如何使用Hibernate Validator动态解析消息参数？

我正在使用Hibernate Validator，并希望在错误消息中解析类别的名称。 考虑这个简单的场景：

public class Category { private String name; } public class Product { @HazardousCategoryConstraint(message = "{haz.cat.error}") private Category category; private String name; } public class InventoryReport { @Valid private List products; } ValidationMessages.properties haz.cat.error={name} is a product in the hazardous category list. 

假设我有一个HazardousCategoryConstraint的工作实现。 validation器根据受限制的名称列表检查每个类别的名称。 当我调用validate（InventoryReport）时，我得到了我期望的错误数，除非它们是相同的字符串。 我想看到分类的名称已解析为每条消息。 有人能指出我如何动态解决参数，或告诉我如何？

Answer 1

IMO，简单的解决方案是创建javax.validation.MessageInterpolator自定义实现。 将主要工作委托给Hibernate Validator的ResourceBundleMessageInterpolator ，并在CustomMessageInterpolator执行所需的替换工作。

 public class CustomMessageInterpolator extends org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator { private static final Pattern MESSAGE_PARAMETER_PATTERN = Pattern.compile( "(\\{[^\\}]+?\\})" ); @Override public String interpolate(String message, Context context) { String resolvedMessage = super.interpolate(message, context); resolvedMessage = replacePropertyNameWithPropertyValues(resolvedMessage, context.getValidatedValue()); return resolvedMessage; } private String replacePropertyNameWithPropertyValues(String resolvedMessage, Object validatedValue) { Matcher matcher = MESSAGE_PARAMETER_PATTERN.matcher( resolvedMessage ); StringBuffer sb = new StringBuffer(); while ( matcher.find() ) { String parameter = matcher.group( 1 ); String propertyName = parameter.replace("{", ""); propertyName = propertyName.replace("}", ""); PropertyDescriptor desc = null; try { desc = new PropertyDescriptor(propertyName, validatedValue.getClass()); } catch (IntrospectionException ignore) { matcher.appendReplacement( sb, parameter ); continue; } try { Object propertyValue = desc.getReadMethod().invoke(validatedValue); matcher.appendReplacement( sb, propertyValue.toString() ); } catch (Exception ignore) { matcher.appendReplacement( sb, parameter ); } } matcher.appendTail( sb ); return sb.toString(); } } 

@测试

 public void validate() { Configuration configuration = Validation.byDefaultProvider().configure(); ValidatorFactory validatorFactory = configuration.messageInterpolator(new CustomMessageInterpolator()).buildValidatorFactory(); Validator validator = validatorFactory.getValidator(); Product p = new Product(); Category cat = new Category(); cat.setName("s"); //assume specified name is invalid p.setCategory(cat); Set> violations = validator.validate(p); for(ConstraintViolation violation : violations) { System.out.println(violation.getMessage()); } } 

产量

 s is a product in the hazardous category list.