Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com) * * This library 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 library 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. * * For further information about Alkacon Software GmbH, please see the * company website: http://www.alkacon.com * * For further information about OpenCms, please see the * project website: http://www.opencms.org * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package org.opencms.workplace.commons; import org.opencms.db.CmsDbSqlException; import org.opencms.file.CmsFile; import org.opencms.file.CmsResource; import org.opencms.file.CmsResourceFilter; import org.opencms.jsp.CmsJspActionElement; import org.opencms.main.CmsException; import org.opencms.main.OpenCms; import org.opencms.security.CmsPermissionSet; import org.opencms.workplace.CmsDialog; import org.opencms.workplace.CmsWorkplaceSettings; import java.util.Iterator; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.jsp.JspException; import javax.servlet.jsp.PageContext; import org.apache.commons.fileupload.FileItem; /** * The replace resource dialog handles the replacement of a single VFS file.<p> * * The following files use this class: * <ul> * <li>/commons/replace.jsp * </ul> * <p> * * @since 6.0.0 */ public class CmsReplace extends CmsDialog { /** The dialog type.<p> */ public static final String DIALOG_TYPE = "replace"; /** Request parameter name for the upload file name.<p> */ public static final String PARAM_UPLOADFILE = "uploadfile"; /** * Public constructor with JSP action element.<p> * * @param jsp an initialized JSP action element */ public CmsReplace(CmsJspActionElement jsp) { super(jsp); } /** * Public constructor with JSP variables.<p> * * @param context the JSP page context * @param req the JSP request * @param res the JSP response */ public CmsReplace(PageContext context, HttpServletRequest req, HttpServletResponse res) { this(new CmsJspActionElement(context, req, res)); } /** * Uploads the specified file and replaces the VFS file.<p> * * @throws JspException if inclusion of error dialog fails */ public void actionReplace() throws JspException { try { // get the file item from the multipart request Iterator i = getMultiPartFileItems().iterator(); FileItem fi = null; while (i.hasNext()) { fi = (FileItem) i.next(); if (fi.getName() != null) { // found the file object, leave iteration break; } } if (fi != null) { // get file object information long size = fi.getSize(); long maxFileSizeBytes = OpenCms.getWorkplaceManager().getFileBytesMaxUploadSize(getCms()); // check file size if ((maxFileSizeBytes > 0) && (size > maxFileSizeBytes)) { // file size is larger than maximum allowed file size, throw an error throw new CmsException(Messages.get().container(Messages.ERR_FILE_SIZE_TOO_LARGE_1, new Long((maxFileSizeBytes / 1024)))); } byte[] content = fi.get(); fi.delete(); // determine the resource type id from the resource to replace CmsResource res = getCms().readResource(getParamResource(), CmsResourceFilter.IGNORE_EXPIRATION); CmsFile file = getCms().readFile(res); byte[] contents = file.getContents(); int resTypeId = res.getTypeId(); // check the lock state and replace resource checkLock(getParamResource()); try { getCms().replaceResource(getParamResource(), resTypeId, content, null); } catch (CmsDbSqlException sqlExc) { // SQL error, probably the file is too large for the database settings, restore old content file.setContents(contents); getCms().writeFile(file); throw sqlExc; } // close dialog actionCloseDialog(); } else { throw new CmsException(Messages.get().container(Messages.ERR_UPLOAD_FILE_NOT_FOUND_0)); } } catch (Throwable e) { // error replacing file, show error dialog includeErrorpage(this, e); } } /** * @see org.opencms.workplace.CmsWorkplace#initWorkplaceRequestValues(org.opencms.workplace.CmsWorkplaceSettings, javax.servlet.http.HttpServletRequest) */ protected void initWorkplaceRequestValues(CmsWorkplaceSettings settings, HttpServletRequest request) { // fill the parameter values in the get/set methods fillParamValues(request); // check the required permissions to replace the resource if (!checkResourcePermissions(CmsPermissionSet.ACCESS_WRITE, false)) { // no write permissions for the resource, set cancel action to close dialog setParamAction(DIALOG_CANCEL); } // set the dialog type setParamDialogtype(DIALOG_TYPE); // set the action for the JSP switch if (DIALOG_OK.equals(getParamAction())) { // ok button pressed, replace file setAction(ACTION_OK); } else if (DIALOG_CANCEL.equals(getParamAction())) { // cancel button pressed setAction(ACTION_CANCEL); } else { // first call of dialog setAction(ACTION_DEFAULT); // build title for replace resource dialog setParamTitle( key(Messages.GUI_REPLACE_FILE_1, new Object[] { CmsResource.getName(getParamResource()) })); } } }