// 通过给定的集合List<Webkpi> datas,得到json字符串(横坐标) public static String getCategory(List<WebKpi> datas) { StringBuffer sb = new StringBuffer(); sb.append("["); int size = datas.size(); for (int i = 0; i < size; i++) { WebKpi idw = datas.get(i); sb.append("\"" + DateUtils.dateToSimpleDateStr(idw.getTime(), "yyyy-MM-dd EE") + "\""); if (i != (size - 1)) { sb.append(","); } } sb.append("]"); JSONArray ja = JSONArray.fromObject(sb.toString()); return ja.toString(); }