/*************************************************************************
*
* $RCSfile: ConverterServlet.java,v $
*
* $Revision: 1.6 $
*
* last change: $Author: hr $ $Date: 2003/06/30 15:53:49 $
*
* The Contents of this file are made available subject to the terms of
* the BSD license.
*
* Copyright (c) 2003 by Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*************************************************************************/
// JDK API
import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.BufferedInputStream;
import java.util.Enumeration;
// Servlet API
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletOutputStream;
// Helper API
import com.oreilly.servlet.MultipartRequest;
import com.oreilly.servlet.MultipartResponse;
import com.oreilly.servlet.ServletUtils;
// UNO API
import com.sun.star.bridge.XUnoUrlResolver;
import com.sun.star.uno.XComponentContext;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.frame.XComponentLoader;
import com.sun.star.frame.XStorable;
import com.sun.star.beans.PropertyValue;
import com.sun.star.beans.XPropertySet;
import com.sun.star.lang.XComponent;
import com.sun.star.lang.XMultiComponentFactory;
/** This class implements a http servlet in order to convert an incoming document
* with help of a running OpenOffice.org and to push the converted file back
* to the client.
*/
public class ConverterServlet extends HttpServlet {
/** Specifies the temporary directory on the web server.
*/
private String stringWorkingDirectory =
System.getProperty( "java.io.tmpdir" ).replace( '\\', '/' );
/** Specifies the host for the office server.
*/
private String stringHost = "localhost";
/** Specifies the port for the office server.
*/
private String stringPort = "8100";
/** Called by the server (via the service method) to allow a servlet to handle
* a POST request. The file from the client will be uploaded to the web server
* and converted on the web server and after all pushed to the client.
* @param request Object that contains the request the client has made of the servlet.
* @param response Object that contains the response the servlet sends to the client.
* @throws ServletException If the request for the POST could not be handled.
* @throws IOException If an input or output error is detected when the servlet handles the request.
*/
protected void doPost( HttpServletRequest request,
HttpServletResponse response) throws ServletException, java.io.IOException {
try {
// If necessary, add a slash to the end of the string.
if ( !stringWorkingDirectory.endsWith( "/" ) ) {
stringWorkingDirectory += "/";
}
// Construct a MultipartRequest to help read the information.
// Pass in the request, a directory to save files to, and the
// maximum POST size we should attempt to handle.
MultipartRequest multipartrequest =
new MultipartRequest( request, stringWorkingDirectory, 5 * 1024 * 1024 );
// Getting all file names from the request
Enumeration files = multipartrequest.getFileNames();
// Every received file will be converted to the specified type
while (files.hasMoreElements()) {
// Getting the name from the element
String stringName = (String)files.nextElement();
// Getting the filename from the request
String stringFilename =
multipartrequest.getFilesystemName( stringName );
// Converting the given file on the server to the specified type and
// append a special extension
String stringConvertedFile = this.convertDocument(
stringWorkingDirectory + stringFilename,
multipartrequest.getParameter( "converttype" ),
multipartrequest.getParameter( "extension" ) );
// Constructing the multi part response to the client
MultipartResponse multipartresponse = new MultipartResponse(
response );
// Is the convert type HTML?
if ( ( multipartrequest.getParameter( "converttype" ).equals(
"swriter: HTML (StarWriter)" ) )
|| ( multipartrequest.getParameter( "converttype" ).equals(
"scalc: HTML (StarCalc)" ) ) ) {
// Setting the content type of the response being sent to the client
// to text
multipartresponse.startResponse( "text/html" );
} else {
// Setting the content type of the response being sent to the client
// to application/octet-stream so that file will open a dialog box
// at the client in order to save the converted file
multipartresponse.startResponse( "application/octet-stream" );
}
// Pushing the converted file to the client
ServletUtils.returnFile( stringConvertedFile,
response.getOutputStream() );
// Finishing the multi part response
multipartresponse.finish();
}
}
catch (Exception exception) {
System.err.println( exception.toString() );
}
}
/** This method converts a document to a given type by using a running
* OpenOffice.org and saves the converted document to the specified
* working directory.
* @param stringDocumentName The full path name of the file on the server to be converted.
* @param stringConvertType Type to convert to.
* @param stringExtension This string will be appended to the file name of the converted file.
* @return The full path name of the converted file will be returned.
