Map支持path路徑查詢數據

    public static Object getPath(Map<String, Object> map, String path) {
        if (path == null || path.length() == 0) {
            return null;
        }
        String[] paths = path.split("\\.");
        Object newObj = null;

        for (int i = 0; i < paths.length; i++) {
            String s = paths[i];
            if (i == 0) {
                newObj = map.get(s);
                continue;
            }
            newObj = getObject(newObj, s);

        }
        return newObj;
    }

    private static Object getObject(Object newObj, String s) {
        if (newObj instanceof Map) {
            return ((Map) newObj).get(s);
        }
        if (newObj instanceof List) {
            List<Object> list = new ArrayList<>();
            List<Object> o = (List<Object>) newObj;
            for (Object object : o) {
                list.add(getObjectFromList(object, s));
            }
            return list;
        }
        if (newObj instanceof JSONObject) {
            return ((JSONObject) newObj).getInnerMap().get(s);
        }
        if (newObj instanceof JSONArray) {
            List<Object> list = new ArrayList<>();
            List<Map> o = (List<Map>) newObj;
            for (Map map1 : o) {
                list.add(map1.get(s));
            }
            return list;
        }
        return newObj;
    }

    public static Object getObjectFromList(Object object, String s) {
        if (object instanceof Map) {
            return ((Map) object).get(s);
        }
        if (object instanceof List) {
            List<Object> list = new ArrayList<>();
            List<Object> o1 = (List<Object>) object;
            for (Object o2 : o1) {
                list.add(getObjectFromList(o2, s));
            }
            return list;
        }
        return object;
    }

 public static void main(String[] args) throws Exception {

        //Map maps = (Map<String, Object>) JSON.parseObject(json, Map.class);


        Map<String, Object> maps = new HashMap<>();

        Map<String, Object> a1 = new HashMap<>();
        List<Map<String, Object>> list1 = new ArrayList<>();
        Map<String, Object> a4 = new HashMap<>();
        a4.put("test", "cs");
        list1.add(a4);
        Map<String, Object> a5 = new HashMap<>();
        a5.put("test", "cf");
        list1.add(a5);
        a1.put("materialClass", list1);
        Map<String, Object> a2 = new HashMap<>();
        List<Map<String, Object>> list2 = new ArrayList<>();
        Map<String, Object> a6 = new HashMap<>();
        a6.put("test", "aa");
        list2.add(a6);
        Map<String, Object> a7 = new HashMap<>();
        a7.put("test", "bb");
        list2.add(a7);
        a2.put("materialClass", list2);
        List<Map<String, Object>> list = new ArrayList<>();
        list.add(a1);
        list.add(a2);

        Map<String, Object> a3 = new HashMap<>();
        a3.put("subList", list);
        maps.put("data", a3);

        //System.out.println(jsonMapper.writeValueAsString(maps));

        Object o = getPath(maps, "data.subList.materialClass");
        //Object o1 = getPath(maps, "data.subList");
        //Map<String, Object> root = new HashMap<>();

        //set(root, "test.a", o1);
        //System.out.println(jsonMapper.writeValueAsString(root));
        //
        //
        //set(root, "test.a.materialClass.test", "aa");
        //System.out.println(jsonMapper.writeValueAsString(root));


    }

主要解決了子表嵌套獲取不到數據的問題。