Java/XML/Namespace

Материал из Java эксперт
Версия от 18:01, 31 мая 2010; (обсуждение)
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Access elements from document with namespaces

     
 
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
public class Main {
  public static void main(String[] argv) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setNamespaceAware(true);
    factory.setValidating(true);
    DocumentBuilder loader = factory.newDocumentBuilder();
    Document document = loader.parse("sample.xml");
    String docNS = "http://www.my-company.ru";
    Element order = document.getDocumentElement();
    Attr date = order.getAttributeNodeNS(docNS, "date");
    NodeList children = order.getElementsByTagNameNS(docNS, "item");
  }
}





Add a namespace prefix definition to an element.

  
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
public class Utils {
  /**
   * Add a namespace prefix definition to an element.
   * 
   * @param element
   * @param namespaceUri
   * @param prefix
   */
  public static void addNamespacePrefix(Element element, String namespaceUri, String prefix) {
      element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, "xmlns:" + prefix, namespaceUri);
  }
}





Attribute with Namespace

      
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
public class MainClass {
  public static void main(String[] args) throws Exception {
    XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
    XMLStreamWriter writer = outputFactory.createXMLStreamWriter(System.out);
    writer.writeStartElement("ns1", "sample", "http://www.e.ru/ns1");
    writer.writeNamespace("ns1", "http://www.e.ru/ns1");
    writer.writeAttribute("http://www.e.ru/ns2", "attribute", "true");
    writer.writeEmptyElement("http://www.e.ru/ns1", "inner");
    writer.writeEmptyElement("ns2", "inner", "http://www.e.ru/ns2");
    writer.writeEndElement();
    writer.writeEndDocument();
    writer.flush();
  }
}





Build a QName from the element name

 
import javax.xml.namespace.QName;
import org.w3c.dom.Element;
public class Utils {
  /**
   * Build a QName from the element name
   * @param el
   * @return
   */
  public static QName getQName(Element el) {
      if (el == null) {
          return null;
      } else if (el.getPrefix() != null) {
          return new QName(el.getNamespaceURI(), el.getLocalName(), el.getPrefix());
      } else {
          return new QName(el.getNamespaceURI(), el.getLocalName());
      }
  }
}





Checks whether the supplied String is an NCName (Namespace Classified Name)

    
/*
 * Copyright Aduna (http://www.aduna-software.ru/) (c) 1997-2006.
 *
 * Licensed under the Aduna BSD-style license.
 */

