ajax树形展示，JavaScript

package ajax.ch3.treeview; import javax.servlet.ServletException; import javax.servlet.http.*; import ajax.ch3.treeview.*; public class TreeviewServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { String parentID = request.getParameter("parent");//获得id的值 if (parentID!=null&&!parentID.equals(""))//如果不为null和空 { Category category = new Category(Integer.parseInt(parentID));//创建Category对象 TreeviewElement[] top = category.getChildren();//得到该分类的所有下级分类 response.setContentType("text/html"); java.io.PrintWriter out = response.getWriter(); for(int i= 0;i<top.length;i++)//循环显示每个分类 out.println(treeviewRender.renderTreeViewAjax(top[i],false)); } } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, java.io.IOException { doPost(request, response); } }