如何将json解组为java.util.Map<；字符串，对象>；和莫西？

我知道也有类似的问题，比如和。我也经常阅读Blaise Doughan的博客，尤其是这篇文章：我尽可能地遵循他的建议，但是我仍然无法成功地解开json负载，我非常感谢您的帮助

要解组的json负载如下所示：

{
    "uri":"\\foo\\dosomthing",
    "action":"POST",
    "queryParameters":[
        "$filter=aaa",
        "$orderby=bbb"
    ],
    "requestData":{
        "data1":{
            "key1":"value1",
            "key2":"value2"
        },
        "ids":[
            "1234",
            "0294"
        ]
    }
}

我无法将“数据”解组到java.util.Map中。“数据”字段没有特定的模式，因此它可以包含数组、键值对或任何其他有效的json数据。我决定用地图把它包起来。根据我的研究，我认为我需要XmlAdapter来正确地转换数据

这是我的代码：

Java模式类：

然后，当测试应用程序运行时，会生成java.lang.ClassCastException异常：

FAILED: testUnmarshalFromJson
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.DocumentImpl cannot be cast to org.w3c.dom.Element
    at org.eclipse.persistence.internal.oxm.XMLCompositeObjectMappingNodeValue.endSelfNodeValue(XMLCompositeObjectMappingNodeValue.java:468)
    at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.endDocument(UnmarshalRecordImpl.java:606)
    at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.endElement(UnmarshalRecordImpl.java:1084)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:304)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:179)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:857)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:707)
    at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:655)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:301)
    at com.absolute.asb.urp.services.domain.TestStringObjectMapAdapter.testUnmarshalFromJson(TestStringObjectMapAdapter.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

---

也许您应该尝试创建正确的MoXY JAXBContext，如：

    private static synchronized JAXBContext createJAXBContext() throws JAXBException {
        if(jc == null){
            jc = org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(new Class[] {CustomerReqeust.class}, null);
        }
        return jc;
    }

或者使用中提到的另一种方式

---

顺便说一句，“CustomerReqeust”的拼写有点错误：-）

谢谢Sebastian，这些拼写错误已经纠正：）我尝试了你的建议，但得到了相同的例外。我认为JAXBContext是在我的代码中正确创建的。如果我删除了“映射”部分，它可以解组字符串键值对和列表。只有当我试图将json解组到映射值时，它才会抛出异常。在

解组过程中，我也遇到了类似的问题。我正在尝试将未知元素
解组为
映射
，但它没有按预期工作。我已经在下面提供的链接中发布了完整的问题。如果你有机会，请你看一看，并提供你的建议：好吧，我转投了杰克逊，效果非常好
@XmlJavaTypeAdapter
和
@xmlementwrapper
甚至不需要解组列表和映射。
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.stream.StreamSource;

import org.eclipse.persistence.jaxb.MarshallerProperties;
import org.testng.annotations.Test;

public class TestStringObjectMapAdapter {

    @Test
    public void testUnmarshalFromJson() throws Exception 
    {
        JAXBContext jc = JAXBContext.newInstance(CustomerRequest.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        unmarshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
        unmarshaller.setProperty(MarshallerProperties.JSON_INCLUDE_ROOT, false);
        StreamSource json = new StreamSource("test-data.json");
        CustomerRequest request= unmarshaller.unmarshal(json,   
            CustomerRequest.class).getValue();

        assert(request.getUri().equals("\\foo\\dosomthing"));
        assert(request.getAction().equals("POST"));
    }
}

FAILED: testUnmarshalFromJson
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.DocumentImpl cannot be cast to org.w3c.dom.Element
    at org.eclipse.persistence.internal.oxm.XMLCompositeObjectMappingNodeValue.endSelfNodeValue(XMLCompositeObjectMappingNodeValue.java:468)
    at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.endDocument(UnmarshalRecordImpl.java:606)
    at org.eclipse.persistence.internal.oxm.record.UnmarshalRecordImpl.endElement(UnmarshalRecordImpl.java:1084)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:304)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:179)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125)
    at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:857)
    at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:707)
    at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:655)
    at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:301)
    at com.absolute.asb.urp.services.domain.TestStringObjectMapAdapter.testUnmarshalFromJson(TestStringObjectMapAdapter.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)

    private static synchronized JAXBContext createJAXBContext() throws JAXBException {
        if(jc == null){
            jc = org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(new Class[] {CustomerReqeust.class}, null);
        }
        return jc;
    }