ImageIcon DefaultTableModel

Question

我正在製作一個學校的程序，你可以記錄系統剪貼板的歷史，我的老師說這是迄今爲止好，但我需要添加圖像。所以我有幾張圖片來表示圖片，網址，文字或文件夾。但是當我嘗試使用.addRow處理圖像時，它會顯示圖像的來源，而不是實際的圖像。這裏是我的類

public class Main extends JFrame implements ClipboardOwner { 

private static final long serialVersionUID = -7215911935339264676L; 

public final Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard(); 

private static DecimalFormat df = new DecimalFormat("#.##"); 

public static ArrayList<NewEntry> history = new ArrayList<NewEntry>(); 

private DefaultTableModel model; 

private JTable table; 

public static void main(String[] args) throws Exception { 
    UIManager.setLookAndFeel(new GraphiteLookAndFeel()); 
    Static.main.setVisible(true); 
} 

public Main() { 
    super("Clipboard Logger"); 

    setSize(667, 418); 
    setLocationRelativeTo(null); 
    getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG); 
    setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); 

    model = new DefaultTableModel(null, new String[] { "Type", "Content", "Size", "Date" }); 
    table = new JTable(model) { 

     private static final long serialVersionUID = 2485117672771964339L; 

     @Override 
     public boolean isCellEditable(int row, int column) { 
      return false; 
     } 
    }; 

    table.addMouseListener(new MouseAdapter() { 
     @Override 
     public void mouseReleased(MouseEvent e) { 
      int r = table.rowAtPoint(e.getPoint()); 
      if (r >= 0 && r < table.getRowCount()) { 
       table.setRowSelectionInterval(r, r); 
      } else { 
       table.clearSelection(); 
      } 

      int rowindex = table.getSelectedRow(); 
      if (rowindex < 0) 
       return; 
      if (e.isPopupTrigger() && e.getComponent() instanceof JTable) { 
       createAndShowPopupMenu(rowindex, e.getX(), e.getY()); 
      } 
     } 
    }); 

    JScrollPane pane = new JScrollPane(table); 
    table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS); 

    getContentPane().add(pane); 

    Transferable trans = clipboard.getContents(this); 
    regainOwnership(trans); 

    setIconImage(Static.icon); 
} 

@Override 
public void lostOwnership(Clipboard clipboard, Transferable transferable) { 
    try { 
     Thread.sleep(50); 
     Transferable contents = clipboard.getContents(this); 
     processContents(contents); 
     regainOwnership(contents); 
    } catch (Exception e) { 
     regainOwnership(clipboard.getContents(this)); 
    } 
} 

public void processContents(Transferable t) throws UnsupportedFlavorException, IOException { 
    System.out.println("Processing: " + t); 
    DataFlavor[] flavors = t.getTransferDataFlavors(); 
    File file = new File(t.getTransferData(flavors[0]).toString().replace("[", "").replace("]", "")); 
    System.out.println("HI"+file.getName()); 
    NewEntry entry = null; 
    if (t.isDataFlavorSupported(DataFlavor.stringFlavor)) { 
     System.out.println("String Flavor"); 
     String s = (String) (t.getTransferData(DataFlavor.stringFlavor)); 
     entry = new NewEntry(EntryType.TEXT, s, getSizeUnit(s.getBytes().length), DateFormat.getDateInstance().format(new Date())); 
    } else if (isValidImage(file.getName()) && file.exists()) { 
     System.out.println("Image Flavor"); 

     entry = new NewEntry(EntryType.IMAGE, file.getAbsolutePath(), getSizeUnit(file.length()), DateFormat.getDateInstance().format(new Date())); 
    } 
    history.add(entry); 
    model.addRow(new Object[] { entry.getIcon(), entry.getContent(), entry.getSize(), entry.getDate() }); 
} 

public void regainOwnership(Transferable t) { 
    clipboard.setContents(t, this); 
} 

public boolean isValidImage(String filename) { 
    for (String string : ImageIO.getReaderFormatNames()) { 
     if (filename.endsWith(string)) { 
      return true; 
     } 
    } 
    return false; 
} 

public void createAndShowPopupMenu(int index, int x, int y) { 
    final NewEntry entry = history.get(index); 
    if (entry == null) return; 
    JPopupMenu pop = new JPopupMenu(); 
    JMenu jm = new JMenu("Open in"); 
    JMenuItem jmi = new JMenuItem("Browser"); 
    jmi.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent arg0) { 
      try { 
       Desktop.getDesktop().browse(new URI("file:///"+entry.getContent().replace("\\", "/"))); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } catch (URISyntaxException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
     } 
    }); 
    jm.add(jmi); 
    jmi = new JMenuItem("Windows Explorer"); 
    jmi.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent arg0) { 
      try { 
       Desktop.getDesktop().open(new File(entry.getContent())); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
    jm.add(jmi); 
    pop.add(jm); 
    pop.show(this, x, y); 
} 

public static String getSizeUnit(long dataSize) { 
    double n = dataSize; 
    String suffix = "B"; 
    if (n > 1000) { 
     suffix = "KB"; 
     n /= 1000; 
    } 
    if (n > 1000) { 
     suffix = "MB"; 
     n /= 1000; 
    } 
    if (n > 1000) { 
     suffix = "GB"; 
     n /= 1000; 
    } 
    return df.format(n)+suffix; 
} 
} 

這是我的EntryType類

public class EntryType { 

public static final ImageIcon TEXT = new ImageIcon(Toolkit.getDefaultToolkit().getImage("./resources/text.png")); 

public static final ImageIcon URL = new ImageIcon(Toolkit.getDefaultToolkit().getImage("./resources/url.png")); 

public static final ImageIcon FILE = new ImageIcon(Toolkit.getDefaultToolkit().getImage("./resources/file.png")); 

public static final ImageIcon IMAGE = new ImageIcon(Toolkit.getDefaultToolkit().getImage("./resources/image.png")); 

} 

我將如何使它所以當我做這行代碼：

model.addRow（新對象[] {entry.getIcon（），entry.getContent（），entry.getSize（），entry.getDate（）}）;

它實際上顯示圖標而不是源？

Answer 1

JTable爲圖像提供渲染器。覆蓋getColumnClass()併爲具有圖標的列返回Icon.class。

請參閱Editors and Renderers部分如何使用表教程。