Java tutorial
/* * $Date: 2012-06-22 12:23:25 -0700 (Fri, 22 June 2012) $ * $Author: dcosta $ * $Revision: 2145 $ * * 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.IOException; import javax.servlet.RequestDispatcher; 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.log4j.Logger; import edu.lternet.pasta.client.ResultSetUtility; import edu.lternet.pasta.common.EmlPackageId; import edu.lternet.pasta.common.EmlPackageIdFormat; import edu.lternet.pasta.portal.search.Search; import edu.lternet.pasta.portal.user.SavedData; public class SavedDataServlet extends DataPortalServlet { /* * Class variables */ private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.SavedDataServlet.class); private static final long serialVersionUID = 1L; private static String cwd = null; private static String xslpath = null; /* * Instance variables */ /* * Constructors */ /** * Constructor of the object. */ public SavedDataServlet() { super(); } /* * Class methods */ /* * Instance methods */ /** * 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 forward = (String) request.getParameter("forward"); String startStr = (String) request.getParameter("start"); String rowsStr = (String) request.getParameter("rows"); String sort = (String) request.getParameter("sort"); if (sort == null || sort.equals("")) { sort = String.format("%s,%s", Search.PACKAGEID_SORT, Search.SORT_ORDER_ASC); } if (forward == null) forward = "savedData.jsp"; String uid = (String) httpSession.getAttribute("uid"); if (uid == null || uid.isEmpty()) { uid = "public"; } String message = null; if (uid.equals("public")) { message = LOGIN_WARNING; forward = "./login.jsp"; request.setAttribute("message", message); request.setAttribute("from", "savedDataServlet"); } else { String operation = (String) request.getParameter("operation"); // "save" or "unsave" String packageId = (String) request.getParameter("packageId"); SavedData savedData = new SavedData(uid); /* * First, execute any operations that change the state of the saved data */ if (operation != null && packageId != null) { EmlPackageIdFormat emlPackageIdFormat = new EmlPackageIdFormat(); EmlPackageId emlPackageId = emlPackageIdFormat.parse(packageId); String scope = emlPackageId.getScope(); Integer identifier = emlPackageId.getIdentifier(); Integer revision = emlPackageId.getRevision(); if (operation.equals("save")) { savedData.addDocid(scope, identifier, revision); } else if (operation.equals("unsave")) { savedData.removeDocid(scope, identifier); } } /* * If we are forwarding to the saved data page, update the HTML * to be displayed */ if (forward != null && forward.equals("savedData.jsp")) { String html = "<p>There are no data packages on your data shelf.</p>"; String termsListHTML = ""; String xml = null; response.setContentType("text/html"); try { xml = savedData.getSavedDataXML(startStr, rowsStr, sort); if (xml != null) { httpSession.setAttribute("termsListHTML", termsListHTML); boolean isSavedDataPage = true; ResultSetUtility resultSetUtility = new ResultSetUtility(xml, sort, savedData, isSavedDataPage); html = resultSetUtility.xmlToHtmlTable(cwd + xslpath); } request.setAttribute("searchresult", html); } catch (Exception e) { handleDataPortalError(logger, e); } } } /* * Forward to login.jsp or savedData.jsp, but not to other values because * they use AJAX and we don't want a page refresh */ if (forward != null && !forward.equals("") && !forward.equals("savedData") && !forward.equals("simpleSearch")) { RequestDispatcher requestDispatcher = request.getRequestDispatcher(forward); requestDispatcher.forward(request, response); } } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { PropertiesConfiguration options = ConfigurationListener.getOptions(); xslpath = options.getString("resultsetutility.xslpath"); cwd = options.getString("system.cwd"); } }