blocks|key|3299914|text|除了设置前缀之外，您还必须在某个地方声明您的命名空间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3299915|编辑如果您查看org.w3c.dom包，您会注意到除了可以使用名称空间URI创建文档节点之外，它不支持任何名称空间：|offset|length|style|CODE|3299916|DocumentBuilderFactory+factory+=+DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder+builder+=+factory.newDocumentBuilder();
DOMImplementation+DOMImplementation+=+builder.getDOMImplementation();
Document+doc+=+DOMImplementation.createDocument(
++++"http://www.somecompany.com/2005/xyz",+//+namespace
++++"root",
++++null+/*DocumentType*/);

Element+root+=+doc.getDocumentElement();
root.setPrefix("xyz");
root.setAttribute(
++++"xmlns:xyz",
++++"http://www.somecompany.com/2005/xyz");|code-block|syntax|javascript|3299917|使用Java5(及更高版本)的标准W3C+DOM，不可能修改节点的名称空间。|3299918|但W3C+DOM只是几个接口。因此，您应该尝试的是查看实现(即文档实例的实际类)，将其转换为真正的类型。这个类型应该有额外的方法，如果你幸运的话，你可以用这些方法来修改命名空间。|3299919|entityMap^0|0|7|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

In addition to setting the prefix, you must also declare your namespace somewhere.

[EDIT] If you look into the package <code>org.w3c.dom</code>, you'll notice that there is no support for namespaces whatsoever except that you can create a Document node with a namespace URI:

<pre><code>DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
DocumentBuilder builder = factory.newDocumentBuilder();
DOMImplementation DOMImplementation = builder.getDOMImplementation();
Document doc = DOMImplementation.createDocument(
 "http://www.somecompany.com/2005/xyz", // namespace
 "root",
 null /*DocumentType*/);

Element root = doc.getDocumentElement();
root.setPrefix("xyz");
root.setAttribute(
 "xmlns:xyz",
 "http://www.somecompany.com/2005/xyz");
</code></pre>

With the standard W3C DOM API of Java 5 (and up), it's not possible to modify the namespace of a node.

But the W3C DOM API is just a couple of interfaces. So what you should try is to look at the implementation (i.e. the actual class of your document instance), cast it to the real type. This type should have additional methods and if you're lucky, you can use those to modify the namespace.

blocks|key|328905|text|好了，下面是递归的“解决方案”：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328906|(我仍然希望有人能找到更好的方法来做到这一点)|328907|public+static+void+renameNamespaceRecursive(Document+doc,+Node+node,
++++++++String+namespace)+{

++++if+(node.getNodeType()+==+Node.ELEMENT_NODE)+{
++++++++System.out.println("renaming+type:+"+%2B+node.getClass()
++++++++++++%2B+",+name:+"+%2B+node.getNodeName());
++++++++doc.renameNode(node,+namespace,+node.getNodeName());
++++}

++++NodeList+list+=+node.getChildNodes();
++++for+(int+i+=+0;+i+<+list.getLength();+%2B%2Bi)+{
++++++++renameNamespaceRecursive(doc,+list.item(i),+namespace);
++++}
}|code-block|syntax|javascript|328908|似乎可以工作，尽管我不知道只重命名节点类型ELEMENT_NODE是否正确，或者是否必须重命名其他节点类型。|328909|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Well, here goes the recursive "solution": 
(I still hope that someone might find a better way to do this)

<pre><code>public static void renameNamespaceRecursive(Document doc, Node node,
 String namespace) {

 if (node.getNodeType() == Node.ELEMENT_NODE) {
 System.out.println("renaming type: " + node.getClass()
 + ", name: " + node.getNodeName());
 doc.renameNode(node, namespace, node.getNodeName());
 }

 NodeList list = node.getChildNodes();
 for (int i = 0; i &lt; list.getLength(); ++i) {
 renameNamespaceRecursive(doc, list.item(i), namespace);
 }
}
</code></pre>

