How to use

flushBuffer

method

in

javax.portlet.ResourceResponse

@Override
public void flushBuffer() throws IOException {
  wrappedResourceResponse.flushBuffer();
}

/**
 * The default behavior of this method is to call 
 * <code>flushBuffer()</code> on the wrapped response object.
 */ 
public void flushBuffer() throws IOException {
  response.flushBuffer();
}

@Override
public void flushBuffer() throws IOException {
  wrappedResourceResponse.flushBuffer();
}

public void flushBuffer() throws java.io.IOException {
  _res.flushBuffer();
}

 public void descargarRecibo(ResourceRequest request,
    ResourceResponse response, PortletSession session,
    ModelMap modelMap) {
  FileInputStream fileInputStream = null;
  BufferedInputStream bufferedInputStream = null;

  String fileURL = "c:/intranetdoc/PDetalleLlamadas/file.pdf";

  try {
    fileInputStream = new java.io.FileInputStream(fileURL);
    OutputStream outputStream = response.getPortletOutputStream();
    response.setContentType("application/pdf");
    response.addProperty("Content-Disposition", "attachment; filename="
        + fileName);
    bufferedInputStream = new java.io.BufferedInputStream(
        fileInputStream);
    byte[] bytes = new byte[bufferedInputStream.available()];
    response.setContentLength(bytes.length);
    int aByte = 0;
    while ((aByte = bufferedInputStream.read()) != -1) {
      outputStream.write(aByte);
    }
    outputStream.flush();
    bufferedInputStream.close();
    response.flushBuffer();
  } catch (Exception e) {
    e.printStackTrace();
  }
}