Java获取四位随机验证码方法。
public class RandomTest{
private static Random random = new Random();
public static String getRandomNumber(String[] range,int rangeLength,int length){
StringBuffer sb = new StringBuffer();
for(int i=0;i<length;i++){
sb.append(String.valueOf(range[random.nextInt(rangeLength)]));
}
return sb.toString();
}
public static void main(String[] args) {
String[] range = {“0″,”1″,”2″,”3″,”4″,”5″,”6″,”7″,”8″,”9″,”a”,”b”,”c”,”d”,”e”,”f”,”g”,”h”,”i”,”j”,”k”,};
System.out.println(getRandomNumber(range, range.length, 4));
}
}