Example usage for java.net HttpURLConnection setUseCaches

Introduction

In this page you can find the example usage for java.net HttpURLConnection setUseCaches.

Prototype

public void setUseCaches(boolean usecaches) 

Source Link

Document

Sets the value of the useCaches field of this URLConnection to the specified value.

Usage

From source file:com.laurencedawson.image_management.ImageManager.java

/**
 * Grab and save an image directly to disk
 * @param file The Bitmap file/*from  w ww .  j  av  a2 s. c o  m*/
 * @param url The URL of the image
 * @param imageCallback The callback associated with the request
 */
public static void cacheImage(final File file, ImageRequest imageCallback) {

    HttpURLConnection urlConnection = null;
    FileOutputStream fileOutputStream = null;
    InputStream inputStream = null;
    boolean isGif = false;

    try {
        // Setup the connection
        urlConnection = (HttpURLConnection) new URL(imageCallback.mUrl).openConnection();
        urlConnection.setConnectTimeout(ImageManager.LONG_CONNECTION_TIMEOUT);
        urlConnection.setReadTimeout(ImageManager.LONG_REQUEST_TIMEOUT);
        urlConnection.setUseCaches(true);
        urlConnection.setInstanceFollowRedirects(true);

        // Set the progress to 0
        imageCallback.sendProgressUpdate(imageCallback.mUrl, 0);

        // Connect
        inputStream = urlConnection.getInputStream();

        // Do not proceed if the file wasn't downloaded
        if (urlConnection.getResponseCode() == 404) {
            urlConnection.disconnect();
            return;
        }

        // Check if the image is a GIF
        String contentType = urlConnection.getHeaderField("Content-Type");
        if (contentType != null) {
            isGif = contentType.equals(GIF_MIME);
        }

        // Grab the length of the image
        int length = 0;
        try {
            String fileLength = urlConnection.getHeaderField("Content-Length");
            if (fileLength != null) {
                length = Integer.parseInt(fileLength);
            }
        } catch (NumberFormatException e) {
            if (ImageManager.DEBUG) {
                e.printStackTrace();
            }
        }

        // Write the input stream to disk
        fileOutputStream = new FileOutputStream(file, true);
        int byteRead = 0;
        int totalRead = 0;
        final byte[] buffer = new byte[8192];
        int frameCount = 0;

        // Download the image
        while ((byteRead = inputStream.read(buffer)) != -1) {

            // If the image is a gif, count the start of frames
            if (isGif) {
                for (int i = 0; i < byteRead - 3; i++) {
                    if (buffer[i] == 33 && buffer[i + 1] == -7 && buffer[i + 2] == 4) {
                        frameCount++;

                        // Once we have at least one frame, stop the download
                        if (frameCount > 1) {
                            fileOutputStream.write(buffer, 0, i);
                            fileOutputStream.close();

                            imageCallback.sendProgressUpdate(imageCallback.mUrl, 100);
                            imageCallback.sendCachedCallback(imageCallback.mUrl, true);

                            urlConnection.disconnect();
                            return;
                        }
                    }
                }
            }

            // Write the buffer to the file and update the total number of bytes
            // read so far (used for the callback)
            fileOutputStream.write(buffer, 0, byteRead);
            totalRead += byteRead;

            // Update the callback with the current progress
            if (length > 0) {
                imageCallback.sendProgressUpdate(imageCallback.mUrl,
                        (int) (((float) totalRead / (float) length) * 100));
            }
        }

        // Tidy up after the download
        if (fileOutputStream != null) {
            fileOutputStream.close();
        }

        // Sent the callback that the image has been downloaded
        imageCallback.sendCachedCallback(imageCallback.mUrl, true);

        if (inputStream != null) {
            inputStream.close();
        }

        // Disconnect the connection
        urlConnection.disconnect();
    } catch (final MalformedURLException e) {
        if (ImageManager.DEBUG) {
            e.printStackTrace();
        }

        // If the file exists and an error occurred, delete the file
        if (file != null) {
            file.delete();
        }

    } catch (final IOException e) {
        if (ImageManager.DEBUG) {
            e.printStackTrace();
        }

