java - spring mvc javax.validation.UnexpectedTypeException : No validator could be found for type: java. lang.String

Question

我第一次尝试在 Spring MVC 中使用 validator ，但总是遇到异常:

javax.validation.UnexpectedTypeException: No validator could be found for type: java.lang.String
    at org.hibernate.validator.engine.ConstraintTree.verifyResolveWasUnique(ConstraintTree.java:236)
    at org.hibernate.validator.engine.ConstraintTree.findMatchingValidatorClass(ConstraintTree.java:219)
    at org.hibernate.validator.engine.ConstraintTree.getInitializedValidator(ConstraintTree.java:167)
    at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:113)
    at org.hibernate.validator.metadata.MetaConstraint.validateConstraint(MetaConstraint.java:121)
    at org.hibernate.validator.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:334)

这是我带注释的验证类:

public class AbstractEmployeDto implements Employable, Comparable<AbstractEmployeDto> {

private Set<AbstractClientDto> listeClients = new TreeSet<AbstractClientDto>();

private Long id;

@NotEmpty
private String nom;

@NotEmpty
private String prenom;

@DateTimeFormat(pattern="dd/MM/yyyy")
@Past
private String dateNaissance;

@Size(min=10)
private String telephone;

@Email
private String email;

private TypeEmploye typePersonne;

private String rue;

@Size(min=4, max=4)
private String npa;

getter and setter ...

以及带有注释@valid的 Controller :

@RequestMapping(value = "/saveNew", method = RequestMethod.POST)  
    public ModelAndView saveNewEmploye(@ModelAttribute("command") @Valid AbstractEmployeDto employe,   
       BindingResult result) { 
        Map<String, Object> model = new HashMap<String, Object>();
        if(result.hasErrors()){
            return new ModelAndView("/employes/add.html", model);  
        }
...

Answer 1

@Past 和 @DateTimeFormat 必须在 Date 或 Calendar 上使用 不是字符串。正如 bean 验证文档所说:

The annotated element must be a date in the past. Now is defined as the current time according to the virtual machine. The calendar used if the compared type is of type Calendar is the calendar based on the current timezone and the current locale.

Supported types are:
java.util.Date
java.util.Calendar
null elements are considered valid.

也许你需要使用这样的东西:

@DateTimeFormat(pattern="dd/MM/yyyy")
@Past
private Date dateNaissance