protected void validateRequired(String field, String errorKey, String errorMessage) {
		String value = controller.getPara(field);
		if (value == null || "".equals(value)) {	// 经测试,form表单域无输入时值为"",跳格键值为"\t",输入空格则为空格" "
			addError(errorKey, errorMessage);
		}
	}
protected void validateRequired ( String field , String errorKey , String errorMessage ) { String value = controller . getPara ( field ) ; if ( value == null || "" . equals ( value ) ) { addError ( errorKey , errorMessage ) ; } }
Validate Required. Allow space characters.