Seems to work, although I don't know if it's correct to rename only the node type
ELEMENT_NODE, or if other node types must be renamed.

blocks|key|329972|text|今天我也遇到了同样的问题。我最终使用了@ivan_ivanovich_ivanoff+answer的一部分，但删除了递归并修复了一些错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|329973|非常重要：如果旧的命名空间是null，你必须添加两个翻译，一个从null到你的新namespaceURI，另一个从""到你的新namespaceURI。这是因为第一次调用renameNode会将具有null+namespaceURI的现有节点更改为xmlns=""。|style|BOLD|CODE|329974|用法示例：|329975|Document+xmlDoc+=+...;

new+XmlNamespaceTranslator()
++++.addTranslation(null,+"new_ns")
++++.addTranslation("",+"new_ns")
++++.translateNamespaces(xmlDoc);

//+xmlDoc+will+have+nodes+with+namespace+null+or+""+changed+to+"new_ns"|code-block|syntax|javascript|329976|完整的源代码如下：|329977|public++class+XmlNamespaceTranslator+{

++++private+Map<Key<String>,+Value<String>>+translations+=+new+HashMap<Key<String>,+Value<String>>();

++++public+XmlNamespaceTranslator+addTranslation(String+fromNamespaceURI,+String+toNamespaceURI)+{
++++++++Key<String>+key+=+new+Key<String>(fromNamespaceURI);
++++++++Value<String>+value+=+new+Value<String>(toNamespaceURI);

++++++++this.translations.put(key,+value);

++++++++return+this;
++++}

++++public+void+translateNamespaces(Document+xmlDoc)+{
++++++++Stack<Node>+nodes+=+new+Stack<Node>();
++++++++nodes.push(xmlDoc.getDocumentElement());

++++++++while+(!nodes.isEmpty())+{
++++++++++++Node+node+=+nodes.pop();
++++++++++++switch+(node.getNodeType())+{
++++++++++++case+Node.ATTRIBUTE_NODE:
++++++++++++case+Node.ELEMENT_NODE:
++++++++++++++++Value<String>+value+=+this.translations.get(new+Key<String>(node.getNamespaceURI()));
++++++++++++++++if+(value+!=+null)+{
++++++++++++++++++++//+the+reassignment+to+node+is+very+important.+as+per+javadoc+renameNode+will
++++++++++++++++++++//+try+to+modify+node+(first+parameter)+in+place.+If+that+is+not+possible+it
++++++++++++++++++++//+will+replace+that+node+for+a+new+created+one+and+return+it+to+the+caller.
++++++++++++++++++++//+if+we+did+not+reassign+node+we+will+get+no+childs+in+the+loop+below.
++++++++++++++++++++node+=+xmlDoc.renameNode(node,+value.getValue(),+node.getNodeName());
++++++++++++++++}
++++++++++++++++break;
++++++++++++}

++++++++++++//+for+attributes+of+this+node
++++++++++++NamedNodeMap+attributes+=+node.getAttributes();
++++++++++++if+(!(attributes+==+null+%7C%7C+attributes.getLength()+==+0))+{
++++++++++++++++for+(int+i+=+0,+count+=+attributes.getLength();+i+<+count;+%2B%2Bi)+{
++++++++++++++++++++Node+attribute+=+attributes.item(i);
++++++++++++++++++++if+(attribute+!=+null)+{
++++++++++++++++++++++++nodes.push(attribute);
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}

++++++++++++//+for+child+nodes+of+this+node
++++++++++++NodeList+childNodes+=+node.getChildNodes();
++++++++++++if+(!(childNodes+==+null+%7C%7C+childNodes.getLength()+==+0))+{
++++++++++++++++for+(int+i+=+0,+count+=+childNodes.getLength();+i+<+count;+%2B%2Bi)+{
++++++++++++++++++++Node+childNode+=+childNodes.item(i);
++++++++++++++++++++if+(childNode+!=+null)+{
++++++++++++++++++++++++nodes.push(childNode);
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++}
++++}

