Java带复选框的树（JavaCheckBoxTree）实现和应用

package demo; 
 
import javax.swing.tree.DefaultMutableTreeNode; 
 
public class CheckBoxTreeNode extends DefaultMutableTreeNode 
{ 
 protected boolean isSelected; 
  
 public CheckBoxTreeNode() 
 { 
  this(null); 
 } 
  
 public CheckBoxTreeNode(Object userObject) 
 { 
  this(userObject, true, false); 
 } 
  
 public CheckBoxTreeNode(Object userObject, boolean allowsChildren, boolean isSelected) 
 { 
  super(userObject, allowsChildren); 
  this.isSelected = isSelected; 
 } 
 
 public boolean isSelected() 
 { 
  return isSelected; 
 } 
  
 public void setSelected(boolean _isSelected) 
 { 
  this.isSelected = _isSelected; 
   
  if(_isSelected) 
  { 
   // 如果选中，则将其所有的子结点都选中 
   if(children != null) 
   { 
    for(Object obj : children) 
    { 
     CheckBoxTreeNode node = (CheckBoxTreeNode)obj; 
     if(_isSelected != node.isSelected()) 
      node.setSelected(_isSelected); 
    } 
   } 
   // 向上检查，如果父结点的所有子结点都被选中，那么将父结点也选中 
   CheckBoxTreeNode pNode = (CheckBoxTreeNode)parent; 
   // 开始检查pNode的所有子节点是否都被选中 
   if(pNode != null) 
   { 
    int index = 0; 
    for(; index 

package demo; 
 
import java.awt.Color; 
import java.awt.Component; 
import java.awt.Dimension; 
 
import javax.swing.JCheckBox; 
import javax.swing.JPanel; 
import javax.swing.JTree; 
import javax.swing.UIManager; 
import javax.swing.plaf.ColorUIResource; 
import javax.swing.tree.TreeCellRenderer; 
 
public class CheckBoxTreeCellRenderer extends JPanel implements TreeCellRenderer 
{ 
 protected JCheckBox check; 
 protected CheckBoxTreeLabel label; 
  
 public CheckBoxTreeCellRenderer() 
 { 
  setLayout(null); 
  add(check = new JCheckBox()); 
  add(label = new CheckBoxTreeLabel()); 
  check.setBackground(UIManager.getColor("Tree.textBackground")); 
  label.setForeground(UIManager.getColor("Tree.textForeground")); 
 } 
  
 /** 
  * 返回的是一个JPanel对象，该对象中包含一个JCheckBox对象 
  * 和一个JLabel对象。并且根据每个结点是否被选中来决定JCheckBox 
  * 是否被选中。 
  */ 
 @Override 
 public Component getTreeCellRendererComponent(JTree tree, Object value, 
   boolean selected, boolean expanded, boolean leaf, int row, 
   boolean hasFocus) 
 { 
  String stringValue = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus); 
  setEnabled(tree.isEnabled()); 
  check.setSelected(((CheckBoxTreeNode)value).isSelected()); 
  label.setFont(tree.getFont()); 
  label.setText(stringValue); 
  label.setSelected(selected); 
  label.setFocus(hasFocus); 
  if(leaf) 
   label.setIcon(UIManager.getIcon("Tree.leafIcon")); 
  else if(expanded) 
   label.setIcon(UIManager.getIcon("Tree.openIcon")); 
  else 
   label.setIcon(UIManager.getIcon("Tree.closedIcon")); 
    
  return this; 
 } 
 
 @Override 
 public Dimension getPreferredSize() 
 { 
  Dimension dCheck = check.getPreferredSize(); 
  Dimension dLabel = label.getPreferredSize(); 
  return new Dimension(dCheck.width + dLabel.width, dCheck.height 

package demo; 
 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Graphics; 
 
import javax.swing.Icon; 
import javax.swing.JLabel; 
import javax.swing.UIManager; 
import javax.swing.plaf.ColorUIResource; 
 
public class CheckBoxTreeLabel extends JLabel 
{ 
 private boolean isSelected; 
 private boolean hasFocus; 
  
 public CheckBoxTreeLabel() 
 { 
 } 
  
 @Override 
 public void setBackground(Color color) 
 { 
  if(color instanceof ColorUIResource) 
   color = null; 
  super.setBackground(color); 
 } 
  
 @Override 
 public void paint(Graphics g) 
 { 
  String str; 
  if((str = getText()) != null) 
  { 
   if(0 

package demo; 
 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
 
import javax.swing.JTree; 
import javax.swing.tree.TreePath; 
import javax.swing.tree.DefaultTreeModel; 
 
public class CheckBoxTreeNodeSelectionListener extends MouseAdapter 
{ 
 @Override 
 public void mouseClicked(MouseEvent event) 
 { 
  JTree tree = (JTree)event.getSource(); 
  int x = event.getX(); 
  int y = event.getY(); 
  int row = tree.getRowForLocation(x, y); 
  TreePath path = tree.getPathForRow(row); 
  if(path != null) 
  { 
   CheckBoxTreeNode node = (CheckBoxTreeNode)path.getLastPathComponent(); 
   if(node != null) 
   { 
    boolean isSelected = !node.isSelected(); 
    node.setSelected(isSelected); 
    ((DefaultTreeModel)tree.getModel()).nodeStructureChanged(node); 
   } 
  } 
 } 
} 

package demo; 
 
import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTree; 
import javax.swing.tree.DefaultTreeModel; 
 
public class DemoMain 
{ 
 public static void main(String[] args) 
 { 
  JFrame frame = new JFrame("CheckBoxTreeDemo"); 
  frame.setBounds(200, 200, 400, 400); 
  JTree tree = new JTree(); 
  CheckBoxTreeNode rootNode = new CheckBoxTreeNode("root"); 
  CheckBoxTreeNode node1 = new CheckBoxTreeNode("node_1"); 
  CheckBoxTreeNode node1_1 = new CheckBoxTreeNode("node_1_1"); 
  CheckBoxTreeNode node1_2 = new CheckBoxTreeNode("node_1_2"); 
  CheckBoxTreeNode node1_3 = new CheckBoxTreeNode("node_1_3"); 
  node1.add(node1_1); 
  node1.add(node1_2); 
  node1.add(node1_3); 
  CheckBoxTreeNode node2 = new CheckBoxTreeNode("node_2"); 
  CheckBoxTreeNode node2_1 = new CheckBoxTreeNode("node_2_1"); 
  CheckBoxTreeNode node2_2 = new CheckBoxTreeNode("node_2_2"); 
  node2.add(node2_1); 
  node2.add(node2_2); 
  rootNode.add(node1); 
  rootNode.add(node2); 
  DefaultTreeModel model = new DefaultTreeModel(rootNode); 
  tree.addMouseListener(new CheckBoxTreeNodeSelectionListener()); 
  tree.setModel(model); 
  tree.setCellRenderer(new CheckBoxTreeCellRenderer()); 
  JScrollPane scroll = new JScrollPane(tree); 
  scroll.setBounds(0, 0, 300, 320); 
  frame.getContentPane().add(scroll); 
   
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
  frame.setVisible(true); 
 } 
}