java - 解码 xml 时出现 UnmarshalException

Question

异常javax.xml.bind.UnmarshalException:意外元素(uri:“http://services.forddirect.fordvehicles.com/searchTest”，本地:“ClassName”)。预期元素为(无)

我正在粘贴用于解码 xml 的代码部分

try {

        File file = new File("ReflectionInput.xml");
        JAXBContext jaxbContext = JAXBContext.newInstance(SearchTest.class);
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        SearchTest className = (SearchTest) jaxbUnmarshaller
                .unmarshal(file);
        System.out.println(className);

    } catch(JAXBException e) {
        e.printStackTrace();
    }

}

从 xml 解码时出现异常。

Exception javax.xml.bind.UnmarshalException: unexpected element (uri:"http://services.forddirect.fordvehicles.com/searchTest", local:"ClassName"). Expected elements are (none)
 at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:647)
 at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:258)
 at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportError(Loader.java:253)
 at com.sun.xml.bind.v2.runtime.unmarshaller.Loader.reportUnexpectedChildElement(Loader.java:120)
 at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext$DefaultRootLoader.childElement(UnmarshallingContext.java:1052)
 at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:483)
 at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:464)
 at com.sun.xml.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:152)
 at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)

xsd 文件

<?xml version="1.0" encoding="utf-8"?>
 <xs:schema xmlns="http://services.forddirect.fordvehicles.com/searchTest"
  attributeFormDefault="unqualified" elementFormDefault="qualified"
  targetNamespace="http://services.forddirect.fordvehicles.com/searchTest"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xs:element name="SearchTest" type="searchTest">
  </xs:element>
  <xs:complexType name="searchTest">
   <xs:sequence>
    <xs:element name="ClassName" type="className" minOccurs="0"
     maxOccurs="unbounded" />
   </xs:sequence>
  </xs:complexType>

  <xs:complexType name="className">
   <xs:sequence>
    <xs:element name="param" type="xs:string" minOccurs="0"
     maxOccurs="unbounded" />
   </xs:sequence>
  </xs:complexType> 
 </xs:schema>

xml 文件

     <?xml version="1.0" encoding="UTF-8"?>
     <ClassName xmlns="http://services.forddirect.fordvehicles.com/searchTest">
     <param name ="make">Ford</param>
       <param name ="model">Mustang</param>
       <param name ="year">2011</param>
       <param name ="dealerPACode">2011</param>
       <param name ="segment">car</param>
       <param name ="segmentdefiner">NGP_ModelInfo_VehicleType</param>
       <param name           ="configtoken">Config[|Ford|Mustang|2014|1|1.|100A.P8A.....COU.~YZKAA.V6.LESS.]</param>
  <param name ="vin">3FA6P0H79DR338449</param>
     </ClassName>

Answer 1

问题是什么:

由于 SearchTest 是具有命名复杂类型的全局元素，因此不会为 SearchTest 类生成 @XmlRootElement 注释。相反，在 ObjectFactory 类上为其生成一个 @XmlElementDecl 注释。这是因为在 JAXB 中，类对应于复杂类型，并且命名的复杂类型可能有多个与其对应的全局元素。

  <xs:element name="SearchTest" type="searchTest">
  </xs:element>
  <xs:complexType name="searchTest">
   <xs:sequence>
    <xs:element name="ClassName" type="className" minOccurs="0"
     maxOccurs="unbounded" />
   </xs:sequence>
  </xs:complexType>

如何修复它:

在从 XML 模式生成的模型上创建 JAXBContext 时，应在 ObjectFactory 类或生成模型的包名称上创建它，而不是在单独的模型上创建它模型类来获取所有必要的元数据。

JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);

了解更多信息

• http://blog.bdoughan.com/2012/07/jaxb-and-root-elements.html