dwr - upload file and download file in one request

Question

is it possible to upload a file and subsequently when receiving response download the file,

I mean in one request I'll upload a file and download the file in one action?

Answer 1

Yes It's possible to do that at least in dwr 3.

Answer 2

Maybe this demo code will be helpful for you: http://directwebremoting.org/dwr-demo/simple/download.html

Answer 3

An example which return a excel to download from client:

//Java side:

public FileTransfer getExcel(Parametros param){
   byte[] result = <here get data>;
   InputStream myInputStream = new ByteArrayInputStream(result); 
   String excelFormat = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
   FileTransfer dwrExcelFile = new FileTransfer("excel.xlsx", excelFormat, myInputStream);
   return dwrExcelFile;
}

//Javascript side:

function downloadExcelFile() {
  dwr.engine.setTimeout(59000);
  var params = <params_to_send>;
  <Java_class>.getExcel(params, {callback:function(dataFromServer) {
    downloadExcelCallback(dataFromServer);
  }});
}

function downloadExcelCallback(data) {
   dwr.engine.openInDownload(data);
}