当你注释字段(实例变量)时,一定要把@XmlAccessorType(XmlAccessType.FIELD)
放在你的类上。
import java.util.List;
import javax.xml.bind.annotation.*;
@XmlRootElement(namespace = "http://www.w3.org/2005/Atom", name = "content")
@XmlAccessorType(XmlAccessType.FIELD)
public class Course implements Resource {
@XmlElementWrapper(name = "subcourses")
@XmlElement(name = "course")
List<Xlink> subcourses;
}
然后确保您的XML输入正确命名空间限定。你输入的文件看起来应该像下面这样:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<atom:content xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:atom="http://www.w3.org/2005/Atom">
<code>SOME CODE</code>
<name>name</name>
<subcourses>
<course xlink:href="Some href">some value</course>
<course xlink:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</atom:content>
随着我的更新Course
类,你Xlink
类和下面的演示代码工作完美的我一个正确的名称空间限定的XML文档。
import java.io.File;
import javax.xml.bind.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Course.class);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum17766166/input.xml");
Course course = (Course) unmarshaller.unmarshal(xml);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(course, System.out);
}
}
更新#1
EDIT2:经过一些实验用解组和编组一个 测试对象我发现我需要 的标题中定义的xmlns命名空间内容匹配xlink:href =类似 xmlns:xlink =“http://www.w3.org/1999/xlink”问题是我 从包装器c中获取Course元素这是通过resteasy解析 。因此,所得到的类不包含 名称空间信息。
解决问题的最佳场所就是提取您希望展现的片段。以下是您可以与StAX一起使用的策略。
input.xml中
下面是其中的名称空间信息是要解组片段如上定义的示例XML文档。
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<foo xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:atom="http://www.w3.org/2005/Atom">
<bar>
<atom:content>
<code>SOME CODE</code>
<name>name</name>
<subcourses>
<course xlink:href="Some href">some value</course>
<course xlink:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</atom:content>
</bar>
</foo>
演示
下面我们将用一个StAX的XMLStreamReader
导航与靶标片段。我们将让我们的JAXB实现解组这个片段。这样所有的名字空间信息都被保留下来。
import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.transform.stream.StreamSource;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Course.class);
XMLInputFactory xif = XMLInputFactory.newFactory();
StreamSource source = new StreamSource("src/forum17766166/input.xml");
XMLStreamReader xsr = xif.createXMLStreamReader(source);
while(xsr.hasNext()) {
if(xsr.isStartElement() && "content".equals(xsr.getLocalName())) {
break;
}
xsr.next();
}
Unmarshaller unmarshaller = jc.createUnmarshaller();
Course course = (Course) unmarshaller.unmarshal(xsr);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(course, System.out);
}
}
输出
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns3:content xmlns:ns2="http://www.w3.org/1999/xlink" xmlns:ns3="http://www.w3.org/2005/Atom">
<subcourses>
<course ns2:href="Some href">some value</course>
<course ns2:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</ns3:content>
更新#2
如果如在更新#1中所描述你不能产生更好的XML片段,下面是你如何修复你当前拥有的XML片段。
NamespaceFilter
你可以使用SAX XMLFilter
来修复您的XML文档。
import org.xml.sax.*;
import org.xml.sax.helpers.*;
public class NamespaceFilter extends XMLFilterImpl {
private static final String ATOM_URI = "http://www.w3.org/2005/Atom";
private static final String XLINK_URI = "http://www.w3.org/1999/xlink";
@Override
public void startElement(String uri, String localName, String qName,
Attributes atts) throws SAXException {
if("atom:content".equals(qName)) {
super.startElement(ATOM_URI, "content", qName, atts);
} else if("course".equals(qName)) {
AttributesImpl modifiedAtts = new AttributesImpl();
modifiedAtts.addAttribute(XLINK_URI, "href", "xlink:href", null, atts.getValue(0));
super.startElement(uri, localName, qName, modifiedAtts);
} else {
super.startElement(uri, localName, qName, atts);
}
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if("atom:content".equals(qName)) {
super.endElement(ATOM_URI, "content", qName);
} else {
super.endElement(uri, localName, qName);
}
}
}
演示
下面是如何利用的XmlFilter
与JAXB:
import javax.xml.bind.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Course.class);
// Create the XMLFilter
XMLFilter filter = new NamespaceFilter();
// Set the parent XMLReader on the XMLFilter
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
filter.setParent(xr);
// Set UnmarshallerHandler as ContentHandler on XMLFilter
Unmarshaller unmarshaller = jc.createUnmarshaller();
UnmarshallerHandler unmarshallerHandler = unmarshaller
.getUnmarshallerHandler();
filter.setContentHandler(unmarshallerHandler);
// Parse the XML
InputSource xml = new InputSource("src/forum17766166/input.xml");
filter.parse(xml);
Course course = (Course) unmarshallerHandler.getResult();
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(course, System.out);
}
}
更多信息
更新#3
下面是你的示例代码,一切工作的简化版本。也许你的代码有一些不同,它会帮助你找到。
进入
import javax.xml.bind.annotation.*;
@XmlRootElement(namespace="http://www.w3.org/2005/Atom")
@XmlAccessorType(XmlAccessType.FIELD)
public class Entry<T> {
@XmlElement(namespace = "http://www.w3.org/2005/Atom")
@XmlSchemaType(name = "atomInlineOtherContent")
private T content;
public T getContent() {
return content;
}
}
的input.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<atom:entry xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:atom="http://www.w3.org/2005/Atom">
<atom:content>
<code>SOME CODE</code>
<name>name</name>
<subcourses>
<course xlink:href="Some href">some value</course>
<course xlink:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</atom:content>
</atom:entry>
演示
import java.io.File;
import javax.xml.bind.*;
import org.w3c.dom.Node;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(Entry.class, Course.class);
// Unmarshal Entry
Unmarshaller unmarshaller = jc.createUnmarshaller();
File xml = new File("src/forum17766166/input.xml");
Entry entry = (Entry) unmarshaller.unmarshal(xml);
// Unmarshal Course
Node contentNode = (Node) entry.getContent();
Course course = (Course) unmarshaller.unmarshal(contentNode);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(course, System.out);
}
}
输出
<?xml version="1.0" encoding="UTF-8"?>
<ns0:content xmlns:ns1="http://www.w3.org/1999/xlink" xmlns:ns0="http://www.w3.org/2005/Atom">
<subcourses>
<course ns1:href="Some href">some value</course>
<course ns1:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</ns0:content>
你是什么意思'拒绝被取消编组'?只是提供一个空的列表? – bmargulies
是的,每次0项。 – Meltea
你能提供更多关于你解开XML片段的地方的细节吗? –