我创建了一个自定义表单验证注释,以检查表单中填写的日期是否为dd/MM/yyyy格式。不幸的是,它不起作用,我尝试的任何日期格式验证都失败了。最初我认为问题是我用于测试的正则表达式,但做了一些测试后,我很确定它的工作。
我错过了什么?以下是我的代码(我只复制了相关部分),请帮助我了解我做错了什么:
bean Articolo(注意:这个类嵌套在模型类NewEditArticle中,如下)
@Entity
@Table (name="Articolo")
public class Articolo {
@Column (name="Data")
@Temporal (TemporalType.DATE) //match the data type used in DB
@IsValidDate //check date format is dd/MM/yyyy (custom validator)
private Date data;
类IsValidDate
@Documented //mandatory
@Constraint (validatedBy= DateValidator.class) //this class contains the validation logic
@Retention (RetentionPolicy.RUNTIME) //mandatory
public @interface IsValidDate {
//error message
String message() default "Please insert date in format dd/mm/yyyy";
Class <?>[] groups() default {}; //mandatory
Class <? extends Payload> [] payload () default {}; //mandatory
}
类DateValidator public class DateValidator implements ConstraintValidator <IsValidDate, Date > {
@Override
public void initialize(IsValidDate isValidDate) {
// TODO Auto-generated method stub
}
@Override
public boolean isValid(Date data, ConstraintValidatorContext ctx) {
//convert Date data to String
String dateString=data.toString();
//format dd/MM/yyyy
String regex="(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\d\d)";
if (dateString.matches(regex)){
return true;
}
//if date doesn't match regex, return error message from IsValidDate
else {
return false;
}
}
}
模型类
public class NewEditArticolo {
//ATTRIBUTES
@Valid //requested to trigger validation of bean Articolo
private Articolo articolo;
private List<Area> ListaArea;
private List<Cucina> ListaCucina;
private List<Prezzo> ListaPrezzo;
private List<Voto> ListaVoto;
private List<String> ListaImg;
//METHODS
//CONSTRUCTOR
//create article model without ID number
//used in controller POST method
public NewEditArticolo () {
populateLists();
}
//create Article model based on ID number
//if ID=0 (new Article), creates empty model
//used in controller GET method
public NewEditArticolo(int ID) throws SQLException {
// call DAOArticolo.select only if article already exists
if (ID != 0) {
DAOArticolo DAOart = new DAOArticolo();
articolo = DAOart.select(ID);
}
populateLists();
}
控制器public String editArticle ( Model model,
@Valid @ModelAttribute (value="nea") NewEditArticolo nea, //create NewEditArticolo object, autowire attributes from ArticleManager.jsp, add to model and validate
BindingResult result, //collect validation errors
@RequestParam (value="submit") String submit){ //get input value from ArticleManager.jsp
Articolo articolo1=nea.getArticolo();
DAOArticolo daoArt = new DAOArticolo();
//if validation fails, return form to display validation errors
if (result.hasErrors()) {
System.out.println("VALIDATION FAILED");
return "ArticleManager";
}
else {
System.out.println("VALIDATION WAS SUCCESFULL");
}
Spring-dispatcher-servlet.xml
<bean id="messageSource"
class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename" value="messages" />
</bean>
不使用Regex也可以这样做。Spring有@DateTimeFormat
注释。在您的模型中执行以下操作:
@NotNull(message = "Please enter Birth Date")
@DateTimeFormat(pattern = "dd/MM/yyyy")
private Date birthDate;
您可以添加自定义错误消息。在resources文件夹下创建message.properties
。在这个文件里面:
typeMismatch=Invalid date format
重要的是将它添加到配置类中。
@Bean
public MessageSource messageSource() {
ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
messageSource.setBasename("messages");
return messageSource;
}