Model:
public class UserBean { @JsonProperty private String userId; @JsonProperty private int limit; @JsonProperty private int page; public String getUserId() { return userId; } public void setUserId(String userId) { this.userId = userId; } public int getLimit() { return limit; } public void setLimit(int limit) { this.limit = limit; } public int getPage() { return page; } public void setPage(int page) { this.page = page; } } public class ResponseJSON { private Map<String, Object> response = new LinkedHashMap<String, Object>(); public void setStatus(String status) { response.put("status", status); } public void setMessage(String message) { response.put("message", message); } public void add(String key, Object value) { response.put(key, value); } public Map<String, Object> get() { return this.response; } } Controller:
@ResponseBody @RequestMapping(value = "/user/products", method = RequestMethod.POST) public Object getProductListByUser(@RequestBody UserBean userBean) { ResponseJSON responseJSON = new ResponseJSON(); try { List<Object> result = userRepository.getProductListByUser(userBean); int resultCount = result.size(); List<Object> productList = new ArrayList<Object>(); for (int i = 0; i < resultCount; i++) { ProductInfo product = (ProductInfo) result.get(i); Map<String, Object> productInfo = new LinkedHashMap<String, Object>(); productInfo.put("id", product.getId()); productInfo.put("title", product.getTitle()); productInfo.put("description", product.getDescription()); productInfo.put("iconImage", product.getIconImage()); productInfo.put("updateDatetime", product.getUpdateDatetime()); productInfo.put("createDatetime", product.getCreateDatetime()); productList.add(productInfo); } responseJSON.setStatus(Constants.SUCCESS); responseJSON.add("items", productList); } catch (Exception e) { responseJSON.setStatus(Constants.FAIL); responseJSON.setMessage(e.getMessage()); logger.error(e.getMessage()); } return responseJSON.get(); } Repository:
@SuppressWarnings("unchecked") @Transactional public List<Object> getProductListByUser(UserBean userBean) { Session session = sessionFactory.getCurrentSession(); Criteria criteria = session.createCriteria(ProductInfo.class, "product") .createAlias("product.productOptions", "options", CriteriaSpecification.LEFT_JOIN) .add(Restrictions.eq("product.userId", userBean.getUserId())) .addOrder(Order.asc("productOptions.size")) .setFirstResult((userBean.getPage() - 1) * userBean.getLimit()); .setMaxResults(userBean.getLimit()); return criteria.list(); } I'm developing some back-end APIs. This API returns product lists of some user. Purpose of this API is returning result of JSON data. So, I get datas from repository and assign to ResponseJSON object in the controller. Is this approach efficient or not? Which way is better?