++++//+these+will+allow+null+values+to+be+stored+on+a+map+so+that+we+can+distinguish
++++//+from+values+being+on+the+map+or+not.+map+implementation+returns+null+if+the+there
++++//+is+no+map+element+with+a+given+key.+If+the+value+is+null+there+is+no+way+to
++++//+distinguish+from+value+not+being+on+the+map+or+value+being+null.+these+classes
++++//+remove+ambiguity.
++++private+static+class+Holder<T>+{

++++++++protected+final+T+value;

++++++++public+Holder(T+value)+{
++++++++++++this.value+=+value;
++++++++}

++++++++public+T+getValue()+{
++++++++++++return+value;
++++++++}

++++++++@Override
++++++++public+int+hashCode()+{
++++++++++++final+int+prime+=+31;
++++++++++++int+result+=+1;
++++++++++++result+=+prime+*+result+%2B+((value+==+null)+?+0+:+value.hashCode());
++++++++++++return+result;
++++++++}

++++++++@Override
++++++++public+boolean+equals(Object+obj)+{
++++++++++++if+(this+==+obj)
++++++++++++++++return+true;
++++++++++++if+(obj+==+null)
++++++++++++++++return+false;
++++++++++++if+(getClass()+!=+obj.getClass())
++++++++++++++++return+false;
++++++++++++Holder<?>+other+=+(Holder<?>)+obj;
++++++++++++if+(value+==+null)+{
++++++++++++++++if+(other.value+!=+null)
++++++++++++++++++++return+false;
++++++++++++}+else+if+(!value.equals(other.value))
++++++++++++++++return+false;
++++++++++++return+true;
++++++++}

++++}

++++private+static+class+Key<T>+extends+Holder<T>+{

++++++++public+Key(T+value)+{
++++++++++++super(value);
++++++++}

++++}

++++private+static+class+Value<T>+extends+Holder<T>+{

++++++++public+Value(T+value)+{
++++++++++++super(value);
++++++++}

++++}
}|329978|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/1492428/javadom-how-do-i-set-the-base-namespace-of-an-already-created-document/1492867#1492867^0|J|U|0|0|0|5|E|4|W|4|14|C|1L|2|1R|C|2D|A|2R|4|2W|C|3G|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|D|3|E|5|6|7|15|8|@$A|16|B|17|F|G]|$A|18|B|19|F|H]|$A|1A|B|1B|F|H]|$A|1C|B|1D|F|H]|$A|1E|B|1F|F|H]|$A|1G|B|1H|F|H]|$A|1I|B|1J|F|H]|$A|1K|B|1L|F|H]|$A|1M|B|1N|F|H]|$A|1O|B|1P|F|H]]|9|@]|C|$]]|$1|I|3|J|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|K|3|L|5|M|7|1R|8|@]|9|@]|C|$N|O]]|$1|P|3|Q|5|6|7|1S|8|@]|9|@]|C|$]]|$1|R|3|S|5|M|7|1T|8|@]|9|@]|C|$N|O]]|$1|T|3|-4|5|6|7|1U|8|@]|9|@]|C|$]]]|U|$V|$5|W|X|Y|C|$Z|10]]]]

I had the very same problem today. I ended up using parts of <a href="https://stackoverflow.com/questions/1492428/javadom-how-do-i-set-the-base-namespace-of-an-already-created-document/1492867#1492867">@ivan_ivanovich_ivanoff answer</a> but removed the recursion and fixed some bugs.

Very important: if old namespace is <code>null</code> you must add two translations, one from <code>null</code> to your new <code>namespaceURI</code> and another from <code>""</code> to your new <code>namespaceURI</code>. This happens because the first call to <code>renameNode</code> will change existing nodes that have a <code>null</code> <code>namespaceURI</code> to <code>xmlns=""</code>.