public class Utils {
  /**
   * Checks whether the supplied String is an NCName (Namespace Classified
   * Name) as specified at
   * .
   */
  public static final boolean isNCName(String name) {
    int nameLength = name.length();
    if (nameLength == 0) {
      return false;
    }
    // Check first character
    char c = name.charAt(0);
    if (c == "_" || isLetter(c)) {
      // Check the rest of the characters
      for (int i = 1; i < nameLength; i++) {
        c = name.charAt(i);
        if (!isNCNameChar(c)) {
          return false;
        }
      }
      // All characters have been checked
      return true;
    }
    return false;
  }
  public static final boolean isNCNameChar(char c) {
    return 
      _isAsciiBaseChar(c) ||
      _isAsciiDigit(c) ||
      c == "." || c == "-" || c == "_" ||
      _isNonAsciiBaseChar(c) ||
      _isNonAsciiDigit(c) ||
      isIdeographic(c) ||
      isCombiningChar(c) ||
      isExtender(c);
  }
  public static final boolean isLetter(char c) {
    return
      _isAsciiBaseChar(c) ||
      _isNonAsciiBaseChar(c) ||
      isIdeographic(c);
  }
  private static final boolean _isAsciiBaseChar(char c) {
    return
      _charInRange(c, 0x0041, 0x005A) ||
      _charInRange(c, 0x0061, 0x007A);
  }
  private static final boolean _isNonAsciiBaseChar(char c) {
    return
      _charInRange(c, 0x00C0, 0x00D6) ||
      _charInRange(c, 0x00D8, 0x00F6) ||
      _charInRange(c, 0x00F8, 0x00FF) ||
      _charInRange(c, 0x0100, 0x0131) ||
      _charInRange(c, 0x0134, 0x013E) ||
      _charInRange(c, 0x0141, 0x0148) ||
      _charInRange(c, 0x014A, 0x017E) ||
      _charInRange(c, 0x0180, 0x01C3) ||
      _charInRange(c, 0x01CD, 0x01F0) ||
      _charInRange(c, 0x01F4, 0x01F5) ||
      _charInRange(c, 0x01FA, 0x0217) ||
      _charInRange(c, 0x0250, 0x02A8) ||
      _charInRange(c, 0x02BB, 0x02C1) ||
      c == 0x0386 ||
      _charInRange(c, 0x0388, 0x038A) ||
      c == 0x038C ||
      _charInRange(c, 0x038E, 0x03A1) ||
      _charInRange(c, 0x03A3, 0x03CE) ||
      _charInRange(c, 0x03D0, 0x03D6) ||
      c == 0x03DA ||
      c == 0x03DC ||
      c == 0x03DE ||
      c == 0x03E0 ||
      _charInRange(c, 0x03E2, 0x03F3) ||
      _charInRange(c, 0x0401, 0x040C) ||
      _charInRange(c, 0x040E, 0x044F) ||
      _charInRange(c, 0x0451, 0x045C) ||
      _charInRange(c, 0x045E, 0x0481) ||
      _charInRange(c, 0x0490, 0x04C4) ||
      _charInRange(c, 0x04C7, 0x04C8) ||
      _charInRange(c, 0x04CB, 0x04CC) ||
      _charInRange(c, 0x04D0, 0x04EB) ||
      _charInRange(c, 0x04EE, 0x04F5) ||
      _charInRange(c, 0x04F8, 0x04F9) ||
      _charInRange(c, 0x0531, 0x0556) ||
      c == 0x0559 ||
      _charInRange(c, 0x0561, 0x0586) ||
      _charInRange(c, 0x05D0, 0x05EA) ||
      _charInRange(c, 0x05F0, 0x05F2) ||
      _charInRange(c, 0x0621, 0x063A) ||
