场景

我在开发修改密码功能，通过原密码和新密码及确认新密码，希望通过ConstraintValidator这个方式来校验新密码和确认新密码，规则是这两个密码需要是相同的。

参考文档

• https://github.com/micronaut-projects/micronaut-core/issues/3243
• https://stackoverflow.com/questions/37750656/how-to-access-a-field-which-is-described-in-annotation-property
• https://discourse.hibernate.org/t/how-can-i-retrieve-current-validation-contexts-groups-in-a-validator/414/4

实现

定义Matches注解

<code>@Constraint(validatedBy = SameContentMatchesValidator.class)

@Target({ ElementType.FIELD })

@Retention(RetentionPolicy.RUNTIME)

public @interface SameContentMatches {

String message() default "内容不一致";

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

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

String field(); // 新增属性，指定要比较的字段

}

定义DTO对象

@Data

public class UserModifyPasswordDTO implements UserDTO {

@NotNull

private String userName;

@NotNull

private String password;

private String newPassword;

@SameContentMatches(field = "newPassword")

private String confirmPassword;

}

定义MatchesValidator对象，实现验证的代码逻辑

public class SameContentMatchesValidator implements ConstraintValidator<SameContentMatches, String> {

private String field;

@Override

public void initialize(SameContentMatches constraintAnnotation) {

this.field = constraintAnnotation.field();

}

@Override

public boolean isValid(String object, final ConstraintValidatorContext context) {

return true;

}

}

遇到的问题

• 在MatchesValidator类中，无法获取到当前对象，除非把SameContentMatches注解作用到当前类上面，而非字段上面。
• 这个问题应该主是无法解决的，因为你拦截的是字段，在这个ConstraintValidatorContext处理的都是和当前字段有关的信息

应用到类上，代码调整，问题解决

@Constraint(validatedBy = SameContentMatchesValidator.class)

@Target({ ElementType.TYPE })

@Retention(RetentionPolicy.RUNTIME)

public @interface SameContentMatches {

String message() default "内容不一致";

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

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

/**

* 源字段名

* @return

*/

String sourceField();

/**

* 目标字段名

* @return

*/

String destinationField();

}

public class SameContentMatchesValidator implements ConstraintValidator<SameContentMatches, Object> {

private String sourceField;

private String destinationField;

@Override

public void initialize(SameContentMatches constraintAnnotation) {

this.sourceField = constraintAnnotation.sourceField();

this.destinationField = constraintAnnotation.destinationField();

}

@Override

public boolean isValid(Object o, final ConstraintValidatorContext context) {

final Object sourceFieldVal = BeanUtil.getProperty(o, this.sourceField);

final Object destinationFieldVal = BeanUtil.getProperty(o, this.destinationField);

return sourceFieldVal.equals(destinationFieldVal);

}

}

@Data

@SameContentMatches(sourceField = "confirmPassword", destinationField = "newPassword")

public class UserModifyPasswordDTO implements UserDTO {

@NotNull

private String userName;

@NotNull

private String password;

private String newPassword;

private String confirmPassword;

}

上面的代码SameContentMatches注解出现了弱编码，这块需要再进行优化。