Spring ConstraintValidator中的注入服务[Bean Validator-JSR 303] Spring [英] Inject Service in ConstraintValidator [Bean Validator - JSR 303] Spring
问题描述
下午好,
我在将服务插入Bean验证程序(JSR 303)时遇到问题.我将执行验证,但是我需要验证数据库中的该记录;
I am having problem to inject a service within a Bean Validator (JSR 303). I would be performing a validation, but I need to validate this record in my database;
当我使用我的服务时,它会抛出NullPointerException;
When I use my service it throws NullPointerException;
例外:
Exception in thread "main" javax.validation.ValidationException: HV000028: Unexpected exception during isValid call.
at org.hibernate.validator.internal.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:294)
at org.hibernate.validator.internal.engine.ConstraintTree.validateConstraints(ConstraintTree.java:164)
at org.hibernate.validator.internal.engine.ConstraintTree.validateConstraints(ConstraintTree.java:125)
at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:86)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:442)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:387)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:351)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:303)
at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:133)
at net.pontoall.hemisphere.core.validation.impl.TesteValidator.main(TesteValidator.java:25)
Caused by: java.lang.NullPointerException
at net.pontoall.hemisphere.core.validation.impl.UsuarioValidatorImpl.doCheckLogin(UsuarioValidatorImpl.java:48)
at net.pontoall.hemisphere.core.validation.impl.UsuarioValidatorImpl.isValid(UsuarioValidatorImpl.java:26)
at net.pontoall.hemisphere.core.validation.impl.UsuarioValidatorImpl.isValid(UsuarioValidatorImpl.java:1)
at org.hibernate.validator.internal.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:291)
... 9 more
注释:
@Target(value = ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = UsuarioValidatorImpl.class)
public @interface UsuarioValidator {
String message() default "{net.pontoall.hemisphere.validation.UsuarioValidator.message}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
ValidatorImpl:
ValidatorImpl:
public class UsuarioValidatorImpl implements ConstraintValidator<UsuarioValidator, Usuario> {
@Autowired
private IUsuarioService service;
@Override
public void initialize(UsuarioValidator arg0) {
}
@Override
public boolean isValid(Usuario entidade, ConstraintValidatorContext ctx) {
try {
return (this.doCheckLogin(entidade, ctx) && this.doCheckEmail(entidade, ctx));
} catch (HemisphereException e) {
e.printStackTrace();
return false;
}
}
private boolean doCheckLogin(Usuario entidade, ConstraintValidatorContext ctx) throws HemisphereException {
ctx.buildConstraintViolationWithTemplate("{net.pontoall.hemisphere.validation.UsuarioValidator.login.message}").addConstraintViolation();
if (entidade.getId() == null) {
// Novo Usuário
Usuario original = service.buscarPorLogin(entidade.getLogin());
if (original == null) {
return true;
}
return false;
} else {
Usuario original = service.obter(entidade.getId());
if (original == null) {
return true;
} else {
if (original.getLogin().equals(entidade.getLogin()) && original.getId().equals(entidade.getId())) {
return true;
}
}
return false;
}
}
private boolean doCheckEmail(Usuario entidade, ConstraintValidatorContext ctx) {
ctx.buildConstraintViolationWithTemplate("{net.pontoall.hemisphere.validation.UsuarioValidator.email.message}").addConstraintViolation();
if (entidade.getId() == null) {
// Novo Usuário
Usuario original = service.buscarPorEmail(entidade.getEmail());
if (original == null) {
return true;
}
return false;
} else {
Usuario original = service.obter(entidade.getId());
if (original == null) {
return true;
} else {
if (original.getEmail().equals(entidade.getEmail()) && original.getId().equals(entidade.getId())) {
return true;
}
}
return false;
}
}
}
推荐答案
You should set up a LocalValidatorFactoryBean in your Spring application context so you can retrieve Validator
(and ValidatorFactory
) instances via dependency injection.
默认情况下,像Pangea所指出的那样,使用SpringConstraintValidatorFactory
这样获得的验证器将为约束验证器实现提供依赖注入服务.
By default, a validator obtained like that makes use of SpringConstraintValidatorFactory
which provides dependency injection services to constraint validator implementations, as pointed out by Pangea.
这篇关于Spring ConstraintValidator中的注入服务[Bean Validator-JSR 303] Spring的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!