Example usage for java.net URLConnection getLastModified

List of usage examples for java.net URLConnection getLastModified

  1. HOME
  2. Java
  3. java
  4. java.net.*
  5. URLConnection
  6. getLastModified

Introduction

In this page you can find the example usage for java.net URLConnection getLastModified.

Prototype

public long getLastModified()

Source Link

Document

Returns the value of the last-modified header field.

Usage

From source file:com.apache.ivy.BasicURLHandler.java

public URLInfo getURLInfo(URL url, int timeout) {
    // Install the IvyAuthenticator
    if ("http".equals(url.getProtocol()) || "https".equals(url.getProtocol())) {
        IvyAuthenticator.install();// w w  w.  j  a  v a2  s .  c  om
    }

    URLConnection con = null;
    try {
        url = normalizeToURL(url);
        con = url.openConnection();
        con.setRequestProperty("User-Agent", "Apache Ivy/1.0");//+ Ivy.getIvyVersion());
        if (con instanceof HttpURLConnection) {
            HttpURLConnection httpCon = (HttpURLConnection) con;
            if (getRequestMethod() == URLHandler.REQUEST_METHOD_HEAD) {
                httpCon.setRequestMethod("HEAD");
            }
            if (checkStatusCode(url, httpCon)) {
                String bodyCharset = getCharSetFromContentType(con.getContentType());
                return new URLInfo(true, httpCon.getContentLength(), con.getLastModified(), bodyCharset);
            }
        } else {
            int contentLength = con.getContentLength();
            if (contentLength <= 0) {
                return UNAVAILABLE;
            } else {
                // TODO: not HTTP... maybe we *don't* want to default to ISO-8559-1 here?
                String bodyCharset = getCharSetFromContentType(con.getContentType());
                return new URLInfo(true, contentLength, con.getLastModified(), bodyCharset);
            }
        }
    } catch (UnknownHostException e) {
        // Message.warn("Host " + e.getMessage() + " not found. url=" + url);
        // Message.info("You probably access the destination server through "
        //    + "a proxy server that is not well configured.");
    } catch (IOException e) {
        //Message.error("Server access error at url " + url, e);
    } finally {
        disconnect(con);
    }
    return UNAVAILABLE;
}

From source file:com.google.gwt.dev.shell.GWTShellServlet.java

/**
 * Fetch a file and return it as the HTTP response, setting the cache-related
 * headers according to the name of the file (see
 * {@link #getCacheTime(String)}). This function honors If-Modified-Since to
 * minimize the impact of limiting caching of files for development.
 * /*from  w ww  .  j av  a  2 s . com*/
 * @param request the HTTP request
 * @param response the HTTP response
 * @param logger a TreeLogger to use for debug output
 * @param partialPath the path within the module
 * @param moduleName the name of the module
 * @throws IOException
 */
@SuppressWarnings("deprecation")
private void doGetPublicFile(HttpServletRequest request, HttpServletResponse response, TreeLogger logger,
        String partialPath, String moduleName) throws IOException {

    // Create a logger branch for this request.
    logger = logger.branch(TreeLogger.TRACE, "The development shell servlet received a request for '"
            + partialPath + "' in module '" + moduleName + ".gwt.xml' ", null);

    // Handle auto-generation of resources.
    if (shouldAutoGenerateResources()) {
        if (autoGenerateResources(request, response, logger, partialPath, moduleName)) {
            return;
        }
    }

    URL foundResource = null;
    try {
        // Look for the requested file on the public path.
        //
        ModuleDef moduleDef = getModuleDef(logger, moduleName);
        if (shouldAutoGenerateResources()) {
            Resource publicResource = moduleDef.findPublicFile(partialPath);
            if (publicResource != null) {
                foundResource = publicResource.getURL();
            }

            if (foundResource == null) {
                // Look for public generated files
                File shellDir = getShellWorkDirs().getShellPublicGenDir(moduleDef);
                File requestedFile = new File(shellDir, partialPath);
                if (requestedFile.exists()) {
                    try {
                        foundResource = requestedFile.toURI().toURL();
                    } catch (MalformedURLException e) {
                        // ignore since it was speculative anyway
                    }
                }
            }
        }

