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.File; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletContext; 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.portal.search.BrowseGroup; import edu.lternet.pasta.portal.search.BrowseTerm; import edu.lternet.pasta.portal.search.BrowseSearch; import edu.lternet.pasta.portal.search.Search; import edu.lternet.pasta.portal.search.TermsList; import edu.lternet.pasta.portal.user.SavedData; public class BrowseServlet extends DataPortalServlet { /* * Class variables */ private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.BrowseServlet.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 BrowseServlet() { 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 { String forward = "./searchResult.jsp"; String html = null; TermsList termsList = null; String termsListHTML = ""; String xml = null; HttpSession httpSession = request.getSession(); String uid = (String) httpSession.getAttribute("uid"); if (uid == null || uid.isEmpty()) { uid = "public"; } String searchValue = request.getParameter("searchValue"); BrowseTerm browseTerm = new BrowseTerm(searchValue); // Tell the web server that the response is HTML response.setContentType("text/html"); try { xml = browseTerm.runQuery(); termsList = browseTerm.getTermsList(); if (termsList != null) { termsListHTML = termsList.toHTML(); } String queryText = browseTerm.getQueryString(); httpSession.setAttribute("queryText", queryText); httpSession.setAttribute("termsListHTML", termsListHTML); ResultSetUtility resultSetUtility = null; if (uid.equals("public")) { resultSetUtility = new ResultSetUtility(xml, Search.DEFAULT_SORT); } else { boolean isSavedDataPage = false; SavedData savedData = new SavedData(uid); resultSetUtility = new ResultSetUtility(xml, Search.DEFAULT_SORT, savedData, isSavedDataPage); } String mapButtonHTML = resultSetUtility.getMapButtonHTML(); request.setAttribute("mapButtonHTML", mapButtonHTML); //String relevanceHTML = resultSetUtility.getRelevanceHTML(); //request.setAttribute("relevanceHTML", relevanceHTML); html = resultSetUtility.xmlToHtmlTable(cwd + xslpath); request.setAttribute("searchresult", html); RequestDispatcher requestDispatcher = request.getRequestDispatcher(forward); requestDispatcher.forward(request, response); } catch (Exception e) { handleDataPortalError(logger, e); } } /** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */ public void init() throws ServletException { ServletContext servletContext = getServletContext(); PropertiesConfiguration options = ConfigurationListener.getOptions(); xslpath = options.getString("resultsetutility.xslpath"); cwd = options.getString("system.cwd"); String browseDirPath = options.getString("browse.dir"); BrowseSearch.setBrowseCacheDir(browseDirPath); BrowseSearch browseSearch = null; BrowseGroup browseGroup = null; File browseKeywordFile = new File(BrowseSearch.browseKeywordPath); if (browseKeywordFile.exists()) { browseSearch = new BrowseSearch(); browseGroup = browseSearch.readBrowseCache(browseKeywordFile); /* Lock the servlet context object to guarantee that only one thread at a * time can be getting or setting the context attribute. */ synchronized (servletContext) { servletContext.setAttribute("browseKeywordHTML", browseGroup.toHTML()); } } else { logger.warn("Missing browse keyword file at location: " + BrowseSearch.browseKeywordPath); } } }