Freemarker 树形导航菜单（递归）

很多导航菜单是树形的，即一级一级往下细分，这样的结构固然需要用递归来处理。 
对于Freemarker 来说，宏就相当于函数，其定义了签名及参数列表。 
所以在页面应这样写：

    <ul>      <!-- 递归  宏定义 -->      <#macro bpTree children>        <#if children?? && children?size gt 0>       <#list children as child>        <#if child.children?? && child.children?size gt 0>        <li class="treeview">          <a href="javascript:void(0)">            <i class="${(child.mIcon=='')?string('fa fa-share',child.mIcon) }" aria-hidden="true"></i> <span>${child.mCname}</span>            <i class="fa fa-angle-left pull-right" aria-hidden="true"></i>          </a>          <ul class="treeview-menu">            <@bpTree children=child.children />          </ul>        </li>        <#else>            <li><a href="javascript:void(0)" onclick="loadContent('${child.mUrl}')"><i class="${ (child.mIcon=='')?string('fa fa-circle-o',child.mIcon) }" aria-hidden="true"></i> ${child.mCname}</a></li>           </#if>       </#list>    </#if>    </#macro>       <!-- 调用宏 生成递归树 -->       <@bpTree children=treeMenu />  </ul>
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treeMenu是Controller返回的JSON中的根元素，其值是JSONArray，所以最关键的核心问题是如何生成递归地数据结构。叶子节点的children为空数组。 
Fremarker 宏 请参考博文：Freemarker定义宏的用法

