java - 没有 URI javax.xml.bind.UnmarshalException : unexpected element (uri :"", 本地 :"SearchAndList")。预期元素是(无)

Question

我在解码数据时遇到问题。我收到以下错误:

ERROR FsceClient - Error in getDataInMatches : unexpected element (uri:"", local:"SearchAndList"). Expected elements are (none) requested params:+COUNTRY=US+YR=2016+DIV=Ford+WB=122.0 javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"SearchAndList"). Expected elements are (none) at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:726)

这是我的 xml 文件:

<SearchAndList>
    <fvd>
        +COUNTRY=US+YR=2016+DIV=Ford+WB=122.0
    </fvd>
    <sol>
    <rsi>
        <sType>Ss</sType>
        <mHave>true</mHave>
        <toAr>0</toAr>
        <toAr>0</toAr>
        <toAr>22</toAr>
    </rsi>
    <rsi>
        <sType>ssa</sType>
        <mHave>true</mHave>
        <toAr>77</toAr>
    </rsi>
    </sol>
    <sol>
        <rsi>
            <sType>sve</sType>
            <mHave>false</mHave>
            <toAr>0</toAr>
            <toAr>21</toAr>
        </rsi>
    </sol>
</SearchAndList>

Answer 1

当 XSD 模式不包含元素定义而只包含类定义(即复杂类型)时会遇到这种情况。

例如对于这个 XSD，

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="foo">
    <xs:sequence>
      <xs:element name="bar" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

创建的对象工厂是这样的:

@XmlRegistry
public class ObjectFactory {
   public ObjectFactory() {
   }
   public Foo createFoo() {
        return new Foo();
    }
}

但是对于这个 XSD:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="foo" type="foo" nillable="true"/>
  <xs:complexType name="foo">
    <xs:sequence>
      <xs:element name="bar" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

JAXB 创建的 ObjectFactory 类是:

@XmlRegistry
public class ObjectFactory {
    private final static QName _Foo_QNAME = new QName("", "foo");
    public ObjectFactory() {
    }
    public Foo createFoo() {
        return new Foo();
    }
    @XmlElementDecl(namespace = "", name = "foo")
    public JAXBElement<Foo> createFoo(Foo value) {
        return new JAXBElement<Foo>(_Foo_QNAME, Foo.class, null, value);
    }
}

您可以看到还添加了 JAXBElement 包装器创建方法。使用第二个 XSD，解码器知道在遇到名称为“foo”的标签时该怎么做。因此，如果您有 XSD，请添加“元素”定义以及复杂类型。

----- 编辑----示例解码器代码:

JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
Object result = ((JAXBElement<Object>) jaxbUnmarshaller.unmarshal(stream)).getValue();