Example usage for java.net HttpURLConnection getHeaderField

List of usage examples for java.net HttpURLConnection getHeaderField

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Introduction

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

Prototype

public String getHeaderField(int n)

Source Link

Document

Returns the value for the n th header field.

Usage

From source file:vocab.VocabUtils.java

/**
 * Jena fails to load models in https with content negotiation. Therefore I do
 * the negotiation here directly/* ww w. ja  v a 2s . co  m*/
 */
private static void doContentNegotiation(OntModel model, Vocabulary v, String accept, String serialization) {
    try {
        model.read(v.getUri(), null, serialization);

    } catch (Exception e) {
        try {
            System.out.println("Failed to read the ontology. Doing content negotiation");
            URL url = new URL(v.getUri());
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("Accept", accept);

            int status = connection.getResponseCode();
            if (status == HttpURLConnection.HTTP_SEE_OTHER || status == HttpURLConnection.HTTP_MOVED_TEMP
                    || status == HttpURLConnection.HTTP_MOVED_PERM) {
                String newUrl = connection.getHeaderField("Location");
                //v.setUri(newUrl);
                connection = (HttpURLConnection) new URL(newUrl).openConnection();
                connection.setRequestProperty("Accept", accept);
                InputStream in = (InputStream) connection.getInputStream();
                model.read(in, null, serialization);
            }
        } catch (Exception e2) {
            System.out.println("Failed to read the ontology");
        }
    }
}

From source file:org.apache.hadoop.hdfs.web.WebHdfsFileSystem.java

/**
 * Two-step Create/Append:/* w  ww.  jav  a  2  s.  c o m*/
 * Step 1) Submit a Http request with neither auto-redirect nor data. 
 * Step 2) Submit another Http request with the URL from the Location header with data.
 * 
 * The reason of having two-step create/append is for preventing clients to
 * send out the data before the redirect. This issue is addressed by the
 * "Expect: 100-continue" header in HTTP/1.1; see RFC 2616, Section 8.2.3.
 * Unfortunately, there are software library bugs (e.g. Jetty 6 http server
 * and Java 6 http client), which do not correctly implement "Expect:
 * 100-continue". The two-step create/append is a temporary workaround for
 * the software library bugs.
 */
static HttpURLConnection twoStepWrite(HttpURLConnection conn, final HttpOpParam.Op op) throws IOException {
    //Step 1) Submit a Http request with neither auto-redirect nor data. 
    conn.setInstanceFollowRedirects(false);
    conn.setDoOutput(false);
    conn.connect();
    validateResponse(HttpOpParam.TemporaryRedirectOp.valueOf(op), conn);
    final String redirect = conn.getHeaderField("Location");
    conn.disconnect();

    //Step 2) Submit another Http request with the URL from the Location header with data.
    conn = (HttpURLConnection) new URL(redirect).openConnection();
    conn.setRequestMethod(op.getType().toString());
    return conn;
}

From source file:com.francetelecom.clara.cloud.paas.it.services.helper.PaasServicesEnvApplicationAccessHelper.java

/**
 * Check if a string appear in the html page
 *
 * @param url//from   w  w  w  . j  a v a2 s  . c om
 *            URL to test
 * @param token
 *            String that must be in html page
 * @return Cookie that identifies the was or null if the test failed. An
 *         empty string means that no cookie was found in the request, but
 *         the check succeeded.
 */
private static String checkStringAndReturnCookie(URL url, String token, String httpProxyHost,
        int httpProxyPort) {
    InputStream is = null;
    String cookie = null;
    try {
        HttpURLConnection connection;
        if (httpProxyHost != null) {
            Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(httpProxyHost, httpProxyPort));
            connection = (HttpURLConnection) url.openConnection(proxy);
        } else {
            connection = (HttpURLConnection) url.openConnection();
        }
        connection.setRequestMethod("GET");

        is = connection.getInputStream();
        // check http status code
        if (connection.getResponseCode() == 200) {
            DataInputStream dis = new DataInputStream(new BufferedInputStream(is));
            StringWriter writer = new StringWriter();
            IOUtils.copy(dis, writer, "UTF-8");
            if (writer.toString().contains(token)) {
                cookie = connection.getHeaderField("Set-Cookie");
                if (cookie == null)
                    cookie = "";
            } else {
                logger.info("URL " + url.getFile() + " returned code 200 but does not contain keyword '" + token
                        + "'");
                logger.debug("1000 first chars of response body: " + writer.toString().substring(0, 1000));
            }
        } else {
            logger.error("URL " + url.getFile() + " returned code " + connection.getResponseCode() + " : "
                    + connection.getResponseMessage());
            if (System.getProperty("http.proxyHost") != null) {
                logger.info("Using proxy=" + System.getProperty("http.proxyHost") + ":"
                        + System.getProperty("http.proxyPort"));
            }
        }
    } catch (IOException e) {
        logger.error("URL test failed: " + url.getFile() + " => " + e.getMessage() + " ("
                + e.getClass().getName() + ")");
        if (System.getProperty("http.proxyHost") != null) {
            logger.info("Using proxy=" + System.getProperty("http.proxyHost") + ":"
                    + System.getProperty("http.proxyPort"));
        }
    } finally {
        try {
            if (is != null) {
                is.close();
            }
        } catch (IOException ioe) {
            // just going to ignore this one
        }
    }
    return cookie;

