Java tutorial
/* MetaDB: A Distributed Metadata Collection Tool Copyright 2011, Lafayette College, Eric Luhrs, Haruki Yamaguchi, Long Ho. This file is part of MetaDB. MetaDB is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. MetaDB is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with MetaDB. If not, see <http://www.gnu.org/licenses/>. */ package edu.lafayette.metadb.web.projectman; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.ArrayList; 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.servlet.http.HttpSession; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.json.JSONException; import org.json.JSONObject; import edu.lafayette.metadb.model.commonops.Global; import edu.lafayette.metadb.model.commonops.MetaDbHelper; import edu.lafayette.metadb.model.dataman.DataImporter; import edu.lafayette.metadb.model.projects.ProjectsDAO; import edu.lafayette.metadb.model.result.Result; import edu.lafayette.metadb.model.syslog.SysLogDAO; /** * Servlet implementation class CreateProject */ public class CreateProject extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ @SuppressWarnings("unchecked") protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub PrintWriter out = response.getWriter(); JSONObject output = new JSONObject(); String delimiter = ""; String projname = ""; String projnotes = ""; String template = ""; boolean useTemplate = false; boolean disableQualifier = false; try { if (ServletFileUpload.isMultipartContent(request)) { ServletFileUpload servletFileUpload = new ServletFileUpload(new DiskFileItemFactory()); List fileItemsList = servletFileUpload.parseRequest(request); DiskFileItemFactory diskFileItemFactory = new DiskFileItemFactory(); diskFileItemFactory.setSizeThreshold(40960); /* the unit is bytes */ Iterator it = fileItemsList.iterator(); InputStream input = null; while (it.hasNext()) { FileItem fileItem = (FileItem) it.next(); //MetaDbHelper.note("Field name: "+fileItem.getFieldName()); //MetaDbHelper.note(fileItem.getString()); if (fileItem.isFormField()) { /* * The file item contains a simple name-value pair of a * form field */ if (fileItem.getFieldName().equals("delimiter") && delimiter.equals("")) delimiter = fileItem.getString(); else if (fileItem.getFieldName().equals("projname") && projname.equals("")) projname = fileItem.getString().replace(" ", "_"); else if (fileItem.getFieldName().equals("projnotes") && projnotes.equals("")) projnotes = fileItem.getString(); else if (fileItem.getFieldName().equals("project-template-checkbox")) useTemplate = true; else if (fileItem.getFieldName().equals("project-template")) template = fileItem.getString().replace(" ", "_"); //else if (fileItem.getFieldName().equals("disable-qualifier-checkbox")) //disableQualifier = true; } else input = fileItem.getInputStream(); } String userName = Global.METADB_USER; HttpSession session = request.getSession(false); if (session != null) { userName = (String) session.getAttribute(Global.SESSION_USERNAME); } //MetaDbHelper.note("Delimiter: "+delimiter+", projname: "+projname+", projnotes: "+projnotes+", use template or not? "+useTemplate+" template: "+template); if (useTemplate) { ProjectsDAO.createProject(template, projname, projnotes, ""); output.put("projname", projname); output.put("success", true); output.put("message", "Project created successfully based on: " + template); SysLogDAO.log(userName, Global.SYSLOG_PROJECT, "User created project " + projname + " with template from " + template); } else { if (ProjectsDAO.createProject(projname, projnotes)) { output.put("projname", projname); String delimiterType = "csv"; if (delimiter.equals("tab")) { delimiterType = "tsv"; disableQualifier = true; // Disable text qualifiers for TSV files. } //MetaDbHelper.note("Delim: "+delimiterType+", projname: "+projname+", input: "+input); if (input != null) { Result res = DataImporter.importFile(delimiterType, projname, input, disableQualifier); output.put("success", res.isSuccess()); if (res.isSuccess()) { output.put("message", "Data import successfully"); SysLogDAO.log(userName, Global.SYSLOG_PROJECT, "User created project " + projname + " with file import"); } else { output.put("message", "The following fields have been changed"); SysLogDAO.log(userName, Global.SYSLOG_PROJECT, "User created project " + projname + " with file import"); String fields = ""; ArrayList<String> data = (ArrayList<String>) res.getData(); for (String field : data) fields += field + ','; output.put("fields", fields); } } else { output.put("success", true); output.put("message", "Project created successfully with default fields. No data imported"); SysLogDAO.log(userName, Global.SYSLOG_PROJECT, "User created project " + projname); } } else { output.put("success", false); output.put("message", "Cannot create project"); SysLogDAO.log(userName, Global.SYSLOG_PROJECT, "User failed to create project " + projname); } } } else { output.put("success", false); output.put("message", "Form is not multi-part"); } } catch (NullPointerException e) { try { output.put("success", true); output.put("message", "Project created successfully"); } catch (JSONException e1) { MetaDbHelper.logEvent(e1); } } catch (Exception e) { MetaDbHelper.logEvent(e); try { output.put("success", false); output.put("message", "Project was not created"); } catch (JSONException e1) { MetaDbHelper.logEvent(e1); } } out.print(output); out.flush(); } }