java List数据转换为json类型数据
try {//从数据库中取出List数据 List<CarouselImage> carouselImageList = (List<CarouselImage>) this.carouselImageService.carouselImageList(); List<CarouselImageInfo> list = new ArrayList<CarouselImageInfo>(); // for (int i = 0; i < carouselImageList.size(); i++) { CarouselImage a = carouselImageList.get(i); if (a != null && a != new CarouselImage()) { //依次循环放入对应已写好的类中 CarouselImageInfo b = new CarouselImageInfo(); b.setId(a.getId()); b.setLink(a.getLink()); b.setOrderBy(a.getOrderBy()); b.setAppImageUrl(a.getAppImageUrl()); list.add(b); } } //转为Json JSONArray jsonList = JSONArray.fromObject(list); JSONObject obj = new JSONObject(); JSONObject j = new JSONObject(); obj.accumulate("carouselImageList", jsonList); j.accumulate("resultCode", "1"); j.accumulate("responseObject", obj); PrintWriter pw = response.getWriter(); pw.print(j); } catch (Exception e) { JSONObject j = new JSONObject(); try { PrintWriter pw = response.getWriter(); JSONObject errObj = new JSONObject(); j.accumulate("resultCode", "0"); j.accumulate("errorMessage", e.getMessage()); pw.print(j); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } return null; }
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