如何使用 OData4J 从 OData 服务操作请求 JSON 数据？

发布于 2024-12-11 21:41:18 字数 1571 浏览 1 评论 0原文

我正在尝试使用 odata4j 库从 Java 查询 WCF OData 服务。如果我使用 ATOM 格式查询实体，一切正常。如果我切换到 JSON，Java 会抛出以下异常：

java.lang.RuntimeException: java.lang.RuntimeException: EdmEntitySet GetStatesViewData?gac=0 not found
    at org.core4j.ReadOnlyIterator.hasNext(ReadOnlyIterator.java:49)
    at org.core4j.Enumerable$FuncIterator.hasNext(Enumerable.java:487)
    at org.core4j.Enumerable$FuncIterator.hasNext(Enumerable.java:487)
    at ... Caused by: java.lang.RuntimeException: EdmEntitySet GetStatesViewData?gac=0 not found at org.odata4j.edm.EdmDataServices.getEdmEntitySet(EdmDataServices.java:40)
at org.odata4j.internal.EdmDataServicesDecorator.getEdmEntitySet(EdmDataServicesDecorator.java:31)
at org.odata4j.format.json.JsonFeedFormatParser.parse(JsonFeedFormatParser.java:99)
at org.odata4j.format.json.JsonFeedFormatParser.parse(JsonFeedFormatParser.java:21)
at org.odata4j.consumer.OQueryRequestImpl$EntryIterator.advance(OQueryRequestImpl.java:192)
at org.core4j.ReadOnlyIterator.hasNext(ReadOnlyIterator.java:47)
... 10 more

以下代码产生此异常：ODataConsumer odc =

ODataConsumer.create(FormatType.JSON, "http://localhost:6000/");
        Iterator<OEntity> iterator = odc.getEntities("GetStatesViewData?gac=0").execute();
for(OEntity entity: entities)
{
..
}

OData4j 无法找到实体“GetStatesViewData?gac=0”，但这样的属性不存在。存在的是接受参数“gac”的服务操作“GetStatesViewData”。是否可以使用 OData4j 调用带参数的服务操作？

如果我使用 Fiddler 或其他 Web 调试器，向此 OData 服务发送带有“accept: application/json”标头的 HTTP 请求，我通常会获得 JSON 提要。所以 OData4j 或我的代码中有问题，OData 服务器似乎没问题。

原文

I am trying to query a WCF OData service from Java using the odata4j library. If I query a entity using ATOM format, everything is OK. If I switch to JSON, Java throws following exception:

java.lang.RuntimeException: java.lang.RuntimeException: EdmEntitySet GetStatesViewData?gac=0 not found
    at org.core4j.ReadOnlyIterator.hasNext(ReadOnlyIterator.java:49)
    at org.core4j.Enumerable$FuncIterator.hasNext(Enumerable.java:487)
    at org.core4j.Enumerable$FuncIterator.hasNext(Enumerable.java:487)
    at ... Caused by: java.lang.RuntimeException: EdmEntitySet GetStatesViewData?gac=0 not found at org.odata4j.edm.EdmDataServices.getEdmEntitySet(EdmDataServices.java:40)
at org.odata4j.internal.EdmDataServicesDecorator.getEdmEntitySet(EdmDataServicesDecorator.java:31)
at org.odata4j.format.json.JsonFeedFormatParser.parse(JsonFeedFormatParser.java:99)
at org.odata4j.format.json.JsonFeedFormatParser.parse(JsonFeedFormatParser.java:21)
at org.odata4j.consumer.OQueryRequestImpl$EntryIterator.advance(OQueryRequestImpl.java:192)
at org.core4j.ReadOnlyIterator.hasNext(ReadOnlyIterator.java:47)
... 10 more

The following code produced this exception:ODataConsumer odc =

ODataConsumer.create(FormatType.JSON, "http://localhost:6000/");
        Iterator<OEntity> iterator = odc.getEntities("GetStatesViewData?gac=0").execute();
for(OEntity entity: entities)
{
..
}

OData4j is not able to find an entity "GetStatesViewData?gac=0", but such a property does not exist. What exists is a service operation "GetStatesViewData" which accepts a parameter "gac". Is it possible to call a service operation with parameters using OData4j?

If I use Fiddler or some other web debugger, send a HTTP request with a "accept: application/json" header to this OData Service, I normally get the JSON feed. So there is something wrong either in OData4j or in my code, the OData server seems to be OK.

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