Java DOM XML正在跳过xmlns属性 [英] Java DOM XML is skipping xmlns properties

问题描述

我需要在Java中生成一个xml文件，所以我选择使用DOM（直到一切都可以），这里是我需要创建的根标签。

 <？xml version =1.0encoding =utf-8？> 
< KeyContainer Version =1.0xmlns =urn：ietf：params：xml：ns：keyprov：pskc：1.0xmlns：ds =http://www.w3.org/2000/09/ xmldsig＃xmlns：xenc =http://www.w3.org/2001/04/xmlenc#xmlns：xml =http://www.w3.org/XML/1998/namespace> 
  

这是我的源代码

  PrintWriter out = new PrintWriter（path）; 
文档xmldoc = null; 
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance（）; 
 DocumentBuilder builder = factory.newDocumentBuilder（）; 
 DOMImplementation impl = builder.getDOMImplementation（）; 
元素e = null; 
 Node n = null; 
 xmldoc = impl.createDocument（null，KeyContainer，null）; 
 / * Noeuds非bouclés* / 
元素keycontainer = xmldoc.getDocumentElement（）; 
 keycontainer.setAttributeNS（null，Version，1.0）; 
 keycontainer.setAttributeNS（http://www.w3.org/2000/xmlns/，xmlns：ds，http://www.w3.org/2000/09/xmldsig#） ; 
 keycontainer.setAttributeNS（http://www.w3.org/2000/xmlns/，xmlns：xenc，http://www.w3.org/2001/04/xmlenc#） ; 
 keycontainer.setAttributeNS（http://www.w3.org/2000/xmlns/，xmlns：xml，http://www.w3.org/XML/1998/namespace）; 
 keycontainer.setAttributeNS（http://www.w3.org/2000/xmlns/，xmlns，urn：ietf：params：xml：ns：keyprov：pskc：1.0）; 
 / *非相关信息* / 
 DOMSource domSource = new DOMSource（xmldoc）; 
 StreamResult streamResult = new StreamResult（out）; 
 TransformerFactory tf = TransformerFactory.newInstance（）; 
 Transformer serializer = tf.newTransformer（）; 
 serializer.setOutputProperty（OutputKeys.ENCODING，utf-8）; 
 serializer.setOutputProperty（OutputKeys.VERSION，1.0）; 
 serializer.setOutputProperty（OutputKeys.INDENT，yes）; 
 serializer.setOutputProperty（OutputKeys.STANDALONE，yes）; 
 serializer.transform（domSource，streamResult）; 
  

这里是我得到的

 <？xml version =1.0encoding =utf-8standalone =no？> 
< KeyContainer xmlns =xmlns：ds =http://www.w3.org/2000/09/xmldsig#xmlns：xenc =http://www.w3.org/2001/ 04 / xmlenc＃Version =1.0> 
  

问题是xmlns属性是空的，xmlns：xml丢失，我该怎么做所有信息？

感谢很多stackoverflow

（PS：有NAMESPACE_ERR，除了 http://www.w3.org/2000/xmlns/ 在NamespaceURI字段中）

解决方案

需要两件事才能摆脱 xmlns =

创建具有所需命名空间URI的文档：

  xmldoc = impl.createDocument（urn：ietf：params：xml：ns：keyprov：pskc：1.0，KeyContainer，null）; 
  

删除以下行，因为现在不必要了：

  keycontainer.setAttributeNS（http://www.w3.org/2000/xmlns/，xmlns，urn：ietf：params：xml：ns：keyprov ：pskc：1.0\" ）; 
  

关于 xmlns：xml 属性， API正在默默地丢弃它。请参阅 NamespaceMappings 。一些研究发现，声明特定命名空间的行为未定义，不推荐。

I need to generate an xml file in Java, so I chose to use DOM (until there everything is ok), here is the root tag of what i need to create

<?xml version="1.0" encoding="utf-8"?>
<KeyContainer Version="1.0" xmlns="urn:ietf:params:xml:ns:keyprov:pskc:1.0" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#" xmlns:xml="http://www.w3.org/XML/1998/namespace">

Here is my source code

PrintWriter out = new PrintWriter(path);
Document xmldoc = null;
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        DOMImplementation impl = builder.getDOMImplementation();
        Element e = null;
        Node n = null;
        xmldoc = impl.createDocument(null, "KeyContainer", null);
        /* Noeuds non bouclés */
        Element keycontainer = xmldoc.getDocumentElement();
            keycontainer.setAttributeNS(null, "Version", "1.0");
            keycontainer.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:ds","http://www.w3.org/2000/09/xmldsig#");
            keycontainer.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xenc", "http://www.w3.org/2001/04/xmlenc#");
            keycontainer.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:xml", "http://www.w3.org/XML/1998/namespace");
            keycontainer.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns", "urn:ietf:params:xml:ns:keyprov:pskc:1.0");
/* Non relevant Info*/
DOMSource domSource = new DOMSource(xmldoc);
        StreamResult streamResult = new StreamResult(out);
        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer serializer = tf.newTransformer();
        serializer.setOutputProperty(OutputKeys.ENCODING,"utf-8");
        serializer.setOutputProperty(OutputKeys.VERSION,"1.0");
        serializer.setOutputProperty(OutputKeys.INDENT,"yes");
        serializer.setOutputProperty(OutputKeys.STANDALONE,"yes");
        serializer.transform(domSource, streamResult); 

And here is what I get

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<KeyContainer xmlns="" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#" Version="1.0">

Problem is the xmlns property is empty, and xmlns:xml is missing, what can I do to get all information ?

Thanks a lot stackoverflow

(PS : Got NAMESPACE_ERR if anything else than "http://www.w3.org/2000/xmlns/" in NamespaceURI field)

解决方案

Two things are required to get rid of xmlns=""

Create the Document with the desired namespace URI as such:

xmldoc = impl.createDocument("urn:ietf:params:xml:ns:keyprov:pskc:1.0", "KeyContainer", null);

Remove the following line as it is now unnecessary:

keycontainer.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns", "urn:ietf:params:xml:ns:keyprov:pskc:1.0");

Regarding the xmlns:xml attribute, the API is silently dropping it. See line 173 of NamespaceMappings. A bit of research turns up that the behavior of declaring that particular namespace is undefined and is not recommended.

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