生成指定长度的随机字符串
/**
* 随机产生一个length长度的a-Z和0-9混合字符串
*
* @param length 长度
* @return 随机字符串
*/
public static String generateRandomStr(int length) {
String base = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
Random random = new Random();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < length; i++) {
int number = random.nextInt(base.length());
sb.append(base.charAt(number));
}
return sb.toString();
}
