可以用javascript实现:
var tree = document.getElementById("treeID");
var selNodeIndex = tree.clickedNodeIndex;
var node;
var children;
var parent;
if (selNodeIndex != null)
{
node = tree.getTreeNode(selNodeIndex);}
children = node.getChildren();//得到子结点,children是一个数组
parent = node.getParent();//得到父结点