How do I load an org w3c dom Document from XML in a string

Question

I have a complete XML document in a string and would like a Document object  Google turns up all sorts of garbage  What is the simplest solution   In Java 1 5   Solution Thanks to Matt McMinn  I have settled on this implementation  It has the right level of input flexibility and exception granularity for me   It s good to know if the error came from malformed XML - SAXException - or just bad IO - IOException    public static org w3c dom Document loadXMLFrom String xml      throws org xml sax SAXException  java io IOException       return loadXMLFrom new java io ByteArrayInputStream xml getBytes         public static org w3c dom Document loadXMLFrom java io InputStream is       throws org xml sax SAXException  java io IOException       javax xml parsers DocumentBuilderFactory factory           javax xml parsers DocumentBuilderFactory newInstance        factory setNamespaceAware true       javax xml parsers DocumentBuilder builder   null      try           builder   factory newDocumentBuilder              catch  javax xml parsers ParserConfigurationException ex                org w3c dom Document doc   builder parse is       is close        return doc

User · Answer

Whoa there    There s a potentially serious problem with this code  because it ignores the character encoding specified in the String  which is UTF-8 by default   When you call String getBytes   the platform default encoding is used to encode Unicode characters to bytes  So  the parser may think it s getting UTF-8 data when in fact it s getting EBCDIC or something hellip  not pretty   Instead  use the parse method that takes an InputSource  which can be constructed with a Reader  like this   import java io StringReader  import org xml sax InputSource              return builder parse new InputSource new StringReader xml       It may not seem like a big deal  but ignorance of character encoding issues leads to insidious code rot akin to y2k

User · Answer

This works for me in Java 1 5 - I stripped out specific exceptions for readability   import javax xml parsers DocumentBuilderFactory  import javax xml parsers DocumentBuilder  import org w3c dom Document  import java io ByteArrayInputStream   public Document loadXMLFromString String xml  throws Exception       DocumentBuilderFactory factory   DocumentBuilderFactory newInstance         factory setNamespaceAware true       DocumentBuilder builder   factory newDocumentBuilder         return builder parse new ByteArrayInputStream xml getBytes

User · Answer

Just had a similar problem  except i needed a NodeList and not a Document  here s what I came up with   It s mostly the same solution as before  augmented to get the root element down as a NodeList and using erickson s suggestion of using an InputSource instead for character encoding issues   private String DOC ROOT  root   String xml getXmlString    Document xmlDoc loadXMLFrom xml   Element template xmlDoc getDocumentElement    NodeList nodes xmlDoc getElementsByTagName DOC ROOT    public static Document loadXMLFrom String xml  throws Exception           InputSource is  new InputSource new StringReader xml            DocumentBuilderFactory factory   DocumentBuilderFactory newInstance            factory setNamespaceAware true           DocumentBuilder builder   null          builder   factory newDocumentBuilder            Document doc   builder parse is           return doc

User · Answer

To manipulate XML in Java  I always tend to use the Transformer API   import javax xml transform Source  import javax xml transform TransformerException  import javax xml transform TransformerFactory  import javax xml transform dom DOMResult  import javax xml transform stream StreamSource   public static Document loadXMLFrom String xml  throws TransformerException       Source source   new StreamSource new StringReader xml        DOMResult result   new DOMResult        TransformerFactory newInstance   newTransformer   transform source   result       return  Document  result getNode

[java] How do I load an org.w3c.dom.Document from XML in a string?

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