java jtree 指定节点的展开和关闭，选择鼠标最近的节点

jtree对于指定节点，怎么开启和关闭呢？下面写两个方法，供大家参考。

package com.sysc.xmleditor.utils;

import java.awt.event.MouseEvent;

import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
/**
 * jtree帮助类
 * @author Administrator
 *
 */
public class TreeHelp {
	/**
	 * 展开指定节点所有后代节点
	 * @param aTree展开所有节点，后代节点层层展开
	 * @param aNode
	 */
	public static void expandTreeNode(JTree aTree, DefaultMutableTreeNode aNode) {
	    if (aNode.isLeaf()) {
	      return;
	    }
	    aTree.expandPath(new TreePath( ( (DefaultMutableTreeNode) aNode).getPath()));
	    int n = aNode.getChildCount();
	    for (int i = 0; i <n; i++) {
	      expandTreeNode(aTree, (DefaultMutableTreeNode) aNode.getChildAt(i));
	    }
	 }
	
	/**
	 * 关闭指定节点所有后代节点
	 * @param aTree，直接关闭指定节点
	 * @param aNode
	 */
	public static void collapseTreeNode(JTree aTree, DefaultMutableTreeNode aNode) {
	    if (aNode.isLeaf()) {
	      return;
	    }
	    
	    TreePath path=new TreePath(aNode.getPath());
	    aTree.collapsePath(path);
	  }
	
	/**
	 * 通过鼠标的位置找到选择的位置
	 * @param tree
	 * @param e
	 */
	public static void selectTreeElem_Mouse(JTree tree,MouseEvent e) {
        TreePath path = getPathByMouse(tree, e);
        tree.setSelectionPath(path);
    }
	
	/**
	 * 返回鼠标最近的treePath节点
	 * @param tree
	 * @param e
	 * @return
	 */
	public static TreePath getPathByMouse(JTree tree,MouseEvent e){
		TreePath path = tree.getPathForLocation(e.getX(),e.getY());//选择鼠标最近的节点的条目
		return path;
	}
}