import java.util.Random;
/**
* @author: Administrator
* @Description: java生成一个6位的随机数（验证码）
*/
public class RandomCode {
public static void main(String[] args) {
String str="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
StringBuilder sb=new StringBuilder(6);
for(int i=0;i<6;i++)
{
char ch=str.charAt(new Random().nextInt(str.length()));
sb.append(ch);
}
System.out.println(sb.toString());
}
}