Re: Can't download a zip file from Server at Button Click in GWT

Thanks for reply.

I tried to define it earlier in the code but the problem still exists. Could you please guide :)

On Thursday, September 18, 2014 11:21:23 AM UTC+2, Xerox Shah wrote:

I am new to GWT, I want to download a zip file stored on Server. At   Client side I want to download a file by save as window at button click   event.

My client side code is:

String filename = customer.getId();  String url = GWT.getModuleBaseURL() + "FileUploadDownloadServlet?filename=" + filename;  Window.open(url, "_blank", "status=0,toolbar=0,menubar=0,location=0");

My Servlet code is:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {      super.doGet(request, response);        String filename = request.getParameter("filename");      if (filename == null) {          response.sendError(SC_BAD_REQUEST, "Missing file Name");          return;      }        // Load zip file with filename from Backup Directory      File zipFile = new File(fileBackupPath + File.separator + filename + ".zip");      File file = new File(zipFile.toString());        long length = file.length();      FileInputStream fis = new FileInputStream(file);      response.addHeader("Content-Disposition","attachment; filename=\"" + filename + "\"");              response.setContentType("application/zip");        if (length > 0 && length <= Integer.MAX_VALUE);          response.setContentLength((int)length);        ServletOutputStream out = response.getOutputStream();      response.setBufferSize(32768);        int bufSize = response.getBufferSize();      byte[] buffer = new byte[bufSize];      BufferedInputStream bis = new BufferedInputStream(fis,bufSize);        int bytes;      while ((bytes = bis.read(buffer, 0, bufSize)) >= 0)          out.write(buffer, 0, bytes);      bis.close();            fis.close();      out.flush();      out.close();  }

In my web.xml servlet is defined and mapped as:

  <servlet>      <servlet-name>ZipFileUploadDownloadServlet</servlet-name>      <servlet-class>com.xx.xxxxx.server.servlet.FileUploadDownloadServlet</servlet-class>    </servlet>      <servlet-mapping>      <servlet-name>ZipFileUploadDownloadServlet</servlet-name>      <url-pattern>/project/FileUploadDownloadServlet</url-pattern>    </servlet-mapping>

I get the following error in pop up window: 
HTTP Status 500 - Cannot change buffer size after data has been written

I followed some threads from Google discussion group, but couldn't solve this problem. 
Would highly appreciate your reply.

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