      _charInRange(c, 0x0641, 0x064A) ||
      _charInRange(c, 0x0671, 0x06B7) ||
      _charInRange(c, 0x06BA, 0x06BE) ||
      _charInRange(c, 0x06C0, 0x06CE) ||
      _charInRange(c, 0x06D0, 0x06D3) ||
      c == 0x06D5 ||
      _charInRange(c, 0x06E5, 0x06E6) ||
      _charInRange(c, 0x0905, 0x0939) ||
      c == 0x093D ||
      _charInRange(c, 0x0958, 0x0961) ||
      _charInRange(c, 0x0985, 0x098C) ||
      _charInRange(c, 0x098F, 0x0990) ||
      _charInRange(c, 0x0993, 0x09A8) ||
      _charInRange(c, 0x09AA, 0x09B0) ||
      c == 0x09B2 ||
      _charInRange(c, 0x09B6, 0x09B9) ||
      _charInRange(c, 0x09DC, 0x09DD) ||
      _charInRange(c, 0x09DF, 0x09E1) ||
      _charInRange(c, 0x09F0, 0x09F1) ||
      _charInRange(c, 0x0A05, 0x0A0A) ||
      _charInRange(c, 0x0A0F, 0x0A10) ||
      _charInRange(c, 0x0A13, 0x0A28) ||
      _charInRange(c, 0x0A2A, 0x0A30) ||
      _charInRange(c, 0x0A32, 0x0A33) ||
      _charInRange(c, 0x0A35, 0x0A36) ||
      _charInRange(c, 0x0A38, 0x0A39) ||
      _charInRange(c, 0x0A59, 0x0A5C) ||
      c == 0x0A5E ||
      _charInRange(c, 0x0A72, 0x0A74) ||
      _charInRange(c, 0x0A85, 0x0A8B) ||
      c == 0x0A8D ||
      _charInRange(c, 0x0A8F, 0x0A91) ||
      _charInRange(c, 0x0A93, 0x0AA8) ||
      _charInRange(c, 0x0AAA, 0x0AB0) ||
      _charInRange(c, 0x0AB2, 0x0AB3) ||
      _charInRange(c, 0x0AB5, 0x0AB9) ||
      c == 0x0ABD ||
      c == 0x0AE0 ||
      _charInRange(c, 0x0B05, 0x0B0C) ||
      _charInRange(c, 0x0B0F, 0x0B10) ||
      _charInRange(c, 0x0B13, 0x0B28) ||
      _charInRange(c, 0x0B2A, 0x0B30) ||
      _charInRange(c, 0x0B32, 0x0B33) ||
      _charInRange(c, 0x0B36, 0x0B39) ||
      c == 0x0B3D ||
      _charInRange(c, 0x0B5C, 0x0B5D) ||
      _charInRange(c, 0x0B5F, 0x0B61) ||
      _charInRange(c, 0x0B85, 0x0B8A) ||
      _charInRange(c, 0x0B8E, 0x0B90) ||
      _charInRange(c, 0x0B92, 0x0B95) ||
      _charInRange(c, 0x0B99, 0x0B9A) ||
      c == 0x0B9C ||
      _charInRange(c, 0x0B9E, 0x0B9F) ||
      _charInRange(c, 0x0BA3, 0x0BA4) ||
      _charInRange(c, 0x0BA8, 0x0BAA) ||
      _charInRange(c, 0x0BAE, 0x0BB5) ||
      _charInRange(c, 0x0BB7, 0x0BB9) ||
      _charInRange(c, 0x0C05, 0x0C0C) ||
      _charInRange(c, 0x0C0E, 0x0C10) ||
      _charInRange(c, 0x0C12, 0x0C28) ||
      _charInRange(c, 0x0C2A, 0x0C33) ||
      _charInRange(c, 0x0C35, 0x0C39) ||
      _charInRange(c, 0x0C60, 0x0C61) ||
      _charInRange(c, 0x0C85, 0x0C8C) ||
      _charInRange(c, 0x0C8E, 0x0C90) ||
      _charInRange(c, 0x0C92, 0x0CA8) ||
      _charInRange(c, 0x0CAA, 0x0CB3) ||
      _charInRange(c, 0x0CB5, 0x0CB9) ||
      c == 0x0CDE ||
      _charInRange(c, 0x0CE0, 0x0CE1) ||
      _charInRange(c, 0x0D05, 0x0D0C) ||
      _charInRange(c, 0x0D0E, 0x0D10) ||
      _charInRange(c, 0x0D12, 0x0D28) ||
      _charInRange(c, 0x0D2A, 0x0D39) ||