后台Service查询数据库处理数据生成JSONArray的数据结构格式：

[    {        "mCname": "框架应用管理",        "mIcon": "fa fa-square-o",        "mAppid": 1,        "mIsclose": 0,        "mIssys": 1,        "mUrl": "",        "children": [            {                "mCname": "模块管理",                "mIcon": "fa fa-cube",                "mAppid": 1,                "mIsclose": 0,                "mIssys": 1,                "mUrl": "AppMgr/ModuleManager/default.aspx",                "children": [],                "mOrderlevel": "0001",                "mParentName": "框架应用管理",                "mParentid": 1,                "moduleid": 2,                "mModulecode": "S00M00",                "aAppName": "框架应用管理"            },            {                "mCname": "配置管理",                "mIcon": "fa fa-cog",                "mAppid": 1,                "mIsclose": 0,                "mIssys": 1,                "mUrl": "AppMgr/ConfigManager/default.aspx",                "children": [],                "mOrderlevel": "0002",                "mParentName": "框架应用管理",                "mParentid": 1,                "moduleid": 3,                "mModulecode": "S00M01",                "aAppName": "框架应用管理"            },            {                "mCname": "应用字段设置",                "mIcon": "fa fa-key",                "mAppid": 1,                "mIsclose": 0,                "mIssys": 1,                "mUrl": "AppMgr/FieldManager/default.aspx",                "children": [],                "mOrderlevel": "0003",                "mParentName": "框架应用管理",                "mParentid": 1,                "moduleid": 4,                "mModulecode": "S00M02",                "aAppName": "框架应用管理"            },            {                "mCname": "系统异常日志",                "mIcon": "fa fa-file-pdf-o",                "mAppid": 1,                "mIsclose": 0,                "mIssys": 1,                "mUrl": "AppMgr/SystemErrorLog/default.aspx",                "children": [],                "mOrderlevel": "0004",                "mParentName": "框架应用管理",                "mParentid": 1,                "moduleid": 5,                "mModulecode": "S00M03",                "aAppName": "框架应用管理"            },            {                "mCname": "事件日志",                "mIcon": "fa fa-file-zip-o",                "mAppid": 1,                "mIsclose": 0,                "mIssys": 1,                "mUrl": "AppMgr/EventLog/default.aspx",                "children": [],                "mOrderlevel": "0005",                "mParentName": "框架应用管理",                "mParentid": 1,                "moduleid": 6,                "mModulecode": "S00M04",                "aAppName": "框架应用管理"            }        ],        "mOrderlevel": "0000",        "mParentid": 0,        "moduleid": 1,        "mModulecode": "S00",        "aAppName": "框架应用管理"    },    {        "mCname": "系统管理",        "mIcon": "fa fa-cogs",        "mAppid": 2,        "mIsclose": 0,        "mIssys": 0,        "mUrl": "",        "children": [            {                "mCname": "行政区管理",                "mIcon": "fa fa-circle",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/AreaManager/default.aspx",                "children": [],                "mOrderlevel": "0001",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 8,                "mModulecode": "S10M01",                "aAppName": "应用系统管理"            },            {                "mCname": "组织机构管理",                "mIcon": "fa fa-tree",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/CompanyManager/default.aspx",                "children": [],                "mOrderlevel": "0002",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 9,                "mModulecode": "S10M02",                "aAppName": "应用系统管理"            },            {                "mCname": "角色权限管理",                "mIcon": "fa fa-user-secret",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/RoleManager/default.aspx",                "children": [],                "mOrderlevel": "0003",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 10,                "mModulecode": "S10M03",                "aAppName": "应用系统管理"            },            {                "mCname": "用户管理",                "mIcon": "fa fa-users",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/UserManager/default.aspx",                "children": [],                "mOrderlevel": "0004",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 11,                "mModulecode": "S10M04",                "aAppName": "应用系统管理"            },            {                "mCname": "数据字典",                "mIcon": "fa fa-leaf",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/FieldValueManager/default.aspx",                "children": [],                "mOrderlevel": "0005",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 12,                "mModulecode": "S10M05",                "aAppName": "应用系统管理"            },            {                "mCname": "在线用户列表",                "mIcon": "fa fa-user",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "SysMgr/OnlineUser/default.aspx",                "children": [],                "mOrderlevel": "0009",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 16,                "mModulecode": "S10M09",                "aAppName": "应用系统管理"            },            {                "mCname": "系统设置",                "mIcon": "fa fa-cog",                "mAppid": 2,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "",                "children": [                    {                        "mCname": "事件日志查询",                        "mIcon": "fa fa-search-minus",                        "mAppid": 2,                        "mIsclose": 0,                        "mIssys": 0,                        "mUrl": "SysMgr/EventManager/default.aspx",                        "children": [],                        "mOrderlevel": "0006",                        "mParentName": "系统设置",                        "mParentid": 43,                        "moduleid": 13,                        "mModulecode": "S10M06",                        "aAppName": "应用系统管理"                    },                    {                        "mCname": "系统参数管理",                        "mIcon": "fa fa-square",                        "mAppid": 2,                        "mIsclose": 0,                        "mIssys": 0,                        "mUrl": "SysMgr/SystemParam/default.aspx",                        "children": [],                        "mOrderlevel": "0007",                        "mParentName": "系统设置",                        "mParentid": 43,                        "moduleid": 14,                        "mModulecode": "S10M07",                        "aAppName": "应用系统管理"                    },                    {                        "mCname": "系统维护",                        "mIcon": "fa fa-shield",                        "mAppid": 2,                        "mIsclose": 0,                        "mIssys": 0,                        "mUrl": "SysMgr/SystemState/default.aspx",                        "children": [],                        "mOrderlevel": "0008",                        "mParentName": "系统设置",                        "mParentid": 43,                        "moduleid": 15,                        "mModulecode": "S10M08",                        "aAppName": "应用系统管理"                    }                ],                "mOrderlevel": "0010",                "mParentName": "系统管理",                "mParentid": 7,                "moduleid": 43,                "mModulecode": "S10M10",                "aAppName": "应用系统管理"            }        ],        "mOrderlevel": "0000",        "mParentid": 0,        "moduleid": 7,        "mModulecode": "S10",        "aAppName": "应用系统管理"    },    {        "mCname": "查询&报表统计",        "mIcon": "",        "mAppid": 3,        "mIsclose": 0,        "mIssys": 0,        "mUrl": "",        "children": [            {                "mCname": "快递单查询",                "mIcon": "",                "mAppid": 3,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "ExpressMgr/ExpDocQuery/default.aspx",                "children": [],                "mOrderlevel": "0501",                "mParentName": "查询&报表统计",                "mParentid": 22,                "moduleid": 35,                "mModulecode": "S36M01",                "aAppName": "物流快递管理系统"            },            {                "mCname": "快递营收统计",                "mIcon": "",                "mAppid": 3,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "ExpressMgr/ExpIncomeStat/default.aspx",                "children": [],                "mOrderlevel": "0502",                "mParentName": "查询&报表统计",                "mParentid": 22,                "moduleid": 36,                "mModulecode": "S36M02",                "aAppName": "物流快递管理系统"            },            {                "mCname": "快递业务流量分析",                "mIcon": "",                "mAppid": 3,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "ExpressMgr/ExpDataAnalysis/default.aspx",                "children": [],                "mOrderlevel": "0503",                "mParentName": "查询&报表统计",                "mParentid": 22,                "moduleid": 37,                "mModulecode": "S36M03",                "aAppName": "物流快递管理系统"            },            {                "mCname": "快递业务报表",                "mIcon": "",                "mAppid": 3,                "mIsclose": 0,                "mIssys": 0,                "mUrl": "ExpressMgr/ExpCustomRpt/default.aspx",                "children": [],                "mOrderlevel": "0504",                "mParentName": "查询&报表统计",                "mParentid": 22,                "moduleid": 38,                "mModulecode": "S36M04",                "aAppName": "物流快递管理系统"            }        ],        "mOrderlevel": "0500",        "mParentid": 0,        "moduleid": 22,        "mModulecode": "S36",        "aAppName": "物流快递管理系统"    }]
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要生成如上所示的JSONArray，其Service层也需要用递归来处理数据，Service层的写法，

// 返回json格式的树形导航菜单    public JSONArray getTreeMenu() {        return treeMenuList(getModules(), 0);    }    // 菜单树形结构    public JSONArray treeMenuList(List<FrmModule> menuList, int parentId) {        JSONArray childMenu = new JSONArray();        for (FrmModule menu : menuList) {            if (parentId == menu.getmParentid()) {                JSONObject jo = (JSONObject) JSONObject.toJSON(menu);                JSONArray c_node = treeMenuList(menuList, menu.getModuleid());                jo.put("children", c_node);                childMenu.add(jo);            }        }        return childMenu;    }
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然后在Controller层调用Service层生成的JSONArray，封装返回的JSON数据：

    @RequestMapping(value = "/", method = RequestMethod.GET)    public String home(Model model) {        JSONArray ja = moduleService.getTreeMenu();        System.out.println(ja.toJSONString());        model.addAttribute("treeMenu",ja );        return "index";    }
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最后生成的树形菜单如下所示：