder(new BufferedInputStream(
        //MainPanel.class.getResourceAsStream(PROPERTIES_XML)))) {
    try (XMLDecoder d = new XMLDecoder(new BufferedInputStream(
        new FileInputStream(PROPERTIES_XML)))) {
#spandel

#spanend
      frame = (JFrame)d.readObject();
      //d.close();
    } catch(Exception ex) {
      frame = (JFrame) d.readObject();
      // d.close();
    } catch (Exception ex) {
      ex.printStackTrace();
    }
    if(frame==null) {
    if (frame == null) {
      frame = new JFrame("title");
      frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
      frame.getContentPane().add(new MainPanel());
      frame.setSize(320, 240);
      frame.setLocationRelativeTo(null);
    }
    frame.addWindowListener(new WindowAdapter() {
      @Override public void windowClosing(WindowEvent e) {
        JFrame frame = (JFrame)e.getComponent();
        JFrame frame = (JFrame) e.getComponent();
        frame.removeWindowListener(this);
        File file = new File(PROPERTIES_XML);
        try(XMLEncoder xe = new XMLEncoder(new BufferedOutputStream(
        try (XMLEncoder xe = new XMLEncoder(new BufferedOutputStream(
            new FileOutputStream(file)))) {
          xe.setExceptionListener(new ExceptionListener() {
            @Override public void exceptionThrown(Exception exception) {
              // XXX:
              exception.printStackTrace();
            }
          });
          xe.writeObject(frame);
          xe.flush();
          //xe.close();
        } catch(Exception ex) {
          // xe.flush(); xe.close();
        } catch (Exception ex) {
          ex.printStackTrace();
        }
      }
    });
    return frame;
  }
}

• JWS javax.jnlp.* API demos
• PersistenceService
• PersistenceService Demo
• PersistenceServiceサービスの使用
• JFrameの位置・サイズを記憶する
• JTableのモデルをXMLファイルで保存、復元する