        // If the file exists and an error occurred, delete the file
        if (file != null) {
            file.delete();
        }

    }

}

---

From source file:com.scut.easyfe.network.kjFrame.http.HttpConnectStack.java

private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

    int timeoutMs = request.getTimeoutMs();
    connection.setConnectTimeout(timeoutMs);
    connection.setReadTimeout(timeoutMs);
    connection.setUseCaches(false);
    connection.setDoInput(true);//w ww.  ja v  a2 s.co m

    // use caller-provided custom SslSocketFactory, if any, for HTTPS
    if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
        ((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory);
    }

    return connection;
}

---

From source file:cn.garymb.wechatmoments.common.OkHttpStack.java

private HttpURLConnection openOkHttpURLConnection(OkUrlFactory factory, URL url, Request<?> request)
        throws IOException {
    HttpURLConnection connection = factory.open(url);
    int timeoutMs = request.getTimeoutMs();
    connection.setConnectTimeout(timeoutMs);
    connection.setReadTimeout(timeoutMs);
    connection.setUseCaches(false);
    connection.setDoInput(true);/* w  w w .j a v  a  2  s  .c om*/

    // use caller-provided custom SslSocketFactory, if any, for HTTPS
    if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
        ((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory);
    }

    return connection;
}

---

From source file:net.sbbi.upnp.messages.StateVariableMessage.java

/**
 * Executes the state variable query and retuns the UPNP device response, according to the UPNP specs,
 * this method could take up to 30 secs to process ( time allowed for a device to respond to a request )
 * @return a state variable response object containing the variable value
 * @throws IOException if some IOException occurs during message send and reception process
 * @throws UPNPResponseException if an UPNP error message is returned from the server
 *         or if some parsing exception occurs ( detailErrorCode = 899, detailErrorDescription = SAXException message )
 *///from  w ww  .  jav  a  2 s. co m
public StateVariableResponse service() throws IOException, UPNPResponseException {
    StateVariableResponse rtrVal = null;
    UPNPResponseException upnpEx = null;
    IOException ioEx = null;
    StringBuffer body = new StringBuffer(256);

    body.append("<?xml version=\"1.0\"?>\r\n");
    body.append("<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\"");
    body.append(" s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">");
    body.append("<s:Body>");
    body.append("<u:QueryStateVariable xmlns:u=\"urn:schemas-upnp-org:control-1-0\">");
    body.append("<u:varName>").append(serviceStateVar.getName()).append("</u:varName>");
    body.append("</u:QueryStateVariable>");
    body.append("</s:Body>");
    body.append("</s:Envelope>");

    if (log.isDebugEnabled())
        log.debug("POST prepared for URL " + service.getControlURL());
    URL url = new URL(service.getControlURL().toString());
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setDoInput(true);
    conn.setDoOutput(true);
    conn.setUseCaches(false);
    conn.setRequestMethod("POST");
    HttpURLConnection.setFollowRedirects(false);
    //conn.setConnectTimeout( 30000 );
    conn.setRequestProperty("HOST", url.getHost() + ":" + url.getPort());
    conn.setRequestProperty("SOAPACTION", "\"urn:schemas-upnp-org:control-1-0#QueryStateVariable\"");
    conn.setRequestProperty("CONTENT-TYPE", "text/xml; charset=\"utf-8\"");
    conn.setRequestProperty("CONTENT-LENGTH", Integer.toString(body.length()));
    OutputStream out = conn.getOutputStream();
    out.write(body.toString().getBytes());
    out.flush();
    conn.connect();
    InputStream input = null;

    if (log.isDebugEnabled())
        log.debug("executing query :\n" + body);
    try {
        input = conn.getInputStream();
    } catch (IOException ex) {
        // java can throw an exception if he error code is 500 or 404 or something else than 200
        // but the device sends 500 error message with content that is required
        // this content is accessible with the getErrorStream
        input = conn.getErrorStream();
    }

