Java tutorial
/* * Copyright 2008, 2012 Pedro Agull Soliveres. * * This file is part of DirectJNgine. * * DirectJNgine is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License. * * Commercial use is permitted to the extent that the code/component(s) * do NOT become part of another Open Source or Commercially developed * licensed development library or toolkit without explicit permission. * * DirectJNgine 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with DirectJNgine. If not, see <http://www.gnu.org/licenses/>. * * This software uses the ExtJs library (http://extjs.com), which is * distributed under the GPL v3 license (see http://extjs.com/license). */ package com.softwarementors.extjs.djn.router.processor.standard.form.upload; import java.io.IOException; import java.io.Writer; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.log4j.Logger; import com.softwarementors.extjs.djn.api.Registry; import com.softwarementors.extjs.djn.config.GlobalConfiguration; import com.softwarementors.extjs.djn.router.dispatcher.Dispatcher; import com.softwarementors.extjs.djn.router.processor.standard.form.FormPostRequestProcessorBase; import edu.umd.cs.findbugs.annotations.NonNull; public class UploadFormPostRequestProcessor extends FormPostRequestProcessorBase { @NonNull private static final Logger logger = Logger.getLogger(UploadFormPostRequestProcessor.class); public UploadFormPostRequestProcessor(Registry registry, Dispatcher dispatcher, GlobalConfiguration globalConfiguration) { super(registry, dispatcher, globalConfiguration); } public void process(List<FileItem> fileItems, Writer writer) throws IOException { assert fileItems != null; assert writer != null; Map<String, String> formParameters = new HashMap<String, String>(); Map<String, FileItem> fileFields = new HashMap<String, FileItem>(); for (FileItem item : fileItems) { if (item.isFormField()) { formParameters.put(item.getFieldName(), item.getString()); } else { fileFields.put(item.getFieldName(), item); } } if (logger.isDebugEnabled()) { // Avoid expensive function calls if logging is not needed logger.debug("Request data (UPLOAD FORM)=>" + getFormParametersLogString(formParameters) + " FILES: " + getFileParametersLogString(fileFields)); } String result = process(formParameters, fileFields); String resultString = "<html><body><textarea>"; resultString += result; resultString += ("</textarea></body></html>"); writer.write(resultString); if (logger.isDebugEnabled()) { logger.debug("ResponseData data (UPLOAD FORM)=>" + resultString); } } private static String getFormParametersLogString(Map<String, String> formParameters) { StringBuilder result = new StringBuilder(); for (Map.Entry<String, String> entry : formParameters.entrySet()) { String fieldName = entry.getKey(); String value = entry.getValue(); result.append(fieldName); result.append("="); result.append(value); result.append(";"); } return result.toString(); } private static String getFileParametersLogString(Map<String, FileItem> fileFields) { StringBuilder result = new StringBuilder(); for (Map.Entry<String, FileItem> entry : fileFields.entrySet()) { FileItem fileItem = entry.getValue(); String fieldName = entry.getKey(); result.append(fieldName); result.append("="); String fileName = fileItem.getName(); result.append(fileName); result.append(";"); } return result.toString(); } public static ServletFileUpload createFileUploader() { // Create a factory for disk-based file items DiskFileItemFactory2 factory = new DiskFileItemFactory2(); // Set factory constraints so that files are never written to disk final int MAX_UPLOAD_MEMORY_SIZE = Integer.MAX_VALUE; // If request size bigger than this, store files to disk factory.setSizeThreshold(MAX_UPLOAD_MEMORY_SIZE); // Avoid creating a cleaning thread which Google AppEngine will not like! factory.setFileCleaningTracker(null); // Create a new file upload handler ServletFileUpload upload = new ServletFileUpload(factory); // Set upload handler limits upload.setSizeMax(MAX_UPLOAD_MEMORY_SIZE); upload.setFileSizeMax(MAX_UPLOAD_MEMORY_SIZE); return upload; } public void handleFileUploadException(FileUploadException e) { assert e != null; com.softwarementors.extjs.djn.router.processor.standard.form.upload.FileUploadException ex = com.softwarementors.extjs.djn.router.processor.standard.form.upload.FileUploadException .forFileUploadException(e); logger.error(ex.getMessage(), ex); throw ex; } }