Freemarker如何生成树形导航菜单（递归）

叁歲伎倆 2022-05-16 02:05 285阅读 0赞

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> 
        <tr> 
         <td> 
          <input type="checkbox" name="ids" value="${menu.id}" /> 
         </td> 
         <td> 
       <span title="${menu.name!}" style="margin-left: ${menu.leaf * 30}px;[#if menu.leaf == 0] color: #000000;[/#if]"> 
       ${menu.menuName!} 
       </span> 
         </td> 
         <td> 
         ${menu.url!} 
         </td> 
         <td> 
         ${menu.permissionText!} 
         </td> 
         <td> 
         ${menu.sortNo!} 
         </td> 
         <td> 
          <a href="edit.jhtml?id=${menu.id}">[编辑]</a> 
         </td> 
        </tr> 
       <#if menu.menuBeans?? && menu.menuBeans?size gt 0> 
        <@menuTree menus = menu.menuBeans/> 
       </#if> 
       </#list> 
      </#if> 
     </#macro> 
     
    <@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
       } 
      ] 
     } 
    ]