JSONObject、JSONArray結合Map的使用案例

jopen 10年前發布 | 81K 次閱讀 JSON開發包 JSONObject

1、Service中的實現方法：

JSONObject中有字符串，有JSONArray數組，而JSONArray數組中還有JSONObject。

    /**  根據賬號查詢所持有的卡列表



 * @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);//將標識字符串放入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返回對象  
                    if (null == r || "1".equals(r.getIsGift())) {  
                        JSONObject j = new JSONObject();  
                        j.put("cardNo", obj.getCardNo1());//取對象的部分屬性放到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);//將多個JSONObject放入JSONArray中  
                    } else {  
                        log.info(r.getCardProductId() + " " + obj.getCardNo1() + " " + r.getCardDescribe() + " 不參加活動！");  
                    }  
                }  
                result.put("list", resultList);//將JSONArray再放入JSONObject中  
            }  
        }  
    } catch (Exception e) {  
        result.put("Return", false);  
        log.error("###獲取卡列表異常！", e);  
    }  
    return result.toString();//最后將JSONObject轉成字符串返回  
}  </pre><a class="CopyToClipboard" title="copy" href="/misc/goto?guid=4959619249942533732"></a></div>



</div>
</div>



2、部分servlet代碼：







</div>
</div>


    String result = "";

    JSONObject json = null;

    result = queryCardNoList(weChatId);//調用service實現方法，獲得返回的JSONObject字符串



json = JSONObject.fromObject(result);//將JSONObject字符串轉換成JSONObject對象  

if (json.getBoolean("Return")) {  
    JSONArray jsa = json.getJSONArray("list");//獲取JSONObject中保存的JSONArray數組  
    ArrayList<Map<String, String>> list = new ArrayList<Map<String, String>>();  
    for (int i = 0; i < jsa.size(); i++) {//遍歷JSONArray數組  
        JSONObject cardObject = jsa.getJSONObject(i);//獲得JSONArray數組中的JSONObject對象  
        PwGiftPointRule rules=(PwGiftPointRule) JSONObject.toBean(cardObject.getJSONObject("rule"), PwGiftPointRule.class);  
        Map<String, String> m = new HashMap<String, String>();//將JSONObject轉換成實體類，然后將獲得的部分屬性放入字符串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())?"卡名稱":rules.getCardDescribe());  
        list.add(m);//將Map放入ArrayList中  
       }  
       request.setAttribute("cardList", list);  //將ArrayList綁定到請求上并轉發到頁面                  
       request.getRequestDispatcher("xxx.jsp").forward(request, response);  
}  </pre><br />



3、部分jsp代碼：


 






 
<select name="cardno" id="cardno"><--下拉框-->  
    <option value="">  
            請選擇卡  
    </option>  
    <%  
        ArrayList al = (ArrayList) request.getAttribute("cardList");//獲得綁定的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);//遍歷出ArrayList  
    %>  
    <option value="<%=m.get("cardNo")%>" rule="<%=m.get("rule")%>" cardName="<%=m.get("cardDescribe") %>" cardProductId="<%=m.get("cardProductId") %>"><--根據Map中的key獲得對象的屬性-->  
            <%=m.get("cardtexts")%>  
        </option>  
        <%}}%>  
</select>  

</div>
</div>
來自：http://blog.csdn.net/zuoyixiao/article/details/41284917

                    

                    

                        
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