Question

I have ejb + JPA app on GF3 server and remote swing client. I want upload large files from client to server’s database over stateless session bean.
how to upload large binary data from remote swing client?

Answer 1

In Entity Bean, you can use Blob field type & annotate it by @Lob to persist such data directly into database.

//– Edit Part

For such a large file, you can fetch the file contents into byte array of fixed size such that client won’t run out of memory.

Client side:

//-------------    

    remoteInterface.initializeArraySize(ARRAY_SIZE);

    double splitIterations = ARRAY_SIZE/PERMISSIBLE_SIZE;

    for(int i=0; i < splitIterations; i++){

    // Get next byte[PERMISSIBLE_SIZE] from File

        remoteInterface.appendToArray(splittedArray);
    }

    // Finally uploading after processing

        remoteInterface.uploadFile

//---------------

Server side:

    @Stateless
    public class FileUploadSessionBean implements FileUploadSessionBeanRemote {

    private byte[] byteArray;

    public void initializeArraySize(double arraySize){

         // Initilialized only once
         byteArray = new byteArray[arraySize];
    }

    public void appendToArray(byte[] splittedByteArray){

    /* Append the splittedByteArray at end to byteArray each time
       to build the original array
    */
    }

    public void uploadFile(){

      // Convert byteArray to Blob & persist
    }
}