Example usage for java.net URL openConnection

Introduction

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

Prototype

public URLConnection openConnection() throws java.io.IOException 

Source Link

Document

Returns a java.net.URLConnection URLConnection instance that represents a connection to the remote object referred to by the URL .

Usage

From source file:org.cytoscape.app.internal.net.server.AddAccessControlAllowOriginHeaderAfterResponseTest.java

private static HttpURLConnection connectToURL(String urlString, String method) throws Exception {
    final URL url = new URL(urlString);
    final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod(method);
    connection.setDoOutput(true);/* w  ww .j av  a 2 s .co  m*/
    connection.setConnectTimeout(1000);
    connection.connect();
    return connection;
}

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From source file:com.abid_mujtaba.bitcoin.tracker.network.Client.java

private static String get(String url_string) throws ClientException {
    HttpURLConnection connection = null; // NOTE: fetchImage is set up to use HTTP not HTTPS

    try {//from   w  w  w . jav  a 2 s  .  com
        URL url = new URL(url_string);
        connection = (HttpURLConnection) url.openConnection();

        connection.setConnectTimeout(CONNECTION_TIMEOUT);
        connection.setReadTimeout(READ_TIMEOUT);

        InputStream is = new BufferedInputStream(connection.getInputStream());

        int response_code;

        if ((response_code = connection.getResponseCode()) != 200) {
            throw new ClientException("Error code returned by response: " + response_code);
        }

        return InputStreamToString(is);
    } catch (SocketTimeoutException e) {
        throw new ClientException("Socket timed out.", e);
    } catch (IOException e) {
        throw new ClientException("IO Exception raised while attempting to GET response.", e);
    } finally {
        if (connection != null) {
            connection.disconnect();
        }
    }
}

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From source file:com.krawler.esp.utils.HttpPost.java

public static String GetResponse(String postdata) {
    try {/*from  ww w . j a  v a 2  s.  co  m*/
        String s = URLEncoder.encode(postdata, "UTF-8");
        // URL u = new URL("http://google.com");
        URL u = new URL("http://localhost:7070/service/soap/");
        URLConnection uc = u.openConnection();
        uc.setDoOutput(true);
        uc.setDoInput(true);
        uc.setAllowUserInteraction(false);

        DataOutputStream dstream = new DataOutputStream(uc.getOutputStream());

        // The POST line
        dstream.writeBytes(s);
        dstream.close();

        // Read Response
        InputStream in = uc.getInputStream();
        int x;
        while ((x = in.read()) != -1) {
            System.out.write(x);
        }
        in.close();

        BufferedReader r = new BufferedReader(new InputStreamReader(in));
        StringBuffer buf = new StringBuffer();
        String line;
        while ((line = r.readLine()) != null) {
            buf.append(line);
        }
        return buf.toString();
    } catch (Exception e) {
        // throw e;
        return e.toString();
    }
}

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From source file:Main.java

/**
 *  This method is used to send a XML request file to web server to process the request and return
 *  xml response containing event id./*  www .  jav a2 s . c o m*/
 */
public static String postXMLWithTimeout(String postUrl, String xml, int readTimeout) throws Exception {

    System.out.println("XMLUtils.postXMLWithTimeout: Connecting to Web Server .......");

    InputStream in = null;
    BufferedReader bufferedReader = null;
    OutputStream out = null;
    PrintWriter printWriter = null;
    StringBuffer responseMessageBuffer = new StringBuffer("");

    try {
        URL url = new URL(postUrl);
        URLConnection con = url.openConnection();

        // Prepare for both input and output
        con.setDoInput(true);
        con.setDoOutput(true);

        // Turn off caching
        con.setUseCaches(false);
        con.setRequestProperty("Content-Type", "text/xml");
        con.setReadTimeout(readTimeout);
        out = con.getOutputStream();
        // Write the arguments as post data
        printWriter = new PrintWriter(out);

        printWriter.println(xml);
        printWriter.flush();

        //Process response and return back to caller function
        in = con.getInputStream();
        bufferedReader = new BufferedReader(new InputStreamReader(in));
        String tempStr = null;

        int tempClearResponseMessageBufferCounter = 0;
        while ((tempStr = bufferedReader.readLine()) != null) {
            tempClearResponseMessageBufferCounter++;
            //clear the buffer for the first time
            if (tempClearResponseMessageBufferCounter == 1)
                responseMessageBuffer.setLength(0);
            responseMessageBuffer.append(tempStr);
        }

    } catch (Exception ex) {
        throw ex;
    } finally {
        System.out.println("Calling finally in POSTXML");
        try {
            if (in != null)
                in.close();
        } catch (Exception eex) {
            System.out.println("COULD NOT Close Input Stream in try");
        }
        try {
            if (out != null)
                out.close();
        } catch (Exception eex) {
            System.out.println("COULD NOT Close Output Stream in try");
        }

    }
    System.out.println("XMLUtils.postXMLWithTimeout: end .......");
    return responseMessageBuffer.toString();
}

---

From source file:net.meltdowntech.steamstats.SteamGame.java

public static SteamGame fetchGame(int id) {
    //Create query url
    String url = Steam.URL + Steam.GAME_DATA + "?key=" + Steam.KEY + "&appid=" + id;
    try {/*from   w w w.  jav  a 2 s.  c om*/
        //Attempt connection and parse
        URL steam = new URL(url);
        URLConnection steamConn = steam.openConnection();
        Reader steamReader = new InputStreamReader(steamConn.getInputStream());
        JSONTokener steamTokener = new JSONTokener(steamReader);
        JSONObject data = (JSONObject) steamTokener.nextValue();
        JSONObject response = data.getJSONObject("game");
        SteamGame game = new SteamGame();

