applyxslt.java

jsp文件上传下载全攻略

    try
    {
      transformer.setParameter("servlet-RemoteUser", new XString(request.getRemoteUser()));
                                      
    }
    catch (Exception e)
    {
    }
  }


  /**
   * Writes the following information to the servlet log:
   * <ol>
   * <li>HTTP status code</li>
   * <li>Message</li>
   * <li>Stack trace</li>
   * </ol>
   * @param axe Contains valid HTTP status code, message, and stack trace (optional)
   */
  protected void writeLog(ApplyXSLTException axe)
  {
    writeLog(axe.getMessage(), axe.getStatusCode(), axe.getException());
  }

  /**
   * Writes the following information to the servlet log:
   * <ol>
   * <li>HTTP status code</li>
   * <li>Message</li>
   * <li>Stack trace</li>
   * </ol>
   * @param msg Message to be logged
   * @param statusCode Valid status code from javax.servlet.http.HttpServletResponse
   * @param t Used to generate stack trace (may be =null to suppress stack trace)
   */
  protected void writeLog(String msg, int statusCode, Throwable t)
  {
    if (t == null)
      writeLog(msg, statusCode);
    else
    {
      ByteArrayOutputStream bytes = new ByteArrayOutputStream();
      PrintWriter writer = new PrintWriter(bytes, true);
      System.out.println("Exception is " + t.getClass().getName());
      t.printStackTrace(writer);
      log("HTTP Status Code: " + statusCode + " - " + msg + EOL + bytes.toString());
    }
  }

  /**
   * Writes the following information to the servlet log:
   * <ol>
   * <li>HTTP status code</li>
   * <li>Message</li>
   * </ol>
   * @param msg Message to be logged
   * @param statusCode Valid status code from javax.servlet.http.HttpServletResponse
   */
  protected void writeLog(String msg, int statusCode)
  {
    log("HTTP Status Code: " + statusCode + " - " + msg);
  }

  /**
   * Invokes response.sendError setting an HTTP status code and optionally an error message
   * as an HTML page.
   * <p>If running in debug mode, also try to return a stack trace of the exception and
   * and xml/xsl processor messages.</p>
   * @param response Where to stream the exception to
   * @param xse The wrapper which contains the exception and its HTTP status code
   * @param debug Indicates whether to include stack trace, etc.
   */
  protected void displayException(HttpServletResponse response, ApplyXSLTException xse, boolean debug)
  {
    String mesg = xse.getMessage();
    if (mesg == null)
      mesg = "";
    else mesg = "<B>" + mesg + "</B>";
    StringTokenizer tokens = new StringTokenizer(mesg, EOL);
    StringBuffer strBuf = new StringBuffer();
    while (tokens.hasMoreTokens())
      strBuf.append(tokens.nextToken() + EOL + "<BR>");
    mesg = strBuf.toString();
    if (debug)
    {
      ByteArrayOutputStream bytes = new ByteArrayOutputStream();
      PrintWriter writer = new PrintWriter(bytes, true);
      xse.getException().printStackTrace(writer);
      mesg += " <PRE> " + bytes.toString() + " </PRE> ";
    }
    response.setContentType("text/html");
    try
    {
      response.sendError(xse.getStatusCode(), mesg);
    }
    catch (IOException ioe)
    {
      System.err.println("IOException is occurring when sendError is called");
    }
  }

  /**
   * Mapping of HTTP request's user-Agent values to stylesheet media= values.
   * <p>This mapping is defined by a file pointed to by the operational parameter "mediaURL" which can
   *  either contain a full URL or a path relative to the System's server.root /servlets directory.</p>
   * @see #setMediaProps
   * @see #getMedia
   * @serial
   */
  protected OrderedProps ourMediaProps = null;

  /**
   * Returns a connection which respects the Accept-Language header of the HTTP request.  This
   * is useful when XSL files are internationalized for use with Web servers which respect this
   * header.
   * <p>For example, Apache 1.3.6 may be configured for multiviews.  Under this configuration,
   * requests for http://myhost/index.html would return http://myhost/index.html.fr to French browsers
   * and http://myhost/index.html.en to English browsers.</p>
   * @param url Location to connect to
   * @param request Could contain an Accept-Language header
   * @return An Accept-Language-enabled URL connection
   * @see #getStylesheet
   */
  protected URLConnection toAcceptLanguageConnection(URL url, HttpServletRequest request)
    throws Exception
  {
    URLConnection tempConnection = url.openConnection();
    tempConnection.setRequestProperty("Accept-Language", request.getHeader("Accept-Language"));
    return tempConnection;
  }


