Swing編程（八）JTable表格 二

和JList,JTree相似，JTable採用TableModel來保存表格中的全部狀態數據，採用TableColumnModel來保存全部列的數據。eg[java]view plaincopy

publicclass TestDefaultTableModel
{
    JFrame mainWin = new JFrame("管理數據行、數據列");
finalint COLUMN_COUNT = 5;
    DefaultTableModel model;
    JTable table;
//用於保存被隱藏列的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("老單元格值 " + i + " " + j , i , j);
            }
        }

        table = new JTable(model);

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

//爲窗口安裝菜單
        JMenuBar menuBar = new JMenuBar();
        mainWin.setJMenuBar(menuBar);
        JMenu tableMenu = new JMenu("管理");
        menuBar.add(tableMenu);

        JMenuItem hideColumnsItem = new JMenuItem("隱藏選中列");
        hideColumnsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//獲取全部選中列的索引
int[] selected = table.getSelectedColumns();
                TableColumnModel columnModel = table.getColumnModel();
//依次把每個選中的列隱藏起來，並使用List把這些列保存起來
for (int i = selected.length - 1; i >= 0; i--)
                {
                    TableColumn column = columnModel.getColumn(selected[i]);
                    table.removeColumn(column);
//把隱藏的列保存起來，確保之後能夠顯示出來
                    hiddenColumns.add(column);
                }
            }
        });
        tableMenu.add(hideColumnsItem);

        JMenuItem showColumnsItem = new JMenuItem("顯示隱藏列");
        showColumnsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//把全部隱藏列依次顯示出來
for (TableColumn tc : hiddenColumns)
                {
//依次把全部隱藏的列顯示出來
                    table.addColumn(tc);
                }
//清空保存隱藏列的List集合
                hiddenColumns.clear();
            }
        });
        tableMenu.add(showColumnsItem);

        JMenuItem addColumnItem = new JMenuItem("插入選中列");
        addColumnItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//獲取全部選中列的索引
int[] selected = table.getSelectedColumns();
                TableColumnModel columnModel = table.getColumnModel();
//依次把選中的列添加到JTable以後
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("增長行");
        addRowItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//建立一個String數組做爲新增行的內容
                String[] newCells = new String[COLUMN_COUNT];
for (int i = 0; i < newCells.length; i++)
                {
                    newCells[i] = "新單元格值 " + model.getRowCount() + " " + i;
                }
//向TableModel中新增一行。
                model.addRow(newCells);
            }
        });
        tableMenu.add(addRowItem);

        JMenuItem removeRowsItem = new  JMenuItem("刪除選中行");
        removeRowsItem.addActionListener(new ActionListener()
        {
publicvoid actionPerformed(ActionEvent event)
            {
//獲取全部選中行
int[] selected = table.getSelectedRows();
//依次刪除全部選中行
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();
    }
}

但要注意列的增長，只是將原來隱藏的列顯示，而不是真正增長列，你要新增的話那就從新new個JTable

前面講的表格，單元格都是字符串，這是因爲咱們傳入的都是DefaultTableModel它最終調用toString方法來繪製表格，具體自定義單元格的方法以下，eg[java]view plaincopy

publicclass TestTableCellRenderer
{
    JFrame jf = new JFrame("使用單元格繪製器");
    JTable table;
//定義二維數組做爲表格數據
    Object[][] tableData =
    {
new Object[]{"李清照" , 29 , "女" , new ImageIcon("icon/3.gif") , true},
new Object[]{"蘇格拉底", 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[]{"虎頭" , 2 , "男" , new ImageIcon("icon/5.gif") , true}
    };
//定義一維數據做爲列標題
    String[] columnTitle = {"姓名" , "年齡" , "性別" , "主頭像" , "是否中國人"};
publicvoid init()
    {
//以二維數組和一維數組來建立一個ExtendedTableModel對象
        ExtendedTableModel model = new ExtendedTableModel(columnTitle , tableData);
//以ExtendedTableModel來建立JTable
        table = new JTable( model);
        table.setRowSelectionAllowed(false);
        table.setRowHeight(40);
//獲取第三列
        TableColumn lastColumn = table.getColumnModel().getColumn(2);
//對第三列採用自定義的單元格繪製器
        lastColumn.setCellRenderer(new GenderTableCellRenderer());

//將JTable對象放在JScrollPane中，並將該JScrollPane放在窗口中顯示出來
        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
{
//從新提供一個構造器，該構造器的實現委託給DefaultTableModel父類
public ExtendedTableModel(String[] columnNames , Object[][] cells)
    {
super(cells , columnNames);
    }
//重寫getColumnClass方法，根據每列的第一個值來返回其真實的數據類型
public Class getColumnClass(int c)
    {
return getValueAt(0 , c).getClass();
    }
}

class GenderTableCellRenderer extends JPanel implements TableCellRenderer
{
private String cellValue;
//定義圖標的寬度和高度
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;
//設置選中狀態下繪製邊框
if (hasFocus)
        {
            setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
        }
else
        {
            setBorder(null);
        }
returnthis;
    }
//重寫paint方法，負責繪製該單元格內容
publicvoid paint(Graphics g)
    {
//若是表格值爲"男"或"male"，則繪製一個男性圖標
if (cellValue.equalsIgnoreCase("男")
            || cellValue.equalsIgnoreCase("male"))
        {
            drawImage(g , new ImageIcon("icon/male.gif").getImage());
        }
//若是表格值爲"女"或"female"，則繪製一個女性圖標
if (cellValue.equalsIgnoreCase("女")
            || cellValue.equalsIgnoreCase("female"))
        {
            drawImage(g , new ImageIcon("icon/female.gif").getImage());
        }
    }
//繪製圖標的方法
privatevoid drawImage(Graphics g , Image p_w_picpath)
    {
        g.drawImage(p_w_picpath, (getWidth() - ICON_WIDTH ) / 2
            , (getHeight() - ICON_HEIGHT) / 2 , null);
    }
}

原創地址：http://blog.csdn.net/terryzero/article/details/3838423