Question

java JTable的一个简单问题

JTabel 中显示的信息如何能重新排列其显示的位置？比如想把第四，五行，放到第一二行？
我的意思是，表格中存的信息有姓名，编号……，我想当我点按姓名查找时候就能把相应的姓名那行，提最前面的一行。

Answer 1

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Hashtable;
import java.util.Locale;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;

/**
* @version 1.0 02/25/99
*/
public class SortableTableExample extends JPanel {

public SortableTableExample() {
setLayout(new BorderLayout());
String[] headerStr = { "Name", "Date", "Size", "Dir" };
int[] columnWidth = { 100, 150, 100, 50 };

SortableTableModel dm = new SortableTableModel() {
public Class getColumnClass(int col) {
switch (col) {
case 0:
return String.class;
case 1:
return Date.class;
case 2:
return Integer.class;
case 3:
return Boolean.class;
default:
return Object.class;
}
}

public boolean isCellEditable(int row, int col) {
switch (col) {
case 1:
return false;
default:
return true;
}
}

public void setValueAt(Object obj, int row, int col) {
switch (col) {
case 2:
super.setValueAt(new Integer(obj.toString()), row, col);
return;
default:
super.setValueAt(obj, row, col);
return;
}
}
};
dm
.setDataVector(
new Object[][] {
{ "b", getDate("98/12/02"), new Integer(14),
new Boolean(false) },
{ "a", getDate("99/01/01"), new Integer(67),
new Boolean(false) },
{ "d", getDate("99/02/11"), new Integer(2),
new Boolean(false) },
{ "c", getDate("99/02/27"), new Integer(7),
new Boolean(false) },
{ "foo", new Date(), new Integer(5),
new Boolean(true) },
{ "bar", new Date(), new Integer(10),
new Boolean(true) } }, headerStr);

JTable table = new JTable(dm);
//table.setShowGrid(false);
table.setShowVerticalLines(true);
table.setShowHorizontalLines(false);
SortButtonRenderer renderer = new SortButtonRenderer();
TableColumnModel model = table.getColumnModel();
int n = headerStr.length;
for (int i = 0; i < n; i++) {
model.getColumn(i).setHeaderRenderer(renderer);
model.getColumn(i).setPreferredWidth(columnWidth[i]);
}

JTableHeader header = table.getTableHeader();
header.addMouseListener(new HeaderListener(header, renderer));
JScrollPane pane = new JScrollPane(table);
add(pane, BorderLayout.CENTER);
}

public static void main(String[] args) {
JFrame f = new JFrame("SortableTable Example");
f.getContentPane().add(new SortableTableExample(), BorderLayout.CENTER);
f.setSize(400, 160);
f.setVisible(true);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}

private static DateFormat dateFormat = DateFormat.getDateInstance(
DateFormat.SHORT, Locale.JAPAN);

private static Date getDate(String dateString) {
Date date = null;
try {
date = dateFormat.parse(dateString);
} catch (ParseException ex) {
date = new Date();
}
return date;
}

class HeaderListener extends MouseAdapter {
JTableHeader header;

SortButtonRenderer renderer;

HeaderListener(JTableHeader header, SortButtonRenderer renderer) {
this.header = header;
this.renderer = renderer;
}

public void mousePressed(MouseEvent e) {
int col = header.columnAtPoint(e.getPoint());
int sortCol = header.getTable().convertColumnIndexToModel(col);
renderer.setPressedColumn(col);
renderer.setSelectedColumn(col);
header.repaint();

if (header.getTable().isEditing()) {
header.getTable().getCellEditor().stopCellEditing();
}

boolean isAscent;
if (SortButtonRenderer.DOWN == renderer.getState(col)) {
isAscent = true;
} else {
isAscent = false;
}
((SortableTableModel) header.getTable().getModel()).sortByColumn(
sortCol, isAscent);
}

public void mouseReleased(MouseEvent e) {
int col = header.columnAtPoint(e.getPoint());
renderer.setPressedColumn(-1); // clear
header.repaint();
}
}

}

class SortableTableModel extends DefaultTableModel {
int[] indexes;

