Add column by column selection for JTable

      use Swing We all know ,JTable Clicking on the head of a column can only achieve the sorting effect , Instead of selecting the contents of the whole column . And used to Excel Whether the children's shoes of the table want JTable You can choose by column ？ Now let's make one that can be selected by column JTable.

      Want to JTable Add the function of selecting by column , It's simple , Just complete the following two tasks ：

1.       Modify the selection method .
2.       Add a mouse monitoring event MouseListener.

      First look at the code ：

package com.monitor1394.tabletest; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JTable; import javax.swing.table.JTableHeader; /** * Allows you to select all columns by clicking at the beginning of the column JTable * @author monitor * Created on 2010-12-23, 15:11:58 */ public class ColumnSelectableJTable extends JTable{ public ColumnSelectableJTable(Object[][]items,Object[] headers){ super(items,headers); // You can select by column setColumnSelectionAllowed(true); // You cannot select by line setRowSelectionAllowed(false); final JTableHeader header=getTableHeader(); header.addMouseListener(new MouseAdapter(){ // Launch when mouse click is released public void mouseReleased(MouseEvent e){ // Cancel all selections if(!e.isShiftDown()) clearSelection(); // Get the number of columns clicked int column=header.columnAtPoint(e.getPoint()); // Select only one column addColumnSelectionInterval(column,column); } }); } }

       only JTable Common construction methods in , Other analogies .JTable The default is to select by row , We use it 17、19 The row code realizes the selection by column and shields the selection by row . The next step is to capture the mouse click event on the header .JTableHeader Not included addActionListener() Method , Only one... Can be added to it MouseLinstener The listener went up and rewritten its mouseReleased() Method .

       25 Line judgment Shift Is the key pressed , Press to select more , Add this column to the selection ; If not pressed , Then cancel all selections , Re election .27 Row to get which column is currently clicked .28 Row gets the current column .

       The test class is as follows ：

 package com.monitor1394.tabletest; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.ScrollPaneConstants; import javax.swing.UIManager; /** * Form test * * @author monitor * Created on 2010-12-23, 15:10:08 */ public class TableTest { private static final Object[][] items={ {"1001"," Li Jiansheng "," male ","[e-mail]"}, {"1001"," Wang Wenfu "," male ","[e-mail]"}, {"1001"," Open your mouth "," male ","[e-mail]"}, {"1001"," Sweet beauty "," Woman ","[e-mail]"}, }; private static final Object[] headers={"ID"," user name "," Gender "," mail "}; public static void main(String[] args){ try { // System default appearance UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception ex) { } JFrame frame=new JFrame(" Form test "); frame.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); ColumnSelectableJTable table=new ColumnSelectableJTable(items,headers); JScrollPane scroller=new JScrollPane(table,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS); frame.getContentPane().add(scroller); frame.pack(); frame.setVisible(true); } }   

         The effect is shown in the figure ：