驗證

Spring Shell 與 Bean Validation API 整合，支援對命令引數進行自動和自文件化的約束。

命令引數和方法級別的註解會得到遵守，並在命令執行之前觸發驗證。考慮以下命令

	@ShellMethod("Change password.")
	public String changePassword(@Size(min = 8, max = 40) String password) {
		return "Password successfully set to " + password;
	}

從前面的示例中，您免費獲得以下行為

shell:>change-password hello
The following constraints were not met:
	--password : size must be between 8 and 40 (You passed 'hello')