使用Hibernate API进行Java字符串日期验证 [英] Java String Date Validation Using Hibernate API

问题描述

我正在尝试使用javax.validation&休眠验证.我需要检查给定的字符串日期应该是过去的，并且它应该是正确的yyyyMMdd格式，并具有所有限制，例如leap年，30th，31st天.

I am attempting to validate String Date using javax.validation & Hibernate validation. i need to check given String date should be past and it should be correct yyyyMMdd format with all constraints like leap year, 30th, 31st day.

 public class UserInformation {

        @NotNull 
        public String idNum = null;

        @NotNull
        //@Past
        @Pattern(regexp="\\d{4}(1[012]|0[1-9])(3[01]|[12]\\d|0[0-9])")
        public String dob= null;

    }

我尝试使用此代码，但无法正常工作.有什么解决办法.如果我们有自定义验证器，那么它是否在字段级别.请提供建议或代码段.

I tried with this code but not working. Is there any solution. if we have custom validator then is it in field level.Please give suggestion or code snippet.

推荐答案

选项1

将模式更改为此:

Option 1

Change your pattern to this:

Pattern(regexp = "([0-2][0-9]|3[0-1])\/(0[1-9]|1[0-2])\/[0-9]{4}")

但是请记住，这种验证不会检查2月是否少于28/29天以及其他日期限制.

But keep in mind that this kind of validation is not checking if February has less than 28/29 days, and other dates constraints.

创建自定义约束验证器

注释

@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = CheckDateValidator.class)
@Documented
public @interface CheckDateFormat {

    String message() default "{message.key}";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };

    String pattern();

}

Validator类

Validator class

有了Date对象，您可以进行任何其他想要的验证(例如过去的拒绝日期)

Having the Date object you can do any other validation you want (like refuse dates in the past)

public class CheckDateValidator implements ConstraintValidator<CheckDateFormat, String> {

    private String pattern;

    @Override
    public void initialize(CheckDateFormat constraintAnnotation) {
        this.pattern = constraintAnnotation.pattern();
    }

    @Override
    public boolean isValid(String object, ConstraintValidatorContext constraintContext) {
        if ( object == null ) {
            return true;
        }

        try {
            Date date = new SimpleDateFormat(pattern).parse(object);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}

使用

@CheckDateFormat(pattern = "ddMMyyyy")
private String value;

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