Combine 2 content types in a servlet

Greenhorn

Posts: 10

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Hi all i start learning servlets now and i have a question about how can in one servlet send an html page and a file such as a photo in the response.I have this servlet :

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class CodeFile extends HttpServlet {
 
 @Override
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
 
 
 response.setContentType("text/html");
 
 
 PrintWriter out = response.getWriter();
 String client = request.getHeader("User-Agent");
 String httpmethod = request.getMethod();
 HttpSession session = request.getSession();
 
 
 out.println("<html>" +
 "<body>" +
 "<h1 style=�text-align:center>" +
 "Thank you for Testing</h1>" +
 " " +
 "From browser" + client +
 " " +
 "Ussing "+ httpmethod + " Http Method"+
 " " +
 "Associated session with your request "+ session +
 " " +
 "Admin Email "+ getServletConfig().getInitParameter("adminemail") +
 "</body>" +
 "</html>"); 
 
 ServletContext ctx = getServletContext();
 InputStream is = ctx.getResourceAsStream("/ch4/gi.jpg");
 
 int read = 0;
 byte[] bytes = new byte[1024];
 
 OutputStream os = response.getOutputStream();
 while ((read = is.read(bytes)) != -1) {
 os.write(bytes, 0, read);
 }
 os.flush();
 os.close();
 
 }
 
}

It runs but i get only the html page without downloading the file.Now i wonder if i have to make a second servlet for the file but then how can i do this.Any suggestions?

Steve Luke

Bartender

Posts: 4179

I like...

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

You can't send two different content types over a single response. You will need two response, which means you will need two different requests (as responses can only be sent after a request was made).

The easiest way is probably to have the HTML page you send trigger the second response, either using javascript or an internal frame (iframe) to send a request to a second servlet that then initiates the download.

Steve