我只知道用java:

import java.util.Random;

public class yanzhengma {
    public static void main(String[] args) {
        Character[] chs=new Character[10+26+26];
        int index=0;
        for(char i='a';i<='z';i++){
            chs[index]=i;
            index++;
        }
        for(char i='A';i<='Z';i++){
            chs[index]=i;
            index++;
        }
        for(char i='0';i<='9';i++){
            chs[index]=i;
            index++;
        }
        System.out.println("你产生的验证码为：");
        Random r=new Random();
        for(int i=1;i<=5;i++){
            int sb=r.nextInt(chs.length);
            System.out.print(chs[sb]);
            if(i%100==0) System.out.println("");
        }
    }
}