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
@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 {@NotNullprivate String userName;@NotNullprivate 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;@Overridepublic void initialize(SameContentMatches constraintAnnotation) {this.field = constraintAnnotation.field();}@Overridepublic 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;@Overridepublic void initialize(SameContentMatches constraintAnnotation) {this.sourceField = constraintAnnotation.sourceField();this.destinationField = constraintAnnotation.destinationField();}@Overridepublic 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 {@NotNullprivate String userName;@NotNullprivate 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。