* @see stringWorkingDirectory
*/
private String convertDocument( String stringDocumentName,
String stringConvertType, String stringExtension ) {
String stringConvertedFile = "";
// Converting the document to the favoured type
try {
// Composing the URL
String stringUrl = "file:///" + stringDocumentName;
/* Bootstraps a component context with the jurt base components
registered. Component context to be granted to a component for running.
Arbitrary values can be retrieved from the context. */
XComponentContext xcomponentcontext =
com.sun.star.comp.helper.Bootstrap.createInitialComponentContext( null );
/* Gets the service manager instance to be used (or null). This method has
been added for convenience, because the service manager is a often used
object. */
XMultiComponentFactory xmulticomponentfactory =
xcomponentcontext.getServiceManager();
/* Creates an instance of the component UnoUrlResolver which
supports the services specified by the factory. */
Object objectUrlResolver =
xmulticomponentfactory.createInstanceWithContext(
"com.sun.star.bridge.UnoUrlResolver", xcomponentcontext );
// Create a new url resolver
XUnoUrlResolver xurlresolver = ( XUnoUrlResolver )
UnoRuntime.queryInterface( XUnoUrlResolver.class,
objectUrlResolver );
// Resolves an object that is specified as follow:
// uno:<connection description>;<protocol description>;<initial object name>
Object objectInitial = xurlresolver.resolve(
"uno:socket,host=" + stringHost + ",port=" + stringPort + ";urp;StarOffice.ServiceManager" );
// Create a service manager from the initial object
xmulticomponentfactory = ( XMultiComponentFactory )
UnoRuntime.queryInterface( XMultiComponentFactory.class, objectInitial );
// Query for the XPropertySet interface.
XPropertySet xpropertysetMultiComponentFactory = ( XPropertySet )
UnoRuntime.queryInterface( XPropertySet.class, xmulticomponentfactory );
// Get the default context from the office server.
Object objectDefaultContext =
xpropertysetMultiComponentFactory.getPropertyValue( "DefaultContext" );
// Query for the interface XComponentContext.
xcomponentcontext = ( XComponentContext ) UnoRuntime.queryInterface(
XComponentContext.class, objectDefaultContext );
/* A desktop environment contains tasks with one or more
frames in which components can be loaded. Desktop is the
environment for components which can instanciate within
frames. */
XComponentLoader xcomponentloader = ( XComponentLoader )
UnoRuntime.queryInterface( XComponentLoader.class,
xmulticomponentfactory.createInstanceWithContext(
"com.sun.star.frame.Desktop", xcomponentcontext ) );
// Preparing properties for loading the document
PropertyValue propertyvalue[] = new PropertyValue[ 1 ];
// Setting the flag for hidding the open document
propertyvalue[ 0 ] = new PropertyValue();
propertyvalue[ 0 ].Name = "Hidden";
propertyvalue[ 0 ].Value = new Boolean(true);
// Loading the wanted document
Object objectDocumentToStore =
xcomponentloader.loadComponentFromURL(
stringUrl, "_blank", 0, propertyvalue );
// Getting an object that will offer a simple way to store a document to a URL.
XStorable xstorable =
( XStorable ) UnoRuntime.queryInterface( XStorable.class,
objectDocumentToStore );
// Preparing properties for converting the document
propertyvalue = new PropertyValue[ 2 ];
// Setting the flag for overwriting
propertyvalue[ 0 ] = new PropertyValue();
propertyvalue[ 0 ].Name = "Overwrite";
propertyvalue[ 0 ].Value = new Boolean(true);
// Setting the filter name
propertyvalue[ 1 ] = new PropertyValue();
propertyvalue[ 1 ].Name = "FilterName";
propertyvalue[ 1 ].Value = stringConvertType;
// Appending the favoured extension to the origin document name
stringConvertedFile = stringUrl + "." + stringExtension;
// Storing and converting the document
xstorable.storeAsURL( stringConvertedFile, propertyvalue );
// Getting the method dispose() for closing the document
XComponent xcomponent =
( XComponent ) UnoRuntime.queryInterface( XComponent.class,
xstorable );
// Closing the converted document
xcomponent.dispose();
}
catch( Exception exception ) {
exception.printStackTrace();
return( "" );
}
if ( stringConvertedFile.startsWith( "file:///" ) ) {
// Truncating the beginning of the file name
stringConvertedFile = stringConvertedFile.substring( 8 );
}
// Returning the name of the converted file
return( stringConvertedFile );
}
}