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  • Download multiple files from media and document in Liferay 6.2

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    Hello Guys,

    Liferay store files using media and document which is default functionality of liferay. Liferay support all type file.

    Below code download files with zip folder using "FileEntryID".

    NOTE : Liferay fully support to Oracle JDK.

    Follow below steps to download files from media and document in liferay.

    Step 1 : Create serveResource URL with fileEntryId parameter's.

    Step 2 : Put below code in MVCPortlet class.

          private static final String FILE_EXT_SEP = FilenameUtils.EXTENSION_SEPARATOR_STR;
        private static final String ZIP_FILE_EXT_NAME = "zip";
        private static final String ZIP_FILE_EXT = FILE_EXT_SEP + ZIP_FILE_EXT_NAME;
        private static int DEFAULT_DL_FILE_DOWNLOAD_CACHE_MAX_AGE = 1;
    
    @ProcessAction(name="serveResource")
        public void serveResource(ResourceRequest resourceRequest,
                ResourceResponse resourceResponse) throws IOException 
        {
    
            UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(resourceRequest);
            String files=(String)uploadRequest.getParameter("iFileEntryId");
    
            String [] fileIdsArray = getFileIds(files);
            logger.info("fileDownload   "+fileIdsArray[0]);
            if (null == fileIdsArray || files.isEmpty()) {
                SessionErrors.add(resourceRequest, "Please Select File.");
                resourceResponse.setProperty("portlet.http-status-code", "302");
                resourceResponse.addProperty("Location", resourceResponse.createRenderURL().toString());
                return;
            }
    
            setupResponseHeaders(resourceRequest, resourceResponse);
    
            try {
    
                downloadMultipleFilesInZip(resourceRequest, resourceResponse, fileIdsArray);
            } catch (PortalException e) {
                logger.debug("PortalException", e);
            }
    
        }
    
        private String[] getFileIds(String fileEntryIds) {
            String[] ids = fileEntryIds.split(",");
            return ids;
        }
    private void setupResponseHeaders(ResourceRequest resourceRequest, ResourceResponse resourceResponse) {
    
            String zipFileMimeType = "application/zip";
            resourceResponse.setContentType(zipFileMimeType);
            int multipleFileDownloadCacheMaxAge = DEFAULT_DL_FILE_DOWNLOAD_CACHE_MAX_AGE;
            if (multipleFileDownloadCacheMaxAge > 0) {
                String cacheControlValue = "max-age=" + multipleFileDownloadCacheMaxAge + ", must-revalidate";
                resourceResponse.addProperty("Cache-Control", cacheControlValue);
            }
    
            String zipFileName = "ATTACHMENTS_" + new Date().getTime() + ZIP_FILE_EXT;
            String contentDispositionValue = "attachment; filename=\"" + zipFileName + "\"";
            logger.info("resourceResponse>>>> "+contentDispositionValue);
            resourceResponse.addProperty("Content-Disposition", contentDispositionValue);
    
        }
    private void downloadMultipleFilesInZip(ResourceRequest resourceRequest, ResourceResponse resourceResponse, String[] fileIdsArray) throws PortalException {
        try {
            DownloadFilesZipHelper.exportMultipleFilesToZipFile( fileIdsArray, resourceResponse.getPortletOutputStream());
            logger.info("resourceResponse.getPortletOutputStream() >>>> "+resourceResponse.getPortletOutputStream().toString());
        } catch (Exception e) {
            String msg = "Error downloading files " + e.getMessage();
            logger.error(msg, e);
            throw new PortalException(msg, e);
        } 
    

    Step 3 : Create DownloadFilesZipHelper.java and put below code.

    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.zip.ZipEntry;
    import java.util.zip.ZipOutputStream;
    
    import org.apache.commons.io.FilenameUtils;
    
    import com.liferay.portal.kernel.exception.PortalException;
    import com.liferay.portal.kernel.exception.SystemException;
    import com.liferay.portal.kernel.json.JSONArray;
    import com.liferay.portal.kernel.json.JSONFactoryUtil;
    import com.liferay.portal.kernel.json.JSONObject;
    import com.liferay.portal.kernel.log.Log;
    import com.liferay.portal.kernel.log.LogFactoryUtil;
    import com.liferay.portal.kernel.repository.model.FileEntry;
    import com.liferay.portal.kernel.util.StreamUtil;
    import com.liferay.portlet.documentlibrary.service.DLAppServiceUtil;
    import com.model.PatientEvents;
    import com.service.PatientEventsLocalServiceUtil;
    
    public class DownloadFilesZipHelper {
    
        private static final Log log = LogFactoryUtil.getLog(DownloadFilesZipHelper.class);
    
        public static void exportMultipleFilesToZipFile(String[] fileIdsArray, OutputStream outputStream) throws PortalException, SystemException, IOException{
    
            List<FileEntry> filesList = getMultipleFiles(fileIdsArray);
            if (!filesList.isEmpty()) {
                exportMultipleFilesToOutputStream(filesList, outputStream);
            }
        }
    
        public static List<FileEntry> getMultipleFiles(String[] fileIdsArray) throws PortalException, SystemException {
    
            long fileEntryId;
            List<FileEntry> fileEntryList = new ArrayList<FileEntry>();
    
            for (String fileEntry : fileIdsArray) {
                fileEntryId = Long.parseLong(fileEntry);
                fileEntryList.add(DLAppServiceUtil.getFileEntry(fileEntryId));
            }
    
            return fileEntryList;
        }
    
        public static void exportMultipleFilesToOutputStream( List<FileEntry> filesList, OutputStream outputStream) throws IOException, PortalException, SystemException {
    
            ZipOutputStream zipWriter = null;
            try{
                zipWriter = new ZipOutputStream(outputStream);
                exportMultipleFilesToZipWriter( filesList, zipWriter);
            }catch (Exception e) {
                log.debug("Exception", e);
            }finally{
                if (zipWriter != null) {
                    zipWriter.close();
                }
            }
        }
    
        public static void exportMultipleFilesToZipWriter( List<FileEntry> filesList, ZipOutputStream zipOutputStream){
    
            InputStream fileInputStream = null;
            try {
                for (FileEntry fileEntry : filesList) {
    
                    String zipEntryPath = buildZipEntryPath( fileEntry, "", zipOutputStream);
    
                    fileInputStream = fileEntry.getContentStream();             
    
                    zipOutputStream.putNextEntry(new ZipEntry(zipEntryPath));
                    StreamUtil.transfer(fileInputStream, zipOutputStream, false);
    
                }
            } catch (Exception e) {         
                log.debug(e);           
            } finally {
                try {
                    if (fileInputStream != null) {
                        fileInputStream.close();
                        fileInputStream = null;
                    }
                } catch (IOException e) {
                    log.debug("IOException", e);
                }           
            }
        }
    
        private static String buildZipEntryPath( FileEntry fileEntry,
                String folderPath, ZipOutputStream zipOutputStream) throws SystemException,
                PortalException {
            String fileEntryBaseName = fileEntry.getTitle();
            fileEntryBaseName = FilenameUtils.getBaseName(fileEntryBaseName);
            fileEntryBaseName = fileEntryBaseName.replaceAll("\\W+", "_");
            String zipEntryName = folderPath + fileEntryBaseName + FilenameUtils.EXTENSION_SEPARATOR_STR + fileEntry.getExtension();
            log.info("zipEntryName    "+zipEntryName);
            return zipEntryName;
        }
    }
    

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