Java JAXB解组:对象列表
我有 对于的XML输入Java JAXB解组:对象列表,java,jaxb,unmarshalling,Java,Jaxb,Unmarshalling,我有 对于的XML输入 public class Xlink { private String href; private String value; @XmlAttribute(namespace = "http://www.w3.org/1999/xlink") public String getHref() { return href; } public void setHref(String href)
public class Xlink
{
private String href;
private String value;
@XmlAttribute(namespace = "http://www.w3.org/1999/xlink")
public String getHref()
{
return href;
}
public void setHref(String href)
{
this.href = href;
}
@XmlValue
public String getValue()
{
return value;
}
public void setValue(String value)
{
this.value = value;
}
}
Edit2:在对测试对象进行了一些解组和编组的实验之后,我发现我需要在内容的标题中定义xmlns名称空间,以便与xlink:href=
类似xmlns:xlink=”http://www.w3.org/1999/xlink"
问题在于,我从一个包装类中获取课程元素,该包装类由resteasy解析出来。因此,生成的类不会携带名称空间信息
我需要强迫JAXB理解xmlns:xlink=”http://www.w3.org/1999/xlink“
适用于课程元素,但在谷歌搜索了一个小时后,我不知所措
Edit3:我正在从你那里拿到我的东西
在对应的服务器上使用。这反过来又是
我的解组代码的相关部分包括:
<?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">
<code>SOME CODE</code>
<name>name</name>
<subcourses>
<course ns2:href="Some href">some value</course>
<course ns2:href="sdsdg">sdfhdfhdhdh</course>
</subcourses>
</ns3:content>
其中r
是一个javax.ws.rs.core.Response
。还有破译者
Feed f = r.readEntity(Feed.class);
out.addAll(unmarshaller.Unmarshal(f.getEntries(), clazz));
公共列表解组(列表条目、类类别)
{
List out=new ArrayList();
T例;
对于(条目e:条目)
{
尝试
{
JAXBContext context=JAXBContext.newInstance(clazz);
Unmarshaller unmarsh=context.createUnmarshaller();
实例=(T)unmarsh.unmarshal((节点)e.getContent());
因为这是我第一次使用这项技术,所以完全有可能这段代码是“wtf”。当您注释字段(实例变量)时,请确保将
@xmlacessortype(xmlacesstype.field)
放在您的类上
public List<T> Unmarshal(List<Entry> entries, Class clazz)
{
List<T> out = new ArrayList<T>();
T instance;
for (Entry e : entries)
{
try
{
JAXBContext context = JAXBContext.newInstance(clazz);
Unmarshaller unmarsh = context.createUnmarshaller();
instance = (T) unmarsh.unmarshal((Node) e.getContent());
有了我更新的课程
类、您的Xlink
类和一个正确的名称空间限定的XML文档,下面的演示代码对我来说非常适合
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;
}
更新#1 Edit2:在进行了一些解包和编组的实验之后 我发现需要在中定义xmlns命名空间的测试对象 要匹配xlink:href=like的内容的标题 xmlns:xlink=”http://www.w3.org/1999/xlink“问题是我是 从解析的包装类内部获取课程元素 因此,生成的类不会继承 名称空间信息 解决问题的最佳方法是提取要解除marhal的片段 input.xml 下面是一个示例XML文档,其中名称空间信息定义在要解组的片段上方
更新#3
下面是您的示例代码的简化版本,其中所有内容都有效。也许您的代码中有一些不同之处,它将帮助您找到
条目
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);
}
}
演示
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;
}
}
输出
一些价值
SDFHDHDH
你说的“拒绝解组”是什么意思?只是传递一个空列表?是的,每次0个项目。你能提供更多关于要解组的XML片段的来源的详细信息吗?尝试实现这一点时,出现了一个问题。我从响应中得到的是一个已经解析的XML节点的节点对象。我无法强制readEntity()它调用JAXB provider给我一个字符串对象。如果我试图将其强制转换为课程,它将抛出ElementsImpl无法强制转换为课程。我确信我在某个地方做错了什么,但不知道是什么。@Meltea-您可以解组节点
对象。不,添加@XmlAccessorType(XmlAccessType.FIELD)
只是给出了很多错误,比如类有两个同名的属性
,而没有它,代码可以正常工作,并且有很多列表
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);
}
}
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);
}
}
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);
}
}
}
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);
}
}
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;
}
}
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);
}
}