生成N位验证码

[java]代码库

	/**
	 * 
	 * TODO 方法作用：生成N位验证码
	 * @return
	 * @Author: 刘泽中
	 * @Date: 2015-8-27 上午11:59:56
	 */
	public String buildRandN(int N) {
		String rand = "";
		for (int i = 0; i < N; i++) {
			int ran = (int) (Math.random() * 10);
			String random = String.valueOf(ran);
			rand += random;
		}
		return rand;
	}