Freemarker如何生成树形导航菜单（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freemarker页面应这样写：

<#macro menuTree menus> 
  <#if menus?? && menus?size gt 0> 
   <#list menus as menu> 
     
      
       
      
      
    
   ${menu.menuName!} 
    
      
      
     ${menu.url!} 
      
      
     ${menu.permissionText!} 
      
      
     ${menu.sortNo!} 
      
      
      [编辑] 
      
     
   <#if menu.menuBeans?? && menu.menuBeans?size gt 0> 
    <@menuTree menus = menu.menuBeans/> 
    
    
   
  
  
<@menuTree menus = dto /> 

后台数据：

[ 
 { 
  "id": 1, 
  "enable": true, 
  "remark": null, 
  "createBy": 1, 
  "createTime": 1503546411000, 
  "updateBy": 1, 
  "updateTime": 1503546415000, 
  "keyword": null, 
  "menuName": "系统管理", 
  "menuType": 1, 
  "parentId": null, 
  "iconcls": null, 
  "url": null, 
  "expand": null, 
  "sortNo": null, 
  "permission": null, 
  "moduleId": 1, 
  "parentName": null, 
  "leaf": 0, 
  "typeName": null, 
  "permissionText": null, 
  "menuBeans": [ 
   { 
    "id": 7, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "模块管理", 
    "menuType": 1, 
    "parentId": 1, 
    "iconcls": null, 
    "url": "/module/list", 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 3, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "菜单管理", 
    "menuType": 1, 
    "parentId": 1, 
    "iconcls": null, 
    "url": "/menu/list", 
    "expand": null, 
    "sortNo": null, 
    "permission": "admin:add", 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   } 
  ] 
 }, 
 { 
  "id": 2, 
  "enable": true, 
  "remark": null, 
  "createBy": 1, 
  "createTime": 1503546411000, 
  "updateBy": 1, 
  "updateTime": 1503546415000, 
  "keyword": null, 
  "menuName": "用户管理", 
  "menuType": 1, 
  "parentId": null, 
  "iconcls": null, 
  "url": null, 
  "expand": null, 
  "sortNo": null, 
  "permission": null, 
  "moduleId": 1, 
  "parentName": null, 
  "leaf": 0, 
  "typeName": null, 
  "permissionText": null, 
  "menuBeans": [ 
   { 
    "id": 9, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "供应商管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": null, 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 8, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "部门管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": null, 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 6, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "权限管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": "/user/list-6", 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 5, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "角色管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": "/user/list-5", 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 4, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "分销商管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": "/user/add-4", 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   }, 
   { 
    "id": 10, 
    "enable": true, 
    "remark": null, 
    "createBy": 1, 
    "createTime": 1503546411000, 
    "updateBy": 1, 
    "updateTime": 1503546415000, 
    "keyword": null, 
    "menuName": "员工管理", 
    "menuType": 1, 
    "parentId": 2, 
    "iconcls": null, 
    "url": null, 
    "expand": null, 
    "sortNo": null, 
    "permission": null, 
    "moduleId": 1, 
    "parentName": null, 
    "leaf": 1, 
    "typeName": null, 
    "permissionText": null, 
    "menuBeans": null 
   } 
  ] 
 } 
] 

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