樹型菜單(JAVA)

java 代碼

<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.util.*"%>
<%!
    public void addMenu(List list, Map map, HttpServletRequest request) throws Exception
    {
        //判斷map的url屬性是否爲空，若爲空則認爲是最終子菜單
        if (map.get("url") != null && !"".equals(map.get("url")))
        {
            //判斷權限號是否被允許
            String power = (String) map.get("power");
            boolean b =  true;//hasPerm(request, power);

            //允許訪問
            if (b)
            {
                map.put("display", "true"); //若權限號被允許則設置display爲true，並添加到list中
                list.add(map);
                //將父菜單的display屬性設置爲true
                String father = (String) map.get("father");
                if (father != null)
                {
                    setParentDisplay(list, father);
                }
            }
        }
        //非最終子菜單
        else
        {
            if ("".equals(map.get("father"))) //默認頂級菜單的display爲true
                map.put("display", "true");
            //若url爲空則直接添加到list中
            list.add(map);
        }
    }

    //用於設置父菜單的display屬性爲true
    public void setParentDisplay(List list, String father)
    {
        Iterator it = list.listIterator();
        Map map = null;

        while (it.hasNext())
        { //循環list中的元素
            map = (HashMap) it.next();
            if (father.equals(map.get("name")))
            { //判斷所獲得的元素的name屬性是否與指定的值相等
                if (map.get("display") == null)
                {
                    map.put("display", "true");
                    father = (String) map.get("father");
                    if (!"".equals(father) && father != null)
                    {
                        setParentDisplay(list, father);
                    }
                }
                break;
            }
        }
    }

    //將無效的元素移除
    public void removeDisplay(List list)
    {
        Iterator it = list.listIterator();
        Map map = null;

        while (it.hasNext())
        { //循環list中的元素
            map = (HashMap) it.next();
            if (map.get("display") == null)
            {
                it.remove();
            }
        }
    }

    //將列表打印出來
    public String MenuPrint(List list)
    {
        Iterator it = list.listIterator();
        Map map = null;
        String father = "";
        StringBuffer result = new StringBuffer(1000);
        int i = 0;
        int j = 0;
        // this "k" statement is addad
        int k = 0;
        while (it.hasNext())
        {
            map = (Map) it.next();
            while (!father.equals(map.get("father")))
            {
                result.append("</table>\n");
                if (!"".equals(map.get("father")))
                {
                    result.append("</td>\n</tr>\n");
                }
                father = findFather(list, father);
                i--;
            }
            if ("".equals(map.get("father")) && k == 0)
            {
                j++;
                k = k + 1;
                result.append("<table width=\"198\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n");
                result.append("<tr>\n");
                result.append("<td align=\"left\" colspan=2><a οnclick=\"openclose(img_").
                       append(map.get("name")).
                       append(",").
                       append(map.get("name")).
                       append(");\"><img src=\"./images/channel/close.gif\" align=\"left\" border=\"0\" name=\"img_").
                       append(map.get("name")).
                       append("\">").
                       append(map.get("text")).
                       append("</a></td>\n");
                result.append("</tr>\n");
                i++;
                result.append("<tr valign=\"top\">\n<td width=\"14px\"></td><td>\n");
                result.append("<table id=\"" + map.get("name") + "\" style=\"display:none\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n");
                father = (String) map.get("name");
            }
            else if (father.equals(map.get("father")))
            {
                result.append("<tr>\n");
                if ("".equals(map.get("url")) || map.get("url") == null)
                {
                    j++;
                    i++;
                    result.append("<td align=\"left\" colspan=2><a οnclick=\"openclose(img_").
                           append(map.get("name")).
                           append(",").
                           append(map.get("name")).
                           append(");\"><img src=\"./images/channel/close.gif\" align=\"left\" border=\"0\" name=\"img_").
                           append(map.get("name")).
                           append("\">").
                           append(map.get("text")).
                           append("</a></td>\n");
                    result.append("</tr>\n");
                    result.append("<tr valign=\"top\">\n<td width=\"14px\"></td>");
                    result.append("<td>\n");
                    result.append("<table id=\"" + map.get("name") + "\" style=\"display:none\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n");
                    father = (String) map.get("name");
                }
                else
                {
                    // this "if" statement is addad
                    if ("".equals(map.get("father")))
                    {
                        result.append("<td align=\"left\" colspan=2><a><img src=\"./images/channel/close.gif\" align=\"left\" border=\"0\" name=\"img_").
                               append(map.get("name")).
                               append("\"></a><a href=\"").
                               append(map.get("url")).
                               append("\" target=\"_self\">").
                               append(map.get("text")).
                               append("</a></td>\n");
                        result.append("</tr>\n");
                    }
                    else
                    {
                        result.append("<td align=\"left\" colspan=2><a><img src=\"./images/channel/circ.gif\" align=\"left\" border=\"0\" name=\"img_").
                               append(map.get("name")).
                               append("\"></a><a href=\"javascript:openWin('").
                               append(map.get("url")).
                               append("')\">").
                               append(map.get("text")).
                               append("</a></td>\n");
                        result.append("</tr>\n");
                    }
                }
            }
        }
        while (!"".equals(father))
        {
            result.append("</table>\n</td>\n</tr>\n");
            father = findFather(list, father);
        }
        result.append("</table>\n");

