Example usage for javax.servlet ServletOutputStream flush

List of usage examples for javax.servlet ServletOutputStream flush

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Introduction

In this page you can find the example usage for javax.servlet ServletOutputStream flush.

Prototype

public void flush() throws IOException

Source Link

Document

Flushes this output stream and forces any buffered output bytes to be written out.

Usage

From source file:org.myjerry.util.ResponseUtil.java

public static final ModelAndView sendFileToDownload(HttpServletResponse response, String fileToDownload,
        String fileName, String contentType, boolean isHttp11) throws IOException {

    response.reset();/*w  w w  .  j a v a  2 s.c  o m*/

    setNoCache(response, isHttp11);

    response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
    response.setContentType(contentType);

    ServletOutputStream out;
    out = response.getOutputStream();
    out.print(fileToDownload);
    out.flush();
    out.close();

    return null;
}

From source file:com.octo.captcha.module.web.image.ImageToJpegHelper.java

/**
 * retrieve a new ImageCaptcha using ImageCaptchaService and flush it to the response.<br/> Captcha are localized
 * using request locale.<br/>/* w  ww.j a  va  2  s .co m*/
 * <p/>
 * This method returns a 404 to the client instead of the image if the request isn't correct (missing parameters,
 * etc...)..<br/> The log may be null.<br/>
 *
 * @param theRequest  the request
 * @param theResponse the response
 * @param log         a commons logger
 * @param service     an ImageCaptchaService instance
 *
 * @throws java.io.IOException if a problem occurs during the jpeg generation process
 */
public static void flushNewCaptchaToResponse(HttpServletRequest theRequest, HttpServletResponse theResponse,
        Log log, ImageCaptchaService service, String id, Locale locale) throws IOException {

    // call the ImageCaptchaService method to retrieve a captcha
    byte[] captchaChallengeAsJpeg = null;
    ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
    try {
        BufferedImage challenge = service.getImageChallengeForID(id, locale);
        // the output stream to render the captcha image as jpeg into

        ImageIO.write(challenge, "jpg", jpegOutputStream);

    } catch (IllegalArgumentException e) {
        //    log a security warning and return a 404...
        if (log != null && log.isWarnEnabled()) {
            log.warn("There was a try from " + theRequest.getRemoteAddr()
                    + " to render an captcha with invalid ID :'" + id + "' or with a too long one");
            theResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }
    }

    captchaChallengeAsJpeg = jpegOutputStream.toByteArray();

    // render the captcha challenge as a JPEG image in the response
    theResponse.setHeader("Cache-Control", "no-store");
    theResponse.setHeader("Pragma", "no-cache");
    theResponse.setDateHeader("Expires", 0);

    theResponse.setContentType("image/jpeg");
    ServletOutputStream responseOutputStream = theResponse.getOutputStream();
    responseOutputStream.write(captchaChallengeAsJpeg);
    responseOutputStream.flush();
    responseOutputStream.close();
}

From source file:com.octo.captcha.module.web.sound.SoundToWavHelper.java

/**
 * retrieve a new SoundCaptcha using SoundCaptchaService and flush it to the response. <br/> Captcha are localized
 * using request locale. <br/>This method returns a 404 to the client instead of the image if the request isn't
 * correct (missing parameters, etc...).. <br/>The log may be null. <br/>
 *
 * @param theRequest  the request/*ww  w. ja  v  a2  s.  c  o  m*/
 * @param theResponse the response
 * @param log         a commons logger
 * @param service     an SoundCaptchaService instance
 *
 * @throws java.io.IOException if a problem occurs during the jpeg generation process
 */
public static void flushNewCaptchaToResponse(HttpServletRequest theRequest, HttpServletResponse theResponse,
        Log log, SoundCaptchaService service, String id, Locale locale) throws IOException {

    // call the ImageCaptchaService method to retrieve a captcha
    byte[] captchaChallengeAsWav = null;
    ByteArrayOutputStream wavOutputStream = new ByteArrayOutputStream();
    try {
        AudioInputStream stream = service.getSoundChallengeForID(id, locale);

        // call the ImageCaptchaService method to retrieve a captcha

        AudioSystem.write(stream, AudioFileFormat.Type.WAVE, wavOutputStream);
        //AudioSystem.(pAudioInputStream, AudioFileFormat.Type.WAVE, pFile);

    } catch (IllegalArgumentException e) {
        //    log a security warning and return a 404...
        if (log != null && log.isWarnEnabled()) {
            log.warn("There was a try from " + theRequest.getRemoteAddr()
                    + " to render an captcha with invalid ID :'" + id + "' or with a too long one");
            theResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }
    } catch (CaptchaServiceException e) {
        // log and return a 404 instead of an image...
        if (log != null && log.isWarnEnabled()) {
            log.warn(

                    "Error trying to generate a captcha and " + "render its challenge as JPEG", e);
        }
        theResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
        return;
    }
    captchaChallengeAsWav = wavOutputStream.toByteArray();

