产生随机验证码

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				int sjs = 6; //指定几位随机数
				int count = 0;
				char str[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
				StringBuffer pwd = new StringBuffer("");
				Random r = new Random();
				while (count < sjs) {
					int i = Math.abs(r.nextInt(10));
					if (i >= 0 && i < str.length) {
						pwd.append(str[i]);
						count++;
					}
				}
				System.out.println("六位随机数: "+pwd);