Example of usage:

<pre><code>Document xmlDoc = ...;

new XmlNamespaceTranslator()
 .addTranslation(null, "new_ns")
 .addTranslation("", "new_ns")
 .translateNamespaces(xmlDoc);

// xmlDoc will have nodes with namespace null or "" changed to "new_ns"
</code></pre>

Full source code follows:

<pre><code>public class XmlNamespaceTranslator {

 private Map&lt;Key&lt;String&gt;, Value&lt;String&gt;&gt; translations = new HashMap&lt;Key&lt;String&gt;, Value&lt;String&gt;&gt;();

 public XmlNamespaceTranslator addTranslation(String fromNamespaceURI, String toNamespaceURI) {
 Key&lt;String&gt; key = new Key&lt;String&gt;(fromNamespaceURI);
 Value&lt;String&gt; value = new Value&lt;String&gt;(toNamespaceURI);

 this.translations.put(key, value);

 return this;
 }

 public void translateNamespaces(Document xmlDoc) {
 Stack&lt;Node&gt; nodes = new Stack&lt;Node&gt;();
 nodes.push(xmlDoc.getDocumentElement());

 while (!nodes.isEmpty()) {
 Node node = nodes.pop();
 switch (node.getNodeType()) {
 case Node.ATTRIBUTE_NODE:
 case Node.ELEMENT_NODE:
 Value&lt;String&gt; value = this.translations.get(new Key&lt;String&gt;(node.getNamespaceURI()));
 if (value != null) {
 // the reassignment to node is very important. as per javadoc renameNode will
 // try to modify node (first parameter) in place. If that is not possible it
 // will replace that node for a new created one and return it to the caller.
 // if we did not reassign node we will get no childs in the loop below.
 node = xmlDoc.renameNode(node, value.getValue(), node.getNodeName());
 }
 break;
 }

 // for attributes of this node
 NamedNodeMap attributes = node.getAttributes();
 if (!(attributes == null || attributes.getLength() == 0)) {
 for (int i = 0, count = attributes.getLength(); i &lt; count; ++i) {
 Node attribute = attributes.item(i);
 if (attribute != null) {
 nodes.push(attribute);
 }
 }
 }

 // for child nodes of this node
 NodeList childNodes = node.getChildNodes();
 if (!(childNodes == null || childNodes.getLength() == 0)) {
 for (int i = 0, count = childNodes.getLength(); i &lt; count; ++i) {
 Node childNode = childNodes.item(i);
 if (childNode != null) {
 nodes.push(childNode);
 }
 }
 }
 }
 }

 // these will allow null values to be stored on a map so that we can distinguish
 // from values being on the map or not. map implementation returns null if the there
 // is no map element with a given key. If the value is null there is no way to
 // distinguish from value not being on the map or value being null. these classes
 // remove ambiguity.
 private static class Holder&lt;T&gt; {

 protected final T value;

 public Holder(T value) {
 this.value = value;
 }

 public T getValue() {
 return value;
 }

 @Override
 public int hashCode() {
 final int prime = 31;
 int result = 1;
 result = prime * result + ((value == null) ? 0 : value.hashCode());
 return result;
 }

 @Override
 public boolean equals(Object obj) {
 if (this == obj)
 return true;
 if (obj == null)
 return false;
 if (getClass() != obj.getClass())
 return false;
 Holder&lt;?&gt; other = (Holder&lt;?&gt;) obj;
 if (value == null) {
 if (other.value != null)
 return false;
 } else if (!value.equals(other.value))
 return false;
 return true;
 }

