java 如何使用 MixedContent 数据处理 JAXB ComplexType？

How to deal with JAXB ComplexType with MixedContent data?

提问by Oscar Jara

I got this XML structure:

我得到了这个 XML 结构：

<Tax>
  <Money currency="USD">0.00</Money>
  <Description xml:lang="en">
     17.5% Non-Recoverable
    <ShortName>vatspecial</ShortName>
  </Description>
</Tax>

Notice that Descriptionnode has MixedContent(composed with text and XML)and this is the XSDpart regarding Descriptionnode:

请注意，Description节点具有MixedContent（由文本和 XML 组成），这是XSD有关Description节点的部分：

<xsd:complexType name="TaxDescriptionType">
  <xsd:sequence>
    <xsd:element name="ShortName" type="xsd:string" />
  </xsd:sequence>
  <xsd:attribute ref="xml:lang" />
</xsd:complexType>

Everything is ok at this point, XJCoutputs the generated classes like this one regarding TaxDescriptionType:

此时一切正常，XJC输出生成的类，如下所示TaxDescriptionType：

package org.com.project;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlSchemaType;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.adapters.CollapsedStringAdapter;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

/**
 * <p>Java class for TaxDescriptionType complex type.
 * 
 * <p>The following schema fragment specifies the expected content contained within this class.
 * 
 * <pre>
 * &lt;complexType name="TaxDescriptionType">
 *   &lt;complexContent>
 *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
 *       &lt;sequence>
 *         &lt;element name="ShortName" type="{http://www.w3.org/2001/XMLSchema}string"/>
 *       &lt;/sequence>
 *       &lt;attribute ref="{http://www.w3.org/XML/1998/namespace}lang"/>
 *     &lt;/restriction>
 *   &lt;/complexContent>
 * &lt;/complexType>
 * </pre>
 * 
 * 
 */
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "TaxDescriptionType", propOrder = {
    "shortName"
})
public class TaxDescriptionType {

    @XmlElement(name = "ShortName", required = true)
    protected String shortName;
    @XmlAttribute(name = "lang", namespace = "http://www.w3.org/XML/1998/namespace")
    @XmlJavaTypeAdapter(CollapsedStringAdapter.class)
    @XmlSchemaType(name = "NCName")
    protected String lang;

    /**
     * Gets the value of the shortName property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getShortName() {
        return shortName;
    }

    /**
     * Sets the value of the shortName property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setShortName(String value) {
        this.shortName = value;
    }

    /**
     * Gets the value of the lang property.
     * 
     * @return
     *     possible object is
     *     {@link String }
     *     
     */
    public String getLang() {
        return lang;
    }

    /**
     * Sets the value of the lang property.
     * 
     * @param value
     *     allowed object is
     *     {@link String }
     *     
     */
    public void setLang(String value) {
        this.lang = value;
    }

}

Then, with the above classI am able to work around with the elements like this:

然后，有了上面的内容，class我就可以处理这样的元素：

taxDescriptionType.setLang("en");
taxDescriptionType.setShortName("vatspecial");
/* missing value: 17.5% Non-Recoverable */

But the problem is that I can't found a way to getor setthe 17.5% Non-Recoverabletext of the MixedContent-ComplexTypefrom the above XMLexample.

但问题是，我不能找到一种方法，get或者set将17.5% Non-Recoverable文本MixedContent-ComplexType从上面的XML例子。

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This is what I tried and it's not working:

这是我尝试过的，但不起作用：

• Used mixed="true"attribute like this:

• 使用的mixed="true"属性是这样的：

<xsd:complexType name="TaxDescriptionType" mixed="true">

<xsd:complexType name="TaxDescriptionType" mixed="true">

(I think XJC is ignoring the last attribute)

（我认为 XJC 忽略了最后一个属性）

---

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Doing some research, I found this:

做了一些研究，我发现了这个：

JAXB XJC compiler disregarding mixed=true on XML Schema documents

JAXB XJC 编译器忽略 XML 模式文档上的混合=真

But I am not sure if this is the way to solve this. One of the answers said that this is a bug and in the other one shows a code that transforms the MixedContentinto a List<Serializable>and maybe the next situation will be about how to deal with this:

但我不确定这是否是解决这个问题的方法。一个答案说这是一个错误，而另一个答案显示了一个将 theMixedContent转换为 a的代码，List<Serializable>也许下一个情况将是如何处理这个问题：

taxDescriptionType.getContent().add(Serializable element);

(And I really don't know how to deal with a Serializableelement)

（而且我真的不知道如何处理一个Serializable元素）

采纳答案by bdoughan

As you mentioned you need to add the mixedattribute to indicate that your type supports mixed content. Without this specified your XML content is invalid:

正如您所提到的，您需要添加mixed属性来表明您的类型支持混合内容。如果没有指定，您的 XML 内容无效：

<xsd:complexType name="TaxDescriptionType" mixed="true">
    <xsd:sequence>
        <xsd:element name="ShortName" type="xsd:string" />
    </xsd:sequence>
    <xsd:attribute ref="xml:lang" />
</xsd:complexType>

The generated TaxDescriptionTypeclass will have the following property. Essentially this means that all of the non-attribute content will be stored in a List. This is necessary because you need a mechanism that indicates where the text nodes are wrt the element content.

生成的TaxDescriptionType类将具有以下属性。从本质上讲，这意味着所有非属性内容都将存储在List. 这是必要的，因为您需要一种机制来指示文本节点与元素内容的位置。

@XmlElementRef(name = "ShortName", namespace = "http://www.example.org/schema", type = JAXBElement.class)
@XmlMixed
protected List<Serializable> content;

You will populate this list with instances of String(representing text nodes) and JAXBElement(representing element content).

您将使用String（代表文本节点）和JAXBElement（代表元素内容）的实例填充此列表。

---

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ALTERNATIVELY

或者

Mixed content generally makes life more complicated than it needs to be. If possible I would recommend an alternate XML representation.

混合内容通常会使生活变得比实际需要的更复杂。如果可能，我会推荐一个替代的 XML 表示。

<Tax>
  <Money currency="USD">0.00</Money>
  <Description xml:lang="en" ShortName="vatspecial">
    17.5% Non-Recoverable
  </Description>
</Tax>

Or

或者

<Tax>
  <Money currency="USD">0.00</Money>
  <Description xml:lang="en">
    <LongName>17.5% Non-Recoverable</LongName>
    <ShortName>vatspecial</ShortName>
  </Description>
</Tax>

回答by x545

With mixed=true, in ObjectFactory there should be a function like JAXBElement<ShortNameType> createTaxDescriptionTypeShortNameType(ShortNameType), which generates the serializable element for you.

使用mixed=true，在ObjectFactory 中应该有一个类似的函数JAXBElement<ShortNameType> createTaxDescriptionTypeShortNameType(ShortNameType)，它为您生成可序列化的元素。

 @XmlElementDecl(namespace = "", name = "shortnametype", scope = TaxDescriptionType.class)
    public JAXBElement<ShortNameType> createTaxDescriptionTypeShortNameType(ShortNameType value) {
        return new JAXBElement<ShortNameType>(new QName("", "shortnametype"), ShortNameType.class, TaxDescriptionType.class, value);
 }