如何设置jTree节点的颜色(100分)

如何设置jTree节点的背景颜色

能讲清楚点么

找到jdk的源码javax.swing.tree.DefaultTreeCellRenderer.java直接修改
/*
* @(#)DefaultTreeCellRenderer.java 1.40 00/02/02
*
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the proprietary information of Sun Microsystems, Inc.
* Use is subject to license terms.
*
*/
package javax.swing.tree;
import javax.swing.*;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.FontUIResource;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
import java.util.*;
/**
* Displays an entry in a tree.
* See <a
href="http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html">How to Use Trees</a>
* in <em>The Java Tutorial</em>
* for examples of customizing node display using this class.
* <p>
*
* <strong><a name="override">Implementation Note:</a></strong>
* This class overrides
* <code>validate</code>,
* <code>revalidate</code>,
* <code>repaint</code>,
* and
* <code>firePropertyChange</code>
* solely to improve performance.
* If not overridden, these frequently called methods would execute code paths
* that are unnecessary for the default tree cell renderer.
* If you write your own renderer,
* take care to weigh the benefits and
* drawbacks of overriding these methods.
*
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is appropriate
* for short term storage or RMI between applications running the same
* version of Swing. A future release of Swing will provide support for
* long term persistence.
* @version 1.40 02/02/00
* @author Rob Davis
* @author Ray Ryan
* @author Scott Violet
*/
public class DefaultTreeCellRenderer extends JLabel implements TreeCellRenderer
{
/** Is the value currently selected. */
protected boolean selected;
/** True if has focus. */
protected boolean hasFocus;
/** True if draws focus border around icon as well. */
private boolean drawsFocusBorderAroundIcon;
// Icons
/** Icon used to show non-leaf nodes that aren't expanded. */
transient protected Icon closedIcon;
/** Icon used to show leaf nodes. */
transient protected Icon leafIcon;
/** Icon used to show non-leaf nodes that are expanded. */
transient protected Icon openIcon;
// Colors
/** Color to use for the foreground for selected nodes. */
protected Color textSelectionColor;
/** Color to use for the foreground for non-selected nodes. */
protected Color textNonSelectionColor;
/** Color to use for the background when a node is selected. */
protected Color backgroundSelectionColor;
/** Color to use for the background when the node isn't selected. */
protected Color backgroundNonSelectionColor;
/** Color to use for the background when the node isn't selected. */
protected Color borderSelectionColor;
/**
* Returns a new instance of DefaultTreeCellRenderer. Alignment is
* set to left aligned. Icons and text color are determined from the
* UIManager.
*/
public DefaultTreeCellRenderer() {
setHorizontalAlignment(JLabel.LEFT);
setLeafIcon(UIManager.getIcon("Tree.leafIcon"));
setClosedIcon(UIManager.getIcon("Tree.closedIcon"));
setOpenIcon(UIManager.getIcon("Tree.openIcon"));
setTextSelectionColor(UIManager.getColor("Tree.selectionForeground"));
setTextNonSelectionColor(UIManager.getColor("Tree.textForeground"));
setBackgroundSelectionColor(UIManager.getColor("Tree.selectionBackground"));
setBackgroundNonSelectionColor(UIManager.getColor("Tree.textBackground"));
setBorderSelectionColor(UIManager.getColor("Tree.selectionBorderColor"));
Object value = UIManager.get("Tree.drawsFocusBorderAroundIcon");
drawsFocusBorderAroundIcon = (value != null &amp;&amp;
((Boolean)value).
booleanValue());
}

/**
* Returns the default icon, for the current laf, that is used to
* represent non-leaf nodes that are expanded.
*/
public Icon getDefaultOpenIcon() {
return UIManager.getIcon("Tree.openIcon");
}
/**
* Returns the default icon, for the current laf, that is used to
* represent non-leaf nodes that are not expanded.
*/
public Icon getDefaultClosedIcon() {
return UIManager.getIcon("Tree.closedIcon");
}
/**
* Returns the default icon, for the current laf, that is used to
* represent leaf nodes.
*/
public Icon getDefaultLeafIcon() {
return UIManager.getIcon("Tree.leafIcon");
}
/**
* Sets the icon used to represent non-leaf nodes that are expanded.
*/
public void setOpenIcon(Icon newIcon) {
openIcon = newIcon;
}
/**
* Returns the icon used to represent non-leaf nodes that are expanded.
*/
public Icon getOpenIcon() {
return openIcon;
}
/**
* Sets the icon used to represent non-leaf nodes that are not expanded.
*/
public void setClosedIcon(Icon newIcon) {
closedIcon = newIcon;
}
/**
* Returns the icon used to represent non-leaf nodes that are not
* expanded.
*/
public Icon getClosedIcon() {
return closedIcon;
}
/**
* Sets the icon used to represent leaf nodes.
*/
public void setLeafIcon(Icon newIcon) {
leafIcon = newIcon;
}
/**
* Returns the icon used to represent leaf nodes.
*/
public Icon getLeafIcon() {
return leafIcon;
}
/**
* Sets the color the text is drawn with when the node is selected.
*/
public void setTextSelectionColor(Color newColor) {
textSelectionColor = newColor;
}
/**
* Returns the color the text is drawn with when the node is selected.
*/
public Color getTextSelectionColor() {
return textSelectionColor;
}
/**
* Sets the color the text is drawn with when the node isn't selected.
*/
public void setTextNonSelectionColor(Color newColor) {
textNonSelectionColor = newColor;
}
/**
* Returns the color the text is drawn with when the node isn't selected.
*/
public Color getTextNonSelectionColor() {
return textNonSelectionColor;
}
/**
* Sets the color to use for the background if node is selected.
*/
public void setBackgroundSelectionColor(Color newColor) {
backgroundSelectionColor = newColor;
}

