Sending OutputStream to browser and browser resolution

Question

I want to export data from a Rich Faces data table. I created an outputStream from the data in the data table. Now you want to send this OutputStream to the browser and save it. How can i do this?

FileOutputStream stream = new FileOutputStream(new File(PATH));

OutputStream out = myMthodToCreateOutPutStream();

Now how to save this out in the browser.

Answer 1

It is not clear where you are reading your data from. You need to create an InputStream to read the data.

Then you first need to configure the response headers to

 HttpServletResponse.setHeader("Content-Disposition", "attachment; filename=datafile.xls"); 

Use any file name you need.

Then set the mime type:

 response.setContentType("application/vnd.ms-excel"); 

Use the desired mime type.

Then you need to use the response object to get its output stream -

 OutputStream outStream = response.getOutputStream(); 

Now write to him:

 byte[] buf = new byte[4096]; int len = -1; //Write the file contents to the servlet response //Using a buffer of 4kb (configurable). This can be //optimized based on web server and app server //properties while ((len = inStream.read(buf)) != -1) { outStream.write(buf, 0, len); } outStream.flush(); outStream.close();