Upload
- Usage
- Flow Usage
Defining a Receiver Instance
A Receiver
instance should be specified to receive uploaded data.
The receiver provides an OutputStream
for the framework, where it writes the content of the received file.
You can implement the interface directly, or use the prebuilt helpers that buffer the file content for later access.
The built-in implementations of Receiver
are:
-
FileBuffer
-
MemoryBuffer
-
MultiFileBuffer
-
MultiFileMemoryBuffer
.
The last two implement MultiFileReceiver
and can be used to upload multiple files at once.
Example: Simple Receiver
instance that allows uploading of one file.
MemoryBuffer memoryBuffer = new MemoryBuffer();
Upload upload = new Upload(memoryBuffer);
upload.addFinishedListener(e -> {
InputStream inputStream = memoryBuffer.getInputStream();
// read the contents of the buffered memory
// from inputStream
});
-
The uploaded data is stored in a file on the file system.
-
You can read the data using the
getInputStream()
method inMemoryBuffer
when the upload is finished.
You can use a MultiFileReceiver
to allow uploading of more than one file.
Example: Using MultiFileMemoryBuffer
MultiFileMemoryBuffer multiFileMemoryBuffer = new MultiFileMemoryBuffer();
Upload upload = new Upload(multiFileMemoryBuffer);
-
The
MultiFileMemoryBuffer
class is a ready-made implementation ofMultiFileReceiver
. -
The data is stored in files on the file system and you can get the data using a file name and the
getInputStream(String)
method.