My work around to fetch data even when I don't know the exact filesize or
ending EOF.
private byte[] getImageBytes(BlobData blobData) {
if (blobData == null) {
return null;
}
BlobKey blobKey = new BlobKey(blobData.getKey());
if (blobKey == null) {
return null;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
long filesize = blobData.getSize();
int chunkSize = 1024;
long offset = 0;
while (offset < filesize) {
long limit = offset + chunkSize - 1;
if (filesize < limit) {
limit = filesize - 1;
}
System.out.println("offset=" + offset + " limit=" + limit + " size=" +
filesize);
byte[] b = null;
try {
b = blobstoreService.fetchData(blobKey, offset, limit);
} catch (Exception e) {
//e.printStackTrace();
System.out.println("Ga_Service_Image.getImageBytes(): doing
workaround");
workaround(out, blobKey, offset, filesize);
break;
}
try {
if (b != null) {
out.write(b);
}
} catch (IOException e) {
e.printStackTrace();
return null;
}
offset += chunkSize;
if (offset > filesize) {
offset = filesize;
}
}
byte[] filebytes = out.toByteArray();
System.out.println("getImageBytes(): filebytes size: " + filebytes.length +
" blobData.size=" + blobData.getSize());
return filebytes;
}
private void workaround(ByteArrayOutputStream out, BlobKey blobKey, long
offset, long filesize) {
int chunkSize = 1;
long limit = 0;
while (offset < filesize) {
limit = offset + chunkSize - 1;
if (filesize < limit) {
limit = filesize;
}
System.out.println("offset=" + offset + " limit=" + limit + " size=" +
filesize);
byte[] b = null;
try {
b = blobstoreService.fetchData(blobKey, offset, limit);
} catch (Exception e) {
//e.printStackTrace();
return;
}
try {
out.write(b);
} catch (IOException e) {
e.printStackTrace();
return;
}
offset += chunkSize;
if (offset > filesize) {
offset = filesize;
}
}
}
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