//1.傳入parentIdpublic List<Map<String, Object>> buildTree(Integer parentId) throws DBException { //2.定義一個List:tree,最后要返回這個List:tree List<Map<String, Object>> tree = new ArrayList<Map<String, Object>>(); //3.如果這個parentId為空，就令parentId=根Id if ( null == parentId) parentId = Constants.TREE_ROOT_ID; //4.根據這個parentId得到一級目錄:list List<RelicsDataDictPo> list = listByParentId(parentId); if (list.isEmpty()) return tree;//判斷：如果是最后一級 //5.根據根目錄list映射出一級目錄的：id,name,parentId for (RelicsDataDictPo obj : list) { //6.定義一個map:用以存儲一級目錄的信息，包括id Map<String, Object> map = new HashMap<String, Object>(); map.put("id", obj.getAutoId()); map.put("name", obj.getDictName()); map.put("parentId", obj.getParentId()); //7.將以這個目錄的id作為parentId，遞歸建樹，重回第一步 List<Map<String, Object>> subs = buildTree(obj.getAutoId()); if (!subs.isEmpty()) { map.put("children", subs); } tree.add(map); } return tree;}
