Java tutorial
package org.jolokia.osgish.upload; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.osgi.service.log.LogService; import org.osgi.util.tracker.ServiceTracker; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.*; /* * osgish - An OSGi Shell * * Copyright (C) 2009 Roland Hu, roland@cpan.org * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * A commercial license is available as well. Please contact roland@cpan.org for * further details. */ /** * Servlet used for uploading bundles * * @author roland * @since Jan 26, 2010 */ public class UploadServlet extends HttpServlet { // for logging. It is supposed to be open and managed outside private ServiceTracker logTracker; // Directory where to upload private File uploadDirectory; public UploadServlet(ServiceTracker pLogTracker, File pDataDir) { logTracker = pLogTracker; uploadDirectory = pDataDir; } @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { throw new ServletException("GET is not supported for file upload"); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (!ServletFileUpload.isMultipartContent(request)) { throw new ServletException("Request has no multipart content"); } // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(); // Parse the request FileItemIterator iter; try { iter = upload.getItemIterator(request); while (iter.hasNext()) { FileItemStream item = iter.next(); InputStream in = item.openStream(); if (item.isFormField()) { throw new ServletException("A Form field is not expected here"); } else { File dest = new File(uploadDirectory, item.getName()); try { OutputStream out = new FileOutputStream(dest); copy(in, out); LogService log = (LogService) logTracker.getService(); if (log != null) { log.log(LogService.LOG_INFO, "Uploaded " + dest.getName() + " (size: " + dest.length() + ")"); } // TODO: Return internal location/url of this bundle } catch (IOException exp) { throw new ServletException( "Cannot copy uploaded file to " + dest.getAbsolutePath() + ": " + exp, exp); } } } } catch (FileUploadException e) { throw new ServletException("Upload failed: " + e, e); } response.setStatus(HttpServletResponse.SC_OK); } // Copy input stream in output directory private void copy(InputStream in, OutputStream out) throws IOException { try { byte[] buffer = new byte[4096]; int bytesRead; while ((bytesRead = in.read(buffer)) != -1) { out.write(buffer, 0, bytesRead); } out.flush(); } finally { try { in.close(); } catch (IOException ex) { } try { out.close(); } catch (IOException ex) { } } } /** * Get the upload alias based on the already install j4p alias * * @param pServletAlias j4p servlet alias * @return alias with suffix for how his servlet needs to be registered. */ public String getServletAlias(String pServletAlias) { return pServletAlias + "-upload"; } }