Java tutorial
/********************************************************************************* * Ephesoft is a Intelligent Document Capture and Mailroom Automation program * developed by Ephesoft, Inc. Copyright (C) 2015 Ephesoft Inc. * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU Affero General Public License version 3 as published by the * Free Software Foundation with the addition of the following permission added * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK * IN WHICH THE COPYRIGHT IS OWNED BY EPHESOFT, EPHESOFT DISCLAIMS THE WARRANTY * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. * * 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 Affero General Public License for more * details. * * You should have received a copy of the GNU Affero General Public License along with * this program; if not, see http://www.gnu.org/licenses or write to the Free * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA. * * You can contact Ephesoft, Inc. headquarters at 111 Academy Way, * Irvine, CA 92617, USA. or at email address info@ephesoft.com. * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License version 3. * * In accordance with Section 7(b) of the GNU Affero General Public License version 3, * these Appropriate Legal Notices must retain the display of the "Ephesoft" logo. * If the display of the logo is not reasonably feasible for * technical reasons, the Appropriate Legal Notices must display the words * "Powered by Ephesoft". ********************************************************************************/ package com.ephesoft.gxt.foldermanager.server; import java.io.DataInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.util.List; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.ephesoft.gxt.foldermanager.client.i18n.FolderManagementConstants; public class UploadDownloadFilesServlet extends HttpServlet { private static final long serialVersionUID = -7306215716570055774L; private static final Logger LOGGER = LoggerFactory.getLogger(UploadDownloadFilesServlet.class); @Override public final void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { doPost(request, response); } @Override public void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException { String currentUploadFolderName = req.getParameter(FolderManagementConstants.CURRENT_UPLOAD_FOLDER_NAME); if (null != currentUploadFolderName) { uploadFile(req, resp, currentUploadFolderName); } else { String currentFileDownloadPath = req.getParameter(FolderManagementConstants.CURRENT_FILE_DOWNLOAD_PATH); if (null != currentFileDownloadPath) { downloadFile(req, resp, currentFileDownloadPath); } } } private void downloadFile(HttpServletRequest req, HttpServletResponse response, String currentFileDownloadPath) { DataInputStream in = null; ServletOutputStream outStream = null; try { outStream = response.getOutputStream(); File file = new File(currentFileDownloadPath); int length = 0; String mimetype = "application/octet-stream"; response.setContentType(mimetype); response.setContentLength((int) file.length()); String fileName = file.getName(); response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); byte[] byteBuffer = new byte[1024]; in = new DataInputStream(new FileInputStream(file)); while ((in != null) && ((length = in.read(byteBuffer)) != -1)) { outStream.write(byteBuffer, 0, length); } } catch (IOException e) { } finally { if (in != null) { try { in.close(); } catch (IOException e) { } } if (outStream != null) { try { outStream.flush(); } catch (IOException e) { } try { outStream.close(); } catch (IOException e) { } } } } private void uploadFile(HttpServletRequest req, HttpServletResponse resp, String currentBatchUploadFolderName) throws IOException { PrintWriter printWriter = resp.getWriter(); File tempFile = null; InputStream instream = null; OutputStream out = null; String uploadFileName = ""; try { if (ServletFileUpload.isMultipartContent(req)) { FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); uploadFileName = ""; String uploadFilePath = ""; List<FileItem> items; try { items = upload.parseRequest(req); for (FileItem item : items) { if (!item.isFormField()) { uploadFileName = item.getName(); if (uploadFileName != null) { uploadFileName = uploadFileName .substring(uploadFileName.lastIndexOf(File.separator) + 1); } uploadFilePath = currentBatchUploadFolderName + File.separator + uploadFileName; try { instream = item.getInputStream(); tempFile = new File(uploadFilePath); out = new FileOutputStream(tempFile); byte buf[] = new byte[1024]; int len; while ((len = instream.read(buf)) > 0) { out.write(buf, 0, len); } } catch (FileNotFoundException e) { printWriter.write("Unable to create the upload folder.Please try again."); } catch (IOException e) { printWriter.write("Unable to read the file.Please try again."); } finally { if (out != null) { out.close(); } if (instream != null) { instream.close(); } } } } } catch (FileUploadException e) { printWriter.write("Unable to read the form contents.Please try again."); } } else { printWriter.write("Request contents type is not supported."); } printWriter.write("currentBatchUploadFolderName:" + currentBatchUploadFolderName); printWriter.append("|"); printWriter.append("fileName:").append(uploadFileName); printWriter.append("|"); } finally { printWriter.flush(); printWriter.close(); } } }