如何使用 JAXB 为 XML 中的空元素生成结束标记

Question

我正在使用 JAXB 生成 XML。但是 JAXB 正在生成一个空标签，将其自行关闭。但我的客户想要单独的空标签。我知道两者是平等的，但他不同意我的看法。请任何人提出解决方案。谢谢。

示例代码：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "currencyCode",
    "discountValue",
    "setPrice",
    "spendLowerThreshold",
    "spendUpperThreshold",
    "discountApportionmentPercent",
    "discountApportionmentValue"
})
@XmlRootElement(name = "countryData")
public class CountryData {
    protected String currencyCode;
    protected String discountValue = "";
    protected String setPrice = "";
    protected String spendLowerThreshold = "";
    protected String spendUpperThreshold = "";
    protected String discountApportionmentPercent = "";
    protected String discountApportionmentValue = "";

    // Setters and Gettres
}

实际输出：

<currencyCode>GBP</currencyCode>
<discountValue/>
<setPrice/>
<spendLowerThreshold/>
<spendUpperThreshold/>
<discountApportionmentPercent>0.0</discountApportionmentPercent>
<discountApportionmentValue/>

预期输出：

<currencyCode>GBP</currencyCode>
<discountValue></discountValue>
<setPrice></setPrice>
<spendLowerThreshold></spendLowerThreshold>
<spendUpperThreshold></spendUpperThreshold>
<discountApportionmentPercent>0.0</discountApportionmentPercent>
<discountApportionmentValue></discountApportionmentValue>

编组代码：

try {
    Marshaller marshaller = JAXBContext.newInstance(CountryData.class).createMarshaller();
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    marshaller.marshal(countryData , os);
    log.debug("The PPV request raw XML -> " + os.toString());
} catch (JAXBException e) {
    // nothing to do
}

我正在使用 JDK 6.0

Answer 1

如果你已经从XSD then you would also generated ObjectFactory class. If don't please refer here生成了类关于如何生成ObjectFactoryclass。

在那之后，你的代码就像--

JAXBContext context;
            context = JAXBContext.newInstance(*yourClass*.class);

final ObjectFactory objFactory = new ObjectFactory();

            final JAXBElement<YourClass> element = objFactory
                    .*autoGeneratedmethodfromObjectFactorytogetelement*;

Marshaller marshaller;
            marshaller = context.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
                    Boolean.TRUE);
            final StringWriter stringWriter = new StringWriter();


            marshaller.marshal(element, stringWriter);
          String message = stringWriter.toString();

这将为您提供所需的输出。

Answer 2

此行为取决于实现。我无意中遇到了相反的问题（我需要自闭标签），我在 this way.
You can try using this version of marshal() 中解决了问题或修改了链接答案中的代码。

Answer 3

问题已解决，要强制关闭标签，只需添加一个空字符串作为该标签的值！您可以使用 @XmlValue 来做到这一点：

public class closedTag {

    @XmlValue
    private String content;


    public closedTag() {
        this.content = "";
    }

}

如何使用 JAXB 为 XML 中的空元素生成结束标记

How to generate end tag for empty element in XML using JAXB

java

xml

jaxb

marshalling

java-6