        return result.toString();
    }

    //用於查找上一級父菜單
    public String findFather(List list, String father)
    {
        Iterator it = list.listIterator();
        Map map = null;
        while (it.hasNext())
        {
            map = (Map) it.next();
            if (father.equals(map.get("name")))
            {
                father = (String) map.get("father");
                return father;
            }
        }
        return null;
    }

    public void addMenu(String name,String text,String url,String power,String father,Map map,List list,HttpServletRequest request) throws Exception
    {
        //Map map = null;
        //List list = new ArrayList();

        map = new HashMap();
        map.put("name", name);
        map.put("text", text);
        map.put("url", url);
        map.put("power", power);
        map.put("father", father);
        try
        {
            addMenu(list, map, request);
        }
        catch(Exception e)
        {
        }
    }

%>
<%
String path = request.getContextPath();
//數據區
Map map = null;
List list = new ArrayList();

//level0
map = new HashMap();
map.put("name", "level0");
map.put("text", "根菜單");
map.put("url", "");
map.put("power", "");
map.put("father", "");
addMenu(list, map, request);
//level1
map = new HashMap();
map.put("name", "level10");
map.put("text", "搜索引擎");
map.put("url", "");
map.put("power", "");
map.put("father", "level0");
addMenu(list, map, request);
//level2
map = new HashMap();
map.put("name", "level20");
map.put("text", "百度");
map.put("url", "http://www.baidu.com");
map.put("power", "");
map.put("father", "level10");
addMenu(list, map, request);

map = new HashMap();
map.put("name", "level21");
map.put("text", "GOOGLE");
map.put("url", "http://www.google.com");
map.put("power", "");
map.put("father", "level10");
addMenu(list, map, request);
//level1
map = new HashMap();
map.put("name", "level11");
map.put("text", "消息網站");
map.put("url", "");
map.put("power", "");
map.put("father", "level0");
addMenu(list, map, request);
//level2
map = new HashMap();
map.put("name", "level22");
map.put("text", "人民網");
map.put("url", "http://www.people.com.cn");
map.put("power", "");
map.put("father", "level11");
addMenu(list, map, request);

removeDisplay(list);

String userName = "King";
%>
<html>
<head>
<title>導航菜單</title>
<STYLE type="text/css">
BODY {
    FONT-SIZE: 9pt; FONT-FAMILY: sans-serif;background-color:#A9C3F0;
}
A
{
    COLOR: 000000; TEXT-DECORATION: none
}
A:hover
{
    COLOR: cc3300; TEXT-DECORATION: none
}
A:link {
    FONT-FAMILY: sans-serif; TEXT-DECORATION: none
}
A:active {
    FONT-FAMILY: sans-serif; TEXT-DECORATION: none
}
A:visited {
    FONT-FAMILY: sans-serif; TEXT-DECORATION: none
}
B {
    FONT-SIZE: 14px; COLOR: #000000
}
TABLE
{
     font:9pt;color: #cc3300
}
TD {
    FONT-SIZE: 12px;color:#363636
}
</STYLE>
<script language="JavaScript">
function openclose(param1, param)
{
    if (param.style.display == "none")
    {
        param.style.display = "";
        param1.src = "./images/channel/open.gif";
    }
    else
    {
        param.style.display = "none";
        param1.src = "./images/channel/close.gif";
    }
}

function openWin(url)
{
    parent.LoginTime.location.reload();
    //window.open(url,"forum");
    parent.forum.location = url;
}
window.onload = function(){
    //openclose(img_level0, level0);
    openAllMenu();
}
function openAllMenu()
{
    var tb = document.getElementsByTagName("TABLE");
    for (var i = 0; i < tb.length; i++)
    {
        if (tb[i].id == null || tb[i].id == "") continue;
        openclose(eval("img_" + tb[i].id), tb[i]);
    }
}
CollectGarbage();
</script>
</head>
<body topmargin=10 leftmargin=0>
  <table width="100%" height="100%" border="0" align="center" cellpadding="1" cellspacing="0" class="blue">
    <tr>
        <td cellspacing="2" height="23" background="./images/bgwelcome.png"> &nbsp;<strong>歡迎您－<%=(String) userName%></strong></td>
    </tr>
    <tr>
        <td  valign="top" height="100%" background="./images/bg.png"><%=MenuPrint(list)%></td>
    </tr>
 </table>
</body>
</html>