/**
* Returns the color to use for the background if node is selected.
*/
public Color getBackgroundSelectionColor() {
return backgroundSelectionColor;
}
/**
* Sets the background color to be used for non selected nodes.
*/
public void setBackgroundNonSelectionColor(Color newColor) {
backgroundNonSelectionColor = newColor;
}
/**
* Returns the background color to be used for non selected nodes.
*/
public Color getBackgroundNonSelectionColor() {
return backgroundNonSelectionColor;
}
/**
* Sets the color to use for the border.
*/
public void setBorderSelectionColor(Color newColor) {
borderSelectionColor = newColor;
}
/**
* Returns the color the border is drawn.
*/
public Color getBorderSelectionColor() {
return borderSelectionColor;
}
/**
* Subclassed to map <code>FontUIResource</code>s to null. If
* <code>font</code> is null, or a <code>FontUIResource</code>, this
* has the effect of letting the font of the JTree show
* through. On the other hand, if <code>font</code> is non-null, and not
* a <code>FontUIResource</code>, the font becomes <code>font</code>.
*/
public void setFont(Font font) {
if(font instanceof FontUIResource)
font = null;
super.setFont(font);
}
/**
* Subclassed to map <code>ColorUIResource</code>s to null. If
* <code>color</code> is null, or a <code>ColorUIResource</code>, this
* has the effect of letting the background color of the JTree show
* through. On the other hand, if <code>color</code> is non-null, and not
* a <code>ColorUIResource</code>, the background becomes
* <code>color</code>.
*/
public void setBackground(Color color) {
if(color instanceof ColorUIResource)
color = null;
super.setBackground(color);
}
/**
* Configures the renderer based on the passed in components.
* The value is set from messaging the tree with
* <code>convertValueToText</code>, which ultimately invokes
* <code>toString</code> on <code>value</code>.
* The foreground color is set based on the selection and the icon
* is set based on on leaf and expanded.
*/
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel,
boolean expanded,
boolean leaf, int row,
boolean hasFocus) {
String stringValue = tree.convertValueToText(value, sel,
expanded, leaf, row, hasFocus);
this.hasFocus = hasFocus;
setText(stringValue);
if(sel)
setForeground(getTextSelectionColor());
else
setForeground(getTextNonSelectionColor());
// There needs to be a way to specify disabled icons.
if (!tree.isEnabled()) {
setEnabled(false);
if (leaf) {
setDisabledIcon(getLeafIcon());
} else
if (expanded) {
setDisabledIcon(getOpenIcon());
} else
{
setDisabledIcon(getClosedIcon());
}
}
else
{
setEnabled(true);
if (leaf) {
setIcon(getLeafIcon());
} else
if (expanded) {
setIcon(getOpenIcon());
} else
{
setIcon(getClosedIcon());
}
}
setComponentOrientation(tree.getComponentOrientation());

selected = sel;
return this;
}
/**
* Paints the value. The background is filled based on selected.
*/
public void paint(Graphics g) {
Color bColor;
if(selected) {
bColor = getBackgroundSelectionColor();
} else
{
bColor = getBackgroundNonSelectionColor();
if(bColor == null)
bColor = getBackground();
}
int imageOffset = -1;
if(bColor != null) {
Icon currentI = getIcon();
imageOffset = getLabelStart();
g.setColor(bColor);
if(getComponentOrientation().isLeftToRight()) {
g.fillRect(imageOffset, 0, getWidth() - 1 - imageOffset,
getHeight());
} else
{
g.fillRect(0, 0, getWidth() - 1 - imageOffset,
getHeight());
}
}
if (hasFocus) {
if (drawsFocusBorderAroundIcon) {
imageOffset = 0;
}
else
if (imageOffset == -1) {
imageOffset = getLabelStart();
}
Color bsColor = getBorderSelectionColor();
if (bsColor != null) {
g.setColor(bsColor);
if(getComponentOrientation().isLeftToRight()) {
g.drawRect(imageOffset, 0, getWidth() - 1 - imageOffset,
getHeight() - 1);
} else
{
g.drawRect(0, 0, getWidth() - 1 - imageOffset,
getHeight() - 1);
}
}
}
super.paint(g);
}
private int getLabelStart() {
Icon currentI = getIcon();
if(currentI != null &amp;&amp;
getText() != null) {
return currentI.getIconWidth() + Math.max(0, getIconTextGap() - 1);
}
return 0;
}
/**
* Overrides <code>JComponent.getPreferredSize</code> to
* return slightly wider preferred size value.
*/
public Dimension getPreferredSize() {
Dimension retDimension = super.getPreferredSize();
if(retDimension != null)
retDimension = new Dimension(retDimension.width + 3,
retDimension.height);
return retDimension;
}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void validate() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void revalidate() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void repaint(long tm, int x, int y, int width, int height) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void repaint(Rectangle r) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
// Strings get interned...
if (propertyName=="text")
super.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, char oldValue, char newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, short oldValue, short newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, int oldValue, int newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, long oldValue, long newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, float oldValue, float newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName,do
uble oldValue,do
uble newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
}
public class NewTreeCellRenderer extends JLabel implements TreeCellRenderer {
..........................
}
then
:
tree.setCellRenderer(newTreeCellRenderer);

把背景改成白色的就行了。

好办法