Example usage for java.net URL openConnection

List of usage examples for java.net URL openConnection

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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:GetItemList.java

/**
 * Retrieve the contents of a URL/*from ww  w. ja v  a  2s .  co  m*/
 *
 */
public static String getPage(String path) throws Exception {
    // Create the URL from the given path
    URL url = new URL(path);

    // We won't bother checking that everything's okay
    URLConnection url_conn = url.openConnection();

    // Create a reader for the input stream
    BufferedReader read = new BufferedReader(new InputStreamReader(url_conn.getInputStream()));

    // read through each line and separate with the EOL string
    String out = "";
    String line = "";
    while ((line = read.readLine()) != null) {
        out += line + EOL_URL;
    }

    // Be sure to tidy up
    read.close();

    // Return the contents of the URL
    return out;
}

From source file:com.baidu.api.client.core.DownloadUtil.java

/**
 * Download the file pointed by the url and return the content as byte array.
 *
 * @param strUrl         The Url to be downloaded.
 * @param connectTimeout Connect timeout in milliseconds.
 * @param readTimeout    Read timeout in milliseconds.
 * @param maxFileSize    Max file size in BYTE.
 * @return The file content as byte array.
 *///  w ww  . j av  a  2  s .com
public static byte[] downloadFile(String strUrl, int connectTimeout, int readTimeout, int maxFileSize) {
    InputStream in = null;
    try {
        URL url = new URL(strUrl); // URL?
        URLConnection ucon = url.openConnection();
        ucon.setConnectTimeout(connectTimeout);
        ucon.setReadTimeout(readTimeout);
        ucon.connect();
        if (ucon.getContentLength() > maxFileSize) {
            String msg = "File " + strUrl + " size [" + ucon.getContentLength()
                    + "] too large, download stoped.";
            throw new ClientInternalException(msg);
        }
        if (ucon instanceof HttpURLConnection) {
            HttpURLConnection httpCon = (HttpURLConnection) ucon;
            if (httpCon.getResponseCode() > 399) {
                String msg = "Failed to download file " + strUrl + " server response "
                        + httpCon.getResponseMessage();
                throw new ClientInternalException(msg);
            }
        }
        in = ucon.getInputStream(); // ?
        byte[] byteBuf = new byte[BUFFER_SIZE];
        byte[] ret = null;
        int count, total = 0;
        // ??
        while ((count = in.read(byteBuf, total, BUFFER_SIZE - total)) > 0) {
            total += count;
            if (total + 124 >= BUFFER_SIZE)
                break;
        }
        if (total < BUFFER_SIZE - 124) {
            ret = ArrayUtils.subarray(byteBuf, 0, total);
        } else {
            ByteArrayOutputStream bos = new ByteArrayOutputStream(MATERIAL_SIZE);
            count = total;
            total = 0;
            do {
                bos.write(byteBuf, 0, count);
                total += count;
                if (total > maxFileSize) {
                    String msg = "File " + strUrl + " size exceed [" + maxFileSize + "] download stoped.";
                    throw new ClientInternalException(msg);
                }
            } while ((count = in.read(byteBuf)) > 0);
            ret = bos.toByteArray();
        }
        if (ret.length < MIN_SIZE) {
            String msg = "File " + strUrl + " size [" + maxFileSize + "] too small.";
            throw new ClientInternalException(msg);
        }
        return ret;
    } catch (IOException e) {
        String msg = "Failed to download file " + strUrl + " msg=" + e.getMessage();
        throw new ClientInternalException(msg);
    } finally {
        try {
            if (in != null)
                in.close();
        } catch (IOException e) {
            // ?
            System.out.println("Exception while close url - " + e.getMessage());
        }
    }
}

From source file:com.binil.pushnotification.ServerUtil.java

/**
 * Issue a POST request to the server.//from  w  w  w .j ava 2s  . c o m
 *
 * @param endpoint POST address.
 * @param params   request parameters.
 * @throws java.io.IOException propagated from POST.
 */
private static void post(String endpoint, Map<String, Object> params) throws IOException, JSONException {

    URL url = new URL(endpoint);
    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
    urlConnection.setRequestMethod("POST");
    urlConnection.setRequestProperty("Cache-Control", "no-cache");
    urlConnection.setRequestProperty("Content-Type", "application/json;charset=utf-8");
    urlConnection.setRequestProperty("Accept-Encoding", "gzip,deflate");
    urlConnection.setRequestProperty("Accept", "*/*");

    urlConnection.setDoOutput(true);

