package com.zhiyou100.util;
import java.util.Random;
public class Picture {
public static void main(String[] args) {
Random ran=new Random();
char ch[] =new char[]
{'a','b','c','d','e','f','g','@','1','2','3','4','5'};
StringBuilder str=new StringBuilder("");
for(int i=0;i<4;i++){
str.append(ch[ran.nextInt(ch.length)]);
}
System.out.println("验证码="+str);
}
}
在控制台上随机输出验证码