[英]JAX-WS request validation using JAXB
在JAX-WS中,要验证传入请求,其中一种方法是使用@SchemaValidation,如下面的链接所示。
但是,我使用的应用程序服务器(WAS 7)尚不支持@SchemaValidation。 (如果WAS 7确实支持此注释,请更正我)
所以我正在寻找其他选项,比如实现一个处理程序来验证传入的请求。 无论是在处理程序还是端点类本身,我都可以创建JAXBContext并使用JAXB验证器。 我是否需要显式创建JAXBContext,或者它是否可用作资源/注释,因为JAX-WS内部使用JAXB? 这是在JAX-WS中实现验证的好方法吗? (在没有@SchemaValidation验证的情况下)
在Web服务中验证传入的请求xml是否是一种标准做法,或者由于可能需要的性能影响,它是否被跳过?
像每个MVC系统一样,验证传入请求xml是一个好习惯。 (MVC可能不适合这里,但原则上,它只是视图是XML)。 如果不支持提到的注释( @SchemaValidation
),那么一个出路就是使用handler,它将使用JAXB Validation验证传入的请求。
如果您是一个大型组织,更好的做法是使用DataPower。 它将为您进行验证以及各种功能。 就最佳实践而言,我建议DataPower只是因为它是为此设计的,但您需要确保开发可以验证的代码,否则您会在运行时遇到验证问题。
我也不建议使用@SchemaValidation,因为这是特定于供应商而非标准。
话虽这么说,当我在我的参考Java EE应用程序中使用拦截器时,我写了以下内容,该应用程序不使用任何特定于供应商的API。
/**
* Validates the XML streams going in the request and response if the log level
* is {@link Level#FINER} or below against {@value #LOGGER_NAME}. If
* {@link Level#FINEST} is used it will also dump the XML that were sent.
*
* @author Archimedes Trajano
*
*/
public class XmlValidationInterceptor {
/**
* Logger.
*/
private static final Logger LOG;
/**
* Name of the logger.
*/
public static final String LOGGER_NAME = "xml.validation"; //$NON-NLS-1$
static {
LOG = Logger.getLogger(LOGGER_NAME, "Messages"); //$NON-NLS-1$
}
/**
* Contains a composite of multiple schema files into one schema that used
* on all message validations.
*/
private final Schema schema;
/**
* Loads up the schema into memory. This uses the default
*
* @throws SAXException
* problem parsing the schema files.
*/
public XmlValidationInterceptor() throws SAXException {
final SchemaFactory sf = SchemaFactory
.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schema = sf.newSchema();
}
/**
* Loads up the schema from the specified array of {@link Source} into
* memory.
*
* @param schemaSources
* schema sources.
* @throws SAXException
* problem parsing the schema files.
*/
public XmlValidationInterceptor(final Source... schemaSources)
throws SAXException {
final SchemaFactory sf = SchemaFactory
.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
schema = sf.newSchema(schemaSources);
}
/**
* Writes the object as XML to the logger.
*
* @param param
* object to marshal
* @param context
* invocation context used for logging.
* @throws JAXBException
* problem with the Java binding except schema issues because
* schema validation errors are caught and processed
* differently.
*/
private void marshalObject(final Object param,
final InvocationContext context) throws JAXBException {
if (!param.getClass().isAnnotationPresent(XmlRootElement.class)) {
return;
}
// validate against known schemas
final JAXBContext jaxbContext = JAXBContext.newInstance(param
.getClass());
final Marshaller m = jaxbContext.createMarshaller();
m.setSchema(schema);
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
try {
final StringWriter w = new StringWriter();
m.marshal(param, w);
LOG.finest(w.toString());
} catch (final MarshalException e) {
if (!(e.getLinkedException() instanceof SAXParseException)) {
throw e;
}
final SAXParseException parseException = (SAXParseException) e
.getLinkedException();
LOG.log(Level.SEVERE,
"XmlValidationInterceptor.parseException", // $NON-NLS-1$
new Object[] { context.getMethod(), param,
parseException.getMessage() });
m.setSchema(null);
final StringWriter w = new StringWriter();
m.marshal(param, w);
LOG.finest(w.toString());
}
}
/**
* Validates the data in the parameters and return values.
*
* @param context
* invocation context
* @return invocation return value
* @throws Exception
* invocation exception
*/
@AroundInvoke
public Object validate(final InvocationContext context) throws Exception {
if (!LOG.isLoggable(Level.FINER)) {
return context.proceed();
}
final Object[] params = context.getParameters();
for (final Object param : params) {
marshalObject(param, context);
}
final Object ret = context.proceed();
if (ret != null) {
marshalObject(ret, context);
}
return ret;
}
}
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