Java tutorial
package org.oryxeditor.server; import java.io.BufferedWriter; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.StringWriter; import java.net.ConnectException; import java.net.HttpURLConnection; import java.net.URL; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.apache.commons.codec.binary.Base64; import org.apache.commons.configuration.Configuration; import org.apache.commons.configuration.ConfigurationException; import org.apache.commons.configuration.PropertiesConfiguration; import org.w3c.dom.Document; import org.xml.sax.SAXException; import org.apache.xml.serialize.OutputFormat; import org.apache.xml.serialize.XMLSerializer; import de.hpi.bpmn.BPMNDiagram; import de.hpi.bpmn.rdf.BPMNRDFImporter; import de.hpi.bpmn2execpn.converter.ExecConverter; import de.hpi.execpn.ExecPetriNet; import de.hpi.execpn.pnml.ExecPNPNMLExporter; import de.hpi.petrinet.PetriNet; /** * Copyright (c) 2007 Alexander Koglin Copyright (c) 2008 Lutz Gericke * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ public class ExportServlet extends HttpServlet { private static Configuration config = null; private static final long serialVersionUID = 2381703508756797343L; protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { res.setContentType("text/html"); try { if (config == null) { config = new PropertiesConfiguration("pnengine.properties"); } } catch (ConfigurationException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String postVariable = config.getString("pnengine.post_variable"); String engineURL = config.getString("pnengine.url") + "/petrinets"; String engineURL_host = config.getString("pnengine.url"); String modelURL = config.getString("pnengine.default_model_url"); // String formURL = null; // String bindingsURL = null; String rdf = req.getParameter("data"); String diagramTitle = req.getParameter("title"); DocumentBuilder builder; BPMNDiagram diagram; try { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); builder = factory.newDocumentBuilder(); Document document = builder.parse(new ByteArrayInputStream(rdf.getBytes())); BPMNRDFImporter importer = new BPMNRDFImporter(document); diagram = (BPMNDiagram) importer.loadBPMN(); String basefilename = String.valueOf(System.currentTimeMillis()); String tmpPNMLFile = this.getServletContext().getRealPath("/") + "tmp" + File.separator + basefilename + ".pnml"; BufferedWriter out1 = new BufferedWriter(new FileWriter(tmpPNMLFile)); // URL only for testing purposes... ExecConverter converter = new ExecConverter(diagram, modelURL, this.getServletContext().getRealPath("/")); converter.setBaseFileName( this.getServletContext().getRealPath("/") + "tmp" + File.separator + basefilename); PetriNet net = converter.convert(); ExecPetriNet execnet = (ExecPetriNet) net; Document pnmlDoc = builder.newDocument(); ExecPNPNMLExporter exp = new ExecPNPNMLExporter(); execnet.setName(diagramTitle); exp.savePetriNet(pnmlDoc, execnet); OutputFormat format = new OutputFormat(pnmlDoc); XMLSerializer serial = new XMLSerializer(out1, format); serial.asDOMSerializer(); serial.serialize(pnmlDoc.getDocumentElement()); out1.close(); StringWriter stringOut = new StringWriter(); XMLSerializer serial2 = new XMLSerializer(stringOut, format); serial2.asDOMSerializer(); serial2.serialize(pnmlDoc.getDocumentElement()); URL url_engine = new URL(engineURL); HttpURLConnection connection_engine = (HttpURLConnection) url_engine.openConnection(); connection_engine.setRequestMethod("POST"); String encoding = new String(Base64.encodeBase64(("testuser:" + ":").getBytes())); ; connection_engine.setRequestProperty("Authorization", "Basic " + encoding); connection_engine.setUseCaches(false); connection_engine.setDoInput(true); connection_engine.setDoOutput(true); String escaped_content = postVariable + "=" + URLEncoder.encode(stringOut.toString(), "UTF-8"); connection_engine.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); connection_engine.setRequestProperty("Accept", "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5"); // connection_engine.setRequestProperty("Content-Length", // ""+escaped_content.getBytes().length); String errorMessage = null; try { connection_engine.getOutputStream().write(escaped_content.getBytes()); connection_engine.connect(); } catch (ConnectException e) { errorMessage = e.getMessage(); } // output link address res.getWriter().print("tmp/" + basefilename + ".pnml" + "\">View PNML</a><br/><br/>"); if (errorMessage == null && connection_engine.getResponseCode() == 200) { res.getWriter().println("Deployment to Engine <a href=\"" + engineURL_host + "/worklist\" target=\"_blank\">" + engineURL_host + "</a><br/><b>successful</b>!"); } else { res.getWriter().println("Deployment to Engine <a href=\"" + engineURL + "\" target=\"_blank\">" + engineURL + "</a><br/><b>failed</b> with message: \n" + errorMessage + "!"); } } catch (ParserConfigurationException e1) { res.getWriter().println(e1.getMessage()); } catch (SAXException e1) { res.getWriter().println(e1.getMessage()); } } }