      _charInRange(c, 0x0D60, 0x0D61) ||
      _charInRange(c, 0x0E01, 0x0E2E) ||
      c == 0x0E30 ||
      _charInRange(c, 0x0E32, 0x0E33) ||
      _charInRange(c, 0x0E40, 0x0E45) ||
      _charInRange(c, 0x0E81, 0x0E82) ||
      c == 0x0E84 ||
      _charInRange(c, 0x0E87, 0x0E88) ||
      c == 0x0E8A ||
      c == 0x0E8D ||
      _charInRange(c, 0x0E94, 0x0E97) ||
      _charInRange(c, 0x0E99, 0x0E9F) ||
      _charInRange(c, 0x0EA1, 0x0EA3) ||
      c == 0x0EA5 ||
      c == 0x0EA7 ||
      _charInRange(c, 0x0EAA, 0x0EAB) ||
      _charInRange(c, 0x0EAD, 0x0EAE) ||
      c == 0x0EB0 ||
      _charInRange(c, 0x0EB2, 0x0EB3) ||
      c == 0x0EBD ||
      _charInRange(c, 0x0EC0, 0x0EC4) ||
      _charInRange(c, 0x0F40, 0x0F47) ||
      _charInRange(c, 0x0F49, 0x0F69) ||
      _charInRange(c, 0x10A0, 0x10C5) ||
      _charInRange(c, 0x10D0, 0x10F6) ||
      c == 0x1100 ||
      _charInRange(c, 0x1102, 0x1103) ||
      _charInRange(c, 0x1105, 0x1107) ||
      c == 0x1109 ||
      _charInRange(c, 0x110B, 0x110C) ||
      _charInRange(c, 0x110E, 0x1112) ||
      c == 0x113C ||
      c == 0x113E ||
      c == 0x1140 ||
      c == 0x114C ||
      c == 0x114E ||
      c == 0x1150 ||
      _charInRange(c, 0x1154, 0x1155) ||
      c == 0x1159 ||
      _charInRange(c, 0x115F, 0x1161) ||
      c == 0x1163 ||
      c == 0x1165 ||
      c == 0x1167 ||
      c == 0x1169 ||
      _charInRange(c, 0x116D, 0x116E) ||
      _charInRange(c, 0x1172, 0x1173) ||
      c == 0x1175 ||
      c == 0x119E ||
      c == 0x11A8 ||
      c == 0x11AB ||
      _charInRange(c, 0x11AE, 0x11AF) ||
      _charInRange(c, 0x11B7, 0x11B8) ||
      c == 0x11BA ||
      _charInRange(c, 0x11BC, 0x11C2) ||
      c == 0x11EB ||
      c == 0x11F0 ||
      c == 0x11F9 ||
      _charInRange(c, 0x1E00, 0x1E9B) ||
      _charInRange(c, 0x1EA0, 0x1EF9) ||
      _charInRange(c, 0x1F00, 0x1F15) ||
      _charInRange(c, 0x1F18, 0x1F1D) ||
      _charInRange(c, 0x1F20, 0x1F45) ||
      _charInRange(c, 0x1F48, 0x1F4D) ||
      _charInRange(c, 0x1F50, 0x1F57) ||
      c == 0x1F59 ||
      c == 0x1F5B ||
      c == 0x1F5D ||
      _charInRange(c, 0x1F5F, 0x1F7D) ||
      _charInRange(c, 0x1F80, 0x1FB4) ||
      _charInRange(c, 0x1FB6, 0x1FBC) ||
      c == 0x1FBE ||
      _charInRange(c, 0x1FC2, 0x1FC4) ||
      _charInRange(c, 0x1FC6, 0x1FCC) ||
      _charInRange(c, 0x1FD0, 0x1FD3) ||
      _charInRange(c, 0x1FD6, 0x1FDB) ||
      _charInRange(c, 0x1FE0, 0x1FEC) ||
      _charInRange(c, 0x1FF2, 0x1FF4) ||
      _charInRange(c, 0x1FF6, 0x1FFC) ||
      c == 0x2126 ||
      _charInRange(c, 0x212A, 0x212B) ||
      c == 0x212E ||
      _charInRange(c, 0x2180, 0x2182) ||
      _charInRange(c, 0x3041, 0x3094) ||
      _charInRange(c, 0x30A1, 0x30FA) ||
      _charInRange(c, 0x3105, 0x312C) ||
      _charInRange(c, 0xAC00, 0xD7A3);
  }
  
