将列表<Object[]>转换为JSON

Question

大家好！

有人可以帮助我，如何将我的 HQL 查询结果转换为带有对象列表的 JSON 并通过其余服务获取它。

这是我的服务方法，它返回qyery结果列表：

   @Override
    public List<Object[]> getAllDepartments() {
        List<Object[]> list;
        Query query =  entityManager.createQuery("SELECT dp.name, avg (wr.salary) FROM Worker wr join wr.department dp GROUP BY dp.name");
        list =  query.getResultList();
        return list;
    }

还有我的 Spring RESTfull 控制器：

@RequestMapping(value = "/all", method = RequestMethod.GET)
@ResponseBody
public JsonNode getAllDeps() {
    List<Object[]> list  = departmentService.getAllDepartments();
    ObjectMapper objectMapper = new ObjectMapper();
    Map<String, Integer> resultMap = new HashMap<String, Integer>(list.size());
    for (Object[] result : list)
        resultMap.put((String)result[0], ((Double)result[1]).intValue() );
    final JsonNode json = objectMapper.valueToTree(resultMap);
    return json;
}

现在我的服务用如下所示的数据响应我的 json ： {“安全”：1500，“经济”：1850，“IT”：2000}

但我需要那个（对象列表）：

[{name:"安全",工资:"1500"},{name:"经济",工资:1850},{name:"IT",工资:2000}]

感谢您的帮助。

Answer 1

只需从控制器方法返回列表

@RequestMapping(value = "/all", method = RequestMethod.GET)
@ResponseBody
public List<Object[]> getAllDeps() {
    List<Object[]> list  = departmentService.getAllDepartments();
    return list;
}

@ResponseBody

注释可以为您进行转换。

Answer 2

public JSONObject findOccurrByFileUUID(UUID filePefin) throws JSONException {

    StringBuilder strQuery = new StringBuilder();
    strQuery.append("SELECT c.\"name\" AS creditorname, d.\"name\" AS debtorname, concat(b2.\"type\",'-',b2.\"number\",'-',b2.parcel) AS docto, b2.uniquenumber, to_char(b.dateoccurr,'DD/MM/YYYY HH24:MI:SS') AS dateoccur, to_char(b.createddate, 'DD/MM/YYYY HH24:MI:SS') AS createddate, b.statusnegatived, l.username FROM billnegativedoccurr b \n" +
                    "LEFT JOIN billnegatived b2 ON b2.uuid = b.billnegativeduuid \n" +
                    "LEFT JOIN creditor c ON c.tenantowner_uuid = b2.tenant_uuid AND c.uuid = b2.creditor_uuid \n" +
                    "LEFT JOIN debtor d ON d.tenantowner_uuid = b2.tenant_uuid AND d.uuid = b2.debtor_uuid \n" +
                    "INNER JOIN login l ON l.uuid = b.useroccurr \n" +
                    "WHERE b.filepefinuuid = :filePefin");

    Query query = eM.createNativeQuery(strQuery.toString()); //no entity mapping
    query.setParameter("filePefin", filePefin);
    List<Object[]> queryList = query.getResultList();
    JSONArray array = new JSONArray();
    JSONObject obj = new JSONObject();

    for (Object[] result : queryList) {

        JSONObject object = new JSONObject();
        object.put("creditorName", result[0]);
        object.put("debtorName", result[1]);
        object.put("docto", result[2]);
        object.put("uniquenumber", result[3]);
        object.put("dateoccur", result[4]);
        object.put("createddate", result[5]);
        object.put("statusnegatived", result[6]);
        object.put("username", result[7]);

        array.put(object);
    }

    return obj.put("Values", array);
}