經過一堆挖掘和頭痛後,我最終開發了一個解決方案。
步驟1(可選)
編輯:您不必修補澤西實現這一行爲。我無法在任何地方找到它,但org.glassfish.jersey.internal.inject.Custom
註釋將提供商標記爲自定義(但僅有@Provider
不足)。如果您的供應商爲application/json
,您還必須將CommonProperties.MOXY_JSON_FEATURE_DISABLE
設置爲true來禁用MOXy。因此,你只需要做:
@Custom
@Provider
public class MyCustomMessageBodyReader...
[...]
這是我的解決方案我最不喜歡的部分,也救了我從一堆重複的代碼。澤西的選擇
MessageBodyReader/Writers
排序算法沒有辦法優先考慮應用程序提供者(我可以找到)。我想擴展
AbstractRootElementJaxbProvider
以重新使用它的功能,但這意味着我不能比澤西提供的
XmlRootElementJaxbProvider
更具體。由於默認情況下,Jersey僅對媒體類型距離,對象類型距離以及提供者是否註冊爲自定義提供者(通過
@Provider
註釋檢測到的提供者未註冊爲自定義提供者)進行排序,因此始終選擇Jersey實現,而不是我的
MessageBodyReader/Writer
。
我檢查了澤西島2.10。4源來自Github並且修補
MessageBodyFactory
以利用
@Priority
註釋作爲
MessageBodyReader/Writers
的選擇算法的一部分。
diff --git a/core-common/src/main/java/org/glassfish/jersey/message/internal/MessageBodyFactory.java b/core-common/src/main/java/org/glassfish/jersey/message/internal/MessageBodyFactory.java
index 3845b0c..110f18c 100644
--- a/core-common/src/main/java/org/glassfish/jersey/message/internal/MessageBodyFactory.java
+++ b/core-common/src/main/java/org/glassfish/jersey/message/internal/MessageBodyFactory.java
@@ -72,6 +72,7 @@ import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.ReaderInterceptor;
import javax.ws.rs.ext.WriterInterceptor;
+import javax.annotation.Priority;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.xml.transform.Source;
@@ -107,6 +108,8 @@ import jersey.repackaged.com.google.common.primitives.Primitives;
*/
public class MessageBodyFactory implements MessageBodyWorkers {
+ private static final int DEFAULT_WORKER_PRIORITY = 1000;
+
private static final Logger LOGGER = Logger.getLogger(MessageBodyFactory.class.getName());
/**
@@ -218,13 +221,15 @@ public class MessageBodyFactory implements MessageBodyWorkers {
public final T provider;
public final List<MediaType> types;
public final Boolean custom;
+ public final int priority;
public final Class<?> providerClassParam;
protected WorkerModel(
- final T provider, final List<MediaType> types, final Boolean custom, Class<T> providerType) {
+ final T provider, final List<MediaType> types, final Boolean custom, final int priority, Class<T> providerType) {
this.provider = provider;
this.types = types;
this.custom = custom;
+ this.priority = priority;
this.providerClassParam = getProviderClassParam(provider, providerType);
}
@@ -239,8 +244,8 @@ public class MessageBodyFactory implements MessageBodyWorkers {
private static class MbrModel extends WorkerModel<MessageBodyReader> {
- public MbrModel(MessageBodyReader provider, List<MediaType> types, Boolean custom) {
- super(provider, types, custom, MessageBodyReader.class);
+ public MbrModel(MessageBodyReader provider, List<MediaType> types, Boolean custom, int priority) {
+ super(provider, types, custom, priority, MessageBodyReader.class);
}
public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
@@ -263,8 +268,8 @@ public class MessageBodyFactory implements MessageBodyWorkers {
private static class MbwModel extends WorkerModel<MessageBodyWriter> {
- public MbwModel(MessageBodyWriter provider, List<MediaType> types, Boolean custom) {
- super(provider, types, custom, MessageBodyWriter.class);
+ public MbwModel(MessageBodyWriter provider, List<MediaType> types, Boolean custom, int priority) {
+ super(provider, types, custom, priority, MessageBodyWriter.class);
}
public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
@@ -437,6 +442,10 @@ public class MessageBodyFactory implements MessageBodyWorkers {
if (modelA.custom^modelB.custom) {
return (modelA.custom) ? -1 : 1;
}
+
+ if(modelA.priority != modelB.priority) {
+ return modelA.priority - modelB.priority;
+ }
return 0;
}
@@ -578,17 +587,27 @@ public class MessageBodyFactory implements MessageBodyWorkers {
}
}