  public static final boolean isIdeographic(char c) {
    return
      _charInRange(c, 0x4E00, 0x9FA5) ||
        c == 0x3007 ||
      _charInRange(c, 0x3021, 0x3029);
  }
  public static final boolean isCombiningChar(char c) {
    return
      _charInRange(c, 0x0300, 0x0345) ||
      _charInRange(c, 0x0360, 0x0361) ||
      _charInRange(c, 0x0483, 0x0486) ||
      _charInRange(c, 0x0591, 0x05A1) ||
      _charInRange(c, 0x05A3, 0x05B9) ||
      _charInRange(c, 0x05BB, 0x05BD) ||
      c == 0x05BF ||
      _charInRange(c, 0x05C1, 0x05C2) ||
      c == 0x05C4 ||
      _charInRange(c, 0x064B, 0x0652) ||
      c == 0x0670 ||
      _charInRange(c, 0x06D6, 0x06DC) ||
      _charInRange(c, 0x06DD, 0x06DF) ||
      _charInRange(c, 0x06E0, 0x06E4) ||
      _charInRange(c, 0x06E7, 0x06E8) ||
      _charInRange(c, 0x06EA, 0x06ED) ||
      _charInRange(c, 0x0901, 0x0903) ||
      c == 0x093C ||
      _charInRange(c, 0x093E, 0x094C) ||
      c == 0x094D ||
      _charInRange(c, 0x0951, 0x0954) ||
      _charInRange(c, 0x0962, 0x0963) ||
      _charInRange(c, 0x0981, 0x0983) ||
      c == 0x09BC ||
      c == 0x09BE ||
      c == 0x09BF ||
      _charInRange(c, 0x09C0, 0x09C4) ||
      _charInRange(c, 0x09C7, 0x09C8) ||
      _charInRange(c, 0x09CB, 0x09CD) ||
      c == 0x09D7 ||
      _charInRange(c, 0x09E2, 0x09E3) ||
      c == 0x0A02 ||
      c == 0x0A3C ||
      c == 0x0A3E ||
      c == 0x0A3F ||
      _charInRange(c, 0x0A40, 0x0A42) ||
      _charInRange(c, 0x0A47, 0x0A48) ||
      _charInRange(c, 0x0A4B, 0x0A4D) ||
      _charInRange(c, 0x0A70, 0x0A71) ||
      _charInRange(c, 0x0A81, 0x0A83) ||
      c == 0x0ABC ||
      _charInRange(c, 0x0ABE, 0x0AC5) ||
      _charInRange(c, 0x0AC7, 0x0AC9) ||
      _charInRange(c, 0x0ACB, 0x0ACD) ||
      _charInRange(c, 0x0B01, 0x0B03) ||
      c == 0x0B3C ||
      _charInRange(c, 0x0B3E, 0x0B43) ||
      _charInRange(c, 0x0B47, 0x0B48) ||
      _charInRange(c, 0x0B4B, 0x0B4D) ||
      _charInRange(c, 0x0B56, 0x0B57) ||
      _charInRange(c, 0x0B82, 0x0B83) ||
      _charInRange(c, 0x0BBE, 0x0BC2) ||
      _charInRange(c, 0x0BC6, 0x0BC8) ||
      _charInRange(c, 0x0BCA, 0x0BCD) ||
      c == 0x0BD7 ||
      _charInRange(c, 0x0C01, 0x0C03) ||
      _charInRange(c, 0x0C3E, 0x0C44) ||
      _charInRange(c, 0x0C46, 0x0C48) ||
      _charInRange(c, 0x0C4A, 0x0C4D) ||
      _charInRange(c, 0x0C55, 0x0C56) ||
      _charInRange(c, 0x0C82, 0x0C83) ||
      _charInRange(c, 0x0CBE, 0x0CC4) ||
      _charInRange(c, 0x0CC6, 0x0CC8) ||
      _charInRange(c, 0x0CCA, 0x0CCD) ||
      _charInRange(c, 0x0CD5, 0x0CD6) ||
      _charInRange(c, 0x0D02, 0x0D03) ||
      _charInRange(c, 0x0D3E, 0x0D43) ||
      _charInRange(c, 0x0D46, 0x0D48) ||
      _charInRange(c, 0x0D4A, 0x0D4D) ||
      c == 0x0D57 ||
      c == 0x0E31 ||
      _charInRange(c, 0x0E34, 0x0E3A) ||
      _charInRange(c, 0x0E47, 0x0E4E) ||
      c == 0x0EB1 ||
      _charInRange(c, 0x0EB4, 0x0EB9) ||
      _charInRange(c, 0x0EBB, 0x0EBC) ||
      _charInRange(c, 0x0EC8, 0x0ECD) ||
      _charInRange(c, 0x0F18, 0x0F19) ||
      c == 0x0F35 ||
      c == 0x0F37 ||
      c == 0x0F39 ||
      c == 0x0F3E ||
      c == 0x0F3F ||
      _charInRange(c, 0x0F71, 0x0F84) ||
      _charInRange(c, 0x0F86, 0x0F8B) ||
      _charInRange(c, 0x0F90, 0x0F95) ||
      c == 0x0F97 ||
      _charInRange(c, 0x0F99, 0x0FAD) ||
      _charInRange(c, 0x0FB1, 0x0FB7) ||
      c == 0x0FB9 ||
      _charInRange(c, 0x20D0, 0x20DC) ||
      c == 0x20E1 ||
      _charInRange(c, 0x302A, 0x302F) ||
      c == 0x3099 ||
      c == 0x309A;
  }
  public static final boolean isDigit(char c) {
    return
      _isAsciiDigit(c) ||
      _isNonAsciiDigit(c);
  }
  private static final boolean _isAsciiDigit(char c) {
    return
      _charInRange(c, 0x0030, 0x0039);
  }
  private static final boolean _isNonAsciiDigit(char c) {
    return
      _charInRange(c, 0x0660, 0x0669) ||
      _charInRange(c, 0x06F0, 0x06F9) ||
      _charInRange(c, 0x0966, 0x096F) ||
      _charInRange(c, 0x09E6, 0x09EF) ||
      _charInRange(c, 0x0A66, 0x0A6F) ||
      _charInRange(c, 0x0AE6, 0x0AEF) ||
      _charInRange(c, 0x0B66, 0x0B6F) ||
      _charInRange(c, 0x0BE7, 0x0BEF) ||
      _charInRange(c, 0x0C66, 0x0C6F) ||
      _charInRange(c, 0x0CE6, 0x0CEF) ||
      _charInRange(c, 0x0D66, 0x0D6F) ||
      _charInRange(c, 0x0E50, 0x0E59) ||
      _charInRange(c, 0x0ED0, 0x0ED9) ||
      _charInRange(c, 0x0F20, 0x0F29);
  }
  public static final boolean isExtender(char c) {
    return
      c == 0x00B7 ||
      c == 0x02D0 ||
      c == 0x02D1 ||
      c == 0x0387 ||
      c == 0x0640 ||
      c == 0x0E46 ||
      c == 0x0EC6 ||
      c == 0x3005 ||
      _charInRange(c, 0x3031, 0x3035) ||
      _charInRange(c, 0x309D, 0x309E) ||
      _charInRange(c, 0x30FC, 0x30FE);
  }
  private static final boolean _charInRange(char c, int start, int end) {
    return c >= start && c <= end;
  }
}





