JAXB编组XMPP节 [英] JAXB marshalling XMPP stanzas
问题描述
我正在尝试使用以下代码段对邮件进行编组:
I am trying to marshall a message using the following snippet:
JAXBContext jContext = JAXBContext.newInstance(Iq.class);
Marshaller m = newJAXBContext.createMarshaller();
m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
Bind bind = new Bind();
bind.setResource("resource");
Iq iq = new Iq();
iq.setId(iqId);
iq.setType("set");
iq.getAnies().add(bind);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
m.marshal(iq, baos);
这里,Iq和Bind是由相关xmpp模式组成的对象。我的问题是,使用jaxb 2.0及更高版本,所有命名空间都在根元素中声明:
Here, Iq and Bind are the objects formed from the relevant xmpp schemas. My problem is, with jaxb 2.0 and later versions, all the namespaces are declared in the root element:
<iq from='juliet@example.com/balcony'
id='rg1'
type='get' xmlns='jabber:client' xmlns:ns1='urn:ietf:params:xml:ns:xmpp-bind'>
<ns1:bind>
<ns1:resource>resource</ns1:resource>
</ns1:bind>
</iq>
但是,这里需要的是命名空间应占据适当的位置:
But, what is needed here is that the namespaces should occupy the appropriate places:
<iq from='juliet@example.com/balcony'
id="rg1"
type="get" xmlns="jabber:client">
<bind xmlns="urn:ietf:params:xml:ns:xmpp-bind">
<resource>resource</resource>
</bind>
</iq>
有没有办法编组xmpp节,就像你在第二个xml节中通过JAXB 2.0看到它们一样或更高版本?
Is there a way to marshall the xmpp stanzas as you see them in the 2nd xml stanza through JAXB 2.0 or later versions?
长话短说,我在这里有2个问题:
1.在适当的位置声明命名空间。
2.删除我理解的命名空间前缀可以使用NamespacePrefixMapper删除吗?但不确定,一个例子会很棒。
Long story short, I have 2 problems here: 1. Declaring the namespaces at appropriate locations. 2. removing the namespace prefix which I understand can be removed using the NamespacePrefixMapper? Not sure though, an example would be great.
推荐答案
以下情况如何?:
创建一个自定义XMLStreamWriter,它将所有命名空间声明视为默认命名空间,然后编组为:
Create a custom XMLStreamWriter that will treat all namespace declarations as default namespaces, and then marshal to that:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
XMLOutputFactory xof = XMLOutputFactory.newFactory();
XMLStreamWriter xsw = xof.createXMLStreamWriter(System.out);
xsw = new MyXMLStreamWriter(xsw);
m.marshal(iq, xsw);
xsw.close();
MyXMLStreamWriter
import java.util.Iterator;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
public class MyXMLStreamWriter implements XMLStreamWriter {
private XMLStreamWriter xsw;
private MyNamespaceContext nc = new MyNamespaceContext();
public MyXMLStreamWriter(XMLStreamWriter xsw) throws Exception {
this.xsw = xsw;
xsw.setNamespaceContext(nc);
}
public void close() throws XMLStreamException {
xsw.close();
}
public void flush() throws XMLStreamException {
xsw.flush();
}
public NamespaceContext getNamespaceContext() {
return xsw.getNamespaceContext();
}
public String getPrefix(String arg0) throws XMLStreamException {
return xsw.getPrefix(arg0);
}
public Object getProperty(String arg0) throws IllegalArgumentException {
return xsw.getProperty(arg0);
}
public void setDefaultNamespace(String arg0) throws XMLStreamException {
xsw.setDefaultNamespace(arg0);
}
public void setNamespaceContext(NamespaceContext arg0) throws XMLStreamException {
}
public void setPrefix(String arg0, String arg1) throws XMLStreamException {
xsw.setPrefix(arg0, arg1);
}
public void writeAttribute(String arg0, String arg1) throws XMLStreamException {
xsw.writeAttribute(arg0, arg1);
}
public void writeAttribute(String arg0, String arg1, String arg2) throws XMLStreamException {
xsw.writeAttribute(arg0, arg1, arg2);
}
public void writeAttribute(String arg0, String arg1, String arg2, String arg3) throws XMLStreamException {
xsw.writeAttribute(arg0, arg1, arg2, arg3);
}
public void writeCData(String arg0) throws XMLStreamException {
xsw.writeCData(arg0);
}
public void writeCharacters(String arg0) throws XMLStreamException {
xsw.writeCharacters(arg0);
}
public void writeCharacters(char[] arg0, int arg1, int arg2) throws XMLStreamException {
xsw.writeCharacters(arg0, arg1, arg2);
}
public void writeComment(String arg0) throws XMLStreamException {
xsw.writeComment(arg0);
}
public void writeDTD(String arg0) throws XMLStreamException {
xsw.writeDTD(arg0);
}
public void writeDefaultNamespace(String arg0) throws XMLStreamException {
xsw.writeDefaultNamespace(arg0);
}
public void writeEmptyElement(String arg0) throws XMLStreamException {
xsw.writeEmptyElement(arg0);
}
public void writeEmptyElement(String arg0, String arg1) throws XMLStreamException {
xsw.writeEmptyElement(arg0, arg1);
}
public void writeEmptyElement(String arg0, String arg1, String arg2) throws XMLStreamException {
xsw.writeEmptyElement(arg0, arg1, arg2);
}
public void writeEndDocument() throws XMLStreamException {
xsw.writeEndDocument();
}
public void writeEndElement() throws XMLStreamException {
xsw.writeEndElement();
}
public void writeEntityRef(String arg0) throws XMLStreamException {
xsw.writeEntityRef(arg0);
}
public void writeNamespace(String arg0, String arg1) throws XMLStreamException {
}
public void writeProcessingInstruction(String arg0) throws XMLStreamException {
xsw.writeProcessingInstruction(arg0);
}
public void writeProcessingInstruction(String arg0, String arg1) throws XMLStreamException {
xsw.writeProcessingInstruction(arg0, arg1);
}
public void writeStartDocument() throws XMLStreamException {
xsw.writeStartDocument();
}
public void writeStartDocument(String arg0) throws XMLStreamException {
xsw.writeStartDocument(arg0);
}
public void writeStartDocument(String arg0, String arg1) throws XMLStreamException {
xsw.writeStartDocument(arg0, arg1);
}
public void writeStartElement(String arg0) throws XMLStreamException {
xsw.writeStartElement(arg0);
}
public void writeStartElement(String arg0, String arg1) throws XMLStreamException {
xsw.writeStartElement(arg0, arg1);
}
public void writeStartElement(String arg0, String arg1, String arg2) throws XMLStreamException {
xsw.writeStartElement("", arg1, arg2);
if(null != arg2 || arg2.length() > 0) {
String currentDefaultNS = nc.getNamespaceURI("");
if(!arg2.equals(currentDefaultNS)) {
writeDefaultNamespace(arg2);
nc.setDefaultNS(arg2);
}
}
}
private static class MyNamespaceContext implements NamespaceContext {
private String defaultNS = "";
public void setDefaultNS(String ns) {
defaultNS = ns;
}
public String getNamespaceURI(String arg0) {
if("".equals(arg0)) {
return defaultNS;
}
return null;
}
public String getPrefix(String arg0) {
return "";
}
public Iterator getPrefixes(String arg0) {
return null;
}
}
}
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