        /*
         * If the user is coming from compiled web-mode, check the linker output
         * directory for the real bootstrap file.
         */
        if (foundResource == null) {
            File moduleDir = getShellWorkDirs().getCompilerOutputDir(moduleDef);
            File requestedFile = new File(moduleDir, partialPath);
            if (requestedFile.exists()) {
                try {
                    foundResource = requestedFile.toURI().toURL();
                } catch (MalformedURLException e) {
                    // ignore since it was speculative anyway
                }
            }
        }

        if (foundResource == null) {
            String msg;
            if ("gwt.js".equals(partialPath)) {
                msg = "Loading the old 'gwt.js' bootstrap script is no longer supported; please load '"
                        + moduleName + ".nocache.js' directly";
            } else {
                msg = "Resource not found: " + partialPath + "; "
                        + "(could a file be missing from the public path or a <servlet> "
                        + "tag misconfigured in module " + moduleName + ".gwt.xml ?)";
            }
            logger.log(TreeLogger.WARN, msg, null);
            throw new UnableToCompleteException();
        }
    } catch (UnableToCompleteException e) {
        sendErrorResponse(response, HttpServletResponse.SC_NOT_FOUND,
                "Cannot find resource '" + partialPath + "' in the public path of module '" + moduleName + "'");
        return;
    }

    // Get the MIME type.
    String path = foundResource.toExternalForm();
    String mimeType = null;
    try {
        mimeType = getServletContext().getMimeType(path);
    } catch (UnsupportedOperationException e) {
        // Certain minimalist servlet containers throw this.
        // Fall through to guess the type.
    }

    if (mimeType == null) {
        mimeType = guessMimeType(path);
        if (logger.isLoggable(TreeLogger.TRACE)) {
            logger.log(TreeLogger.TRACE, "Guessed MIME type '" + mimeType + "'", null);
        }
    }

    maybeIssueXhtmlWarning(logger, mimeType, partialPath);

    long cacheSeconds = getCacheTime(path);

    InputStream is = null;
    try {
        // Check for up-to-datedness.
        URLConnection conn = foundResource.openConnection();
        long lastModified = conn.getLastModified();
        if (isNotModified(request, lastModified)) {
            response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
            setResponseCacheHeaders(response, cacheSeconds);
            return;
        }

        // Set up headers to really send it.
        response.setStatus(HttpServletResponse.SC_OK);
        long now = new Date().getTime();
        response.setHeader(HttpHeaders.DATE, HttpHeaders.toInternetDateFormat(now));
        response.setContentType(mimeType);
        String lastModifiedStr = HttpHeaders.toInternetDateFormat(lastModified);
        response.setHeader(HttpHeaders.LAST_MODIFIED, lastModifiedStr);

        // Expiration header. Either immediately stale (requiring an
        // "If-Modified-Since") or infinitely cacheable (not requiring even a
        // freshness check).
        setResponseCacheHeaders(response, cacheSeconds);

        // Content length.
        int contentLength = conn.getContentLength();
        if (contentLength >= 0) {
            response.setHeader(HttpHeaders.CONTENT_LENGTH, Integer.toString(contentLength));
        }

        // Send the bytes.
        is = conn.getInputStream();
        streamOut(is, response.getOutputStream(), 1024 * 8);
    } finally {
        Utility.close(is);
    }
}

From source file:org.wso2.carbon.mediation.registry.ESBRegistry.java

public RegistryEntry getRegistryEntry(String key) {

    // get information from the actual resource
    MediationRegistryEntryImpl entryEmbedded = new MediationRegistryEntryImpl();

    try {/*w ww .j a v a  2  s.co  m*/
        URL url = new URL(getRoot() + key);
        if ("file".equals(url.getProtocol())) {
            try {
                url.openStream();
            } catch (IOException ignored) {
                if (!localRegistry.endsWith(URL_SEPARATOR)) {
                    localRegistry = localRegistry + URL_SEPARATOR;
                }
                url = new URL(url.getProtocol() + ":" + localRegistry + key);
                try {
                    url.openStream();
                } catch (IOException e) {
                    return null;
                }
            }
        }
        URLConnection urlc = url.openConnection();

        entryEmbedded.setKey(key);
        entryEmbedded.setName(url.getFile());
        entryEmbedded.setType(ESBRegistryConstants.FILE);

        entryEmbedded.setDescription("Resource at : " + url.toString());
        entryEmbedded.setLastModified(urlc.getLastModified());
        entryEmbedded.setVersion(urlc.getLastModified());
        if (urlc.getExpiration() > 0) {
            entryEmbedded.setCachableDuration(urlc.getExpiration() - System.currentTimeMillis());
        } else {
            entryEmbedded.setCachableDuration(getCachableDuration());
        }

    } catch (MalformedURLException e) {
        handleException("Invalid URL reference " + getRoot() + key, e);
    } catch (IOException e) {
        handleException("IO Error reading from URL " + getRoot() + key, e);
    }

