Example usage for java.net URL openStream

Introduction

In this page you can find the example usage for java.net URL openStream.

Prototype

public final InputStream openStream() throws java.io.IOException

Source Link

Document

Opens a connection to this URL and returns an InputStream for reading from that connection.

Usage

From source file:com.xerox.amazonws.ec2.EC2Utils.java

/**
 * This method makes a best effort to fetch all instance metadata.
 *
 * @return map of metadata//w  w w . j  av  a  2  s  .co m
 */
public static Map<String, String> getInstanceMetadata() {
    HashMap<String, String> result = new HashMap<String, String>();
    int retries = 0;
    while (true) {
        try {
            URL url = new URL("http://169.254.169.254/latest/meta-data/");
            BufferedReader rdr = new BufferedReader(new InputStreamReader(url.openStream()));
            String line = rdr.readLine();
            while (line != null) {
                try {
                    String val = getInstanceMetadata(line);
                    result.put(line, val);
                } catch (IOException ex) {
                    logger.error("Problem fetching piece of instance metadata!", ex);
                }
                line = rdr.readLine();
            }
            return result;
        } catch (IOException ex) {
            if (retries == 5) {
                logger.debug("Problem getting instance data, retries exhausted...");
                return result;
            } else {
                logger.debug("Problem getting instance data, retrying...");
                try {
                    Thread.sleep((int) Math.pow(2.0, retries) * 1000);
                } catch (InterruptedException e) {
                }
            }
        }
    }
}

From source file:com.accumulobook.designs.rdf.FreebaseExample.java

public static List<Pair<String, String>> getProperties(final String subject) throws Exception {

    ArrayList<Pair<String, String>> properties = new ArrayList<>();

    URL url = new URL("https://www.googleapis.com/freebase/v1/topic/en/" + subject);

    StringWriter writer = new StringWriter();
    IOUtils.copy(url.openStream(), writer);

    String string = writer.toString();

    JSONObject obj = new JSONObject(string);

    JSONObject propArray = obj.getJSONObject("property");

    Iterator iter = propArray.keys();
    while (iter.hasNext()) {
        String propertyName = (String) iter.next();
        JSONObject property = propArray.getJSONObject(propertyName);

        JSONArray values = property.getJSONArray("values");
        for (int i = 0; i < values.length(); i++) {
            properties.add(new Pair(propertyName, values.getJSONObject(i).getString("text")));
        }/*from w  w  w .j  ava2s  . c  om*/
    }

    return properties;
}

From source file:net.myrrix.common.io.IOUtils.java

/**
 * @param url  URL whose contents are to be read and copied
 * @param file file to write contents to
 * @throws IOException if the URL can't be read or the file can't be written
 *//*from  w  w  w . j a  v a2s  .  c  om*/
public static void copyURLToFile(URL url, File file) throws IOException {
    InputStream in = url.openStream();
    try {
        copyStreamToFile(in, file);
    } finally {
        in.close();
    }
}

From source file:net.nifheim.beelzebu.coins.common.utils.dependencies.DependencyManager.java

private static File downloadDependency(File libDir, Dependency dependency) throws Exception {
    String fileName = dependency.name().toLowerCase() + "-" + dependency.getVersion() + ".jar";

    File file = new File(libDir, fileName);
    if (file.exists()) {
        return file;
    }/*www. j  a v a  2s.  c  o m*/

    URL url = new URL(dependency.getUrl());

    core.getMethods().log("Dependency '" + fileName + "' could not be found. Attempting to download.");
    try (InputStream in = url.openStream()) {
        Files.copy(in, file.toPath());
    }

    if (!file.exists()) {
        throw new IllegalStateException("File not present. - " + file.toString());
    } else {
        core.getMethods().log("Dependency '" + fileName + "' successfully downloaded.");
        return file;
    }
}

