数字四舍五入

 /** * 四舍五入 * @param val 值 * @param precision 小数点保留位数 * @return */ public static Double roundDouble(double val, int precision) { Double ret = null; try { double factor = Math.pow(10, precision); ret = Math.floor(val * factor + 0.5) / factor; } catch (Exception e) { e.printStackTrace(); } return ret; }