    // get information from the database
    PersistenceManager persistenceManager = PersistenceManager.getInstance();
    RegistryEntryDO registryEntryDO = persistenceManager.getRegistryEntry(key);

    if (registryEntryDO != null) {

        if (registryEntryDO.getExpiryTime() != null) {
            entryEmbedded.setCachableDuration(registryEntryDO.getExpiryTime());
        } else {
            entryEmbedded.setCachableDuration(0);
        }
    }

    return entryEmbedded;
}

From source file:org.wso2.carbon.mediation.registry.MicroIntegratorRegistry.java

@Override
public RegistryEntry getRegistryEntry(String key) {

    // get information from the actual resource
    MediationRegistryEntryImpl entryEmbedded = new MediationRegistryEntryImpl();

    try {/*from  w w w  .jav a 2  s .co m*/
        URL url = new URL(resolveRegistryPath(key));
        if ("file".equals(url.getProtocol())) {
            try {
                url.openStream();
            } catch (IOException e) {
                log.error("Error occurred while accessing registry resource: " + key, e);
                return null;
            }
        }
        URLConnection urlc = url.openConnection();

        entryEmbedded.setKey(key);
        entryEmbedded.setName(url.getFile());
        entryEmbedded.setType(ESBRegistryConstants.FILE);
        entryEmbedded.setDescription("Resource at : " + url.toString());
        entryEmbedded.setLastModified(urlc.getLastModified());
        entryEmbedded.setVersion(urlc.getLastModified());

        if (urlc.getExpiration() > 0) {
            entryEmbedded.setCachableDuration(urlc.getExpiration() - System.currentTimeMillis());
        } else {
            entryEmbedded.setCachableDuration(getCachableDuration());
        }

    } catch (MalformedURLException e) {
        handleException("Invalid URL reference " + resolveRegistryPath(key), e);
    } catch (IOException e) {
        handleException("IO Error reading from URL " + resolveRegistryPath(key), e);
    }

    return entryEmbedded;
}

From source file:org.apache.felix.webconsole.AbstractWebConsolePlugin.java

/**
 * If the request addresses a resource which may be served by the
 * <code>getResource</code> method of the
 * {@link #getResourceProvider() resource provider}, this method serves it
 * and returns <code>true</code>. Otherwise <code>false</code> is returned.
 * <code>false</code> is also returned if the resource provider has no
 * <code>getResource</code> method.
 * <p>/*  w w  w  . j av  a 2 s  .  com*/
 * If <code>true</code> is returned, the request is considered complete and
 * request processing terminates. Otherwise request processing continues
 * with normal plugin rendering.
 *
 * @param request The request object
 * @param response The response object
 * @return <code>true</code> if the request causes a resource to be sent back.
 *
 * @throws IOException If an error occurs accessing or spooling the resource.
 */
private final boolean spoolResource(HttpServletRequest request, HttpServletResponse response)
        throws IOException {
    // no resource if no resource accessor
    Method getResourceMethod = getGetResourceMethod();
    if (getResourceMethod == null) {
        return false;
    }

    String pi = request.getPathInfo();
    InputStream ins = null;
    try {

        // check for a resource, fail if none
        URL url = (URL) getResourceMethod.invoke(getResourceProvider(), new Object[] { pi });
        if (url == null) {
            return false;
        }

        // open the connection and the stream (we use the stream to be able
        // to at least hint to close the connection because there is no
        // method to explicitly close the conneciton, unfortunately)
        URLConnection connection = url.openConnection();
        ins = connection.getInputStream();

        // FELIX-2017 Equinox may return an URL for a non-existing
        // resource but then (instead of throwing) return null on
        // getInputStream. We should account for this situation and
        // just assume a non-existing resource in this case.
        if (ins == null) {
            return false;
        }

        // check whether we may return 304/UNMODIFIED
        long lastModified = connection.getLastModified();
        if (lastModified > 0) {
            long ifModifiedSince = request.getDateHeader("If-Modified-Since");
            if (ifModifiedSince >= (lastModified / 1000 * 1000)) {
                // Round down to the nearest second for a proper compare
                // A ifModifiedSince of -1 will always be less
                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);

                return true;
            }

            // have to send, so set the last modified header now
            response.setDateHeader("Last-Modified", lastModified);
        }

        // describe the contents
        response.setContentType(getServletContext().getMimeType(pi));
        response.setIntHeader("Content-Length", connection.getContentLength());