Create Namespace

  
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  private static final String XMLNAMESPACE = "xmlns";
  public static String createNamespace(Element el, String ns) {
    String p = "ns1";
    int i = 1;
    while (getPrefix(el, ns) != null) {
        p = "ns" + i;
        i++;
    }
    el.setAttribute(XMLNAMESPACE + ":" + p, ns);
    return p;
}
  public static String getPrefix(Element el, String ns) {
    NamedNodeMap atts = el.getAttributes();
    for (int i = 0; i < atts.getLength(); i++) {
        Node node = atts.item(i);
        String name = node.getNodeName();
        if (ns.equals(node.getNodeValue())
            && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
            return node.getPrefix();
        }
    }
    return null;
}
}





Creates a QName instance from the given namespace context for the given qualifiedName

  
import javax.xml.namespace.QName;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
public class Utils {
  /**
   * Creates a QName instance from the given namespace context for the given qualifiedName
   *
   * @param element       the element to use as the namespace context
   * @param qualifiedName the fully qualified name
   * @return the QName which matches the qualifiedName
   */
  public static QName createQName(Element element, String qualifiedName) {
      int index = qualifiedName.indexOf(":");
      if (index >= 0) {
          String prefix = qualifiedName.substring(0, index);
          String localName = qualifiedName.substring(index + 1);
          String uri = recursiveGetAttributeValue(element, "xmlns:" + prefix);
          return new QName(uri, localName, prefix);
      } else {
          String uri = recursiveGetAttributeValue(element, "xmlns");
          if (uri != null) {
              return new QName(uri, qualifiedName);
          }
          return new QName(qualifiedName);
      }
  }
  /**
   * Recursive method to find a given attribute value
   */
  public static String recursiveGetAttributeValue(Element element, String attributeName) {
      String answer = null;
      try {
          answer = element.getAttribute(attributeName);
      } catch (Exception e) {
    
      }
      if (answer == null || answer.length() == 0) {
          Node parentNode = element.getParentNode();
          if (parentNode instanceof Element) {
              return recursiveGetAttributeValue((Element) parentNode, attributeName);
          }
      }
      return answer;
  }
}





Get all prefixes defined on this element for the specified namespace.