 }

 private static class Key&lt;T&gt; extends Holder&lt;T&gt; {

 public Key(T value) {
 super(value);
 }

 }

 private static class Value&lt;T&gt; extends Holder&lt;T&gt; {

 public Value(T value) {
 super(value);
 }

 }
}
</code></pre>

blocks|key|3300074|text|我们可以使用sax解析器更改xml名称空间，尝试如下|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3300075|import+java.util.ListIterator;

import+org.dom4j.Document;
import+org.dom4j.Element;
import+org.dom4j.Namespace;
import+org.dom4j.QName;
import+org.dom4j.Visitor;
import+org.dom4j.VisitorSupport;
import+org.dom4j.io.SAXReader;

public+class+VisitorExample+{

++public+static+void+main(String[]+args)+throws+Exception+{
++++Document+doc+=+new+SAXReader().read("test.xml");
++++Namespace+oldNs+=+Namespace.get("oldNamespace");
++++Namespace+newNs+=+Namespace.get("newPrefix",+"newNamespace");
++++Visitor+visitor+=+new+NamespaceChangingVisitor(oldNs,+newNs);
++++doc.accept(visitor);
++++System.out.println(doc.asXML());
++}
}

class+NamespaceChangingVisitor+extends+VisitorSupport+{
++private+Namespace+from;
++private+Namespace+to;

++public+NamespaceChangingVisitor(Namespace+from,+Namespace+to)+{
++++this.from+=+from;
++++this.to+=+to;
++}

++public+void+visit(Element+node)+{
++++Namespace+ns+=+node.getNamespace();

++++if+(ns.getURI().equals(from.getURI()))+{
++++++QName+newQName+=+new+QName(node.getName(),+to);
++++++node.setQName(newQName);
++++}

++++ListIterator+namespaces+=+node.additionalNamespaces().listIterator();
++++while+(namespaces.hasNext())+{
++++++Namespace+additionalNamespace+=+(Namespace)+namespaces.next();
++++++if+(additionalNamespace.getURI().equals(from.getURI()))+{
++++++++namespaces.remove();
++++++}
++++}
++}

}|code-block|syntax|javascript|3300076|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

we can change the xml namespace using sax parser, try this

<pre><code>import java.util.ListIterator;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Namespace;
import org.dom4j.QName;
import org.dom4j.Visitor;
import org.dom4j.VisitorSupport;
import org.dom4j.io.SAXReader;

public class VisitorExample {

 public static void main(String[] args) throws Exception {
 Document doc = new SAXReader().read("test.xml");
 Namespace oldNs = Namespace.get("oldNamespace");
 Namespace newNs = Namespace.get("newPrefix", "newNamespace");
 Visitor visitor = new NamespaceChangingVisitor(oldNs, newNs);
 doc.accept(visitor);
 System.out.println(doc.asXML());
 }
}

class NamespaceChangingVisitor extends VisitorSupport {
 private Namespace from;
 private Namespace to;

 public NamespaceChangingVisitor(Namespace from, Namespace to) {
 this.from = from;
 this.to = to;
 }

 public void visit(Element node) {
 Namespace ns = node.getNamespace();

 if (ns.getURI().equals(from.getURI())) {
 QName newQName = new QName(node.getName(), to);
 node.setQName(newQName);
 }

 ListIterator namespaces = node.additionalNamespaces().listIterator();
 while (namespaces.hasNext()) {
 Namespace additionalNamespace = (Namespace) namespaces.next();
 if (additionalNamespace.getURI().equals(from.getURI())) {
 namespaces.remove();
 }
 }
 }

}
</code></pre>

blocks|key|332194|text|Ivan的原始帖子的一个微小变化对我有效:在文档节点上设置属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|332195|xslRoot.setAttribute("xmlns:fo",+"http://www.w3.org/1999/XSL/Format");|code-block|syntax|javascript|332196|哪里|332197|332198|xslRoot是文档/根元素/节点，|unordered-list-item|332199|fo是命名空间ID|332200|332201|希望这对某些人有帮助！|332202|迈克·瓦茨|332203|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|X|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$]]|$1|M|3|N|5|L|7|10|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|12|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|13|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|U|$]]

A slight variation of Ivan's original post worked for me: setting the attribute on the document node.

