Java tutorial
/* * * $Date$ * $Author$ * $Revision$ * * Copyright 2011,2012 the University of New Mexico. * * This work was supported by National Science Foundation Cooperative * Agreements #DEB-0832652 and #DEB-0936498. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0. * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific * language governing permissions and limitations under the License. * */ package edu.lternet.pasta.portal; import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.util.Iterator; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.configuration.PropertiesConfiguration; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.log4j.Logger; import edu.lternet.pasta.client.DataPackageManagerClient; import edu.lternet.pasta.client.ReportUtility; import edu.lternet.pasta.common.UserErrorException; public class UploadEvaluateServlet extends DataPortalServlet { /** * Class variables */ private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.UploadEvaluateServlet.class); private static final long serialVersionUID = 1L; private static String cwd = null; private static String xslpath = null; private static final String HTMLHEAD = "<html lang=\"en\">\n" + "<head>\n" + " <title>LTER :: Network Data Portal</title>\n" + CSS_LINK_ELEMENTS + "</head>\n\n" + "<body>\n" + " <div class=\"body\">\n"; private static final String HTMLTAIL = " </div>\n</body>\n</html>\n"; /** * Constructor of the object. */ public UploadEvaluateServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession httpSession = request.getSession(); String uid = (String) httpSession.getAttribute("uid"); if (uid == null || uid.isEmpty()) uid = "public"; String html = null; boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (isMultipart) { // Create a factory for disk-based file items FileItemFactory factory = new DiskFileItemFactory(); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // Parse the request try { List /* FileItem */ items = upload.parseRequest(request); // Process the uploaded items Iterator iter = items.iterator(); while (iter.hasNext()) { FileItem item = (FileItem) iter.next(); if (!(item.isFormField())) { File eml = processUploadedFile(item); DataPackageManagerClient dpmClient = new DataPackageManagerClient(uid); String xml = dpmClient.evaluateDataPackage(eml); ReportUtility qrUtility = new ReportUtility(xml); String htmlTable = qrUtility.xmlToHtmlTable(cwd + xslpath); if (htmlTable == null) { String msg = "The uploaded file could not be evaluated."; throw new UserErrorException(msg); } else { html = HTMLHEAD + "<div class=\"qualityreport\">" + htmlTable + "</div>" + HTMLTAIL; } } } } catch (Exception e) { handleDataPortalError(logger, e); } } response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.print(html); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { PropertiesConfiguration options = ConfigurationListener.getOptions(); xslpath = options.getString("reportutility.xslpath"); cwd = options.getString("system.cwd"); } /** * Process the uploaded file * * @param item The multipart form file data. * * @return The uploaded file as File object. * * @throws Exception */ private File processUploadedFile(FileItem item) throws Exception { File eml = null; // Process a file upload if (!item.isFormField()) { // Get object information String fieldName = item.getFieldName(); String fileName = item.getName(); String contentType = item.getContentType(); boolean isInMemory = item.isInMemory(); long sizeInBytes = item.getSize(); String tmpdir = System.getProperty("java.io.tmpdir"); logger.debug("FILE: " + tmpdir + "/" + fileName); eml = new File(tmpdir + "/" + fileName); item.write(eml); } return eml; } }