spring4 hibernate validation

从哪里加载的validator呢

默认就是用下面的这个validator

/**
 * {@link LocalValidatorFactoryBean} subclass that simply turns
 * {@link org.springframework.validation.Validator} calls into no-ops
 * in case of no Bean Validation provider being available.
 *
 * <p>This is the actual class used by Spring's MVC configuration namespace,
 * in case of the {@code javax.validation} API being present but no explicit
 * Validator having been configured.
 *
 * @author Juergen Hoeller
 * @since 4.0.1
 */
public class OptionalValidatorFactoryBean extends LocalValidatorFactoryBean {

	@Override
	public void afterPropertiesSet() {
		try {
			super.afterPropertiesSet();
		}
		catch (ValidationException ex) {
			LogFactory.getLog(getClass()).debug("Failed to set up a Bean Validation provider", ex);
		}
	}

}

是在WebMvcConfigurationSupport中决定的

引用

/**
* Return a global {@link Validator} instance for example for validating
* {@code @ModelAttribute} and {@code @RequestBody} method arguments.
* Delegates to {@link #getValidator()} first and if that returns {@code null}
* checks the classpath for the presence of a JSR-303 implementations
* before creating a {@code OptionalValidatorFactoryBean}.If a JSR-303
* implementation is not available, a no-op {@link Validator} is returned.
*/
@Bean
public Validator mvcValidator() {
Validator validator = getValidator();
if (validator == null) {
if (ClassUtils.isPresent("javax.validation.Validator", getClass().getClassLoader())) {
Class<?> clazz;
try {
String className = "org.springframework.validation.beanvalidation.OptionalValidatorFactoryBean";
clazz = ClassUtils.forName(className, WebMvcConfigurationSupport.class.getClassLoader());
}
catch (ClassNotFoundException ex) {
throw new BeanInitializationException("Could not find default validator class", ex);
}
catch (LinkageError ex) {
throw new BeanInitializationException("Could not load default validator class", ex);
}
validator = (Validator) BeanUtils.instantiate(clazz);
}
else {
validator = new NoOpValidator();
}
}
return validator;
}

这个地方开始进入验证
ModelAttributeMethodProcessor:
1.resolveArgument
{
这个地方有创建binder
WebDataBinder binder = binderFactory.createBinder(webRequest,   attribute, name);

}
this.initializer.initBinder(dataBinder, webRequest);
这句话最重要

/**
	 * Create a new {@link WebDataBinder} for the given target object and
	 * initialize it through a {@link WebBindingInitializer}.
	 * @throws Exception in case of invalid state or arguments
	 */
	@Override
	public final WebDataBinder createBinder(NativeWebRequest webRequest, Object target, String objectName)
			throws Exception {
		WebDataBinder dataBinder = createBinderInstance(target, objectName, webRequest);
		if (this.initializer != null) {
			this.initializer.initBinder(dataBinder, webRequest);
		}
		initBinder(dataBinder, webRequest);
		return dataBinder;
	}
这个地方有初始化
ConfigurableWebBindingInitializer：initBinder

2.validateIfApplicable

DataBinder: validate
DataBinder中含有
private final List<Validator> validators = new ArrayList<Validator>();
真实的验证发生在
SpringValidatorAdapter 中targetValidator的validate
他的实现可以是hibernate中的ValidatorImpl

	public Validator getValidator() {
		ResourceBundleLocator defaultResourceBundleLocator = new PlatformResourceBundleLocator(VALIDATION_FILE_NAME);
		MessageInterpolator defaultMessageInterpolator = new ResourceBundleMessageInterpolator(
				defaultResourceBundleLocator);
		LocalValidatorFactoryBean bean = new LocalValidatorFactoryBean();
		bean.setMessageInterpolator(defaultMessageInterpolator);
		bean.setProviderClass(HibernateValidator.class);
		// bean.setValidationMessageSource(messageSource());
		return bean;
	}

上面的可以使用hibernate默认的错误信息
同时包含自定义的错误信息
注意VALIDATION_FILE_NAME不能包含classpath
可以看可以有文件夹