    if (input != null) {
        int response = conn.getResponseCode();
        String responseBody = getResponseBody(input);
        if (log.isDebugEnabled())
            log.debug("received response :\n" + responseBody);
        SAXParserFactory saxParFact = SAXParserFactory.newInstance();
        saxParFact.setValidating(false);
        saxParFact.setNamespaceAware(true);
        StateVariableResponseParser msgParser = new StateVariableResponseParser(serviceStateVar);
        StringReader stringReader = new StringReader(responseBody);
        InputSource src = new InputSource(stringReader);
        try {
            SAXParser parser = saxParFact.newSAXParser();
            parser.parse(src, msgParser);
        } catch (ParserConfigurationException confEx) {
            // should never happen
            // we throw a runtimeException to notify the env problem
            throw new RuntimeException(
                    "ParserConfigurationException during SAX parser creation, please check your env settings:"
                            + confEx.getMessage());
        } catch (SAXException saxEx) {
            // kind of tricky but better than nothing..
            upnpEx = new UPNPResponseException(899, saxEx.getMessage());
        } finally {
            try {
                input.close();
            } catch (IOException ex) {
                // ignoring
            }
        }
        if (upnpEx == null) {
            if (response == HttpURLConnection.HTTP_OK) {
                rtrVal = msgParser.getStateVariableResponse();
            } else if (response == HttpURLConnection.HTTP_INTERNAL_ERROR) {
                upnpEx = msgParser.getUPNPResponseException();
            } else {
                ioEx = new IOException("Unexpected server HTTP response:" + response);
            }
        }
    }
    try {
        out.close();
    } catch (IOException ex) {
        // ignore
    }
    conn.disconnect();
    if (upnpEx != null) {
        throw upnpEx;
    }
    if (rtrVal == null && ioEx == null) {
        ioEx = new IOException("Unable to receive a response from the UPNP device");
    }
    if (ioEx != null) {
        throw ioEx;
    }
    return rtrVal;
}

---

From source file:org.hawkular.apm.client.api.rest.AbstractRESTClient.java

public HttpURLConnection getConnectionForRequest(String tenantId, URL url, String method) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

    connection.setRequestMethod(method);
    connection.setDoOutput(true);//from w  w  w .  j av a 2s . com
    connection.setUseCaches(false);
    connection.setAllowUserInteraction(false);
    addHeaders(connection, tenantId);
    return connection;
}

---

From source file:com.sun.socialsite.web.rest.servlets.ProxyServlet.java

/**
 * Handles the HTTP <code>POST</code> method.
 * @param req servlet request//w ww .j av a  2 s  . c o  m
 * @param resp servlet response
 */
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    URL url = getURL(req, req.getParameter("uri"));
    HttpURLConnection con = (HttpURLConnection) (url.openConnection());
    con.setDoOutput(true);
    con.setAllowUserInteraction(false);
    con.setUseCaches(false);

    // TODO: figure out why this is necessary for HTTPS URLs
    if (con instanceof HttpsURLConnection) {
        HostnameVerifier hv = new HostnameVerifier() {
            public boolean verify(String urlHostName, SSLSession session) {
                if ("localhost".equals(urlHostName) && "127.0.0.1".equals(session.getPeerHost())) {
                    return true;
                } else {
                    log.error("URL Host: " + urlHostName + " vs. " + session.getPeerHost());
                    return false;
                }
            }
        };
        ((HttpsURLConnection) con).setDefaultHostnameVerifier(hv);
    }
    // pass along all appropriate HTTP headers
    Enumeration headerNames = req.getHeaderNames();
    while (headerNames.hasMoreElements()) {
        String hname = (String) headerNames.nextElement();
        if (!unproxiedHeaders.contains(hname.toLowerCase())) {
            con.addRequestProperty(hname, req.getHeader(hname));
        }
    }
    con.connect();

    // read POST data from incoming request, write to outgoing request
    BufferedInputStream in = new BufferedInputStream(req.getInputStream());
    BufferedOutputStream out = new BufferedOutputStream(con.getOutputStream());
    byte buffer[] = new byte[8192];
    for (int count = 0; count != -1;) {
        count = in.read(buffer, 0, 8192);
        if (count != -1)
            out.write(buffer, 0, count);
    }
    in.close();
    out.close();
    out.flush();

