使用treeMap傳參,實現字典序排列計算簽名並呼叫請求

		// 轉發獲取角色等級請求
		Map<String, String> params = new TreeMap<String, String>();
		params.put("zoneId", zoneId);
		params.put("roleId", roleId);
		params.put("appId", Constant.appId);
		String timestamp = System.currentTimeMillis() + "";
		params.put("timestamp", timestamp);

		// 接收響應
		String response = HttpClientUtils.signAndGet(Constant.level, params);
		Map<String, Object> responseMap = JSON.parseObject(response);

		// 狀態碼不為1000丟擲異常
		if ((int) responseMap.get("code") != 1000) {
			throw new RRException((String) responseMap.get("msg"));
		}
		Map<String, Object> dataMap = (Map<String, Object>) responseMap.get("data");
		String levelString = (String) dataMap.get("level");
		return Integer.parseInt(levelString);
		
		public static String signAndGet(String url, Map<String, String> params){
		    String sign = SignUtils.sign(params);
	    	params.put("sign", sign);
		    return doGet(url, params);
	    }
		public static String sign(Map<String, String> params) {
		    StringBuffer sb = new StringBuffer();
		    Iterator<Entry<String, String>> iter = params.entrySet().iterator();
		    while (iter.hasNext()) {
			    Entry<String, String> entry = (Entry<String, String>) iter.next();
			    sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
		    }
		    sb.append("key=" + Constant.key);
		    String sign = sb.toString();
		    sign = MD5Utils.string2MD5(sign).toUpperCase();
		    return sign;
	    }