examples.java

jsp文件上传下载全攻略

      {
        DocumentBuilderFactory dfactory =
          DocumentBuilderFactory.newInstance();
        dfactory.setNamespaceAware(true);
        DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
        org.w3c.dom.Document outNode = docBuilder.newDocument();
        Node doc = docBuilder.parse(new InputSource(xslID));
 
        DOMSource dsource = new DOMSource(doc);
        // If we don't do this, the transformer won't know how to 
        // resolve relative URLs in the stylesheet.
        dsource.setSystemId(xslID);

        templates = tfactory.newTemplates(dsource);
      }

      Transformer transformer = templates.newTransformer();
      DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
      // Note you must always setNamespaceAware when building .xsl stylesheets
      dfactory.setNamespaceAware(true);
      DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
      org.w3c.dom.Document outNode = docBuilder.newDocument();
      Node doc = docBuilder.parse(new InputSource(sourceID));

      transformer.transform(new DOMSource(doc), new DOMResult(outNode));
      
      Transformer serializer = tfactory.newTransformer();
      serializer.transform(new DOMSource(outNode), new StreamResult(new OutputStreamWriter(System.out)));

      return outNode;
    }
    else
    {
      throw new org.xml.sax
        .SAXNotSupportedException("DOM node processing not supported!");
    }
  } 

  /**
   * This shows how to set a parameter for use by the templates. Use 
   * two transformers to show that different parameters may be set 
   * on different transformers.
   */
  public static void exampleParam(String sourceID, 
                                  String xslID)
    throws TransformerException, TransformerConfigurationException
  {
    TransformerFactory tfactory = TransformerFactory.newInstance();
    Templates templates = tfactory.newTemplates(new StreamSource(xslID));
    Transformer transformer1 = templates.newTransformer();
    Transformer transformer2 = templates.newTransformer();

    transformer1.setParameter("a-param",
                              "hello to you!");
    transformer1.transform(new StreamSource(sourceID),
                           new StreamResult(new OutputStreamWriter(System.out)));
    
    System.out.println("\n=========");
    
    transformer2.setOutputProperty(OutputKeys.INDENT, "yes");
    transformer2.transform(new StreamSource(sourceID),
                           new StreamResult(new OutputStreamWriter(System.out)));
  }
  
  /**
   * Show the that a transformer can be reused, and show resetting 
   * a parameter on the transformer.
   */
  public static void exampleTransformerReuse(String sourceID, String xslID)
    throws TransformerException, TransformerConfigurationException
  {
    // Create a transform factory instance.
    TransformerFactory tfactory = TransformerFactory.newInstance();
    
    // Create a transformer for the stylesheet.
    Transformer transformer 
      = tfactory.newTransformer(new StreamSource(xslID));
    
    transformer.setParameter("a-param",
                              "hello to you!");
    
    // Transform the source XML to System.out.
    transformer.transform( new StreamSource(sourceID),
                           new StreamResult(new OutputStreamWriter(System.out)));

    System.out.println("\n=========\n");

    transformer.setParameter("a-param",
                              "hello to me!");
    transformer.setOutputProperty(OutputKeys.INDENT, "yes");

    // Transform the source XML to System.out.
    transformer.transform( new StreamSource(sourceID),
                           new StreamResult(new OutputStreamWriter(System.out)));
  }

  /**
   * Show how to override output properties.
   */
  public static void exampleOutputProperties(String sourceID, String xslID)
    throws TransformerException, TransformerConfigurationException
  {

    TransformerFactory tfactory = TransformerFactory.newInstance();
    Templates templates = tfactory.newTemplates(new StreamSource(xslID));
    Properties oprops = templates.getOutputProperties();

    oprops.put(OutputKeys.INDENT, "yes");

    Transformer transformer = templates.newTransformer();

    transformer.setOutputProperties(oprops);
    transformer.transform(new StreamSource(sourceID),
                          new StreamResult(new OutputStreamWriter(System.out)));
  }

  /**
   * Show how to get stylesheets that are associated with a given
   * xml document via the xml-stylesheet PI (see http://www.w3.org/TR/xml-stylesheet/).
   */
  public static void exampleUseAssociated(String sourceID)
    throws TransformerException, TransformerConfigurationException
  {
    TransformerFactory tfactory = TransformerFactory.newInstance();

    // The DOM tfactory will have it's own way, based on DOM2, 
    // of getting associated stylesheets.
    if (tfactory instanceof SAXTransformerFactory)
    {
      SAXTransformerFactory stf = ((SAXTransformerFactory) tfactory);
      Source sources =
        stf.getAssociatedStylesheet(new StreamSource(sourceID),
          null, null, null);

      if(null != sources)
      {
        Transformer transformer = tfactory.newTransformer(sources);

        transformer.transform(new StreamSource(sourceID),
                              new StreamResult(new OutputStreamWriter(System.out)));
      }
      else
      {
        System.out.println("Can't find the associated stylesheet!");
      }
    }
  }
  
