Convert String XML fragment to Document Node in Java

Question

In Java how can you convert a String that represents a fragment of XML for insertion into an XML document   e g    String newNode      lt node gt value lt  node gt       Convert this to XML   Then insert this node into an org w3c dom Document as the child of a given node

User · Answer

and if you re using purely XOM  something like this       String xml     lt fakeRoot gt     xml     lt  fakeRoot gt        Document doc   new Builder  false   build  xml  null        Nodes children   doc getRootElement   removeChildren        for  int ix   0  ix  lt  children size    ix               otherDocumentElement appendChild  children get  ix              XOM uses fakeRoot internally to do pretty much the same  so it should be safe  if not exactly elegant

User · Answer

Here s yet another solution  using the XOM library  that competes with my dom4j answer   This is part of my quest to find a good dom4j replacement where XOM was suggested as one option    First read the XML fragment into a nu xom Document   String newNode     lt node gt value lt  node gt       Convert this to XML Document newNodeDocument   new Builder   build newNode         Then  get the Document and the Node under which the fragment is added  Again  for testing purposes I ll create the Document from a string   Document originalDoc   new Builder   build   lt root gt  lt given gt  lt  given gt  lt  root gt         Element givenNode   originalDoc getRootElement   getFirstChildElement  given      Now  adding the child node is simple  and similar as with dom4j  except that XOM doesn t let you add the original root element which already belongs to newNodeDocument    givenNode appendChild newNodeDocument getRootElement   copy       Outputting the document yields the correct result XML  and is remarkably easy with XOM  just print the string returned by originalDoc toXML        lt  xml version  1 0   gt   lt root gt  lt given gt  lt node gt value lt  node gt  lt  given gt  lt  root gt     If you wanted to format the XML nicely  with indentations and linefeeds   use a Serializer  thanks to Peter   tibran   for pointing this out    So  admittedly this isn t very different from the dom4j solution     However  XOM may be a little nicer to work with  because the API is better documented  and because of its design philosophy that there s one canonical way for doing each thing   Appendix  Again  here s how to convert between org w3c dom Document and nu xom Document  Use the helper methods in XOM s DOMConverter class      w3c - gt  xom Document xomDoc   DOMConverter convert w3cDoc       xom - gt  w3c org w3c dom Document w3cDoc   DOMConverter convert xomDoc  domImplementation        You can get a DOMImplementation instance e g  from DOMImplementationRegistry

User · Answer

Try jcabi-xml  with a one liner   Node node   new XMLDocument   lt node gt value lt  node gt    node

User · Answer

Convert a string to a Document Object      param xml The xml to convert    return A document Object    throws IOException    throws SAXException    throws ParserConfigurationException    public static Document string2Document String xml  throws IOException  SAXException  ParserConfigurationException        if  xml    null      return null       return inputStream2Document new ByteArrayInputStream xml getBytes                 Convert an inputStream to a Document Object    param inputStream The inputstream to convert    return a Document Object    throws IOException    throws SAXException    throws ParserConfigurationException    public static Document inputStream2Document InputStream inputStream  throws IOException  SAXException  ParserConfigurationException       DocumentBuilderFactory newInstance   DocumentBuilderFactory newInstance        newInstance setNamespaceAware true       Document parse   newInstance newDocumentBuilder   parse inputStream       return parse

User · Answer

You can use the document s import  or adopt  method to add XML fragments               param docBuilder               the parser       param parent               node to add fragment to       param fragment               a well formed XML fragment         public static void appendXmlFragment        DocumentBuilder docBuilder  Node parent        String fragment  throws IOException  SAXException       Document doc   parent getOwnerDocument        Node fragmentNode   docBuilder parse          new InputSource new StringReader fragment             getDocumentElement        fragmentNode   doc importNode fragmentNode  true       parent appendChild fragmentNode

User · Answer

If you re using dom4j  you can just do   Document document   DocumentHelper parseText text     dom4j now found here   https   github com dom4j dom4j

User · Answer

For what it s worth  here s a solution I came up with using the dom4j library   I did check that it works    Read the XML fragment into a org dom4j Document  note  all the XML classes used below are from org dom4j  see Appendix       String newNode     lt node gt value lt  node gt       Convert this to XML   SAXReader reader   new SAXReader      Document newNodeDocument   reader read new StringReader newNode      Then get the Document into which the new node is inserted  and the parent Element  to be  from it   Your org w3c dom Document would need to be converted to org dom4j Document here   For testing purposes  I created one like this       Document originalDoc          new SAXReader   read new StringReader   lt root gt  lt given gt  lt  given gt  lt  root gt          Element givenNode   originalDoc getRootElement   element  given      Adding the new child element is very simple       givenNode add newNodeDocument getRootElement       Done  Outputting originalDoc now yields     lt  xml version  1 0  encoding  utf-8   gt    lt root gt       lt given gt           lt node gt value lt  node gt       lt  given gt   lt  root gt    Appendix  Because your question talks about org w3c dom Document  here s how to convert between that and org dom4j Document      dom4j - gt  w3c DOMWriter writer   new DOMWriter    org w3c dom Document w3cDoc   writer write dom4jDoc       w3c - gt  dom4j DOMReader reader   new DOMReader    Document dom4jDoc   reader read w3cDoc      If you d need both kind of Documents regularly  it might make sense to put these in neat utility methods  maybe in a class called XMLUtils or something like that    Maybe there are better ways to do this  even without any 3rd party libraries  But out of the solutions presented so far  in my view this is the easiest way  even if you need to do the dom4j  lt -  w3c conversions   Update  2011   before adding dom4j dependency to your code  note that it is not an actively maintained project  and has some other problems too  Improved version 2 0 has been in the works for ages  but there s only an alpha version available  You may want to consider an alternative  like XOM  instead  read more in the question linked above

User · Answer

Element node    DocumentBuilderFactory      newInstance        newDocumentBuilder        parse new ByteArrayInputStream   lt node gt value lt  node gt   getBytes          getDocumentElement

[java] Convert String XML fragment to Document Node in Java

Examples related to java

Examples related to xml

Examples related to string