Java tutorial
/* * Copyright (C) 2009 eXo Platform SAS. * * This 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 2.1 of * the License, or (at your option) any later version. * * This software 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 this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ package org.exoplatform.frameworks.jcr.command.web; import org.apache.commons.chain.Command; import org.apache.commons.chain.Context; import org.exoplatform.commons.utils.MimeTypeResolver; import org.exoplatform.frameworks.jcr.command.DefaultKeys; import org.exoplatform.frameworks.jcr.command.JCRCommandHelper; import java.io.InputStream; import java.io.PrintWriter; import javax.jcr.ItemNotFoundException; import javax.jcr.Node; import javax.jcr.PathNotFoundException; import javax.jcr.Property; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Created by The eXo Platform SAS .<br/> the command to output nt:resource to Servlet Response gets * DefaultKeys.PATH attrribute from the Context and acts as follow: - if there is nt:resource Node * on DefaultKeys.PATH displays it - otherwise recursively tries to get nt:resource from incoming * node's primary items and display it - throws PathNotFoundException if no such a node found * WARNING: this mechanizm is not suitable for big files streaming as uses byte arry buffer for data * transfer! * * @author Gennady Azarenkov * @version $Id: DisplayResourceCommand.java 13861 2007-03-28 11:31:16Z vetal_ok $ */ public class DisplayResourceCommand implements Command { public static String DEFAULT_MAPPING = "/jcr"; public static String DEFAULT_ENCODING = "UTF-8"; private String pathKey = DefaultKeys.PATH; /* * (non-Javadoc) * @see org.apache.commons.chain.Command#execute(org.apache.commons.chain.Context) */ public boolean execute(Context context) throws Exception { GenericWebAppContext webCtx = (GenericWebAppContext) context; HttpServletResponse response = webCtx.getResponse(); HttpServletRequest request = webCtx.getRequest(); // standalone request? String servletPath = request.getPathInfo(); boolean doClose = true; // or included? if (servletPath == null) { servletPath = (String) request.getAttribute("javax.servlet.include.path_info"); if (servletPath != null) doClose = false; } Node file = (Node) webCtx.getSession().getItem((String) context.get(pathKey)); file.refresh(false); Node content = null; try { content = JCRCommandHelper.getNtResourceRecursively(file); } catch (ItemNotFoundException e) { // Patch for ver 1.0 back compatibility // as exo:image was not primary item if (file.isNodeType("exo:article")) { try { content = file.getNode("exo:image"); } catch (PathNotFoundException e1) { throw e; // new ItemNotFoundException("No nt:resource node found at // "+file.getPath()+" nor primary items of nt:resource type // "); } } else { throw e; // new ItemNotFoundException("No nt:resource node found at // "+file.getPath()+" nor primary items of nt:resource type // "); } } // if(file.isNodeType("nt:file")) { // content = file.getNode("jcr:content"); // } else if(file.isNodeType("exo:article")) { // content = file.getNode("exo:image"); // } else // throw new Exception("Invalid node type, expected nt:file or exo:article, // have "+file.getPrimaryNodeType().getName()+" at "+file.getPath()); Property data; try { data = content.getProperty("jcr:data"); } catch (PathNotFoundException e) { throw new PathNotFoundException("No jcr:data node found at " + content.getPath()); } String mime = content.getProperty("jcr:mimeType").getString(); String encoding = content.hasProperty("jcr:encoding") ? content.getProperty("jcr:encoding").getString() : DEFAULT_ENCODING; MimeTypeResolver resolver = new MimeTypeResolver(); String fileName = file.getName(); String fileExt = ""; if (fileName.lastIndexOf(".") > -1) { fileExt = fileName.substring(fileName.lastIndexOf(".") + 1); fileName = fileName.substring(0, fileName.lastIndexOf(".")); } String mimeExt = resolver.getExtension(mime); if (fileExt == null || fileExt.length() == 0) { fileExt = mimeExt; } response.setContentType(mime + "; charset=" + encoding); String parameter = (String) context.get("cache-control-max-age"); String cacheControl = parameter == null ? "" : "public, max-age=" + parameter; response.setHeader("Cache-Control: ", cacheControl); response.setHeader("Pragma: ", ""); // leave blank to avoid IE errors response.setHeader("Content-disposition", "attachment; filename=\"" + fileName + "." + fileExt + "\""); if (mime.startsWith("text")) { PrintWriter out = response.getWriter(); out.write(data.getString()); out.flush(); if (doClose) out.close(); } else { InputStream is = data.getStream(); byte[] buf = new byte[is.available()]; is.read(buf); ServletOutputStream os = response.getOutputStream(); os.write(buf); os.flush(); if (doClose) os.close(); } return true; } /** * @return path Key */ public String getPathKey() { return pathKey; } }