<pre><code>xslRoot.setAttribute("xmlns:fo", "http://www.w3.org/1999/XSL/Format");
</code></pre>

where

<ul>
<li>xslRoot is the document/root element/node,</li>
<li>fo is the namespace ID</li>
</ul>

Hope that helps someone!

Mike Watts

blocks|key|327346|text|如果您可以使用Xerces类，则可以创建一个DOMParser，将属性和元素的URI替换为已修复的URI：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|327347|import+org.apache.xerces.parsers.DOMParser;

public+static+class+MyDOMParser+extends+DOMParser+{
++++private+Map<String,+String>+fixupMap+=+...;

++++@Override
++++protected+Attr+createAttrNode(QName+attrQName)
++++{
++++++++if+(fixupMap.containsKey(attrQName.uri))
++++++++++++attrQName.uri+=+fixupMap.get(attrQName.uri);
++++++++return+super.createAttrNode(attrQName);
++++}

++++@Override
++++protected+Element+createElementNode(QName+qName)
++++{
++++++++if+(fixupMap.containsKey(qName.uri))
++++++++++++qName.uri+=+fixupMap.get(qName.uri);
++++++++return+super.createElementNode(qName);
++++}+++++++
}|code-block|syntax|javascript|327348|在别处，您可以解析|327349|DOMParse+p+=+new+MyDOMParser(...);
p.parse(new+InputSource(inputStream));
Document+doc+=+p.getDocument();|327350|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If you are ok with using the Xerces classes, you can create a DOMParser that replaces the URI of attributes and elements with your fixed up URIs:

<pre><code>import org.apache.xerces.parsers.DOMParser;

public static class MyDOMParser extends DOMParser {
 private Map&lt;String, String&gt; fixupMap = ...;

 @Override
 protected Attr createAttrNode(QName attrQName)
 {
 if (fixupMap.containsKey(attrQName.uri))
 attrQName.uri = fixupMap.get(attrQName.uri);
 return super.createAttrNode(attrQName);
 }

 @Override
 protected Element createElementNode(QName qName)
 {
 if (fixupMap.containsKey(qName.uri))
 qName.uri = fixupMap.get(qName.uri);
 return super.createElementNode(qName);
 } 
}
</code></pre>

The elsewhere, you can parse the 

<pre><code>DOMParse p = new MyDOMParser(...);
p.parse(new InputSource(inputStream));
Document doc = p.getDocument();
</code></pre>

blocks|key|3300212|text|假设您已经有了文档实例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3300213|import+org.dom4j.*;

{

++++static+final+String+++++++++YOUR_NAMESPACE_PREFIX+=+++"PREFIX";+
++++static+final+String+++++++++YOUR_NAMESPACE_URI++++=+++"URI";+

++++Document+document+=+...

++++//now+get+the+root+element
++++Element+element+=+document.getRootElement();
++++renameNamespaceRecursive(element);
++++...

++++//End+of+this+method
}

//the+recursive+method+for+the+operation
void+renameNamespaceRecursive(Element+element)+{
++++element.setQName(new+QName(element.getName(),+DocumentHelper.createNamespace(YOUR_NAMESPACE_PREFIX,+YOUR_NAMESPACE_URI)));
++++for+(Iterator+i++=+element.elementIterator();+i.hasNext();)+{
++++++++renameNamespaceRecursive((Element)i.next());
++++}
}|code-block|syntax|javascript|3300214|这应该可以了。|3300215|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Let's say you've got your Document instance..

<pre><code>import org.dom4j.*;

{

 static final String YOUR_NAMESPACE_PREFIX = "PREFIX"; 
 static final String YOUR_NAMESPACE_URI = "URI"; 

 Document document = ...

