效果如上图

import Java.awt.Color; 
import java.awt.Component; 
import java.awt.Dimension;

import javax.swing.JPanel; 
import javax.swing.JTree; 
import javax.swing.plaf.ColorUIResource; 
import javax.swing.tree.DefaultMutableTreeNode; 
import javax.swing.tree.TreeCellRenderer;

/** 
* 树的渲染工具类，实现了将组件挂到树上 
* @author 崔耀强 20150507 
* @version 1.1 
* */

public class TreeComponentRenderer extends JPanel implements TreeCellRenderer { 
private static final long serialVersionUID = 1L; 
private TreeComponent button; 
private DefaultMutableTreeNode root;

/*** @param button 需要挂到树上的组件* @param root 树的根节点*/
public TreeComponentRenderer(TreeComponent button,DefaultMutableTreeNode root) {setLayout(null);//button = new MyComponentUI2();this.button=button;this.root=root;add(button);
}public Component getTreeCellRendererComponent(JTree tree, Object value,boolean isSelected, boolean expanded, boolean leaf, int row,boolean hasFocus) {DefaultMutableTreeNode root2=(DefaultMutableTreeNode) value;if(leaf&&!root2.getParent().equals(root)){Equipment o= (Equipment) root2.getUserObject();if(o.getEquipmentType().getImgUrl()!=null){//UNDO  分组if(o.getEquipmentType().getIsGroup()==0){button.setPreferredSize(new Dimension(TreeComponent.compUI2Width,TreeComponent.compUI2Hight));//CD4组button.setLableText(o.getEquipmentType().getName()+"组");button.setLableImage(o.getEquipmentType().getImgUrl());button.setTextFiledText(o.getEquipmentType().getNum()+"");button.setTextFiledBackGround(Color.lightGray);button.setJlBackGround(Color.gray);}else{button.setPreferredSize(new Dimension(TreeComponent.compUI2Width,TreeComponent.compUI2Hight));button.setLableText(o.getId()+"");button.setLableImage(o.getEquipmentType().getImgUrl());button.setTextFiledText(o.getLocation());button.setTextFiledBackGround(Color.lightGray);button.setJlBackGround(Color.gray);}}return this;}   else{EquipmentType o= (EquipmentType) root2.getUserObject();if(o.getImgUrl()!=null){button.setPreferredSize(new Dimension( TreeComponent.compUI2Width,TreeComponent.compUI2Hight));button.setLableText(o.getName());button.setLableImage(o.getImgUrl());button.setTextFiledText(o.getNum()+"");button.setTextFiledBackGround(Color.lightGray);button.setJlBackGround(Color.gray);}return this;}
}
@Override
public Dimension getPreferredSize() {Dimension d_button = button.getPreferredSize();return new Dimension(d_button.width ,( d_button.height));
}
@Override
public void doLayout() {Dimension d_button = button.getPreferredSize();button.setBounds(4, 0,d_button.width, d_button.height );
}
//设置叶子的背景颜色
public void setBackground(Color color) {if (color instanceof ColorUIResource)color = null;super.setBackground(color);
}

}