JSONObject、JSONArray结合Map的使用案例
jopen
10年前
1、Service中的实现方法：
JSONObject中有字符串，有JSONArray数组，而JSONArray数组中还有JSONObject。
/** 根据账号查询所持有的卡列表 * @param weChatId * @return * {"Return":true,"list":[{"cardNo":"4047390001058975","cardtexts":"4047****8975","rule":{"cardDescribe":"","cardProductId":"","isGift":"","rules":"","state":0}},{"cardNo":"4564180001056860","cardtexts":"4564****6860","rule":{"cardDescribe":"","cardProductId":"","isGift":"","rules":"","state":0}},{"cardNo":"4564180001005206","cardtexts":"4564****5206","rule":{"cardDescribe":"","cardProductId":"","isGift":"","rules":"","state":0}},{"cardNo":"6221761700478669","cardtexts":"6221****8669","rule":{"cardDescribe":"","cardProductId":"","isGift":"","rules":"","state":0}},{"cardNo":"377186100023037","cardtexts":"3771****3037","rule":{"cardDescribe":"","cardProductId":"","isGift":"","rules":"","state":0}}]} */ public String queryCardNoList(String weChatId) { JSONObject result = new JSONObject(); result.put("Return", true);//将标识字符串放入JSONObject中 try { PwClientInfo pwClientInfo = CommonDao.getUserByWeChatId(weChatId); if (null != pwClientInfo) { CustomerCardRes res = CommonService.fetchLoopCustomerCardListNoCheckBlock(pwClientInfo, "", ""); List list = res.getResList(); CustomerCardResListObj obj = null; if (null != list && list.size() > 0) { JSONArray resultList = new JSONArray(); for (int i = 0; i < list.size(); i++) { obj = (CustomerCardResListObj) list.get(i); PwGiftPointRule r = GiftPointDao.queryPointRule(weChatId, obj.getCardNo1());//DAO返回对象 if (null == r || "1".equals(r.getIsGift())) { JSONObject j = new JSONObject(); j.put("cardNo", obj.getCardNo1());//取对象的部分属性放到JSONObject中 j.put("cardtexts", obj.getCardNo1().substring(0, 4) + "****" + obj.getCardNo1().substring(obj.getCardNo1().length() - 4, obj.getCardNo1().length())); j.put("rule", null == r ? new PwGiftPointRule() : r); resultList.add(j);//将多个JSONObject放入JSONArray中 } else { log.info(r.getCardProductId() + " " + obj.getCardNo1() + " " + r.getCardDescribe() + " 不参加活动！"); } } result.put("list", resultList);//将JSONArray再放入JSONObject中 } } } catch (Exception e) { result.put("Return", false); log.error("###获取卡列表异常！", e); } return result.toString();//最后将JSONObject转成字符串返回 } 2、部分servlet代码：
</div> </div>
</div> </div> 来自：http://blog.csdn.net/zuoyixiao/article/details/41284917
String result = ""; JSONObject json = null; result = queryCardNoList(weChatId);//调用service实现方法，获得返回的JSONObject字符串 json = JSONObject.fromObject(result);//将JSONObject字符串转换成JSONObject对象 if (json.getBoolean("Return")) { JSONArray jsa = json.getJSONArray("list");//获取JSONObject中保存的JSONArray数组 ArrayList<Map<String, String>> list = new ArrayList<Map<String, String>>(); for (int i = 0; i < jsa.size(); i++) {//遍历JSONArray数组 JSONObject cardObject = jsa.getJSONObject(i);//获得JSONArray数组中的JSONObject对象 PwGiftPointRule rules=(PwGiftPointRule) JSONObject.toBean(cardObject.getJSONObject("rule"), PwGiftPointRule.class); Map<String, String> m = new HashMap<String, String>();//将JSONObject转换成实体类，然后将获得的部分属性放入字符串Map中 m.put("cardNo", cardObject.getString("cardNo")); m.put("cardtexts", cardObject.getString("cardtexts")); m.put("rule", "".equals(rules.getRules())?"1":rules.getRules()); m.put("cardProductId", rules.getCardProductId()); m.put("cardDescribe", "".equals(rules.getCardDescribe())?"卡名称":rules.getCardDescribe()); list.add(m);//将Map放入ArrayList中 } request.setAttribute("cardList", list); //将ArrayList绑定到请求上并转发到页面 request.getRequestDispatcher("xxx.jsp").forward(request, response); } 3、部分jsp代码：
<select name="cardno" id="cardno"><--下拉框--> <option value=""> 请选择卡 </option> <% ArrayList al = (ArrayList) request.getAttribute("cardList");//获得绑定的ArrayList if (al != null) { Map<String, String> m = null; String CardNoShow = ""; for (int i = 0; i < al.size(); i++) { m = (Map<String, String>) al.get(i);//遍历出ArrayList %> <option value="<%=m.get("cardNo")%>" rule="<%=m.get("rule")%>" cardName="<%=m.get("cardDescribe") %>" cardProductId="<%=m.get("cardProductId") %>"><--根据Map中的key获得对象的属性--> <%=m.get("cardtexts")%> </option> <%}}%> </select>