TableSorter sorter;

public SortableTableModel() {
}

public Object getValueAt(int row, int col) {
int rowIndex = row;
if (indexes != null) {
rowIndex = indexes[row];
}
return super.getValueAt(rowIndex, col);
}

public void setValueAt(Object value, int row, int col) {
int rowIndex = row;
if (indexes != null) {
rowIndex = indexes[row];
}
super.setValueAt(value, rowIndex, col);
}

public void sortByColumn(int column, boolean isAscent) {
if (sorter == null) {
sorter = new TableSorter(this);
}
sorter.sort(column, isAscent);
fireTableDataChanged();
}

public int[] getIndexes() {
int n = getRowCount();
if (indexes != null) {
if (indexes.length == n) {
return indexes;
}
}
indexes = new int[n];
for (int i = 0; i < n; i++) {
indexes[i] = i;
}
return indexes;
}
}

class TableSorter {
SortableTableModel model;

public TableSorter(SortableTableModel model) {
this.model = model;
}

//n2 selection
public void sort(int column, boolean isAscent) {
int n = model.getRowCount();
int[] indexes = model.getIndexes();

for (int i = 0; i < n - 1; i++) {
int k = i;
for (int j = i + 1; j < n; j++) {
if (isAscent) {
if (compare(column, j, k) < 0) {
k = j;
}
} else {
if (compare(column, j, k) > 0) {
k = j;
}
}
}
int tmp = indexes[i];
indexes[i] = indexes[k];
indexes[k] = tmp;
}
}

// comparaters

public int compare(int column, int row1, int row2) {
Object o1 = model.getValueAt(row1, column);
Object o2 = model.getValueAt(row2, column);
if (o1 == null && o2 == null) {
return 0;
} else if (o1 == null) {
return -1;
} else if (o2 == null) {
return 1;
} else {
Class type = model.getColumnClass(column);
if (type.getSuperclass() == Number.class) {
return compare((Number) o1, (Number) o2);
} else if (type == String.class) {
return ((String) o1).compareTo((String) o2);
} else if (type == Date.class) {
return compare((Date) o1, (Date) o2);
} else if (type == Boolean.class) {
return compare((Boolean) o1, (Boolean) o2);
} else {
return ((String) o1).compareTo((String) o2);
}
}
}

public int compare(Number o1, Number o2) {
double n1 = o1.doubleValue();
double n2 = o2.doubleValue();
if (n1 < n2) {
return -1;
} else if (n1 > n2) {
return 1;
} else {
return 0;
}
}

public int compare(Date o1, Date o2) {
long n1 = o1.getTime();
long n2 = o2.getTime();
if (n1 < n2) {
return -1;
} else if (n1 > n2) {
return 1;
} else {
return 0;
}
}

public int compare(Boolean o1, Boolean o2) {
boolean b1 = o1.booleanValue();
boolean b2 = o2.booleanValue();
if (b1 == b2) {
return 0;
} else if (b1) {
return 1;
} else {
return -1;
}
}

}

class SortButtonRenderer extends JButton implements TableCellRenderer {
public static final int NONE = 0;

public static final int DOWN = 1;

public static final int UP = 2;

int pushedColumn;

Hashtable state;

JButton downButton, upButton;

public SortButtonRenderer() {
pushedColumn = -1;
state = new Hashtable();

setMargin(new Insets(0, 0, 0, 0));
setHorizontalTextPosition(LEFT);
setIcon(new BlankIcon());

// perplexed
// ArrowIcon(SwingConstants.SOUTH, true)
// BevelArrowIcon (int direction, boolean isRaisedView, boolean
// isPressedView)

downButton = new JButton();
downButton.setMargin(new Insets(0, 0, 0, 0));
downButton.setHorizontalTextPosition(LEFT);
downButton
.setIcon(new BevelArrowIcon(BevelArrowIcon.DOWN, false, false));
downButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.DOWN,
false, true));

upButton = new JButton();
upButton.setMargin(new Insets(0, 0, 0, 0));
upButton.setHorizontalTextPosition(LEFT);
upButton.setIcon(new BevelArrowIcon(BevelArrowIcon.UP, false, false));
upButton.setPressedIcon(new BevelArrowIcon(BevelArrowIcon.UP, false,
true));

}

public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
JButton button = this;
Object obj = state.get(new Integer(column));
if (obj != null) {
if (((Integer) obj).intValue() == DOWN) {
button = downButton;
} else {
button = upButton;
}
}
button.setText((value == null) ? "" : value.toString());
boolean isPressed = (column == pushedColumn);
button.getModel().setPressed(isPressed);
button.getModel().setArmed(isPressed);
return button;
}

public void setPressedColumn(int col) {
pushedColumn = col;
}

public void setSelectedColumn(int col) {
if (col < 0)
return;
Integer value = null;
Object obj = state.get(new Integer(col));
if (obj == null) {
value = new Integer(DOWN);
} else {
if (((Integer) obj).intValue() == DOWN) {
value = new Integer(UP);
} else {
value = new Integer(DOWN);
}
}
state.clear();
state.put(new Integer(col), value);
}

