Java随机生成手机短信验证码

简单版 /** * 产生4位随机数(0000-9999) * * @return 4位随机数 / public static String getFourRandom() { return StringUtils.leftPad(new Random().nextInt(10000) + “”, 4, “0”); }复杂版 /* * 创建指定数量的随机字符串 * @param numberFlag 是否是数字 * @param length * @return */ public static String createRandom(boolean numberFlag, int length){ String retStr = “”; String strTable = numberFlag ? “1234567890” : “1234567890abcdefghijkmnpqrstuvwxyz”; int len = strTable.length(); boolean bDone = true; do { retStr = “”; int count = 0; for (int i = 0; i < length; i++) { double dblR = Math.random() * len; int intR = (int) Math.floor(dblR); char c = strTable.charAt(intR); if ((‘0’ <= c) && (c <= ‘9’)) { count++; } retStr += strTable.charAt(intR); } if (count >= 2) { bDone = false; } } while (bDone); return retStr; }