import java.io.*; import java.net.*; import javax.servlet.*; import javax.servlet.http.*; public class RenderPDF extends HttpServlet { public void doPost( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException { doGet( req, res ); } public void doGet( HttpServletRequest req, HttpServletResponse res ) throws ServletException, IOException { ServletOutputStream out = res.getOutputStream( ); BufferedInputStream bin = null; BufferedOutputStream bout = null; String file = req.getParameter( "file" ); try { URL url = new URL( "http://localhost:8080/" + file + ".pdf" ); // Use Buffered Stream for reading/writing. bin = new BufferedInputStream( url.openStream( ) ); bout = new BufferedOutputStream( out ); byte[ ] buff = new byte[ 2048 ]; int bytesRead; res.setContentType( "application/pdf" ); res.setHeader( "Content-disposition", "attachment; filename=" + file + ".pdf" ); // Copy, using bulk operations while( (bytesRead = bin.read( buff, 0, buff.length ) ) != -1 ) bout.write( buff, 0, bytesRead ); } catch( IOException e ) { res.setContentType( "text/html" ); PrintWriter pw = new PrintWriter( out, true ); pw.println( "

" );
            e.printStackTrace( pw );
            pw.println( "

" ); } finally { if( bin != null ) bin.close( ); if( out != null ) out.close( ); } } }