public String makeCheckCode() {StringBuffer sb = new StringBuffer();for (int i = 0; i < 5; i++) {int temp = (int) (Math.random() * 10);sb.append(temp);}return sb.toString();
}
final int duration = new Random().nextInt(60) * 1000;
/*获取一条随机字符串*/
public static String getRandomString(int length) { //length表示生成字符串的长度
String base = "abcdefghijklmnopqrstuvwxyz0123456789";
Random random = new Random();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int number = random.nextInt(base.length());
sb.append(base.charAt(number));
}
return sb.toString();
}