Question

我很难将json分组到日期特定组并进一步将结果分组到特定字段

这是json的例子

            {
              "list":[
                {
                  "category":"League",
                  "list":[
                    {
                      "id":16389,
                      "matchDesc":"1st Match",
                      "seriesId":2430,
                      "seriesDesc":"group A",
                      "category":"League",
                      "status":"",
                      "startDate":1460212200,
                      "teamAName":"Mumbai Indians",
                      "teamAShortName":"MUM",
                      "teamBName":"Rising Pune Supergiants",
                      "teamBShortName":"RPS",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16390,
                      "matchDesc":"2nd Match",
                      "seriesId":2430,
                      "seriesDesc":"group A",
                      "category":"League",
                      "status":"",
                      "startDate":1460298600,
                      "teamAName":"Kolkata Knight Riders",
                      "teamAShortName":"KOL",
                      "teamBName":"Delhi Daredevils",
                      "teamBShortName":"DEL",
                      "teamAImageId":0,
                      "teamBImageId":146957,
                      "isPrevDay":false
                    },
                    {
                      "id":16391,
                      "matchDesc":"3rd Match",
                      "seriesId":2430,
                      "seriesDesc":"group B",
                      "category":"League",
                      "status":"",
                      "startDate":1460385000,
                      "teamAName":"Kings XI Punjab",
                      "teamAShortName":"MOH",
                      "teamBName":"Gujarat Lions",
                      "teamBShortName":"GL",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16085,
                      "matchDesc":"South Group",
                      "seriesId":2422,
                      "seriesDesc":"group B",
                      "category":"League",
                      "status":"",
                      "startDate":1463702400,
                      "teamAName":"Essex",
                      "teamAShortName":"Ess",
                      "teamBName":"Surrey",
                      "teamBShortName":"Sur",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16086,
                      "matchDesc":"South Group",
                      "seriesId":2422,
                      "seriesDesc":"group C",
                      "category":"League",
                      "status":"",
                      "startDate":1463702400,
                      "teamAName":"Gloucestershire",
                      "teamAShortName":"Gloucs",
                      "teamBName":"Sussex",
                      "teamBShortName":"SUS",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16087,
                      "matchDesc":"South Group",
                      "seriesId":2422,
                      "seriesDesc":"group C",
                      "category":"League",
                      "status":"",
                      "startDate":1463702400,
                      "teamAName":"Kent",
                      "teamAShortName":"KENT",
                      "teamBName":"Somerset",
                      "teamBShortName":"SOM",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16412,
                      "matchDesc":"24th Match",
                      "seriesId":2430,
                      "seriesDesc":"group B",
                      "category":"League",
                      "status":"",
                      "startDate":1461853800,
                      "teamAName":"Mumbai Indians",
                      "teamAShortName":"MUM",
                      "teamBName":"Kolkata Knight Riders",
                      "teamBShortName":"KOL",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16413,
                      "matchDesc":"25th Match",
                      "seriesId":2430,
                      "seriesDesc":"group B",
                      "category":"League",
                      "status":"",
                      "startDate":1461940200,
                      "teamAName":"Rising Pune Supergiants",
                      "teamAShortName":"RPS",
                      "teamBName":"Gujarat Lions",
                      "teamBShortName":"GL",
                      "teamAImageId":0,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16414,
                      "matchDesc":"26th Match",
                      "seriesId":2430,
                      "seriesDesc":"group A",
                      "category":"League",
                      "status":"",
                      "startDate":1462012200,
                      "teamAName":"Delhi Daredevils",
                      "teamAShortName":"DEL",
                      "teamBName":"Kolkata Knight Riders",
                      "teamBShortName":"KOL",
                      "teamAImageId":146957,
                      "teamBImageId":0,
                      "isPrevDay":false
                    },
                    {
                      "id":16440,
                      "matchDesc":"52nd Match",
                      "seriesId":2430,
                      "seriesDesc":"group A",
                      "category":"League",
                      "status":"",
                      "startDate":1463754600,
                      "teamAName":"Delhi Daredevils",
                      "teamAShortName":"DEL",
                      "teamBName":"Sunrisers Hyderabad",
                      "teamBShortName":"HYD",
                      "teamAImageId":146957,
                      "teamBImageId":0,
                      "isPrevDay":false
                    }
                  ]
                }
              ]
            }

注意：我已经将json转换为gson，以便我可以使用pojo进行迭代但是我在分组时遇到困难

我希望输出为按日期排列的匹配项，并按“seriesDesc”字段分组

谢谢

编辑：我期待这个o / p比喻这个

11/08/2016 (considering system time and comparing with timeStamp of object 'startDate')
group A (Considering object 'seriesDesc')
match1
match2

groupB
match1
match2

groupC
match1
match2
match3

12/08/2016
 group A
 match1
 match2

 groupB
 match1
 match2

 groupC
 match1
 match2
 match3

注意：match = { “ID”：16389， “matchDesc”：“第一场比赛”， “seriesId”：2430 “seriesDesc”：“A组”， “类别”：“联盟”， “状态”：””， “的startDate”：1460212200， “teamAName”：“孟买印第安人”， “teamAShortName”： “妈妈”， “teamBName”：“崛起的浦那超级巨星”， “teamBShortName”： “RPS”， “teamAImageId”：0， “teamBImageId”：0， “isPrevDay”：假的 }

Answer 1

这就是我得到的：

String json = ...;

JsonElement el = new Gson().fromJson(json, JsonElement.class);
// Get inner list
JsonArray list = el.getAsJsonObject()
    .get("list").getAsJsonArray()
    .get(0).getAsJsonObject()
    .get("list").getAsJsonArray();

// Make into a regular list, so we can stream
List<JsonObject> objects = new ArrayList<>();
list.forEach(e -> objects.add(e.getAsJsonObject()));

// Group by date, then by series description
Map<LocalDate, Map<String, List<JsonObject>>> result = objects.stream()
    .collect(
        Collectors.groupingBy(
            e -> LocalDateTime.ofInstant(
                Instant.ofEpochSecond(e.get("startDate").getAsLong()),
                    ZoneId.systemDefault()
            ).toLocalDate(),
            Collectors.groupingBy(e -> e.get("seriesDesc").getAsString())
        )
    );      

// Sorted printing
result.entrySet().stream()
    .sorted(Map.Entry.comparingByKey())
    .forEach(date -> {
        System.out.println(date.getKey());
        date.getValue().entrySet().stream()
            .sorted(Map.Entry.comparingByKey())
            .forEach(group -> {
                System.out.println(group.getKey());
                group.getValue().forEach(System.out::println);
                System.out.println();
            });
    });

将json列表分组到日期并进一步分组到特定字段

1 个答案: