Java tutorial
package org.elissa.server; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.StringWriter; import java.io.UnsupportedEncodingException; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import java.util.List; 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 javax.xml.transform.Result; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import javax.xml.transform.stream.StreamSource; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItem; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.w3c.dom.Document; import org.xml.sax.InputSource; import org.xml.sax.SAXException; //import com.sun.org.apache.xerces.internal.parsers.DOMParser; import de.hpi.bpt.epc.EPC; import de.hpi.bpt.epc.aml.util.AMLParser; import de.hpi.bpt.epc.aml.util.OryxSerializer; /** * Copyright (c) 2008 Willi Tscheschner * * 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 AMLSupport extends HttpServlet { private static final long serialVersionUID = 316274845723034029L; /** * The POST request.EPCUpload.java */ protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException { PrintWriter out = null; FileItem fileItem = null; try { String oryxBaseUrl = req.getScheme() + "://" + req.getServerName() + ":" + req.getServerPort() + req.getContextPath() + "/"; // Get the PrintWriter res.setContentType("text/plain"); res.setCharacterEncoding("utf-8"); out = res.getWriter(); // No isMultipartContent => Error final boolean isMultipartContent = ServletFileUpload.isMultipartContent(req); if (!isMultipartContent) { printError(out, "No Multipart Content transmitted."); return; } // Get the uploaded file final FileItemFactory factory = new DiskFileItemFactory(); final ServletFileUpload servletFileUpload = new ServletFileUpload(factory); servletFileUpload.setSizeMax(-1); final List<?> items; items = servletFileUpload.parseRequest(req); if (items.size() != 1) { printError(out, "Not exactly one File."); return; } fileItem = (FileItem) items.get(0); // replace dtd reference by existing reference /oryx/lib/ARIS-Export.dtd String amlStr = fileItem.getString("UTF-8"); amlStr = amlStr.replaceFirst("\"ARIS-Export.dtd\"", "\"" + oryxBaseUrl + "lib/ARIS-Export.dtd\""); FileOutputStream fileout = null; OutputStreamWriter outwriter = null; try { fileout = new FileOutputStream(((DiskFileItem) fileItem).getStoreLocation()); outwriter = new OutputStreamWriter(fileout, "UTF-8"); outwriter.write(amlStr); outwriter.flush(); } finally { if (outwriter != null) outwriter.close(); if (fileout != null) fileout.close(); } //parse AML file AMLParser parser = new AMLParser(((DiskFileItem) fileItem).getStoreLocation().getAbsolutePath()); parser.parse(); Collection<EPC> epcs = new HashSet<EPC>(); Iterator<String> ids = parser.getModelIds().iterator(); while (ids.hasNext()) { String modelId = ids.next(); epcs.add(parser.getEPC(modelId)); } // serialize epcs to eRDF oryx format OryxSerializer oryxSerializer = new OryxSerializer(epcs, oryxBaseUrl); oryxSerializer.parse(); Document outputDocument = oryxSerializer.getDocument(); // get document as string String docAsString = ""; Source source = new DOMSource(outputDocument); StringWriter stringWriter = new StringWriter(); Result result = new StreamResult(stringWriter); TransformerFactory tfactory = TransformerFactory.newInstance(); Transformer transformer = tfactory.newTransformer(); transformer.transform(source, result); docAsString = stringWriter.getBuffer().toString(); // write response out.print("" + docAsString + ""); } catch (Exception e) { handleException(out, e); } finally { if (fileItem != null) { fileItem.delete(); } } } private void printError(PrintWriter out, String err) { if (out != null) { out.print("" + err + ""); } } private void handleException(PrintWriter out, Exception e) { e.printStackTrace(); printError(out, e.getLocalizedMessage()); } }