DefaultMtableTreeNode node = 指定的节点;

int chlCount = node.getChildCount();
List<TreePath[]> paths = new ArrayList<TreePath[]>();

DefaultMtableTreeNode chlNode = null;
for(int i = 0; i < chlCount; i++){
  chlNode = node.getChildAt(i);
  paths.add(chl.getPath());
}