From source file:com.easarrive.aws.plugins.common.util.SNSUtil.java

public static StringBuilder getHttpRequestContent(URL url) {
    if (url == null) {
        return null;
    }/*from w w  w .ja va  2 s .c  om*/
    StringBuilder builder = null;
    try {
        builder = getHttpRequestContent(url.openStream());
    } catch (IOException e2) {
        e2.printStackTrace();
    }
    return builder;
}

From source file:info.usbo.skypetwitter.Run.java

private static void vk() throws ParseException {
    String url = "https://api.vk.com/method/wall.get?v=5.28&domain=Depersonilized&filter=owner&extended=1";
    String line = "";
    try {/*from  ww  w  . j av a  2s . com*/
        URL url2 = new URL(url);
        BufferedReader reader = new BufferedReader(new InputStreamReader(url2.openStream(), "UTF-8"));
        line = reader.readLine();
        reader.close();

    } catch (MalformedURLException e) {
        // ...
    } catch (IOException e) {
        // ...
    }
    JSONObject json = (JSONObject) new JSONParser().parse(line);
    json = (JSONObject) new JSONParser().parse(json.get("response").toString());
    JSONArray jsona = (JSONArray) new JSONParser().parse(json.get("items").toString());
    vk.clear();
    for (int i = 0; i < jsona.size(); i++) {
        vk.add(new VK(jsona.get(i).toString()));
    }
}

From source file:net.sf.jasperreports.engine.util.JRXmlUtils.java

/**
 * Parses an URL stream as a XML document.
 * /* ww w .  ja va 2  s.  c o m*/
 * @param url the URL
 * @return the document
 * @throws JRException
 */
public static Document parse(URL url, boolean isNamespaceAware) throws JRException {
    InputStream is = null;
    try {
        is = url.openStream();
        return createDocumentBuilder(isNamespaceAware).parse(is);
    } catch (SAXException e) {
        throw new JRException(EXCEPTION_MESSAGE_KEY_DOCUMENT_PARSING_FAILURE, null, e);
    } catch (IOException e) {
        throw new JRException(EXCEPTION_MESSAGE_KEY_DOCUMENT_PARSING_FAILURE, null, e);
    } finally {
        if (is != null) {
            try {
                is.close();
            } catch (IOException e) {
                log.warn("Error closing stream of URL " + url, e);
            }
        }
    }
}

From source file:net.myrrix.common.io.IOUtils.java

/**
 * @param url URL whose contents are to be read
 * @return the contents of the URL, interpreted as a UTF-8 encoded string
 * @throws IOException if the URL can't be read or the file can't be written
 *//*from   ww  w .  j  av  a 2  s .co  m*/
public static String readSmallTextFromURL(URL url) throws IOException {
    Reader in = new InputStreamReader(url.openStream(), Charsets.UTF_8);
    try {
        return CharStreams.toString(in);
    } finally {
        in.close();
    }
}

From source file:de.mfo.jsurf.grid.RotationGrid.java

public static void loadFromFile(URL url) throws IOException, Exception {
    Properties props = new Properties();
    props.load(url.openStream());
    loadFromProperties(props);//from w w w. j ava2  s  . co m
}

From source file:io.apiman.gateway.engine.jdbc.JdbcMetricsTest.java

/**
 * Initialize the DB with the apiman gateway DDL.
 * @param connection/*from   w w  w. j  a  v  a 2s.  c o  m*/
 */
private static void initDB(Connection connection) throws Exception {
    ClassLoader cl = JdbcMetricsTest.class.getClassLoader();
    URL resource = cl.getResource("ddls/apiman-gateway_h2.ddl");
    try (InputStream is = resource.openStream()) {
        System.out.println("=======================================");
        System.out.println("Initializing database.");
        DdlParser ddlParser = new DdlParser();
        List<String> statements = ddlParser.parse(is);
        for (String sql : statements) {
            System.out.println(sql);
            PreparedStatement statement = connection.prepareStatement(sql);
            statement.execute();
        }
        System.out.println("=======================================");
    }
}