JAXB Fragment Marshal没有命名空间-Java 学习之路

我正在使用我的marshaller的JAXB_FRAGMENT属性来编组WorkSet级别 . 问题在于，当我封送它时，每次都为WorkSet元素提供xmlns属性 . 有没有办法编组，以便它不附加xmlns属性？这是我的XML的样子 .

<Import>
        <WorkSets>
            <WorkSet xmlns="http://www.namespace.com">
                <Work>
                <Work>
                ...
                ..
                ...
            </WorkSet>
            <WorkSet xmlns="http://www.namespace.com">
                <Work>
                <Work>
                ...
            </WorkSet>
        </WorkSets>
    </Import>

这是我正在使用上面创建的代码：

FileOutputStream fos = new FileOutputStream("import.xml");
XMLStreamWriter writer = XMLOutputFactory.newFactory().createXMLStreamWriter(fos);

JAXBContext jc = JAXBContext.newInstance(WorkSet.class);
Marshaller m = jc.createMarshaler();
m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);

writer.writeStartDocument();
writer.writeStartElement("Import");
writer.writeAttribute("xmlns","http://www.namespace.com");
writer.writeStartElement("WorkSets");

while(hasWorkSet){
m.marshal(workSet, writer)
}
writer.writeEndDocument();
writer.close();

3 回答

假设您希望文档的默认命名空间为 http://www.namespace.com ，则可以执行以下操作：

Demo

XMLStreamWriter.setDefaultNamespace(String) 和 XMLStreamWriter.writeNamespace(String, String) 方法将用于设置和写入XML文档的默认命名空间 .

package forum9297872;

import javax.xml.bind.*;
import javax.xml.stream.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        XMLStreamWriter writer = XMLOutputFactory.newFactory().createXMLStreamWriter(System.out);
        writer.setDefaultNamespace("http://www.namespace.com");

        JAXBContext jc = JAXBContext.newInstance(WorkSet.class);
        Marshaller m = jc.createMarshaller();
        m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);

        writer.writeStartDocument();
        writer.writeStartElement("http://www.namespace.com", "Import");
        writer.writeNamespace("", "http://www.namespace.com");
        writer.writeStartElement("WorkSets");

        m.marshal(new WorkSet(), writer);
        m.marshal(new WorkSet(), writer);

        writer.writeEndDocument();
        writer.close();
    }

}

WorkSet

我的假设是您在JAXB模型中指定了名称空间信息 .

package forum9297872;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="WorkSet", namespace="http://www.namespace.com")
public class WorkSet {

}

Output

以下是运行演示代码的输出：

<?xml version="1.0" ?><Import xmlns="http://www.namespace.com"><WorkSets><WorkSet></WorkSet><WorkSet></WorkSet></WorkSets></Import>

回复于 2024-05-15T23:23:10+08:00

1
有三种解决方法 .

1）为workerets的容器创建JAXB注释对象 . 将workersets添加到该对象，然后整理整个对象 .

2）按照101 ways to marshal objects with JAXB中的第一个示例，使用 DocumentBuilderFactory 并识别名称空间 .

3）假设jaxb对象位于一个永远不具有限定名称空间的包中，您可以将以下内容添加到包注释中:(注意：自从我完成此操作已经有一段时间了，我没有测试过这段代码）
```
@XmlSchema(namespace = "", elementFormDefault = XmlNsForm.UNQUALIFIED) 
package example;
```
回复于 2024-05-15T23:23:10+08:00

再举一个例子：

try {
        JAXBContext customerInformationRequestContext = JAXBContext.newInstance(CustomerInformationRequest.class);
        Unmarshaller unmarshaller = customerInformationRequestContext.createUnmarshaller();
        StringReader stringReader = new StringReader(requestPayload);
        XMLInputFactory xif = XMLInputFactory.newFactory();
        XMLStreamReader xsr = xif.createXMLStreamReader(stringReader);
        XMLStreamReaderWrapper reader = new XMLStreamReaderWrapper(xsr);
        CustomerInformationRequest customerInformationRequest = (CustomerInformationRequest) unmarshaller.unmarshal(reader);
        CustomerInformationResponse customerInformationResponse = customerLookup(customerInformationRequest, sessionTransaction);
        JAXBContext customerInformationResponseContext = JAXBContext.newInstance(CustomerInformationResponse.class);
        Marshaller marshaller = customerInformationResponseContext.createMarshaller();
        StringWriter stringWriter = new StringWriter();
        XMLOutputFactory xof = XMLOutputFactory.newFactory();
        XMLStreamWriter xsw = xof.createXMLStreamWriter(stringWriter);
        xsw = new XMLStreamWriterWrapper(xsw);
        marshaller.marshal(customerInformationResponse, xsw);
        String responsePayload = stringWriter.toString();
        return responsePayload;
    } catch (Exception e) {
        log.debug("The payload could not be unmarshalled.", e);
        return null;
    }

回复于 2024-05-15T23:23:10+08:00

JAXB Fragment Marshal没有命名空间

3 回答

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