    // render the captcha challenge as a JPEG image in the response
    theResponse.setHeader("Cache-Control", "no-store");
    theResponse.setHeader("Pragma", "no-cache");
    theResponse.setDateHeader("Expires", 0);

    theResponse.setContentType("audio/x-wav");
    ServletOutputStream responseOutputStream = theResponse.getOutputStream();
    responseOutputStream.write(captchaChallengeAsWav);
    responseOutputStream.flush();
    responseOutputStream.close();
}

From source file:org.apache.jena.fuseki.servlets.ResponseJson.java

private static void output(HttpAction action, String contentType, String charset, OutputContent proc) {
    try {//w ww .ja  va 2 s . c  om
        setHttpResponse(action.request, action.response, contentType, charset);
        action.response.setStatus(HttpSC.OK_200);
        ServletOutputStream out = action.response.getOutputStream();
        try {
            proc.output(out);
            out.flush();
        } catch (QueryCancelledException ex) {
            // Bother.  Status code 200 already sent.
            xlog.info(format("[%d] Query Cancelled - results truncated (but 200 already sent)", action.id));
            out.println();
            out.println("##  Query cancelled due to timeout during execution   ##");
            out.println("##  ****          Incomplete results           ****   ##");
            out.flush();
            // No point raising an exception - 200 was sent already.  
            //errorOccurred(ex) ;
        }
        // Includes client gone.
    } catch (IOException ex) {
        ServletOps.errorOccurred(ex);
    }
    // Do not call httpResponse.flushBuffer(); here - Jetty closes the stream if it is a gzip stream
    // then the JSON callback closing details can't be added. 
}

From source file:ch.ralscha.extdirectspring.util.ExtDirectSpringUtil.java

/**
 * Checks etag and sends back HTTP status 304 if not modified. If modified sets
 * content type and content length, adds cache headers (
 * {@link #addCacheHeaders(HttpServletResponse, String, Integer)}), writes the data
 * into the {@link HttpServletResponse#getOutputStream()} and flushes it.
 *
 * @param request the HTTP servlet request
 * @param response the HTTP servlet response
 * @param data the response data//from w  ww .  ja v a2s .c om
 * @param contentType the content type of the data (i.e.
 * "application/javascript;charset=UTF-8")
 * @throws IOException
 */
public static void handleCacheableResponse(HttpServletRequest request, HttpServletResponse response,
        byte[] data, String contentType) throws IOException {
    String ifNoneMatch = request.getHeader("If-None-Match");
    String etag = "\"0" + DigestUtils.md5DigestAsHex(data) + "\"";

    if (etag.equals(ifNoneMatch)) {
        response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
        return;
    }

    response.setContentType(contentType);
    response.setContentLength(data.length);

    addCacheHeaders(response, etag, 6);

    @SuppressWarnings("resource")
    ServletOutputStream out = response.getOutputStream();
    out.write(data);
    out.flush();
}

From source file:org.jivesoftware.openfire.reporting.graph.GraphServlet.java

private static void writeImageContent(HttpServletResponse response, byte[] imageData, String contentType)
        throws IOException {
    ServletOutputStream os = response.getOutputStream();
    response.setContentType(contentType);
    os.write(imageData);/*www.j a  v a2 s.c  om*/
    os.flush();
    os.close();
}

From source file:org.apache.jena.fuseki.servlets.ResponseResultSet.java

private static void output(HttpAction action, String contentType, String charset, OutputContent proc) {
    try {// w  ww.  j av  a2 s.c om
        setHttpResponse(action.request, action.response, contentType, charset);
        action.response.setStatus(HttpSC.OK_200);
        ServletOutputStream out = action.response.getOutputStream();
        try {
            proc.output(out);
            out.flush();
        } catch (QueryCancelledException ex) {
            // Bother.  Status code 200 already sent.
            slog.info(format("[%d] Query Cancelled - results truncated (but 200 already sent)", action.id));
            out.println();
            out.println("##  Query cancelled due to timeout during execution   ##");
            out.println("##  ****          Incomplete results           ****   ##");
            out.flush();
            // No point raising an exception - 200 was sent already.  
            //errorOccurred(ex) ;
        }
        // Includes client gone.
    } catch (IOException ex) {
        errorOccurred(ex);
    }
    // Do not call httpResponse.flushBuffer(); here - Jetty closes the stream if it is a gzip stream
    // then the JSON callback closing details can't be added. 
}

From source file:com.ikon.util.WebUtils.java

/**
 * Send file to client browser./*from w  w  w . j ava 2  s.c  o  m*/
 * 
 * @throws IOException If there is a communication error.
 */
public static void sendFile(HttpServletRequest request, HttpServletResponse response, String fileName,
        String mimeType, boolean inline, InputStream is) throws IOException {
    log.debug("sendFile({}, {}, {}, {}, {}, {})",
            new Object[] { request, response, fileName, mimeType, inline, is });
    prepareSendFile(request, response, fileName, mimeType, inline);

    // Set length
    response.setContentLength(is.available());
    log.debug("File: {}, Length: {}", fileName, is.available());