public int getState(int col) {
int retValue;
Object obj = state.get(new Integer(col));
if (obj == null) {
retValue = NONE;
} else {
if (((Integer) obj).intValue() == DOWN) {
retValue = DOWN;
} else {
retValue = UP;
}
}
return retValue;
}
}

class BevelArrowIcon implements Icon {
public static final int UP = 0; // direction

public static final int DOWN = 1;

private static final int DEFAULT_SIZE = 11;

private Color edge1;

private Color edge2;

private Color fill;

private int size;

private int direction;

public BevelArrowIcon(int direction, boolean isRaisedView,
boolean isPressedView) {
if (isRaisedView) {
if (isPressedView) {
init(UIManager.getColor("controlLtHighlight"), UIManager
.getColor("controlDkShadow"), UIManager
.getColor("controlShadow"), DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlHighlight"), UIManager
.getColor("controlShadow"), UIManager
.getColor("control"), DEFAULT_SIZE, direction);
}
} else {
if (isPressedView) {
init(UIManager.getColor("controlDkShadow"), UIManager
.getColor("controlLtHighlight"), UIManager
.getColor("controlShadow"), DEFAULT_SIZE, direction);
} else {
init(UIManager.getColor("controlShadow"), UIManager
.getColor("controlHighlight"), UIManager
.getColor("control"), DEFAULT_SIZE, direction);
}
}
}

public BevelArrowIcon(Color edge1, Color edge2, Color fill, int size,
int direction) {
init(edge1, edge2, fill, size, direction);
}

public void paintIcon(Component c, Graphics g, int x, int y) {
switch (direction) {
case DOWN:
drawDownArrow(g, x, y);
break;
case UP:
drawUpArrow(g, x, y);
break;
}
}

public int getIconWidth() {
return size;
}

public int getIconHeight() {
return size;
}

private void init(Color edge1, Color edge2, Color fill, int size,
int direction) {
this.edge1 = edge1;
this.edge2 = edge2;
this.fill = fill;
this.size = size;
this.direction = direction;
}

private void drawDownArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
g.drawLine(xo, yo, xo + size - 1, yo);
g.drawLine(xo, yo + 1, xo + size - 3, yo + 1);
g.setColor(edge2);
g.drawLine(xo + size - 2, yo + 1, xo + size - 1, yo + 1);
int x = xo + 1;
int y = yo + 2;
int dx = size - 6;
while (y + 1 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x += 1;
y += 2;
dx -= 2;
}
g.setColor(edge1);
g.drawLine(xo + (size / 2), yo + size - 1, xo + (size / 2), yo + size
- 1);
}

private void drawUpArrow(Graphics g, int xo, int yo) {
g.setColor(edge1);
int x = xo + (size / 2);
g.drawLine(x, yo, x, yo);
x--;
int y = yo + 1;
int dx = 0;
while (y + 3 < yo + size) {
g.setColor(edge1);
g.drawLine(x, y, x + 1, y);
g.drawLine(x, y + 1, x + 1, y + 1);
if (0 < dx) {
g.setColor(fill);
g.drawLine(x + 2, y, x + 1 + dx, y);
g.drawLine(x + 2, y + 1, x + 1 + dx, y + 1);
}
g.setColor(edge2);
g.drawLine(x + dx + 2, y, x + dx + 3, y);
g.drawLine(x + dx + 2, y + 1, x + dx + 3, y + 1);
x -= 1;
y += 2;
dx += 2;
}
g.setColor(edge1);
g.drawLine(xo, yo + size - 3, xo + 1, yo + size - 3);
g.setColor(edge2);
g.drawLine(xo + 2, yo + size - 2, xo + size - 1, yo + size - 2);
g.drawLine(xo, yo + size - 1, xo + size, yo + size - 1);
}

}

class BlankIcon implements Icon {
private Color fillColor;

private int size;

public BlankIcon() {
this(null, 11);
}

public BlankIcon(Color color, int size) {
//UIManager.getColor("control")
//UIManager.getColor("controlShadow")
fillColor = color;

this.size = size;
}

public void paintIcon(Component c, Graphics g, int x, int y) {
if (fillColor != null) {
g.setColor(fillColor);
g.drawRect(x, y, size - 1, size - 1);
}
}

public int getIconWidth() {
return size;
}

public int getIconHeight() {
return size;
}
}

Answer 2

没法子吧。除非你专门写个监听器，用button控制。点一下 第四五行 放到第一行（重绘一下）

Answer 3

把数据重新排好序后，创建新的模型，老的表格模型不要了。你懂我说的意思 是不？貌似没办法直接把数据调来调去

Answer 4

不明白 jTable? table吧

追问

JTable是 java Swing里的组件，你说的Table是AWT 中的吧。