  
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import java.util.List;
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  private static final String XMLNAMESPACE = "xmlns";
  /**
   * Get all prefixes defined on this element for the specified namespace.
   * 
   * @param element
   * @param namespaceUri
   * @param prefixes
   */
  public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
      NamedNodeMap atts = element.getAttributes();
      for (int i = 0; i < atts.getLength(); i++) {
          Node node = atts.item(i);
          String name = node.getNodeName();
          if (namespaceUri.equals(node.getNodeValue())
              && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
              prefixes.add(node.getPrefix());
          }
      }
  }
}





Get all prefixes defined, up to the root, for a namespace URI.

  
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import java.util.List;
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  private static final String XMLNAMESPACE = "xmlns";
  /**
   * Get all prefixes defined, up to the root, for a namespace URI.
   * 
   * @param element
   * @param namespaceUri
   * @param prefixes
   */
  public static void getPrefixesRecursive(Element element, String namespaceUri, List<String> prefixes) {
      getPrefixes(element, namespaceUri, prefixes);
      Node parent = element.getParentNode();
      if (parent instanceof Element) {
          getPrefixesRecursive((Element)parent, namespaceUri, prefixes);
      }
  }
  /**
   * Get all prefixes defined on this element for the specified namespace.
   * 
   * @param element
   * @param namespaceUri
   * @param prefixes
   */
  public static void getPrefixes(Element element, String namespaceUri, List<String> prefixes) {
      NamedNodeMap atts = element.getAttributes();
      for (int i = 0; i < atts.getLength(); i++) {
          Node node = atts.item(i);
          String name = node.getNodeName();
          if (namespaceUri.equals(node.getNodeValue())
              && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
              prefixes.add(node.getPrefix());
          }
      }
  }
}





Handling namespaces during parsing

     
 
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
class SampleOfNamespacePrefixes extends DefaultHandler {
  private Map namespaceMapping = new HashMap();
  public void startPrefixMapping(String prefix, String uri) throws SAXException {
    namespaceMapping.put(uri, prefix);
  }
  public void endPrefixMapping(String prefix) throws SAXException {
    Iterator i = namespaceMapping.keySet().iterator();
    for (; i.hasNext();) {
      String uri = (String) i.next();
      String uriPrefix = (String) namespaceMapping.get(uri);
      if (prefix.equals(uriPrefix)) {
        namespaceMapping.remove(uri);
        break;
      }
    }
  }
}





Namespace Attribute Event Output

      
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
public class MainClass {
  public static void main(String[] args) throws Exception {
    XMLEventFactory eventFactory = XMLEventFactory.newInstance();
    XMLEventWriter writer = XMLOutputFactory.newInstance().createXMLEventWriter(System.out);
    writer.add(eventFactory.createStartElement("ns1", "http://www.e.ru/ns1", "sample", null,
        null));
    writer.add(eventFactory.createNamespace("ns1", "http://www.e.ru/ns1"));
    writer.add(eventFactory.createNamespace("ns2", "http://www.e.ru/ns2"));
    writer.add(eventFactory.createAttribute("ns2", "http://www.e.ru/ns2", "attribute","true"));
    writer.add(eventFactory.createEndDocument());
    writer.flush();
  }
}





Namespace Attribute Event Output 1

      
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Namespace;
public class MainClass {
  public static void main(String[] args) throws Exception {
    XMLEventFactory eventFactory = XMLEventFactory.newInstance();
    XMLEventWriter writer = XMLOutputFactory.newInstance().createXMLEventWriter(System.out);
    Namespace ns1 = eventFactory.createNamespace("ns1", "http://www.e.ru/ns1");
    Namespace ns2 = eventFactory.createNamespace("ns2", "http://www.e.ru/ns2");
    List<Namespace> namespaceList = new ArrayList<Namespace>();
    namespaceList.add(ns1);
    namespaceList.add(ns2);
    Attribute attribute = eventFactory.createAttribute(ns2.getPrefix(), ns2.getNamespaceURI(),
        "attribute", "true");
    writer.add(eventFactory.createStartElement(ns1.getPrefix(), ns1.getNamespaceURI(), "sample",
        Collections.singletonList(attribute).iterator(), namespaceList.iterator()));
    writer.add(eventFactory.createEndDocument());
    writer.flush();
  }
}





Set a namespace/prefix on an element if it is not set already.

