1、遞歸獲取層級代碼
1、查詢出所有的權限
2、創建一個集合存放所有的一級菜單
1.1、 遍歷一級菜單
//遞歸
for (MerPermissionVo pid : parentList) {
List<MerPermissionVo> childList = dgPermissionList(allList, pid.getId());
pid.setSubList(childList);
}
1.2、遞歸方法
/**
* @Author: Lee
* @Description: 遞歸權限
* @Date: 2020/2/22
* @Param: [PermissionList, parentId]
* @Return: java.util.List<com.qinwell.youxuan.provider.vo.MerPermissionVo>
**/
private static List<MerPermissionVo> dgPermissionList(List<MerPermissionVo> PermissionList, Integer parentId) {
List<MerPermissionVo> childList = new ArrayList<>();
for (MerPermissionVo c : PermissionList) {
if (null != c && null != c.getId() && null != c.getParentId()) {
int id = c.getId();
int pid = c.getParentId();
if (parentId == pid) {
List<MerPermissionVo> childs = dgPermissionList(PermissionList, id);
//二級菜單下所有的數據
c.setSubList(childs);
//把二級菜單放入到二級菜單彙總集合
childList.add(c);
}
}
}
return childList;
}
執行完之後parentList就保存了所有的下級及下下級
2、第二種方式 (省市區)
//查詢
QueryWrapper<BaseProvince> queryWrapper = new QueryWrapper<>();
//id=1的數據是中國,頁面上不需要展示中國,排除
queryWrapper.ne("id", 1);
List<BaseProvince> provinceAllList = baseProvinceMapper.selectList(queryWrapper);
//轉換
HashMap<Integer, BaseProvinceVo> tmpMap = provinceAllList.stream().map(province -> {
BaseProvinceVo provinceVo = new BaseProvinceVo();
provinceVo.setId(province.getId())
.setLabel(province.getProvinceName())
.setValue(province.getProvinceId());
return provinceVo;
}).collect(Collectors.toMap(BaseProvinceVo::getValue, Function.identity(), (o1, o2) -> o1, HashMap::new));
//處理
List<BaseProvinceVo> provinceList = Lists.newArrayListWithCapacity(40);
provinceAllList.forEach(record -> {
BaseProvinceVo parent = tmpMap.get(record.getProvinceParentId());
BaseProvinceVo child = tmpMap.get(record.getProvinceId());
if (null == parent) {
provinceList.add(child);
} else {
parent.addSub(child);
}
});
執行完之後,provinceList中就包含了一級及下級數據。