}

From source file:nl.ordina.bag.etl.mail.handler.HttpClient.java

private String getFilename(HttpURLConnection connection) {
    String s = connection.getHeaderField("Content-Disposition");
    Matcher matcher = filePattern.matcher(s);
    return matcher.find() ? matcher.group(1) : UUID.randomUUID().toString();
}

From source file:com.gson.util.HttpKit.java

/**
 * ?/*from w w  w  .  ja  v a2 s.  c  o m*/
 * @param url
 * @return
 * @throws IOException
 */
public static Attachment download(String url) throws IOException {
    Attachment att = new Attachment();
    HttpURLConnection conn = initHttp(url, _GET, null);
    if (conn.getContentType().equalsIgnoreCase("text/plain")) {
        // BufferedReader???URL?  
        InputStream in = conn.getInputStream();
        BufferedReader read = new BufferedReader(new InputStreamReader(in, DEFAULT_CHARSET));
        String valueString = null;
        StringBuffer bufferRes = new StringBuffer();
        while ((valueString = read.readLine()) != null) {
            bufferRes.append(valueString);
        }
        in.close();
        att.setError(bufferRes.toString());
    } else {
        BufferedInputStream bis = new BufferedInputStream(conn.getInputStream());
        String ds = conn.getHeaderField("Content-disposition");
        String fullName = ds.substring(ds.indexOf("filename=\"") + 10, ds.length() - 1);
        String relName = fullName.substring(0, fullName.lastIndexOf("."));
        String suffix = fullName.substring(relName.length() + 1);

        att.setFullName(fullName);
        att.setFileName(relName);
        att.setSuffix(suffix);
        att.setContentLength(conn.getHeaderField("Content-Length"));
        att.setContentType(conn.getHeaderField("Content-Type"));

        att.setFileStream(bis);
    }
    return att;
}

From source file:com.github.codingtogenomic.CodingToGenomic.java

private static String getContent(final String endpoint)
        throws MalformedURLException, IOException, InterruptedException {

    if (requestCount == 15) { // check every 15
        final long currentTime = System.currentTimeMillis();
        final long diff = currentTime - lastRequestTime;
        //if less than a second then sleep for the remainder of the second
        if (diff < 1000) {
            Thread.sleep(1000 - diff);
        }//from  w w  w. j  a  v a  2  s .com
        //reset
        lastRequestTime = System.currentTimeMillis();
        requestCount = 0;
    }

    final URL url = new URL(SERVER + endpoint);
    URLConnection connection = url.openConnection();
    HttpURLConnection httpConnection = (HttpURLConnection) connection;
    httpConnection.setRequestProperty("Content-Type", "application/json");

    final InputStream response = httpConnection.getInputStream();
    int responseCode = httpConnection.getResponseCode();

    if (responseCode != 200) {
        if (responseCode == 429 && httpConnection.getHeaderField("Retry-After") != null) {
            double sleepFloatingPoint = Double.valueOf(httpConnection.getHeaderField("Retry-After"));
            double sleepMillis = 1000 * sleepFloatingPoint;
            Thread.sleep((long) sleepMillis);
            return getContent(endpoint);
        }
        throw new RuntimeException("Response code was not 200. Detected response was " + responseCode);
    }

    String output;
    Reader reader = null;
    try {
        reader = new BufferedReader(new InputStreamReader(response, "UTF-8"));
        StringBuilder builder = new StringBuilder();
        char[] buffer = new char[8192];
        int read;
        while ((read = reader.read(buffer, 0, buffer.length)) > 0) {
            builder.append(buffer, 0, read);
        }
        output = builder.toString();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException logOrIgnore) {
                logOrIgnore.printStackTrace();
            }
        }
    }

    return output;
}

From source file:och.util.NetUtil.java

public static String invokePost(HttpURLConnection conn, String postBody) throws IOException {

    try {/*from  www  .j  a  v a 2  s .  c om*/

        if (Util.isEmpty(postBody)) {

            conn.setDoOutput(false);

        } else {

            // Send post request
            conn.setDoOutput(true);

            DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
            wr.writeBytes(postBody);
            wr.flush();
            wr.close();
        }

        int code = conn.getResponseCode();
        //It may happen due to keep-alive problem http://stackoverflow.com/questions/1440957/httpurlconnection-getresponsecode-returns-1-on-second-invocation
        if (code == -1) {
            throw new IllegalStateException("NetUtil: conn.getResponseCode() return -1");
        }

        InputStream is = new BufferedInputStream(conn.getInputStream());
        String enc = conn.getHeaderField("Content-Encoding");
        if (enc != null && enc.equalsIgnoreCase("gzip")) {
            is = new GZIPInputStream(is);
        }
        String response = StreamUtil.streamToStr(is);
        return response;
    } finally {
        if (conn != null) {
            conn.disconnect();
        }
    }
}

From source file:gmusic.api.comm.HttpUrlConnector.java

private void setCookie(HttpURLConnection connection) {
    if (!Strings.isNullOrEmpty(connection.getHeaderField("Set-Cookie")) && cookie == null) {
        rawCookie = connection.getHeaderField("Set-Cookie");
        int startIndex = rawCookie.indexOf("xt=") + "xt=".length();
        int endIndex = rawCookie.indexOf(";", startIndex);
        cookie = rawCookie.substring(startIndex, endIndex);
    }/*from   w  ww  .  j a v a  2 s  .c o m*/
}

From source file:com.dream.library.utils.AbFileUtil.java

/**
 * ???xx.??.//from  w  w  w . ja va2  s .co  m
 *
 * @param connection 
 * @return ??
 */
public static String getRealFileName(HttpURLConnection connection) {
    String name = null;
    try {
        if (connection == null) {
            return name;
        }
        if (connection.getResponseCode() == 200) {
            for (int i = 0;; i++) {
                String mime = connection.getHeaderField(i);
                if (mime == null) {
                    break;
                }
                // "Content-Disposition","attachment; filename=1.txt"
                // Content-Length
                if ("content-disposition".equals(connection.getHeaderFieldKey(i).toLowerCase())) {
                    Matcher m = Pattern.compile(".*filename=(.*)").matcher(mime.toLowerCase());
                    if (m.find()) {
                        return m.group(1).replace("\"", "");
                    }
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        AbLog.e("???");
    }
    return name;
}

From source file:com.mobile.natal.natalchart.NetworkUtilities.java

/**
 * Sends an HTTP GET request to a url//from w  ww . j a  va  2s.  c  o m
 *
 * @param urlStr            - The URL of the server. (Example: " http://www.yahoo.com/search")
 * @param file              the output file. If it is a folder, it tries to get the file name from the header.
 * @param requestParameters - all the request parameters (Example: "param1=val1&param2=val2").
 *                          Note: This method will add the question mark (?) to the request -
 *                          DO NOT add it yourself
 * @param user              user.
 * @param password          password.
 * @return the file written.
 * @throws Exception if something goes wrong.
 */
public static File sendGetRequest4File(String urlStr, File file, String requestParameters, String user,
        String password) throws Exception {
    if (requestParameters != null && requestParameters.length() > 0) {
        urlStr += "?" + requestParameters;
    }
    HttpURLConnection conn = makeNewConnection(urlStr);
    conn.setRequestMethod("GET");
    // conn.setDoOutput(true);
    conn.setDoInput(true);
    // conn.setChunkedStreamingMode(0);
    conn.setUseCaches(false);

    if (user != null && password != null && user.trim().length() > 0 && password.trim().length() > 0) {
        conn.setRequestProperty("Authorization", getB64Auth(user, password));
    }
    conn.connect();

    if (file.isDirectory()) {
        // try to get the header
        String headerField = conn.getHeaderField("Content-Disposition");
        String fileName = null;
        if (headerField != null) {
            String[] split = headerField.split(";");
            for (String string : split) {
                String pattern = "filename=";
                if (string.toLowerCase().startsWith(pattern)) {
                    fileName = string.replaceFirst(pattern, "");
                    break;
                }
            }
        }
        if (fileName == null) {
            // give a name
            fileName = "FILE_" + TimeUtilities.INSTANCE.TIMESTAMPFORMATTER_LOCAL.format(new Date());
        }
        file = new File(file, fileName);
    }

    InputStream in = null;
    FileOutputStream out = null;
    try {
        in = conn.getInputStream();
        out = new FileOutputStream(file);

        byte[] buffer = new byte[(int) maxBufferSize];
        int bytesRead = in.read(buffer, 0, (int) maxBufferSize);
        while (bytesRead > 0) {
            out.write(buffer, 0, bytesRead);
            bytesRead = in.read(buffer, 0, (int) maxBufferSize);
        }
        out.flush();
    } finally {
        if (in != null)
            in.close();
        if (out != null)
            out.close();
        if (conn != null)
            conn.disconnect();
    }
    return file;
}