  
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  private static final String XMLNAMESPACE = "xmlns";
  /**
   * Set a namespace/prefix on an element if it is not set already. First off, it searches for the element
   * for the prefix associated with the specified namespace. If the prefix isn"t null, then this is
   * returned. Otherwise, it creates a new attribute using the namespace/prefix passed as parameters.
   * 
   * @param element
   * @param namespace
   * @param prefix
   * @return the prefix associated with the set namespace
   */
  public static String setNamespace(Element element, String namespace, String prefix) {
      String pre = getPrefixRecursive(element, namespace);
      if (pre != null) {
          return pre;
      }
      element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, "xmlns:" + prefix, namespace);
      return prefix;
  }
  public static String getPrefixRecursive(Element el, String ns) {
    String prefix = getPrefix(el, ns);
    if (prefix == null && el.getParentNode() instanceof Element) {
        prefix = getPrefixRecursive((Element)el.getParentNode(), ns);
    }
    return prefix;
  }
  public static String getPrefix(Element el, String ns) {
    NamedNodeMap atts = el.getAttributes();
    for (int i = 0; i < atts.getLength(); i++) {
        Node node = atts.item(i);
        String name = node.getNodeName();
        if (ns.equals(node.getNodeValue())
            && (name != null && (XMLNAMESPACE.equals(name) || name.startsWith(XMLNAMESPACE + ":")))) {
            return node.getPrefix();
        }
    }
    return null;
}
}





Start element with namespace

      
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
public class MainClass{
  public static void main(String[] args) throws XMLStreamException {
    XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
    outputFactory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
    XMLStreamWriter writer = outputFactory.createXMLStreamWriter(System.out);
    writer.writeStartDocument("1.0");
    writer.writeStartElement("http://www.t.ru/f", "sample");
    writer.writeAttribute("attribute", "true");
    writer.writeAttribute("http://www.t.ru/f", "attribute2", "false");
    writer.writeCharacters("some text");
    writer.writeCData("<test>");
    writer.writeEndElement();
    writer.writeEndDocument();
    writer.flush();
  }
}





Starting from a node, find the namespace declaration for a prefix.

  
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import java.util.List;
import javax.xml.XMLConstants;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
 * Few simple utils to read DOM. This is originally from the Jakarta Commons Modeler.
 * 
 * @author Costin Manolache
 */
public class Utils {
  private static final String XMLNAMESPACE = "xmlns";
  /**
   * Starting from a node, find the namespace declaration for a prefix. for a matching namespace
   * declaration.
   * 
   * @param node search up from here to search for namespace definitions
   * @param searchPrefix the prefix we are searching for
   * @return the namespace if found.
   */
  public static String getNamespace(Node node, String searchPrefix) {
      Element el;
      while (!(node instanceof Element)) {
          node = node.getParentNode();
      }
      el = (Element)node;
      NamedNodeMap atts = el.getAttributes();
      for (int i = 0; i < atts.getLength(); i++) {
          Node currentAttribute = atts.item(i);
          String currentLocalName = currentAttribute.getLocalName();
          String currentPrefix = currentAttribute.getPrefix();
          if (searchPrefix.equals(currentLocalName) && XMLNAMESPACE.equals(currentPrefix)) {
              return currentAttribute.getNodeValue();
          } else if (isEmpty(searchPrefix) && XMLNAMESPACE.equals(currentLocalName)
                     && isEmpty(currentPrefix)) {
              return currentAttribute.getNodeValue();
          }
      }
      Node parent = el.getParentNode();
      if (parent instanceof Element) {
          return getNamespace((Element)parent, searchPrefix);
      }
      return null;
  }
  public static boolean isEmpty(String str) {
    return str == null || str.length() == 0;
}
}


Источник — «http://jexp.ru/index.php?title=Java/XML/Namespace&oldid=8732»