How to get icon from JTable

Question

I changed the rendering of the cell in JTable to display an image instead of text using the following code:

 base_table.getColumnModel().getColumn(3).setCellRenderer(new TableCellRenderer() { @Override public Component getTableCellRendererComponent(JTable jtable, Object value, boolean bln, boolean bln1, int i, int i1) { JLabel lbl = new JLabel(); lbl.setIcon((ImageIcon) value); return lbl; } }); 

Now, I would like to get an image for each row in JTable in order to store it in the database. How can i do this?

Answer 1

I can not resist just for example

 import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import javax.swing.*; import javax.swing.table.*; public class TableIcon extends JFrame implements Runnable { private static final long serialVersionUID = 1L; private JTable table; private JLabel myLabel = new JLabel("waiting"); private int pHeight = 40; private boolean runProcess = true; private int count = 0; public TableIcon() { ImageIcon errorIcon = (ImageIcon) UIManager.getIcon("OptionPane.errorIcon"); ImageIcon infoIcon = (ImageIcon) UIManager.getIcon("OptionPane.informationIcon"); ImageIcon warnIcon = (ImageIcon) UIManager.getIcon("OptionPane.warningIcon"); String[] columnNames = {"Picture", "Description"}; Object[][] data = {{errorIcon, "About"}, {infoIcon, "Add"}, {warnIcon, "Copy"},}; DefaultTableModel model = new DefaultTableModel(data, columnNames) { private static final long serialVersionUID = 1L; // Returning the Class of each column will allow different // renderers to be used based on Class @Override public Class getColumnClass(int column) { return getValueAt(0, column).getClass(); } }; table = new JTable(model); table.setRowHeight(pHeight); table.setPreferredScrollableViewportSize(table.getPreferredSize()); JScrollPane scrollPane = new JScrollPane(table); add(scrollPane, BorderLayout.CENTER); myLabel.setPreferredSize(new Dimension(200, pHeight)); myLabel.setHorizontalAlignment(SwingConstants.CENTER); add(myLabel, BorderLayout.SOUTH); new Thread(this).start(); } public void run() { while (runProcess) { try { Thread.sleep(1250); } catch (Exception e) { e.printStackTrace(); } SwingUtilities.invokeLater(new Runnable() { @Override public void run() { ImageIcon myIcon = (ImageIcon) table.getModel().getValueAt(count, 0); String lbl = "JTable Row at : " + count; myLabel.setIcon(myIcon); myLabel.setText(lbl); count++; if (count > 2) { count = 0; } } }); } } public static void main(String[] args) { TableIcon frame = new TableIcon(); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setLocation(150, 150); frame.pack(); frame.setVisible(true); } } 

Answer 2

Data stored in JTable can be found in TableModel . But since this is your code, usually the one that creates this TableModel (from a list or array, as a rule), you should be able to get an icon from this list or array. Otherwise, just use table.getModel().getValueAt(row, column) and translate it into ImageIcon .

Answer 3

You should have all the images in your table model. Therefore, you just need to get the images from the model, and then save them in your database.

Your cell developer has an Object value type, then you use (ImageIcon) value to pass it to ImageIcon in lbl.setIcon((ImageIcon) value);

You can do exaccty the same way when you get data from your model:

 ImageIcon myIcon = (ImageIcon) base_table.getModel().getValueAt(rowIndex, 3); 

where 3 is your columnIndex for the image column, and rowIndex is the row you want.

Answer 4

below is the correct image rendering class.

 class SimpleCellRenderer extends DefaultTableCellRenderer{ @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); ((JLabel)cell).setIcon((Icon)value); ((JLabel)cell).setText(""); ((JLabel)cell).setHorizontalAlignment(JLabel.CENTER); if (isSelected) { cell.setBackground(Color.white); } else { cell.setBackground(null); } //((AbstractTableModel)table.getModel()).fireTableCellUpdated(row,column); return cell; } } 

below is a method from which everything is automatically populated. private void formWindowOpened (java.awt.event.WindowEvent evt)

 { // TODO add your handling code here: fillIcon(); } public void fillIcon() { int i,j,rowValue,colValue; int cols= student.getColumnCount(); int rows=student.getRowCount(); for(i =0 ;i<rows ;i++) { for(j=3; j<cols;j++) { rowValue = i; colValue = j; String value = (String)student.getValueAt(rowValue, colValue); if(value.equals("h"))//here h is the value stored in your database which is used to set some icon in place of value h. { ImageIcon icon = new ImageIcon(getClass().getResource("dash.png")); student.setValueAt(icon, rowValue, colValue); student.getColumnModel().getColumn(colValue).setCellRenderer(new SimpleCellRenderer()); }