1. jsp页面

<%@ page contentType="text/html;charset=UTF-8"%>
<%
        if (request.getProtocol().compareTo("HTTP/1.0") == 0)
                response.setHeader("Pragma", "no-cache");
        if (request.getProtocol().compareTo("HTTP/1.1") == 0)
                response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
%>

 
 
 
 
 
 
 


 

    

 

3.2.java文件getTreelist()方法

    public List getTreelist(){
    //设定树菜单的根
    String ztree = "{ id:00, pId:0, name:'要显示的根名,也可以从数据库取出', click:\"parent.setIframesrc()\" , open:true },";
    List ztreeList = new ArrayList();

 //从数据库获取所有菜单的信息
    List menuList = this.getMenuList();
    if(Collections.isNotEmpty(menuList)){
     ztreeList.add(ztree);
     for (int i = 0; i < menuList.size(); i++) {
        Menu menu = (Menu) menuList.get(i);
 //按照一定的格式拼接字符串，最后返回到jsp页面
        ztree = "{ id:"+menu.getMenuid()+", pId:"+menu.getParentid()+", name:\""+menu.getMenuname()+"\"," +
            "click:\"parent.setIframesrc('"+menu.getMenuid()+"')\"},";
        if (i+1 == menuList.size()) {
         ztree = ztree.substring(0, ztree.lastIndexOf(","));
        }
        ztreeList.add(ztree);
     }
    } 
    return ztreeList;
 }

3.然后从Action调用getTreelist(),并用"tree"的键值返回jsp页面，从jsp页面接收展示即可。

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