Java核心技术（高级Swing）二表格

简单表格

JTable并不存储它自己的数据，而是从一个表格模型中获得它的数据。JTable类有一个构造器能够将一个二维对象数组包装到一个默认的模型。简单表格直接调用每个对象上的toString方法来显示它们。

表格模型

可以利用AbstractTableModel类来实现表格模型，它实现了大部分必需的方法，仅仅需要实现如下方法：

public int getRowCount();

public int getColumnCount();

public Object getValueAt(int row, int column);

对行和列的操作

JTable类将有关表格列的信息存放在类型为TableColumn的对象中，由一个TableColumnModel对象负责管理这些列。可以向

JTable中添加排序机制，如果要对排序行为进行细粒度的控制，就必需像JTable中安装一个TableRowSorter<M>对象，并对其进行定

制化。类型参数M表示表格模型，必须是TableModel接口的子类型。TableRowSorter还可以有选择性地隐藏行，这种处理称为过滤器。

想要激活过滤机制，需要设置RowFilter。

单元格的绘制和编辑

列的类型确定了单元格应该如何绘制。Boolean和Icon类型有默认的绘制器，它们将绘制为复选框或图标，而对于其他类型，都需

要安装定制的绘制器。表格单元绘制器实现TableCellRenderer接口。为了使单元格可编辑，表格模型必须通过定义isCellEditable方法

指明哪些单元格是可编辑的。定制编辑器：创建一个定制的单元格编辑器，需要实现TableCellEditor接口。AbstractCellEditor类可以

用于负责事件处理的细节。

public class TableDemo extends JFrame {public static void main(String[] args){new TableDemo().setVisible(true);}public TableDemo() {setTitle("PlanetTable");setSize(WIDTH, HEIGHT);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//简单表格，二维数组提供数据JTable plainTable = new JTable(cells, columnNames);plainTable.setAutoCreateRowSorter(true);//AbstractTableModel实现表格模型JTable tableModel = new JTable(new AbstractTableModel(){public Class<?> getColumnClass(int c){return cells[0][c].getClass();}public int getColumnCount() {return cells[0].length;}public int getRowCount() {return cells.length;}public Object getValueAt(int r, int c) {return cells[r][c];}public String getColumnName(int c){return columnNames[c];}public void setValueAt(Object obj, int r, int c){cells[r][c] = obj;}public boolean isCellEditable(int r, int c){return c == MOONS_COLUMN || c == GASEOUS_COLUMN || c == COLOR_COLUMN;}});//自定义绘制方式tableModel.setDefaultRenderer(Color.class, new TableCellRenderer(){public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int colum) {JComponent component = new JPanel();component.setBackground((Color)value);if(hasFocus)component.setBorder(new EtchedBorder());elsecomponent.setBorder(null);return component;}});tableModel.setRowSelectionAllowed(false);//自定义编辑方式tableModel.setDefaultEditor(Color.class, new ColorCellEditor());//默认的编辑器JComboBox comboBox = new JComboBox();for(int i =0;i<20;i++){comboBox.addItem(i);}tableModel.getColumnModel().getColumn(MOONS_COLUMN).setCellEditor(new DefaultCellEditor(comboBox));//自定义排序方式final TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(tableModel.getModel());tableModel.setRowSorter(sorter);sorter.setSortable(PLANET_COLUMN, false);sorter.setComparator(RADIUS_COLUMN, new Comparator<Object>(){public int compare(Object o1, Object o2) {double d1 = Double.parseDouble(o1.toString());double d2 = Double.parseDouble(o2.toString());return (int)(d1 - d2);}});JPanel panel = new JPanel();panel.add(new JScrollPane(plainTable));panel.add(new JScrollPane(tableModel));add(panel, BorderLayout.CENTER);JPanel buttonPanel = new JPanel();final JToggleButton button = new JToggleButton("过滤");button.addActionListener(new ActionListener(){//设置过滤方式public void actionPerformed(ActionEvent event) {if(button.isSelected()){sorter.setRowFilter(RowFilter.regexFilter(".*[s]$", PLANET_COLUMN));}else{sorter.setRowFilter(RowFilter.regexFilter("", PLANET_COLUMN));}}});buttonPanel.add(button);add(buttonPanel, BorderLayout.SOUTH);pack();}//自定义编辑private class ColorCellEditor extends AbstractCellEditor implements TableCellEditor{public ColorCellEditor() {panel = new JPanel();colorChooser = new JColorChooser();colorDialog = JColorChooser.createDialog(null, "Planet Color", true, colorChooser, new ActionListener(){public void actionPerformed(ActionEvent arg0) {stopCellEditing();}}, new ActionListener(){public void actionPerformed(ActionEvent arg0) {cancelCellEditing();}});colorDialog.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent evt){cancelCellEditing();}});}public Component getTableCellEditorComponent(JTable table, Object value,boolean isSelected, int row, int column) {colorChooser.setColor((Color)value);panel.setBackground((Color)value);panel.setBorder(new EtchedBorder());return panel;}public Object getCellEditorValue() {return colorChooser.getColor();}public boolean shouldSelectCell(EventObject anEvent){colorDialog.setVisible(true);return true;}public void cancelCellEditing(){colorDialog.setVisible(false);super.cancelCellEditing();}public boolean stopCellEditing(){colorDialog.setVisible(false);super.stopCellEditing();return true;}private JColorChooser colorChooser;private JDialog colorDialog;private JPanel panel;}private static final int PLANET_COLUMN = 0;private static final int RADIUS_COLUMN = 1;private static final int MOONS_COLUMN = 2;private static final int GASEOUS_COLUMN = 3;private static final int COLOR_COLUMN = 4;private String[] columnNames = {"Planet", "Radius", "Moons", "Gaseous", "Color"};private Object[][] cells = {{"Mercury", 2440.0, 0, false, Color.YELLOW},{"Venus", 6052.0, 0, false, Color.YELLOW},{"Earth", 6378.0, 1, false, Color.BLUE},{"Mars", 3397.0, 2, false, Color.RED},{"Jupiter", 71492.0, 16, true, Color.ORANGE},{"Saturn", 60268.0, 18, true, Color.ORANGE},{"Uranus", 25559.0, 17, true, Color.BLUE},{"Nepture", 24766.0, 8, true, Color.BLUE}};private static final int WIDTH = 400;private static final int HEIGHT = 300;}