Question

I have a extJs form with fileupload and servlet. After uploading file i want to get response from servlet.

i do this System.out.println("{success:true, error:'error'}");
But in firebug in POST i dont see anything. This code works in case wiht jsp but not servlet. So how to send parametrs from servlet?

Answer 1

System.out PrintStream is not the the output stream of your servlet response. It is still the “standard” system out stream. Most application servers redirect that to a log file.

Servlet’s service() method, as well as do*() methods of HttpServlet, take ServletResponse respectively HttpServletResponse as a parameter. When implementing a servlet, one can call getWriter() on that parameter to get a PrintWriter open on response’s output stream. That can be used to print something to the response.

So, your code should be something like:

response.getWriter().println("{success:true, error:'error'}");