Examples of MultipartResponse

com.oreilly.servlet.MultipartResponse

A utility class to generate multipart/x-mixed-replace responses, the kind of responses that implement server push. Note that Microsoft Internet Explorer does not understand this sort of response.

To use this class, first construct a new MultipartResponse passing to its constructor the servlet's response parameter. MultipartResponse uses the response object to fetch the servlet's output stream and to set the response's content type.

Then, for each page of content, begin by calling startResponse() passing in the content type for that page. Send the content for the page by writing to the output stream as usual. A call to endResponse() ends the page and flushes the content so the client can see it. At this point a sleep() or other delay can be added until the next page is ready for sending.

The call to endResponse() is optional. The startResponse() method knows whether the last response has been ended, and ends it itself if necessary. However, it's wise to call endResponse() if there's to be a delay between the time one response ends and the next begins. It lets the client display the latest response during the time it waits for the next one.

Finally, after each response page has been sent, a call to the finish() method finishes the multipart response and sends a code telling the client there will be no more responses.

For example:

 MultipartResponse multi = new MultipartResponse(res);   multi.startResponse("text/plain"); out.println("On your mark"); multi.endResponse();   try { Thread.sleep(1000); } catch (InterruptedException e) { }   multi.startResponse("text/plain"); out.println("Get set"); multi.endResponse();   try { Thread.sleep(1000); } catch (InterruptedException e) { }   multi.startResponse("image/gif"); ServletUtils.returnFile(req.getRealPath("/images/go.gif"), out);   multi.finish();

org.mortbay.servlet.MultiPartResponse

org.openqa.jetty.http.MultiPartResponse

Handle a multipart MIME response. @version $Id: MultiPartResponse.java,v 1.12 2006/04/04 22:28:02 gregwilkins Exp $ @author Greg Wilkins @author Jim Crossley

        // content-length header
        //
        writeHeaders(response, resource, -1);
        ResourceCache.ResourceMetaData metaData = _httpContext.getResourceMetaData(resource);
        String encoding = metaData.getMimeType();
        MultiPartResponse multi = new MultiPartResponse(response.getOutputStream());
        response.setStatus(HttpResponse.__206_Partial_Content);


        // If the request has a "Request-Range" header then we need to
        // send an old style multipart/x-byteranges Content-Type. This
        // keeps Netscape and acrobat happy. This is what Apache does.
        String ctp;
        if (request.getHeader(HttpFields.__RequestRange) != null)
            ctp = "multipart/x-byteranges; boundary=";
        else
            ctp = "multipart/byteranges; boundary=";
        response.setContentType(ctp + multi.getBoundary());


        InputStream in = (resource instanceof CachedResource) ? null : resource.getInputStream();
        long pos = 0;


        for (int i = 0; i < ranges.size(); i++)
        {
            InclusiveByteRange ibr = (InclusiveByteRange) ranges.get(i);
            String header = HttpFields.__ContentRange + ": " + ibr.toHeaderRangeString(resLength);
            multi.startPart(encoding, new String[]
            { header});


            long start = ibr.getFirst(resLength);
            long size = ibr.getSize(resLength);
            if (in != null)
            {
                // Handle non cached resource
                if (start < pos)
                {
                    in.close();
                    in = resource.getInputStream();
                    pos = 0;
                }
                if (pos < start)
                {
                    in.skip(start - pos);
                    pos = start;
                }
                IO.copy(in, out, size);
                pos += size;
            }
            else
                // Handle cached resource
                (resource).writeTo(out, start, size);


        }
        if (in != null)
            in.close();
        multi.close();


        return;
    }

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Examples of MultipartResponse

Examples of org.openqa.jetty.http.MultiPartResponse