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 javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.codec.net.URLCodec; import org.apache.commons.configuration.PropertiesConfiguration; import org.apache.commons.io.FileUtils; 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 ReportViewerServlet extends DataPortalServlet { /** * Class variables */ private static final Logger logger = Logger.getLogger(edu.lternet.pasta.portal.ReportViewerServlet.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 ReportViewerServlet() { 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 packageId = request.getParameter("packageid"); String encodedPath = request.getParameter("localPath"); String scope = null; Integer identifier = null; String revision = null; String xml = null; String html = null; try { String[] tokens = packageId.split("\\."); if (tokens.length == 3) { scope = tokens[0]; identifier = Integer.valueOf(tokens[1]); revision = tokens[2]; /* * The quality report XML could be read either from a local file * or from PASTA via the DataPackageManagerClient. */ if (encodedPath != null && encodedPath.length() > 0) { URLCodec urlCodec = new URLCodec(); String localPath = urlCodec.decode(encodedPath); File xmlFile = new File(localPath); if (xmlFile != null && xmlFile.exists()) { xml = FileUtils.readFileToString(xmlFile); } } else { DataPackageManagerClient dpmClient = new DataPackageManagerClient(uid); xml = dpmClient.readDataPackageReport(scope, identifier, revision); } ReportUtility qrUtility = new ReportUtility(xml); html = HTMLHEAD + "<div class=\"qualityreport\">" + qrUtility.xmlToHtmlTable(cwd + xslpath) + "</div>" + HTMLTAIL; } else { String msg = String.format( "packageId '%s' is not in the correct form of 'scope.identifier.revision' (e.g., 'knb-lter-lno.1.1')", packageId); throw new UserErrorException(msg); } } 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"); } }