 //now get the root element
 Element element = document.getRootElement();
 renameNamespaceRecursive(element);
 ...

 //End of this method
}

//the recursive method for the operation
void renameNamespaceRecursive(Element element) {
 element.setQName(new QName(element.getName(), DocumentHelper.createNamespace(YOUR_NAMESPACE_PREFIX, YOUR_NAMESPACE_URI)));
 for (Iterator i = element.elementIterator(); i.hasNext();) {
 renameNamespaceRecursive((Element)i.next());
 }
}
</code></pre>

That should do.

blocks|key|328960|text|我用org.jdom.Element解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328961|Java：|328962|import+org.jdom.Element;
...
Element+kml+=+new+Element("kml",+"http://www.opengis.net/kml/2.2");|code-block|syntax|javascript|328963|XML：|328964|<kml+xmlns="http://www.opengis.net/kml/2.2">;+
...
</kml>|328965|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I solved using org.jdom.Element:

Java:

<pre><code>import org.jdom.Element;
...
Element kml = new Element("kml", "http://www.opengis.net/kml/2.2");
</code></pre>

XML:

<pre><code>&lt;kml xmlns="http://www.opengis.net/kml/2.2"&gt;; 
...
&lt;/kml&gt;
</code></pre>

I am dealing with an already created Document object.
I have to be able to set it's base namespace (attribute name "xmlns") to certain value.
My input is DOM and is something like:

<pre><code>&lt;root&gt;...some content...&lt;/root&gt;
</code></pre>

What I need is DOM which is something like:

<pre><code>&lt;root xmlns="myNamespace"&gt;...some content...&lt;/root&gt;
</code></pre>

That's it. Easy, isn't it? Wrong! Not with DOM!

<h1>I have tried the following:</h1>

<h3>1) Using doc.getDocumentElement().setAttribute("xmlns","myNamespace")</h3>

I get a document with empty xmlns (it works on any other attribute name!)

<pre><code>&lt;root xmlns=""&gt;...&lt;/root&gt;
</code></pre>

<h3>2) Using renameNode(...)</h3>

First clone the document:

<pre><code>Document input = /*that external Document whose namespace I want to alter*/;

DocumentBuilderFactory BUILDER_FACTORY_NS = DocumentBuilderFactory.newInstance();
BUILDER_FACTORY_NS.setNamespaceAware(true);
Document output = BUILDER_NS.newDocument();
output.appendChild(output.importNode(input.getDocumentElement(), true));
</code></pre>

I'm really missing document.clone(), but perhaps it's just me.

Now rename the root node:

<pre><code>output.renameNode(output.getDocumentElement(),"myNamespace",
 output.getDocumentElement().getTagName());
</code></pre>

Now isn't that straightforward? ;)

What I get now is:

<pre><code>&lt;root xmlns="myNamespace"&gt;
 &lt;someElement xmlns=""/&gt;
 &lt;someOtherElement xmlns=""/&gt;
&lt;/root&gt;
</code></pre>

So (as all of us have expected, right?), this renames the namespace only of the the root node.

Curse you, DOM!

Is there any way to do this recursively (without writing an own recursive method)?

<h3>Please help ;)</h3>

Please don't advice me to do some fancy workaround, such as transforming DOM to
something else, alter the namespace there, and transform it back.
I need DOM because it's the fastest standard way to manipulate XML.

Note: I'm using the latest JDK.

EDIT 
Removed wrong assumptions from the question, which had to do with namespace prefix.

Java+DOM: How do I set the base namespace of an (already created) Document?

Java

我正在处理一个已经创建了文档对象的。我必须能够将它的基本名称空间(属性名"xmlns")设置为特定值。我的输入是DOM，类似于：<root>...some content...</root>我需要的是DOM，它类似于：<root xmlns="myNamespace">...some content...</root>...

问Java+DOM:如何设置(已经创建的)文档的基本名称空间？
EN

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