【发布时间】：2013-09-16 09:48:05
【问题描述】：
我正在使用 eclipse 链接（v2.5.1）动态 JAXB 将 XML 转换为 JSON，反之亦然，使用多个模式。在将 JSON 编组为 XML 时，我想验证 JSON（针对 XSD）并且 Dynamic Moxy 无法验证生成的 JSON 并导致类转换异常。
emp.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:emp="Employee:2:0" targetNamespace="Employee:2:0"
elementFormDefault="unqualified" attributeFormDefault="unqualified"
version="2.0">
<xsd:element name="searchManager" type="emp:SearchManager" />
<xsd:complexType name="SearchManager">
<xsd:sequence>
<xsd:element name="CompanyName" type="xsd:string" />
<xsd:element name="objects" type="emp:Employee" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Employee">
<xsd:complexContent>
<xsd:extension base="emp:Organization">
<xsd:sequence>
<xsd:element name="EmpId" type="xsd:string" minOccurs="0" />
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="Projects">
<xsd:complexContent>
<xsd:extension base="emp:Organization"/>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="Organization">
<xsd:annotation>
<xsd:documentation>Abstract base class </xsd:documentation>
</xsd:annotation>
</xsd:complexType>
</xsd:schema>
Manager.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="Manager:1:0" xmlns:emp="Employee:2:0"
xmlns:manager="Manager:1:0" xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="unqualified" attributeFormDefault="unqualified"
version="1.0">
<!-- schema imports -->
<xs:import namespace="Employee:2:0" schemaLocation="emp.xsd" />
<xs:complexType name="Manager">
<xs:annotation>
<xs:documentation>
Definition of class Employee
</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="emp:Employee">
<xs:sequence>
<xs:element name="teamSize" type="xsd:int" minOccurs="0" />
<xs:element name="project1" type="manager:Project1"
minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="Project1">
<xs:complexContent>
<xs:extension base="manager:Developement">
<xs:sequence>
<xs:element name="type" type="xsd:int" minOccurs="0" />
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="Developement">
<xs:annotation>
<xs:documentation>
Abstract base class for an Development
</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="emp:Projects"/>
</xs:complexContent>
</xs:complexType>
</xs:schema>
示例.xml
<emp:searchManager xmlns:emp="Employee:2:0"
xmlns:manager="Manager:1:0">
<CompanyName>Test</CompanyName>
<objects xmlns:ns2="Manager:1:0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="ns2:Manager">
<EmpId>123456</EmpId>
<teamSize>10</teamSize>
<project1>
<type>1</type>
</project1>
</objects>
</emp:searchManager>
要测试的驱动程序如下
public class XMLToJSON {
/**
* @param args
*/
public static void main(String[] args) {
FileInputStream xsdInputStream;
try {
xsdInputStream = new FileInputStream("Manager.xsd");
DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsdInputStream, new MyEntityResolver(), null, null);
FileInputStream xmlInputStream = new FileInputStream("sample.xml");
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
JAXBElement<DynamicEntity> manager = (JAXBElement) unmarshaller.unmarshal(xmlInputStream);
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
//input xml to print
marshaller.marshal(manager, System.out);
Map namespaces = new HashMap();
namespaces.put("http://www.w3.org/2001/XMLSchema-instance", "xsi");
namespaces.put("Employee:2:0", "ns1");
namespaces.put("Manager:1:0", "ns2");
// XML to JSON
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json");
marshaller.setProperty(MarshallerProperties.NAMESPACE_PREFIX_MAPPER, namespaces);
FileOutputStream jsonOutputStream = new FileOutputStream("sample.json");
marshaller.marshal(manager, jsonOutputStream);
marshaller.marshal(manager, System.out);
//JSON to XML
JAXBUnmarshaller jsonUnmarshaller = jaxbContext.createUnmarshaller();
jsonUnmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, "application/json");
jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER, namespaces);
jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_INCLUDE_ROOT, true);
jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_ATTRIBUTE_PREFIX, "@");
SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = sf.newSchema(new File("Manager.xsd"));
jsonUnmarshaller.setSchema(schema);
StreamSource json = new StreamSource("sample.json");
JAXBElement<DynamicEntity> myroot = (JAXBElement) jsonUnmarshaller.unmarshal(json);
Marshaller m = jaxbContext.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
m.marshal(myroot, System.out);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (JAXBException e) {
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
生成的示例 JSON
{
"ns1.searchManager" : {
"CompanyName" : "Test",
"objects" : [ {
"xsi.type" : "ns2.Manager",
"EmpId" : "123456",
"teamSize" : 10,
"project1" : [ {
"type" : 1
} ]
} ]
}
}
在解组时发现以下异常
Exception in thread "main" java.lang.ClassCastException: org.eclipse.persistence.internal.oxm.record.XMLReaderAdapter$ExtendedContentHandlerAdapter cannot be cast to org.eclipse.persistence.internal.oxm.record.UnmarshalRecord
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.isTextValue(JSONReader.java:454)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:350)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:244)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:430)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:299)
at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:166)
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:778)
at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:666)
at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:593)
at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:287)
at XMLToJSON.main(XMLToJSON.java:74)
编辑：更正了生成的示例 json
问题
目的是检查 JSON 是否符合 XML 模式。 Dynamic JAXB 在解组时是否支持 JSON 验证？这是 Dynamic JAXB Moxy 中的错误吗？
【问题讨论】：
标签： eclipselink moxy