生成6位随机字符

private static String radomString(){
  String result="";  
        for(int i=0;i<6;i++){  
            int intVal=(int)(Math.random()*26+97);  
            result=result+(char)intVal;  
        }  
        return result;  
 }

生成6位随机数字

 private static int radomInt(){
    Random random = new Random();
    int x = random.nextInt(899999);
    int x = x+100000;
    return x;
 }