Java数据聚合问题

public class Demo {

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

    HashMap<Object, Object> m1 = new HashMap<>();
    m1.put("month","2020-06");
    m1.put("plan_working_hours",272.5);
    m1.put("month_total_working_hours",120);
    m1.put("project_code","ToB-APP");
    m1.put("this_years_total_working_hours",287);
    m1.put("project_name","B端APP框架");
    m1.put("total_working_hours",307);


    HashMap<Object, Object> m2 = new HashMap<>();
    m2.put("month","2020-07");
    m2.put("plan_working_hours",272.5);
    m2.put("month_total_working_hours",93);
    m2.put("project_code","ToB-APP");
    m2.put("this_years_total_working_hours",287);
    m2.put("project_name","B端APP框架");
    m2.put("total_working_hours",307);



    HashMap<Object, Object> m3 = new HashMap<>();
    m3.put("month","2020-11");
    m3.put("plan_working_hours",104);
    m3.put("month_total_working_hours",16);
    m3.put("project_code","1001");
    m3.put("this_years_total_working_hours",67);
    m3.put("project_name","C端底座");
    m3.put("total_working_hours",150);


    HashMap<Object, Object> m4 = new HashMap<>();
    m4.put("month","2020-12");
    m4.put("plan_working_hours",104);
    m4.put("month_total_working_hours",51);
    m4.put("project_code","1001");
    m4.put("this_years_total_working_hours",67);
    m4.put("project_name","C端底座");
    m4.put("total_working_hours",150);


    ArrayList<Map> maps = new ArrayList<>();

    maps.add(m1);
    maps.add(m2);
    maps.add(m3);
    maps.add(m4);
    
    //todo 做数据聚合(
    // 将project_name值相同的数据中的month和month_total_working_hours聚合到一个list中
    // 每个project_name只有一个map数据)
    /**
     * 格式如下
     * 
     * {
     *     "monthList": ["2020-06":120 ,"2020-07":93]
     *     "plan_working_hours": 272.5,
     *     "project_code": "ToB-APP",
     *     "this_years_total_working_hours": 287,
     *     "project_name": "B端APP框架",
     *     "total_working_hours": 307
     *   },
     */
    
}

}

        Map<String,Object> one = Maps.newHashMap();
        one.put("one",1);
        one.put("two",2);

        Map<String,Object> two = Maps.newHashMap();
        two.put("one",1);
        two.put("two",2);
        List<Map<String,Object>> list = Lists.newArrayList();
        list.add(one);
        list.add(two);
        Set<String> keySet = one.keySet();
        Map<String, List<Object>> result = list.stream().reduce(new HashMap<>(), (s, o) -> {
            keySet.forEach(a -> {
                if (s.containsKey(a)) {
                    List<Object> value = s.get(a);
                    value.add(o.get(a));
                } else {
                    List<Object> value = Lists.newArrayList();
                    value.add(o.get(a));
                    s.put(a, value);
                }
            });
            return s;
        }, (s, o) -> s);
        System.out.println(result);

/*先根据project_name分组*/
Map<Object,java.util.List<Map>> result = maps.stream()
        .collect(Collectors.groupingBy(d -> d.get("project_name").toString() ));

/*
* result返回示例
* {"B端APP框架":[{"month":"2020-06","plan_working_hours":272.5,"month_total_working_hours":120,"project_code":"ToB-APP","this_years_total_working_hours":287,"project_name":"B端APP框架","total_working_hours":307},{"month":"2020-07","plan_working_hours":272.5,"month_total_working_hours":93,"project_code":"ToB-APP","this_years_total_working_hours":287,"project_name":"B端APP框架","total_working_hours":307}],"C端底座":[{"month":"2020-11","plan_working_hours":104,"month_total_working_hours":16,"project_code":"1001","this_years_total_working_hours":67,"project_name":"C端底座","total_working_hours":150},{"month":"2020-12","plan_working_hours":104,"month_total_working_hours":51,"project_code":"1001","this_years_total_working_hours":67,"project_name":"C端底座","total_working_hours":150}]}
* */

/*用于最外层添加数据*/
JSONArray array = new JSONArray();

/*循环最外层， 也就是project_name这一层， 有几个project_name就循环几次*/
result.forEach((key,value)->{
    JSONObject jsonObject = new JSONObject();
    /*listMap其实就是你上面加到List的数据， 一共四条*/
    List<Map> listMap = (List<Map>) value;
    listMap.forEach(item->{
        /*item就是一个一个map  ：  project_code","ToB-APP"   this_years_total_working_hours",287   .....*/
        item.forEach((i,v) -> {
            /*key值是month和month_total_working_hours根据要求特殊处理*/
            if(StringUtils.equalsAny(i.toString(),"month","month_total_working_hours")){
                Map<Object,Object> spa = new HashMap<>(16);
                if(ObjectUtils.allNotNull(jsonObject.get("monthList"))){
                    spa = JSON.parseObject((String)jsonObject.get("monthList"),Map.class);
                }
                spa.put(i , v);
                jsonObject.put("monthList", JSON.toJSONString(spa));
            }
        });
        jsonObject.put("project_code",item.get("project_code"));
        jsonObject.put("this_years_total_working_hours",item.get("this_years_total_working_hours"));
        jsonObject.put("project_name",item.get("project_name"));
        jsonObject.put("total_working_hours",item.get("total_working_hours"));
    });
    array.add(jsonObject);
} );

加了点注释 ， 可能不是最优解，应该还有更优的解法。
JSON格式太乱 ，用JSON在线格式化格式化以后再看