String类型转List<Integer>

public static void main(String[] args) {
        String a ="1,2,3,4,5";
        List<Integer> integers = stringToList(a);
        integers.forEach(s-> System.out.println(s));
    }


//String   转 List<Integer>
private static List<Integer> stringToList(String strs){
        String[] a= strs.split(",");
        int[] array = Arrays.stream(a).mapToInt(Integer::parseInt).sorted().toArray();
        List<Integer> listx = Arrays.stream(array).boxed().collect(Collectors.toList());
        return listx;
    }

List<T> list=JSONArray.parseArray("",T.class);
其中T为要转为的list其中的对象，比如创建的实体类。

//  String 转list
private List<String> stringToList(String strs){
   　　String str[] = strs.split(",");
 　　  return Arrays.asList(str);

}

// List<IdAndNameDto> 转 Map<Integer,List<String>>

Map<Integer, List<String>> storeNameMap = baiShiOrderNo
        .stream()
        .collect(Collectors.toMap(IdAndNameDto::getId,x->{
            List<String> list = new ArrayList<>();
            list.add(x.getName());
            return list;
        },(item1, item2) ->{
            item1.addAll(item2);
            return item1;
        }));

    /** 对list分组. */
    public static <K extends Comparable, V> TreeMap<K, List<V>> groupAndSort(
            List<V> list, Function<V, K> groupFunction) {
        TreeMap<K, List<V>> map = Maps.newTreeMap();
        if (list == null || list.isEmpty()) {
            return map;
        }

        for (V v : list) {
            if (v == null) {
                continue;
            }

            K k = groupFunction.apply(v);
            if (k == null) {
                continue;
            }

            List<V> groupList = map.get(k);
            if (groupList == null) {
                groupList = Lists.newLinkedList();
                map.put(k, groupList);
            }

            groupList.add(v);
        }

        return map;
    }

    //list转map
    TreeMap<Integer, List<UserProfileWedplanner>> rawMap =
            MijMap.groupAndSort(rawList, UserProfileWedplanner::getDataTypeCode);

// String 转 转实体类
String a ="{"traceLogs":[{"mailNo":"50634526168078","traces":{"trace":[{"acceptAddress":"北京市","acceptTime":"2013-12-31 22:41:47","remark":"北京市【中关村软件园分部】，【中关村软件园分部-客服/0000】已揽收","scanType":"收件"},{"acceptAddress":"北京市","acceptTime":"2014-01-01 02:24:24","remark":"到北京市【北京转运中心】","scanType":"到件"},{"acceptAddress":"北京市","acceptTime":"2014-01-01 13:24:59","remark":"北京市【北京转运中心】，正发往【潍坊转运中心】","scanType":"发件"},{"acceptAddress":"潍坊市","acceptTime":"2014-01-01 21:42:31","remark":"到潍坊市【潍坊转运中心】","scanType":"到件"},{"acceptAddress":"潍坊市","acceptTime":"2014-01-02 02:47:05","remark":"潍坊市【潍坊转运中心】，正发往【滨州】","scanType":"发件"},{"acceptAddress":"滨州市","acceptTime":"2014-01-02 08:22:48","remark":"到滨州市【滨州】","scanType":"到件"},{"acceptAddress":"滨州市","acceptTime":"2014-01-02 18:47:06","remark":"滨州市【滨州】，字草 已签收","scanType":"签收"}]},"check":false,"problems":{"problem":[{"seqNum":1,"problemCause":"请提供一个可联系的电话","noticeSite":"中关村软件园分部","problemType":"联系不上收件人","registerMan":"系统管理员","registerDate":"2017-01-11 16:31:19","registerSite":"西湖一部"}]}}]}";
//jsonArray 转成数组
//JSONArray pdfArray = JSONArray.parseArray(a);
//获取数组下标为0的
//String pdfArrayOne = pdfArray.getString(0);
BaiShiOrderPrintVo pdf = JSONObject.parseObject(a, BaiShiOrderPrintVo.class);

//String 转实体类

private PpsPdfInfoConstants conversionPdfInfo(String pdfInfo) {
    JSONArray pdfArray = JSONArray.parseArray(pdfInfo);
    String pdfArrayOne = pdfArray.getString(0);
    JSONArray jsonArray = JSONObject.parseObject(pdfArrayOne, JSONArray.class);
    String jsonData = jsonArray.getString(0);
    PpsPdfInfoConstants pdf = JSONObject.parseObject(jsonData, PpsPdfInfoConstants.class);
    return pdf;
}