        // spool the actual contents
        OutputStream out = response.getOutputStream();
        byte[] buf = new byte[2048];
        int rd;
        while ((rd = ins.read(buf)) >= 0) {
            out.write(buf, 0, rd);
        }

        // over and out ...
        return true;
    } catch (IllegalAccessException iae) {
        // log or throw ???
    } catch (InvocationTargetException ite) {
        // log or throw ???
        // Throwable cause = ite.getTargetException();
    } finally {
        IOUtils.closeQuietly(ins);
    }

    return false;
}

From source file:org.clapper.curn.FeedDownloadThread.java

/**
 * Query the appropriate URL connection headers to determine whether
 * the remote server thinks feed data has changed since the last time
 * the feed was downloaded. Must be called on a <tt>URLConnection</tt>
 * after the <tt>InputStream</tt> is retrieved. Uses the feed cache to
 * set the value./*from   www  . jav  a2s. com*/
 *
 * @param conn     the <tt>URLConnection</tt> whose headers are to be
 *                 checked
 * @param feedInfo the information on the feed
 * @param cache    the cache
 *
 * @throws IOException I/O error
 */
private boolean feedHasChanged(final URLConnection conn, final FeedInfo feedInfo, final FeedCache cache)
        throws IOException {
    long lastSeen = 0;
    long lastModified = 0;
    boolean hasChanged = false;
    URL feedURL = feedInfo.getURL();

    if (cache != null) {
        FeedCacheEntry entry = cache.getEntryByURL(feedURL);

        if (entry != null)
            lastSeen = entry.getTimestamp();
    }

    if (lastSeen == 0) {
        log.debug("Feed \"" + feedURL.toString() + "\" has no recorded last-seen time.");
        hasChanged = true;
    }

    else if ((lastModified = conn.getLastModified()) == 0) {
        log.debug("Feed \"" + feedURL.toString() + "\" provides no last-modified time.");
        hasChanged = true;
    }

    else if (lastSeen >= lastModified) {
        log.debug("Feed \"" + feedURL.toString() + "\" has Last-Modified time of "
                + new Date(lastModified).toString() + ", which is not newer than last-seen time of "
                + new Date(lastSeen).toString() + ". Feed has no new data.");
    }

    else {
        log.debug("Feed \"" + feedURL.toString() + "\" has Last-Modified time of "
                + new Date(lastModified).toString() + ", which is newer than last-seen time of "
                + new Date(lastSeen).toString() + ". Feed might have new data.");
        hasChanged = true;
    }

    return hasChanged;
}

From source file:com.opoopress.maven.plugins.plugin.downloader.ProgressURLDownloader.java

private void downloadInternal(URL url, File destination) throws IOException {
    OutputStream out = null;/*  w ww .  j av a  2  s  .c o  m*/
    URLConnection conn;
    InputStream in = null;
    try {
        //URL url = address.toURL();
        conn = url.openConnection();

        //user agent
        final String userAgentValue = calculateUserAgent();
        conn.setRequestProperty("User-Agent", userAgentValue);

        //do not set gzip header if download zip file
        if (useGzip) {
            conn.setRequestProperty("Accept-Encoding", "gzip");
        }

        if (!useCache) {
            conn.setRequestProperty("Pragma", "no-cache");
        }

        in = conn.getInputStream();
        out = new BufferedOutputStream(new FileOutputStream(destination));

        copy(in, out);

        if (checkContentLength) {
            long contentLength = conn.getContentLengthLong();
            if (contentLength > 0 && contentLength != destination.length()) {
                throw new IllegalArgumentException("File length mismatch. expected: " + contentLength
                        + ", actual: " + destination.length());
            }
        }

        if (keepLastModified) {
            long lastModified = conn.getLastModified();
            if (lastModified > 0) {
                destination.setLastModified(lastModified);
            }
        }
    } finally {
        logMessage("");
        if (in != null) {
            in.close();
        }
        if (out != null) {
            out.close();
        }
    }
}

From source file:org.getobjects.appserver.publisher.GoResource.java

@Override
public void appendToResponse(final WOResponse _r, final WOContext _ctx) {
    URLConnection con = null;
    try {//from   w  ww.ja va 2 s  .com
        con = this.url.openConnection();
    } catch (IOException coe) {
        log.warn("could not open connection to url: " + this.url);
        _r.setStatus(WOMessage.HTTP_STATUS_NOT_FOUND);
        return;
    }

    /* open stream */

    InputStream is = null;
    try {
        is = con.getInputStream();
    } catch (IOException ioe) {
        log.warn("could not open stream to url: " + this.url);
        _r.setStatus(WOMessage.HTTP_STATUS_NOT_FOUND);
        return;
    }

