自定義表單驗證註解不起作用

Question

我創建了自定義表單驗證註釋，以檢查表單中填寫的日期是否爲格式dd/MM/yyyy。不幸的是，它不起作用，驗證失敗，我試着用任何日期格式。最初，我認爲問題是我用來測試的正則表達式，但在做了一些測試之後，我很確定它的工作原理。

我錯過了什麼？這裏是我的代碼（我只複製了相關部分），請幫助我理解我做錯了什麼：

豆Articolo（注：這個類是嵌套模型類NewEditArticle內，下同）

@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; 

類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 
} 

類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; 
     } 
    } 

} 

模型類

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"); 
     } 

彈簧調度-servlet.xml中

<bean id="messageSource" 
     class="org.springframework.context.support.ResourceBundleMessageSource"> 
     <property name="basename" value="messages" /> 
    </bean> 

Answer 1

你可以做，沒有正則表達式。 Spring有@DateTimeFormat註釋。在你的模型中執行以下操作。

@NotNull(message = "Please enter Birth Date") 
@DateTimeFormat(pattern = "dd/MM/yyyy") 
private Date birthDate; 

您可以添加自定義錯誤消息。在資源文件夾下創建message.properties。在這個文件裏面：

typeMismatch=Invalid date format 

重要的一點是將此添加到配置類。

@Bean 
public MessageSource messageSource() { 
    ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource(); 
    messageSource.setBasename("messages"); 
    return messageSource; 
}