+ private static int getPriority(Priority annotation) {
+ if (annotation == null) {
+ return DEFAULT_WORKER_PRIORITY;
+ }
+
+ return annotation.value();
+ }
+
private static void addReaders(List<MbrModel> models, Set<MessageBodyReader> readers, boolean custom) {
for (MessageBodyReader provider : readers) {
+ int priority = getPriority(provider.getClass().getAnnotation(Priority.class));
List<MediaType> values = MediaTypes.createFrom(provider.getClass().getAnnotation(Consumes.class));
- models.add(new MbrModel(provider, values, custom));
+ models.add(new MbrModel(provider, values, custom, priority));
}
}
private static void addWriters(List<MbwModel> models, Set<MessageBodyWriter> writers, boolean custom) {
for (MessageBodyWriter provider : writers) {
+ int priority = getPriority(provider.getClass().getAnnotation(Priority.class));
List<MediaType> values = MediaTypes.createFrom(provider.getClass().getAnnotation(Produces.class));
- models.add(new MbwModel(provider, values, custom));
+ models.add(new MbwModel(provider, values, custom, priority));
}
}
建設球衣後,我取代了Glassfish的球衣常見罐子modules目錄與我的補丁版本。這讓我用
@Priority(500)
註釋我的
MessageBodyReader/Writers
,並讓他們被澤西選中。
我覺得這是最簡潔的方法,讓我優先考慮我的
MessageBodyReader/Writers
而不會影響依賴於Jersey的Glassfish中的其他任何東西。
步驟2
通過this post的啓發,我決定,使用Unmarshaller.Listener
會比我原來的應用對每一個我的JAXB類的afterUnmarshal
的道路清潔。我做了一個界面(CanBeValidated
)和擴展Unmarshaller.Listener
如下。
public final class ValidatingUnmarshallerListener
extends Unmarshaller.Listener
{
private final ValidationEventHandler validationEventHandler;
public ValidatingUnmarshallerListener(
ValidationEventHandler validationEventHandler)
{
this.validationEventHandler = validationEventHandler;
}
@Override
public void afterUnmarshal(Object target, Object parent)
{
if (target == null
|| !(target instanceof CanBeValidated))
{
return;
}
CanBeValidated v = (CanBeValidated) target;
Collection<Throwable> validationErrors = v.validate();
for (Throwable t : validationErrors)
{
ValidationEvent event = new ValidationEventImpl(
ValidationEvent.ERROR,
t.getLocalizedMessage(),
null,
t);
this.validationEventHandler.handleEvent(event);
}
}
}
步驟3
最後,我擴展org.glassfish.jersey.message.internal.AbstractRootElementJaxbProvider
重寫readFrom
方法。
@Override
protected Object readFrom(
Class<Object> type,
MediaType mediaType,
Unmarshaller u,
InputStream entityStream)
throws JAXBException
{
final SAXSource source = getSAXSource(spf.provide(), entityStream);
ValidationEventCollector eventCollector = new ValidationEventCollector();
ValidatingUnmarshallerListener listener = new ValidatingUnmarshallerListener(eventCollector);
u.setEventHandler(eventCollector);
u.setListener(listener);
final Object result;
if (type.isAnnotationPresent(XmlRootElement.class))
{
result = u.unmarshal(source);
}
else
{
result = u.unmarshal(source, type).getValue();
}
if (eventCollector.hasEvents())
{
HttpError error = new HttpError(Response.Status.BAD_REQUEST);
for (ValidationEvent event : eventCollector.getEvents())
{
error.addMessage(ValidationUtil.toString(event));
}
throw new WebApplicationException(error.toResponse());
}
return result;
}
您能否顯示一下org.glassfish.jersey.message.internal.AbstractRootElementJaxbProvider的子類的完整代碼?我無法工作;我嘗試在我的構造函數中注入帶'@ Context'的'Providers',我必須把它傳遞給超類型構造函數,但我一直得到這個異常:'org.jboss.weld.exceptions.CreationException:WELD- 001530:無法生成類[...]的實例。' –
我遇到了同樣的問題。我通過懶惰地加載類來解決它。我寫了一個封裝器'公共抽象類LazyJaxbProvider implements MessageBodyReader ,MessageBodyWriter '並將提供者注入到封裝器@Context private Providers ps'中。然後我寫了一個方法'getMessageBodyReaderWriter',它返回'AbstractRootElementJaxbProvider'的子類的新實例,提供'this.ps'作爲構造函數參數。 –
根據你在做什麼,你可能也想看看[bean validation API](https://jersey.java.net/documentation/latest/bean-validation.html)。我還沒有嘗試過使用它,所以我甚至不確定與Glassfish 4.1一起打包的Jersey版本是否支持bean驗證。我覺得讓對象執行自己的驗證更有意義,而不必編寫一堆樣板定製註釋,無論如何都要與目標類緊密耦合。 –