Example usage for javax.servlet.http HttpServletResponse reset

Introduction

In this page you can find the example usage for javax.servlet.http HttpServletResponse reset.

Prototype

public void reset();

Source Link

Document

Clears any data that exists in the buffer as well as the status code, headers.

Usage

From source file:org.sakaiproject.umem.tool.ui.Export.java

/**
 * Try to head off a problem with downloading files from a secure HTTPS
 * connection to Internet Explorer. When IE sees it's talking to a secure
 * server, it decides to treat all hints or instructions about caching as
 * strictly as possible. Immediately upon finishing the download, it throws
 * the data away. Unfortunately, the way IE sends a downloaded file on to a
 * helper application is to use the cached copy. Having just deleted the
 * file, it naturally isn't able to find it in the cache. Whereupon it
 * delivers a very misleading error message like: "Internet Explorer cannot
 * download roster from sakai.yoursite.edu. Internet Explorer was not able
 * to open this Internet site. The requested site is either unavailable or
 * cannot be found. Please try again later." There are several ways to turn
 * caching off, and so to be safe we use several ways to turn it back on
 * again. This current workaround should let IE users save the files to
 * disk. Unfortunately, errors may still occur if a user attempts to open
 * the file directly in a helper application from a secure web server. TODO
 * Keep checking on the status of this./*from   w  ww .  j  a v  a 2 s.  com*/
 */
public static void protectAgainstInstantDeletion(HttpServletResponse response) {
    response.reset(); // Eliminate the added-on stuff
    response.setHeader("Pragma", "public"); // Override old-style cache
    // control
    response.setHeader("Cache-Control", "public, must-revalidate, post-check=0, pre-check=0, max-age=0"); // New-style
}

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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();

    setNoCache(response, isHttp11);/*from ww w .  jav a2s. c o  m*/

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

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

    return null;
}

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From source file:com.usefullc.platform.common.utils.IOUtils.java

/**
 * /*from   w  ww  .  j a v  a2  s .  co m*/
 * 
 * @param content
 * @param fileName
 * @param response
 */
public static void download(byte[] content, String fileName, HttpServletResponse response) {
    try {
        // response
        response.reset();

        // ??linux ?  linux utf-8,windows  GBK)
        String defaultEncoding = System.getProperty("file.encoding");
        if (defaultEncoding != null && defaultEncoding.equals("UTF-8")) {

            response.addHeader("Content-Disposition",
                    "attachment;filename=" + new String(fileName.getBytes("GBK"), "iso-8859-1"));
        } else {
            response.addHeader("Content-Disposition",
                    "attachment;filename=" + new String(fileName.getBytes(), "iso-8859-1"));
        }

        // responseHeader
        response.addHeader("Content-Length", "" + content.length);
        response.setContentType("application/octet-stream");
        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        toClient.write(content);
        toClient.flush();
        toClient.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

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From source file:com.eryansky.common.web.utils.DownloadUtils.java

/**
 * /*from w  w w . j a v  a  2 s . c  o m*/
 * @param request
 * @param response
 * @param inputStream ?
 * @param displayName ??
 * @throws IOException
 */
public static void download(HttpServletRequest request, HttpServletResponse response, InputStream inputStream,
        String displayName) throws IOException {
    response.reset();
    WebUtils.setNoCacheHeader(response);

    response.setContentType("application/x-download");
    response.setContentLength((int) inputStream.available());

    //        String displayFilename = displayName.substring(displayName.lastIndexOf("_") + 1);
    //        displayFilename = displayFilename.replace(" ", "_");
    WebUtils.setDownloadableHeader(request, response, displayName);
    BufferedInputStream is = null;
    OutputStream os = null;
    try {

        os = response.getOutputStream();
        is = new BufferedInputStream(inputStream);
        IOUtils.copy(is, os);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        IOUtils.closeQuietly(is);
    }
}

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From source file:com.iyonger.apm.web.util.FileDownloadUtils.java

/**
 * Download the given file to the given {@link HttpServletResponse}.
 *
 * @param response {@link HttpServletResponse}
 * @param file     file path//from   w w w. j av a 2s.  c o m
 * @return true if succeeded
 */
public static boolean downloadFile(HttpServletResponse response, File file) {
    if (file == null || !file.exists()) {
        return false;
    }
    boolean result = true;
    response.reset();
    response.addHeader("Content-Disposition", "attachment;filename=" + file.getName());
    response.setContentType("application/octet-stream");
    response.addHeader("Content-Length", "" + file.length());
    InputStream fis = null;
    byte[] buffer = new byte[FILE_DOWNLOAD_BUFFER_SIZE];
    OutputStream toClient = null;
    try {
        fis = new BufferedInputStream(new FileInputStream(file));
        toClient = new BufferedOutputStream(response.getOutputStream());
        int readLength;
        while (((readLength = fis.read(buffer)) != -1)) {
            toClient.write(buffer, 0, readLength);
        }
        toClient.flush();
    } catch (FileNotFoundException e) {
        LOGGER.error("file not found:" + file.getAbsolutePath(), e);
        result = false;
    } catch (IOException e) {
        LOGGER.error("read file error:" + file.getAbsolutePath(), e);
        result = false;
    } finally {
        IOUtils.closeQuietly(fis);
        IOUtils.closeQuietly(toClient);
    }
    return result;
}

