Why download popup window in browser not showing up when using JAX-RS v.s. standard servlet?

When I try using standard servlet approach, in my browser the popup window shows up asking me whether to open .xls file or save it.

I tried the exactly same code via JAX-RS and the browser popup won't show up somehow. Has anyone encounter this?

JAX-RS way that won't display popup:

@Path("excellaTest")
public class ExcellaTestResource 开发者_如何学JAVA{
    @Context
    private UriInfo context;
    @Context
    private HttpServletResponse response;
    @Context
    private HttpServletRequest request;

    public ExcellaTestResource() {
    }


    @Path("horizontalProcess")
    @GET
    //@Produces("application/vnd.ms-excel")
    @Produces("application/vnd.ms-excel")
    public void getProcessHorizontally() {
        try {

            URL templateFileUrl = this.getClass().getResource("myExcelTemplate.xls");
            String templateFilePath = URLDecoder.decode(templateFileUrl.getPath(), "UTF-8");
            String outputFileDir = "MasatoExcelHorizontalOutput";
            ReportProcessor reportProcessor = new ReportProcessor();
            ReportBook outputBook = new ReportBook(templateFilePath, outputFileDir, ExcelExporter.FORMAT_TYPE);

            ReportSheet outputSheet = new ReportSheet("myExcelSheet");
            outputBook.addReportSheet(outputSheet);

            reportProcessor.addReportBookExporter(new OutputStreamExporter(response));
            reportProcessor.process(outputBook);

            System.out.println("done!!");
        }
        catch(Exception e) {
            System.out.println(e);
        }

        return;
    }


}//end class


class OutputStreamExporter extends ReportBookExporter {

    private HttpServletResponse response;

    public OutputStreamExporter(HttpServletResponse response) {
        this.response = response;
    }

    //ReportProcessor output()
    //This method is call when ReportProcessor process() is invoked.
    //The Workbook from POI API can be used to write to stream

    @Override
    public void output(Workbook book, BookData bookdata, ConvertConfiguration configuration) throws ExportException {

        //TODO write to stream
        try {
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment; filename=masatoExample.xls");
            book.write(response.getOutputStream());
            response.getOutputStream().close();
            System.out.println("booya!!");
        }
        catch(Exception e) {
            System.out.println(e);
        }
    }

}//end class

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What JAX-RS framework are you using?

My guess is that your code doesn't work, because you are returning void. The framework you are using probably recognizes void as HTTP 204 No Content. This causes browser to skip the actual response body and to ignore conntent-disposition header.

As I already wrote you in a parallel thread: try to returning Response object. You can put either OutputStream or byte[] as entity as set the content-disposition header.

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I have never used class level injection for a jax-rs service. I suggest one of 2 solutions.

1) Try injecting the request and response as method arguments.

2) Output your file to a byte array output stream and return a byte array from your method instead of void.