  /**
   * Returns the XSL stylesheet URL associated with the specified XML document.  If multiple XSL
   * stylesheets are associated with the XML document, preference will be given to the stylesheet
   * which contains an attribute name/value pair that corresponds to the specified attributeName
   * and attributeValue.
   * @param xmlSource XML XSLTInputSource to be searched for associated XSL stylesheets
   * @param attributeName  Attribute name to provide preferential matching
   * @param attributeValue Attribute value to provide preferential matching
   * @return The preferred XSL stylesheet URL, or null if no XSL stylesheet association is found
   * @see #getStylesheet
   */
  public static String getXSLURLfromDoc(StreamSource xmlSource,
                                        String attributeName,
                                        String attributeValue,
                                        TransformerFactory tFactory)
  {
    String tempURL = null, returnURL = null;
    try
    {
	  DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
      DocumentBuilder docBuilder = dfactory.newDocumentBuilder();
      Node sourceTree = docBuilder.parse(xmlSource.getInputStream());
      for(Node child=sourceTree.getFirstChild(); null != child; child=child.getNextSibling())
      {
        if(Node.PROCESSING_INSTRUCTION_NODE == child.getNodeType())
        {
          ProcessingInstruction pi = (ProcessingInstruction)child;
          if(pi.getNodeName().equals("xml-stylesheet"))
          {
            PIA pia = new PIA(pi);
            if("text/xsl".equals(pia.getAttribute("type")))
            {
              tempURL = pia.getAttribute("href");
              String attribute = pia.getAttribute(attributeName);
              if ((attribute != null) && (attribute.indexOf(attributeValue) > -1))
                return tempURL;
              if (!"yes".equals(pia.getAttribute("alternate")))
                returnURL = tempURL;
            }
          }
        }
      }
    }
    catch(Exception saxExc)
    {
    }
    return returnURL;
  }  

 /**
   * The attribute name in the <?xml-stylesheet> tag used in stylesheet selection.
   */
  protected static final String STYLESHEET_ATTRIBUTE = "media";

  /**
   *	The HTTP Header used for matching the Stylesheet attribute via the
   * media properties file selected.
   */
  protected static final String HEADER_NAME = "user-Agent";
}

/**
 *  Stores the keys and values from a file (similar to a properties file) and
 *  can return the first value which has a key contained in its string.
 *  File can have comment lines starting with '#" and for each line the entries are
 *  separated by tabs and '=' char.
 */
class OrderedProps
{

  /**
   * Stores the Key and Values as an array of Strings
   */
  private Vector attVec = new Vector(15);

  /**
   * Constructor.
   * @param inputStream Stream containing the properties file.
   * @exception IOException Thrown if unable to read from stream
   */
  OrderedProps(InputStream inputStream)
    throws IOException
  {
    BufferedReader input  = new BufferedReader(new InputStreamReader(inputStream));
    String currentLine, Key = null;
    StringTokenizer currentTokens;
    while ((currentLine = input.readLine()) != null)
    {
      currentTokens = new StringTokenizer(currentLine, "=\t\r\n");
      if (currentTokens.hasMoreTokens()) Key = currentTokens.nextToken().trim();
      if ((Key != null) && !Key.startsWith("#") && currentTokens.hasMoreTokens())
      {
        String temp[] = new String[2];
        temp[0] = Key; temp[1] = currentTokens.nextToken().trim();
        attVec.addElement(temp);
      }
    }
  }

  /**
   * Iterates through the Key list and returns the first value for whose
   * key the given string contains.  Returns "unknown" if no key is contained
   * in the string.
   * @param s String being searched for a key.
   * @return Value for key found in string, otherwise "unknown"
   */
  String getValue(String s)
  {
    int i, j = attVec.size();
    for (i = 0; i < j; i++)
    {
      String temp[] = (String[]) attVec.elementAt(i);
      if (s.indexOf(temp[0]) > -1)
        return temp[1];
    }
    return "unknown";
  }
}

/**
 * Parses a processing instruction's (PI) attributes for easy retrieval.
 */
class PIA
{

  private Hashtable piAttributes = null;

  /**
   * Constructor.
   * @param pi The processing instruction whose attributes are to be parsed
   */
  PIA(ProcessingInstruction pi)
  {
    piAttributes = new Hashtable();
    StringTokenizer tokenizer = new StringTokenizer(pi.getNodeValue(), "=\"");
    while(tokenizer.hasMoreTokens())
    {
      piAttributes.put(tokenizer.nextToken().trim(), tokenizer.nextToken().trim());
    }
  }

  /**
   * Returns value of specified attribute.
   *  @param name Attribute name
   *  @return Attribute value, or null if the attribute name does not exist
   */
  String getAttribute(String name)
  {
    return (String) piAttributes.get(name);
  }  
}