    // read result headers of POST, write to response
    Map<String, List<String>> headers = con.getHeaderFields();
    for (String key : headers.keySet()) {
        if (key != null) { // TODO: why is this check necessary!
            List<String> header = headers.get(key);
            if (header.size() > 0)
                resp.setHeader(key, header.get(0));
        }
    }

    // read result data of POST, write out to response
    in = new BufferedInputStream(con.getInputStream());
    out = new BufferedOutputStream(resp.getOutputStream());
    for (int count = 0; count != -1;) {
        count = in.read(buffer, 0, 8192);
        if (count != -1)
            out.write(buffer, 0, count);
    }
    in.close();
    out.close();
    out.flush();

    con.disconnect();
}

---

From source file:com.lark.http.LarkHurlStack.java

/**
* Opens an {@link HttpURLConnection} with parameters.
* @param url//  w  w w . j  ava  2 s.  c  o  m
* @return an open connection
* @throws IOException
*/
private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException {
    HttpURLConnection connection = createConnection(url);

    int timeoutMs = request.getTimeoutMs();
    connection.setConnectTimeout(timeoutMs);
    connection.setReadTimeout(timeoutMs);
    connection.setUseCaches(false);
    connection.setDoInput(true);

    // use caller-provided custom SslSocketFactory, if any, for HTTPS
    if ("https".equals(url.getProtocol())) {
        HttpsTrustManager.allowAllSSL();//TODO really support?
    }

    return connection;
}

---

From source file:com.lovebridge.library.volley.toolbox.HurlStack.java

/**
 * Opens an {@link HttpURLConnection} with parameters.
 *
 * @param url//  w  ww.j  av  a  2  s .  c  om
 * @return an open connection
 * @throws IOException
 */
private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException {
    HttpURLConnection connection = createConnection(url);
    int timeoutMs = request.getTimeoutMs();
    connection.setConnectTimeout(timeoutMs);
    connection.setReadTimeout(timeoutMs);
    connection.setUseCaches(false);
    connection.setDoInput(true);
    // use caller-provided custom SslSocketFactory, if any, for HTTPS
    if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
        ((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory);
    }
    return connection;
}

---

From source file:org.bibsonomy.scraper.url.kde.blackwell.BlackwellSynergyScraper.java

/** FIXME: refactor
 * Extract the content of a scitation.aip.org page.
 * (changed code from ScrapingContext.getContentAsString)
 * @param urlConn Connection to api page (from url.openConnection())
 * @param cookie Cookie for auth.//from  ww  w .j  a v a  2s .c o  m
 * @return Content of aip page.
 * @throws IOException
 */
private String getPageContent(HttpURLConnection urlConn, String cookie) throws IOException {

    urlConn.setAllowUserInteraction(true);
    urlConn.setDoInput(true);
    urlConn.setDoOutput(false);
    urlConn.setUseCaches(false);
    urlConn.setFollowRedirects(true);
    urlConn.setInstanceFollowRedirects(false);
    urlConn.setRequestProperty("Cookie", cookie);

    urlConn.setRequestProperty("User-Agent",
            "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)");
    urlConn.connect();

    // build content
    StringWriter out = new StringWriter();
    InputStream in = new BufferedInputStream(urlConn.getInputStream());
    int b;
    while ((b = in.read()) >= 0) {
        out.write(b);
    }

    urlConn.disconnect();
    in.close();
    out.flush();
    out.close();

    return out.toString();
}

---

From source file:com.android.volley.util.HurlStack.java

/**
 * Opens an {@link HttpURLConnection} with parameters.
 * @param url/*from ww  w.j  a v  a 2 s . c o m*/
 * @return an open connection
 * @throws IOException
 */
private HttpURLConnection openConnection(URL url, Request<?> request) throws IOException {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();

    int timeoutMs = request.getTimeoutMs();
    connection.setConnectTimeout(timeoutMs);
    connection.setReadTimeout(timeoutMs);
    connection.setUseCaches(false);
    connection.setDoInput(true);

    // use caller-provided custom SslSocketFactory, if any, for HTTPS
    if ("https".equals(url.getProtocol()) && mSslSocketFactory != null) {
        ((HttpsURLConnection) connection).setSSLSocketFactory(mSslSocketFactory);
    }

    return connection;
}

---

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