web.xml中Servlet配置如下：

<?xml version="1.0" encoding="UTF-8"?> 
 
 
 
  
 getDataServlet; 
 testTree.TestTree; 
  
 
  
 getDataServlet; 
 /getData; 
  
 
 

JSP页面：

Action代码：

public class TestTree extends HttpServlet { 
 
 @Override 
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
// System.out.println("--------doGet--------"); 
 this.doPost(request, response); 
 } 
 
 @Override 
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
// System.out.println("--------doPost--------"); 
 String id = request.getParameter("id"); 
 String name = request.getParameter("name"); 
 String level = request.getParameter("level"); 
 String otherParam = request.getParameter("otherParam"); 
 System.out.println(id + "|" + name + "|" + level + "|" + otherParam); 
 
 JSONObject json = new JSONObject(); 
 List> list = new ArrayList>(); 
 
 for(int i = 0; i < 5; i++){ 
 HashMap hm = new HashMap(); //最外层，父节点 
 hm.put("id", id + i);//id属性 ，数据传递 
 hm.put("name", id + i); //name属性，显示节点名称 
 hm.put("pId", id); 
 
 list.add(hm); 
 } 
 
 JSONArray arr = new JSONArray(list); 
 json.put("success", true); 
 json.put("arr", arr); 
 
 System.out.println("--------json------" + json.toString()); 
 response.getWriter().write(arr.toString()); 
// response.getWriter().write(json.toString()); 
// response.getWriter().write("[{pId:'2',name:'20',id:'20'}]"); 
 } 
 
}