如何修复接受额外空白输入的Scanner类

Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine().trim();

Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine();
while (input.trim().isEmpty()) {
    System.out.println("输入不能为空，请重新输入：");
    input = scanner.nextLine();
}

Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine();
while (!input.matches("\\S+")) {
    System.out.println("输入不能为空，请重新输入：");
    input = scanner.nextLine();
}