Swing编程（八）JTable表格 二

和JList,JTree类似，JTable采用TableModel来保存表格中的所有状态数据，采用TableColumnModel来保存所有列的数据。eg[java]view plaincopy

publicclass TestDefaultTableModel
{
    JFrame mainWin = new JFrame("管理数据行、数据列");
finalint COLUMN_COUNT = 5;
    DefaultTableModel model;
    JTable table;
//用于保存被隐藏列的List集合
    ArrayList<TableColumn> hiddenColumns = new ArrayList<TableColumn>();
publicvoid init()
    {
        model = new DefaultTableModel(COLUMN_COUNT ,COLUMN_COUNT);
for (int i = 0; i < COLUMN_COUNT ; i++ )
        {
for (int j = 0; j < COLUMN_COUNT ; j++ )
            {
                model.setValueAt("老单元格值 " + i + " " + j , i , j);
            }
        }

        table = new JTable(model);

        mainWin.add(new JScrollPane(table), BorderLayout.CENTER);

//为窗口安装菜单
        JMenuBar menuBar = new JMenuBar();
        mainWin.setJMenuBar(menuBar);
        JMenu tableMenu = new JMenu("管理");
        menuBar.add(tableMenu);

        JMenuItem hideColumnsItem = new JMenuItem("隐藏选中列");
        hideColumnsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//获取所有选中列的索引
int[] selected = table.getSelectedColumns();
                TableColumnModel columnModel = table.getColumnModel();
//依次把每一个选中的列隐藏起来，并使用List把这些列保存起来
for (int i = selected.length - 1; i >= 0; i--)
                {
                    TableColumn column = columnModel.getColumn(selected[i]);
                    table.removeColumn(column);
//把隐藏的列保存起来，确保以后可以显示出来
                    hiddenColumns.add(column);
                }
            }
        });
        tableMenu.add(hideColumnsItem);

        JMenuItem showColumnsItem = new JMenuItem("显示隐藏列");
        showColumnsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//把所有隐藏列依次显示出来
for (TableColumn tc : hiddenColumns)
                {
//依次把所有隐藏的列显示出来
                    table.addColumn(tc);
                }
//清空保存隐藏列的List集合
                hiddenColumns.clear();
            }
        });
        tableMenu.add(showColumnsItem);

        JMenuItem addColumnItem = new JMenuItem("插入选中列");
        addColumnItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//获取所有选中列的索引
int[] selected = table.getSelectedColumns();
                TableColumnModel columnModel = table.getColumnModel();
//依次把选中的列添加到JTable之后
for (int i = selected.length - 1; i >= 0; i--)
                {
                    TableColumn column = columnModel.getColumn(selected[i]);
                    table.addColumn(column);
                }
            }
        });
        tableMenu.add(addColumnItem);

        JMenuItem addRowItem = new JMenuItem("增加行");
        addRowItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//创建一个String数组作为新增行的内容
                String[] newCells = new String[COLUMN_COUNT];
for (int i = 0; i < newCells.length; i++)
                {
                    newCells[i] = "新单元格值 " + model.getRowCount() + " " + i;
                }
//向TableModel中新增一行。
                model.addRow(newCells);
            }
        });
        tableMenu.add(addRowItem);

        JMenuItem removeRowsItem = new  JMenuItem("删除选中行");
        removeRowsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//获取所有选中行
int[] selected = table.getSelectedRows();
//依次删除所有选中行
for (int i = selected.length - 1; i >= 0; i--)
                {
                    model.removeRow(selected[i]);
                }
            }
        });
        tableMenu.add(removeRowsItem);

        mainWin.pack();
        mainWin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainWin.setVisible(true);
    }

publicstaticvoid main(String[] args)
    {
new TestDefaultTableModel().init();
    }
}

但要注意列的增加，只是将原来隐藏的列显示，而不是真正增加列，你要新增的话那就重新new个JTable

前面讲的表格，单元格都是字符串，这是由于我们传入的都是DefaultTableModel它最终调用toString方法来绘制表格，具体自定义单元格的方法如下，eg[java]view plaincopy

publicclass TestTableCellRenderer
{
    JFrame jf = new JFrame("使用单元格绘制器");
    JTable table;
//定义二维数组作为表格数据
    Object[][] tableData =
    {
new Object[]{"李清照" , 29 , "女" , new ImageIcon("icon/3.gif") , true},
new Object[]{"苏格拉底", 56 , "男" , new ImageIcon("icon/1.gif") , false},
new Object[]{"李白", 35 , "男" , new ImageIcon("icon/4.gif")  , true},
new Object[]{"弄玉", 18 , "女" , new ImageIcon("icon/2.gif")  , true},
new Object[]{"虎头" , 2 , "男" , new ImageIcon("icon/5.gif") , true}
    };
//定义一维数据作为列标题
    String[] columnTitle = {"姓名" , "年龄" , "性别" , "主头像" , "是否中国人"};
publicvoid init()
    {
//以二维数组和一维数组来创建一个ExtendedTableModel对象
        ExtendedTableModel model = new ExtendedTableModel(columnTitle , tableData);
//以ExtendedTableModel来创建JTable
        table = new JTable( model);
        table.setRowSelectionAllowed(false);
        table.setRowHeight(40);
//获取第三列
        TableColumn lastColumn = table.getColumnModel().getColumn(2);
//对第三列采用自定义的单元格绘制器
        lastColumn.setCellRenderer(new GenderTableCellRenderer());

//将JTable对象放在JScrollPane中，并将该JScrollPane放在窗口中显示出来
        jf.add(new JScrollPane(table));
        jf.pack();
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }
publicstaticvoid main(String[] args)
    {
new TestTableCellRenderer().init();
    }
}

class ExtendedTableModel extends DefaultTableModel
{
//重新提供一个构造器，该构造器的实现委托给DefaultTableModel父类
public ExtendedTableModel(String[] columnNames , Object[][] cells)
    {
super(cells , columnNames);
    }
//重写getColumnClass方法，根据每列的第一个值来返回其真实的数据类型
public Class getColumnClass(int c)
    {
return getValueAt(0 , c).getClass();
    }
}

class GenderTableCellRenderer extends JPanel implements TableCellRenderer
{
private String cellValue;
//定义图标的宽度和高度
finalint ICON_WIDTH = 23;
finalint ICON_HEIGHT = 21;
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column)
    {
        cellValue = (String)value;
//设置选中状态下绘制边框
if (hasFocus)
        {
            setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
        }
else
        {
            setBorder(null);
        }
returnthis;
    }
//重写paint方法，负责绘制该单元格内容
publicvoid paint(Graphics g)
    {
//如果表格值为"男"或"male"，则绘制一个男性图标
if (cellValue.equalsIgnoreCase("男")
            || cellValue.equalsIgnoreCase("male"))
        {
            drawImage(g , new ImageIcon("icon/male.gif").getImage());
        }
//如果表格值为"女"或"female"，则绘制一个女性图标
if (cellValue.equalsIgnoreCase("女")
            || cellValue.equalsIgnoreCase("female"))
        {
            drawImage(g , new ImageIcon("icon/female.gif").getImage());
        }
    }
//绘制图标的方法
privatevoid drawImage(Graphics g , Image image)
    {
        g.drawImage(image, (getWidth() - ICON_WIDTH ) / 2
            , (getHeight() - ICON_HEIGHT) / 2 , null);
    }
}

原创地址：http://blog.csdn.net/terryzero/article/details/3838423