Creating a zip of a particular rendition of assets in aem

Question

I have a list if inputStream as below which contains the stream of a particular rendition of an asset. assetResourceList is a global list<beanclass> object.

private void createZipFile( ) throws IOException {
List<InputStream> inputStreamList = new ArrayList<InputStream>();
for(Resource assetResource:assetResourceList)
{
final Asset asset = DamUtil.resolveToAsset(assetResource);
InputStream in = asset.getRendition("cq5dam.thumbnail.48.48.png").getStream();
inputStreamList.add(in);
}
}

How can i convert this inputstream to a zip of images?

I used the below code for the same, but the zip is getting created with filetype and when i open the zip, it says file format not supported. Can someone help.

private void createZipFile() throws IOException {
List<InputStream> inputStreamList = new ArrayList<InputStream>();
for(Resource assetResource:assetResourceList)
{

final Asset asset = DamUtil.resolveToAsset(assetResource);
InputStream in = asset.getRendition(DAM_THUMBNAIL).getStream();
inputStreamList.add(in);
}

try (
ZipOutputStream zos = new ZipOutputStream(
new FileOutputStream("C:\\Project\\TestZip\\assets.zip"));
) {
int count =0;
for(InputStream in:inputStreamList){

ZipEntry ze = new ZipEntry("image"+count++);
zos.putNextEntry(ze);
byte[] tmp = new byte[4*1024];
int size = 0;
while((size = in.read(tmp)) != -1){
zos.write(tmp, 0, size);
}
zos.flush();
in.close();
}
// zos.close();
}

pn_2007 · Accepted Answer

I was able to fix this with the below code.

try (
ZipOutputStream zos = new ZipOutputStream(
new FileOutputStream("C:\\Project\\TestZip\\assets.zip"));
) {
int count =0;
for(InputStream in:inputStreamList){

ByteArrayOutputStream os = new ByteArrayOutputStream();
BufferedImage jImage = ImageIO.read(in);
ImageIO.write(jImage, "png", os);
byte[] tmp = os.toByteArray();

ZipEntry ze = new ZipEntry("image"+ count++ +".png");
zos.putNextEntry(ze);
//byte[] tmp = new byte[4*1024];
//int size = 0;
//while((size = in.read(tmp)) != -1){
zos.write(tmp);
//}
zos.flush();
in.close();
os.close();
}
// zos.close();

Nitin_laad · Answer

Hi @p_v_nair , try this out -// Get the resource resolver from the current request or serviceResourceResolver resourceResolver = request.getResourceResolver();// Get the session from the resource resolverSession session = resourceResolver.adaptTo(Session.class);// Get the asset manager from the sessionAssetManager assetManager = session.getWorkspace().getVersionManager().getAssetManager();// Get the resource of the image from the DAM pathResource resource = resourceResolver.getResource("/content/dam/my-image.jpg");// Adapt the resource to an assetAsset asset = resource.adaptTo(Asset.class);// Get the file name of the asset from the metadataString fileName = asset.getMetadataValue("dc:title");// Create a temporary file to store the downloaded imageFile tempFile = File.createTempFile(fileName, ".jpg");// Copy the asset content to the temporary fileFiles.copy(asset.getOriginal().getStream(), tempFile.toPath());// Create a zip file to store the zipped imageFile zipFile = new File(fileName + ".zip");// Create a buffered output stream to write to the zip fileBufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(zipFile));// Create a zip output stream to write the zip entriesZipOutputStream zos = new ZipOutputStream(bos);// Create a zip entry for the image fileZipEntry zipEntry = new ZipEntry(fileName + ".jpg");// Put the zip entry to the zip output streamzos.putNextEntry(zipEntry);// Copy the temporary file content to the zip output streamFiles.copy(tempFile.toPath(), zos);// Close the zip entryzos.closeEntry();// Close the zip output streamzos.close();// Delete the temporary filetempFile.delete();

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