  /**
   * Show the Transformer using SAX events in and DOM nodes out.
   */
  public static void exampleContentHandler2DOM(String sourceID, String xslID)
          throws TransformerException, TransformerConfigurationException, SAXException, IOException, ParserConfigurationException
  {
    TransformerFactory tfactory = TransformerFactory.newInstance();

    // Make sure the transformer factory we obtained supports both
    // DOM and SAX.
    if (tfactory.getFeature(SAXSource.FEATURE)
        && tfactory.getFeature(DOMSource.FEATURE))
    {
      // We can now safely cast to a SAXTransformerFactory.
      SAXTransformerFactory sfactory = (SAXTransformerFactory) tfactory;
      
      // Create an Document node as the root for the output.
      DocumentBuilderFactory dfactory 
        = DocumentBuilderFactory.newInstance();
      DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
      org.w3c.dom.Document outNode = docBuilder.newDocument();
      
      // Create a ContentHandler that can liston to SAX events 
      // and transform the output to DOM nodes.
      TransformerHandler handler 
        = sfactory.newTransformerHandler(new StreamSource(xslID));
      handler.setResult(new DOMResult(outNode));
      
      // Create a reader and set it's ContentHandler to be the 
      // transformer.
      XMLReader reader=null;

      // Use JAXP1.1 ( if possible )
      try {
	  javax.xml.parsers.SAXParserFactory factory=
	      javax.xml.parsers.SAXParserFactory.newInstance();
	  factory.setNamespaceAware( true );
	  javax.xml.parsers.SAXParser jaxpParser=
	      factory.newSAXParser();
	  reader=jaxpParser.getXMLReader();
	  
      } catch( javax.xml.parsers.ParserConfigurationException ex ) {
	  throw new org.xml.sax.SAXException( ex );
      } catch( javax.xml.parsers.FactoryConfigurationError ex1 ) {
	  throw new org.xml.sax.SAXException( ex1.toString() );
      } catch( NoSuchMethodError ex2 ) {
      }
      if( reader==null ) reader= XMLReaderFactory.createXMLReader();
      reader.setContentHandler(handler);
      reader.setProperty("http://xml.org/sax/properties/lexical-handler",
                         handler);
      
      // Send the SAX events from the parser to the transformer,
      // and thus to the DOM tree.
      reader.parse(sourceID);
      
      // Serialize the node for diagnosis.
      exampleSerializeNode(outNode);
    }
    else
    {
      System.out.println(
        "Can't do exampleContentHandlerToContentHandler because tfactory is not a SAXTransformerFactory");
    }
  }
  
  /**
   * Serialize a node to System.out.
   */
  public static void exampleSerializeNode(Node node)
    throws TransformerException, TransformerConfigurationException, SAXException, IOException,
    ParserConfigurationException
  {
    TransformerFactory tfactory = TransformerFactory.newInstance(); 
    
    // This creates a transformer that does a simple identity transform, 
    // and thus can be used for all intents and purposes as a serializer.
    Transformer serializer = tfactory.newTransformer();
    
    serializer.setOutputProperty(OutputKeys.INDENT, "yes");
    serializer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
    serializer.transform(new DOMSource(node), 
                         new StreamResult(new OutputStreamWriter(System.out)));
  }  
  
  /**
   * A fuller example showing how the TrAX interface can be used 
   * to serialize a DOM tree.
   */
  public static void exampleAsSerializer(String sourceID, String xslID)
    throws TransformerException, TransformerConfigurationException, SAXException, IOException,
    ParserConfigurationException
  {
    DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
    org.w3c.dom.Document outNode = docBuilder.newDocument();
    Node doc = docBuilder.parse(new InputSource(sourceID));

    TransformerFactory tfactory = TransformerFactory.newInstance(); 
    
    // This creates a transformer that does a simple identity transform, 
    // and thus can be used for all intents and purposes as a serializer.
    Transformer serializer = tfactory.newTransformer();
    
    Properties oprops = new Properties();
    oprops.put("method", "html");
    serializer.setOutputProperties(oprops);
    serializer.transform(new DOMSource(doc), 
                         new StreamResult(new OutputStreamWriter(System.out)));
  }
  

  private static void  handleException( Exception ex ) {
    System.out.println("EXCEPTION: " );
    ex.printStackTrace();
    
    if( ex instanceof TransformerConfigurationException ) {
      System.out.println();
      System.out.println("Internal exception: " );
      Throwable ex1=((TransformerConfigurationException)ex).getException();
      ex1.printStackTrace();

      if( ex1 instanceof SAXException ) {
	  Exception ex2=((SAXException)ex1).getException();
	  System.out.println("Internal sub-exception: " );
	  ex2.printStackTrace();
      }
    }
  }

}