---

From source file:com.mtt.myapp.common.util.FileDownloadUtil.java

/**
 * Provide file download from the given file path.
 * @param response {@link javax.servlet.http.HttpServletResponse}
 * @param desFile file path/*  ww w  .ja  va  2 s.co  m*/
 * @return true if succeeded
 */
public static boolean downloadFile(HttpServletResponse response, File desFile) {
    if (desFile == null || !desFile.exists()) {
        return false;
    }
    boolean result = true;
    response.reset();
    response.addHeader("Content-Disposition", "attachment;filename=" + desFile.getName());
    response.setContentType("application/octet-stream");
    response.addHeader("Content-Length", "" + desFile.length());
    InputStream fis = null;
    byte[] buffer = new byte[FILE_DOWNLOAD_BUFFER_SIZE];
    OutputStream toClient = null;
    try {
        fis = new BufferedInputStream(new FileInputStream(desFile));
        toClient = new BufferedOutputStream(response.getOutputStream());
        int readLength;
        while (((readLength = fis.read(buffer)) != -1)) {
            toClient.write(buffer, 0, readLength);
        }
        toClient.flush();
    } catch (FileNotFoundException e) {
        LOGGER.error("file not found:" + desFile.getAbsolutePath(), e);
        result = false;
    } catch (IOException e) {
        LOGGER.error("read file error:" + desFile.getAbsolutePath(), e);
        result = false;
    } finally {
        IOUtils.closeQuietly(fis);
        IOUtils.closeQuietly(toClient);
    }
    return result;
}

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From source file:fiftyone.mobile.detection.webapp.JavascriptProvider.java

static void sendJavaScript(HttpServletRequest request, HttpServletResponse response, Dataset dataSet,
        StringBuilder javascript) throws IOException {

    response.reset();
    response.setContentType("application/x-javascript");
    response.setCharacterEncoding("UTF-8");
    response.setHeader("Vary", "User-Agent");
    response.setHeader("Cache-Control", "public");
    response.setHeader("Expires", dataSet.nextUpdate.toString());
    response.setHeader("Last-Modified", dataSet.published.toString());
    try {//from w w  w .java2 s  .co m
        response.setHeader("ETag", eTagHash(dataSet, request));
    } catch (Exception ex) {
        // The response doesn't support eTags. Nothing we can do.
    }
    response.setBufferSize(DEFAULT_BUFFER_SIZE);
    response.setHeader("Content-Length", Integer.toString(javascript.length()));

    response.getOutputStream().println(javascript.toString());
    response.getOutputStream().flush();
    response.getOutputStream().close();
}

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From source file:com.zving.platform.SysInfo.java

public static void downloadDB(HttpServletRequest request, HttpServletResponse response) {
    try {/* w  w w . java2 s. c  o  m*/
        request.setCharacterEncoding(Constant.GlobalCharset);
        response.reset();
        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition",
                "attachment; filename=DB_" + DateUtil.getCurrentDate("yyyyMMddHHmmss") + ".dat");
        OutputStream os = response.getOutputStream();

        String path = Config.getContextRealPath() + "WEB-INF/data/backup/DB_"
                + DateUtil.getCurrentDate("yyyyMMddHHmmss") + ".dat";
        new DBExport().exportDB(path);

        byte[] buffer = new byte[1024];
        int read = -1;
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(path);
            while ((read = fis.read(buffer)) != -1)
                if (read > 0) {
                    byte[] chunk = (byte[]) null;
                    if (read == 1024) {
                        chunk = buffer;
                    } else {
                        chunk = new byte[read];
                        System.arraycopy(buffer, 0, chunk, 0, read);
                    }
                    os.write(chunk);
                    os.flush();
                }
        } finally {
            if (fis != null) {
                fis.close();
            }
        }
        os.flush();
        os.close();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:com.lushapp.common.web.utils.DownloadUtils.java

public static void download(HttpServletRequest request, HttpServletResponse response, String displayName,
        byte[] bytes) throws IOException {

    if (ArrayUtils.isEmpty(bytes)) {
        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        response.getWriter().write("??");
        return;/*from www  .j  ava  2s . c  o m*/
    }

    response.reset();
    WebUtils.setNoCacheHeader(response);

    response.setContentType("application/x-download");
    response.setContentLength((int) bytes.length);

    String displayFilename = displayName.substring(displayName.lastIndexOf("_") + 1);
    displayFilename = displayFilename.replace(" ", "_");
    WebUtils.setDownloadableHeader(request, response, displayFilename);
    BufferedInputStream is = null;
    OutputStream os = null;
    try {

        os = response.getOutputStream();
        is = new BufferedInputStream(new ByteArrayInputStream(bytes));
        IOUtils.copy(is, os);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        IOUtils.closeQuietly(is);
    }
}

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From source file:com.lushapp.common.web.utils.DownloadUtils.java

public static void download(HttpServletRequest request, HttpServletResponse response, String filePath,
        String displayName) throws IOException {
    File file = new File(filePath);

    if (StringUtils.isEmpty(displayName)) {
        displayName = file.getName();//from  w  w w .ja  v  a  2s  . co m
    }

    if (!file.exists() || !file.canRead()) {
        response.setContentType("text/html;charset=utf-8");
        response.getWriter().write("??");
        return;
    }

    response.reset();
    WebUtils.setNoCacheHeader(response);

    response.setContentType("application/x-download");
    response.setContentLength((int) file.length());

    String displayFilename = displayName.substring(displayName.lastIndexOf("_") + 1);
    displayFilename = displayFilename.replace(" ", "_");
    WebUtils.setDownloadableHeader(request, response, displayFilename);
    BufferedInputStream is = null;
    OutputStream os = null;
    try {

        os = response.getOutputStream();
        is = new BufferedInputStream(new FileInputStream(file));
        IOUtils.copy(is, os);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        IOUtils.closeQuietly(is);
    }
}

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