        //Parse each field
        Iterator keys = response.keys();
        while (keys.hasNext()) {
            String key = (String) keys.next();
            game.values.put(key, response.get(key));
        }
        return game;
    } catch (MalformedURLException ex) {
        Util.printError("Invalid URL");
    } catch (IOException | JSONException ex) {
        Util.printError("Invalid data");
    } catch (Exception ex) {
        Util.printError("Generic error");
    }
    return new SteamGame();
}

---

From source file:Main.java

public static String customrequestget(String url, HashMap<String, String> map, String method) {

    if (null != map) {
        int i = 0;
        for (Map.Entry<String, String> entry : map.entrySet()) {

            if (i == 0) {
                url = url + "?" + entry.getKey() + "=" + entry.getValue();
            } else {
                url = url + "&" + entry.getKey() + "=" + entry.getValue();
            }/*www  . j a v  a  2 s .  com*/

            i++;
        }
    }
    try {

        URL murl = new URL(url);
        System.out.print(url);
        HttpURLConnection conn = (HttpURLConnection) murl.openConnection();
        conn.setConnectTimeout(5 * 1000);
        conn.setRequestMethod(method);

        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows XP; DigExt)");

        InputStream inStream = conn.getInputStream();
        String result = inputStream2String(inStream);
        conn.disconnect();
        return result;
    } catch (Exception e) {
        // TODO: handle exception
    }
    return null;
}

---

From source file:Main.java

public static String upLoad(File file, String RequestURL) {
    String BOUNDER = UUID.randomUUID().toString();
    String PREFIX = "--";
    String END = "/r/n";

    try {/* ww  w .  ja  v a  2 s .c o  m*/
        URL url = new URL(RequestURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(TIME_OUT);
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.setUseCaches(false);
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Charset", CHARSET);
        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Cotent-Type", CONTENT_TYPE + ";boundary=" + BOUNDER);

        if (file != null) {
            OutputStream outputStream = connection.getOutputStream();

            DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
            StringBuffer sb = new StringBuffer();
            sb.append(PREFIX);
            sb.append(BOUNDER + END);
            dataOutputStream.write(sb.toString().getBytes());
            InputStream in = new FileInputStream(file);
            byte[] b = new byte[1024];
            int l = 0;
            while ((l = in.read()) != -1) {
                outputStream.write(b, 0, l);
            }
            in.close();
            dataOutputStream.write(END.getBytes());
            dataOutputStream.write((PREFIX + BOUNDER + PREFIX + END).getBytes());
            dataOutputStream.flush();

            int i = connection.getResponseCode();
            if (i == 200) {
                return SUCCESS;
            }
        }

    } catch (IOException e) {
        e.printStackTrace();
    }
    return FALIURE;

}

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From source file:net.ftb.data.news.RSSReader.java

public static List<NewsArticle> readRSS() {
    try {//from w w w.  j  av  a  2  s  . co  m
        List<NewsArticle> news = Lists.newArrayList();

        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        URL u = new URL(Locations.feedURL);
        HttpURLConnection conn = (HttpURLConnection) u.openConnection();
        conn.connect();
        if (conn.getResponseCode() != 200) {
            Logger.logWarn("News download failed");
            AppUtils.debugConnection(conn);
            conn.disconnect();
            return null;
        }
        Document doc = builder.parse(conn.getInputStream());
        NodeList nodes = doc.getElementsByTagName("item");

        for (int i = 0; i < nodes.getLength(); i++) {
            Element element = (Element) nodes.item(i);
            NewsArticle article = new NewsArticle();
            article.setTitle(getTextValue(element, "title"));
            article.setHyperlink(getTextValue(element, "link"));
            article.setBody(getTextValue(element, "content:encoded"));
            article.setDate(getTextValue(element, "pubDate"));
            news.add(article);
        }

        return news;
    } catch (Exception ex) {
        Logger.logWarn("News download failed", ex);
        return null;
    }
}

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From source file:UrlHelper.java

public static void downloadFile(String adresse, File dest) {
    BufferedReader reader = null;
    FileOutputStream fos = null;// ww w  .j a va2  s  . c o  m
    InputStream in = null;
    try {

        // cration de la connection
        URL url = new URL(adresse);
        URLConnection conn = url.openConnection();
        String FileType = conn.getContentType();

        int FileLenght = conn.getContentLength();
        if (FileLenght == -1) {
            throw new IOException("Fichier non valide.");
        }

        // lecture de la rponse
        in = conn.getInputStream();
        reader = new BufferedReader(new InputStreamReader(in));
        if (dest == null) {
            String FileName = url.getFile();
            FileName = FileName.substring(FileName.lastIndexOf('/') + 1);
            dest = new File(FileName);
        }
        fos = new FileOutputStream(dest);
        byte[] buff = new byte[1024];
        int l = in.read(buff);
        while (l > 0) {
            fos.write(buff, 0, l);
            l = in.read(buff);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            fos.flush();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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From source file:com.vaadin.tools.ReportUsage.java

private static void doHttpGet(String userAgent, String url) {
    Throwable caught;//from  www. j a  v a 2  s. co m
    InputStream is = null;
    try {
        URL urlToGet = new URL(url);
        URLConnection conn = urlToGet.openConnection();
        conn.setRequestProperty(USER_AGENT, userAgent);
        is = conn.getInputStream();
        // TODO use the results
        IOUtils.toByteArray(is);
        return;
    } catch (MalformedURLException e) {
        caught = e;
    } catch (IOException e) {
        caught = e;
    } finally {
        IOUtils.closeQuietly(is);
    }

    Logger.getLogger(ReportUsage.class.getName())
            .fine("Caught an exception while executing HTTP query: " + caught.getMessage());
}

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