    ServletOutputStream sos = response.getOutputStream();
    IOUtils.copy(is, sos);
    sos.flush();
    sos.close();
}

From source file:com.ikon.util.WebUtils.java

/**
 * Send file to client browser./*from  ww  w.ja  v  a2  s  .  co  m*/
 * 
 * @throws IOException If there is a communication error.
 */
public static void sendFile(HttpServletRequest request, HttpServletResponse response, String fileName,
        String mimeType, boolean inline, File input) throws IOException {
    log.debug("sendFile({}, {}, {}, {}, {}, {})",
            new Object[] { request, response, fileName, mimeType, inline, input });
    prepareSendFile(request, response, fileName, mimeType, inline);

    // Set length
    response.setContentLength((int) input.length());
    log.debug("File: {}, Length: {}", fileName, input.length());

    ServletOutputStream sos = response.getOutputStream();
    FileUtils.copy(input, sos);
    sos.flush();
    sos.close();
}

From source file:org.openmrs.module.idcards.web.servlet.PrintEmptyIdcardsServlet.java

/**
 * Write the pdf to the given response/*from  w  ww  .ja v a2s  .c  o  m*/
 */
@SuppressWarnings("unchecked")
public static void generateOutputForIdentifiers(IdcardsTemplate card, String baseURL,
        HttpServletResponse response, List<String> identifiers, String password)
        throws ServletException, IOException {

    Properties props = new Properties();
    props.setProperty(RuntimeConstants.RESOURCE_LOADER, "class");
    props.setProperty("class.resource.loader.description", "VelocityClasspathResourceLoader");
    props.setProperty("class.resource.loader.class",
            "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
    props.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS,
            "org.apache.velocity.runtime.log.NullLogSystem");

    // do the velocity magic
    Writer writer = new StringWriter();
    try {
        // Allow images to be served from Unix servers.
        try {
            java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment();
        } catch (Throwable t) {
            log.warn(
                    "Unable to get graphics environment.  "
                            + "Make sure that -Djava.awt.headless=true is defined as a JAVA OPT during startup",
                    t);
        }
        Velocity.init(props);
        VelocityContext velocityContext = new VelocityContext();
        velocityContext.put("locale", Context.getLocale());
        velocityContext.put("identifiers", identifiers);
        velocityContext.put("baseURL", baseURL);
        Velocity.evaluate(velocityContext, writer, PrintEmptyIdcardsServlet.class.getName(), card.getXml());
    } catch (ParseErrorException e) {
        throw new ServletException("Error parsing template: ", e);
    } catch (MethodInvocationException e) {
        throw new ServletException("Error parsing template: ", e);
    } catch (ResourceNotFoundException e) {
        throw new ServletException("Error parsing template: ", e);
    } catch (Exception e) {
        throw new ServletException("Error initializing Velocity engine", e);
    } finally {
        System.gc();
    }

    try {
        //Setup a buffer to obtain the content length
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        FopFactory fopFactory = FopFactory.newInstance();

        //fopFactory supports customization with a config file
        //Load the config file before creating the user agent.
        String userConfigFile = Context.getAdministrationService()
                .getGlobalProperty("idcards.fopConfigFilePath");
        if (userConfigFile != null) {
            try {
                fopFactory.setUserConfig(new java.io.File(userConfigFile));
                log.debug("Successfully loaded config file |" + userConfigFile + "|");
            } catch (Exception e) {
                log.error("Could not initialize fopFactory user config with file at " + userConfigFile
                        + ". Error message:" + e.getMessage());
            }
        }

        FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
        foUserAgent.getRendererOptions().put("encryption-params",
                new PDFEncryptionParams(password, null, true, false, false, false));

        //Setup FOP
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);

        //Setup Transformer
        Source xsltSrc = new StreamSource(new StringReader(card.getXslt()));
        TransformerFactory tFactory = TransformerFactory.newInstance();
        Transformer transformer = tFactory.newTransformer(xsltSrc);

        //Make sure the XSL transformation's result is piped through to FOP
        Result res = new SAXResult(fop.getDefaultHandler());

        //Setup input
        String xml = writer.toString();
        Source src = new StreamSource(new StringReader(xml));

        //Start the transformation and rendering process
        transformer.transform(src, res);

        //Prepare response
        String time = new SimpleDateFormat("yyyy-MM-dd_Hms").format(new Date());
        String filename = card.getName().replace(" ", "_") + "-" + time + ".pdf";
        response.setHeader("Content-Disposition", "attachment; filename=" + filename);
        response.setContentType("application/pdf");
        response.setContentLength(out.size());

        //Send content to Browser
        ServletOutputStream outputStream = response.getOutputStream();
        outputStream.write(out.toByteArray());
        outputStream.flush();
    } catch (FOPException e) {
        throw new ServletException("Error generating report", e);
    } catch (TransformerConfigurationException e) {
        throw new ServletException("Error generating report", e);
    } catch (TransformerException e) {
        throw new ServletException("Error generating report", e);
    }
}