    /* transfer */

    try {
        String mimeType = con.getContentType();
        if (mimeType == null || "content/unknown".equals(mimeType))
            mimeType = mimeTypeForPath(this.url.getPath());

        if (mimeType == null)
            mimeType = "application/octet-stream";

        _r.setHeaderForKey(mimeType, "content-type");
        _r.setHeaderForKey("" + con.getContentLength(), "content-length");

        /* setup caching headers */

        Date now = new Date();
        GregorianCalendar cal = new GregorianCalendar();

        cal.setTime(new Date(con.getLastModified()));
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "last-modified");

        cal.setTime(now);
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "date");

        cal.add(Calendar.SECOND, this.expirationIntervalForMimeType(mimeType));
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "expires");

        /* start streaming */

        _r.enableStreaming();

        byte[] buffer = new byte[0xFFFF];
        for (int len; (len = is.read(buffer)) != -1;)
            _r.appendContentData(buffer, len);
    } catch (IOException e) {
        log.error("IO error trying to deliver resource: " + this.url, e);
        _r.setStatus(WOMessage.HTTP_STATUS_INTERNAL_ERROR);
    } finally {
        try {
            if (is != null)
                is.close();
        } catch (IOException e) {
            log.warn("could not close URL input stream: " + this.url, e);
        }
    }
}

From source file:org.getobjects.appserver.publisher.JoResource.java

@Override
public void appendToResponse(WOResponse _r, WOContext _ctx) {
    URLConnection con = null;
    try {/*from w w  w. j av  a 2  s.c  o  m*/
        con = this.url.openConnection();
    } catch (IOException coe) {
        log.warn("could not open connection to url: " + this.url);
        _r.setStatus(WOMessage.HTTP_STATUS_NOT_FOUND);
        return;
    }

    /* open stream */

    InputStream is = null;
    try {
        is = con.getInputStream();
    } catch (IOException ioe) {
        log.warn("could not open stream to url: " + this.url);
        _r.setStatus(WOMessage.HTTP_STATUS_NOT_FOUND);
        return;
    }

    /* transfer */

    try {
        String mimeType = con.getContentType();
        if (mimeType == null || "content/unknown".equals(mimeType))
            mimeType = mimeTypeForPath(this.url.getPath());

        if (mimeType == null)
            mimeType = "application/octet-stream";

        _r.setHeaderForKey(mimeType, "content-type");
        _r.setHeaderForKey("" + con.getContentLength(), "content-length");

        /* setup caching headers */

        Date now = new Date();
        GregorianCalendar cal = new GregorianCalendar();

        cal.setTime(new Date(con.getLastModified()));
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "last-modified");

        cal.setTime(now);
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "date");

        cal.add(Calendar.SECOND, this.expirationIntervalForMimeType(mimeType));
        _r.setHeaderForKey(WOMessage.httpFormatDate(cal), "expires");

        /* start streaming */

        _r.enableStreaming();

        byte[] buffer = new byte[0xFFFF];
        for (int len; (len = is.read(buffer)) != -1;)
            _r.appendContentData(buffer, len);
    } catch (IOException e) {
        log.error("IO error trying to deliver resource: " + this.url, e);
        _r.setStatus(WOMessage.HTTP_STATUS_INTERNAL_ERROR);
    } finally {
        try {
            if (is != null)
                is.close();
        } catch (IOException e) {
            log.warn("could not close URL input stream: " + this.url, e);
        }
    }
}

From source file:org.apache.myfaces.config.FacesConfigurator.java

private long getResourceLastModified(URLConnection connection) throws IOException {
    long modified;
    if (connection instanceof JarURLConnection) {
        // The following hack is required to work-around a JDK bug.
        // getLastModified() on a JAR entry URL delegates to the actual JAR file
        // rather than the JAR entry.
        // This opens internally, and does not close, an input stream to the JAR
        // file./* ww  w  . j ava  2 s.c o  m*/
        // In turn, you cannot close it by yourself, because it's internal.
        // The work-around is to get the modification date of the JAR file
        // manually,
        // and then close that connection again.

        URL jarFileUrl = ((JarURLConnection) connection).getJarFileURL();
        URLConnection jarFileConnection = jarFileUrl.openConnection();

        try {
            modified = jarFileConnection.getLastModified();
        } finally {
            try {
                jarFileConnection.getInputStream().close();
            } catch (Exception exception) {
                // Ignored
            }
        }
    } else {
        modified = connection.getLastModified();
    }

    return modified;
}