    JSONObject json = new JSONObject(params);
    String body = json.toString();
    urlConnection.setFixedLengthStreamingMode(body.length());

    try {
        OutputStream os = urlConnection.getOutputStream();
        os.write(body.getBytes("UTF-8"));
        os.close();

    } catch (Exception e) {
        e.printStackTrace();

    } finally {
        int status = urlConnection.getResponseCode();
        String connectionMsg = urlConnection.getResponseMessage();
        urlConnection.disconnect();

        if (status != HttpURLConnection.HTTP_OK) {
            Log.wtf(TAG, connectionMsg);
            throw new IOException("Post failed with error code " + status);
        }
    }

}

From source file:com.fun.util.TesseractUtil.java

/**
 * url?//  w  w w. ja  v  a 2  s . co  m
 *
 * @param url
 * @return
 * @throws IOException
 */
private static File getFileFromUrl(URL url) throws IOException {
    File tmpImage = File.createTempFile("tesseract-ocr-download", null);
    InputStream in = url.openConnection().getInputStream();
    FileOutputStream fos = new FileOutputStream(tmpImage);
    byte[] buf = new byte[1024];
    int len = 0;
    while ((len = in.read(buf)) != -1) {
        fos.write(buf, 0, len);
    }
    fos.flush();
    fos.close();
    return tmpImage;
}

From source file:ict.servlet.UploadToServer.java

public static int upLoad2Server(String sourceFileUri) {
    String upLoadServerUri = "http://vbacdu.ddns.net:8080/WBS/newjsp.jsp";
    // String [] string = sourceFileUri;
    String fileName = sourceFileUri;
    int serverResponseCode = 0;

    HttpURLConnection conn = null;
    DataOutputStream dos = null;/*from ww w  .ja va2s .c o  m*/
    DataInputStream inStream = null;
    String lineEnd = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    int bytesRead, bytesAvailable, bufferSize;
    byte[] buffer;
    int maxBufferSize = 1 * 1024 * 1024;
    String responseFromServer = "";

    File sourceFile = new File(sourceFileUri);
    if (!sourceFile.isFile()) {

        return 0;
    }
    try { // open a URL connection to the Servlet
        FileInputStream fileInputStream = new FileInputStream(sourceFile);
        URL url = new URL(upLoadServerUri);
        conn = (HttpURLConnection) url.openConnection(); // Open a HTTP  connection to  the URL
        conn.setDoInput(true); // Allow Inputs
        conn.setDoOutput(true); // Allow Outputs
        conn.setUseCaches(false); // Don't use a Cached Copy
        conn.setRequestMethod("POST");
        conn.setRequestProperty("Connection", "Keep-Alive");
        conn.setRequestProperty("ENCTYPE", "multipart/form-data");
        conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
        conn.setRequestProperty("uploaded_file", fileName);
        dos = new DataOutputStream(conn.getOutputStream());

        dos.writeBytes(twoHyphens + boundary + lineEnd);
        dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\"" + fileName + "\""
                + lineEnd);
        dos.writeBytes(lineEnd);

        bytesAvailable = fileInputStream.available(); // create a buffer of  maximum size

        bufferSize = Math.min(bytesAvailable, maxBufferSize);
        buffer = new byte[bufferSize];

        // read file and write it into form...
        bytesRead = fileInputStream.read(buffer, 0, bufferSize);

        while (bytesRead > 0) {
            dos.write(buffer, 0, bufferSize);
            bytesAvailable = fileInputStream.available();
            bufferSize = Math.min(bytesAvailable, maxBufferSize);
            bytesRead = fileInputStream.read(buffer, 0, bufferSize);
        }

        // send multipart form data necesssary after file data...
        dos.writeBytes(lineEnd);
        dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

        // Responses from the server (code and message)
        serverResponseCode = conn.getResponseCode();
        String serverResponseMessage = conn.getResponseMessage();

        m_log.info("Upload file to server" + "HTTP Response is : " + serverResponseMessage + ": "
                + serverResponseCode);
        // close streams
        m_log.info("Upload file to server" + fileName + " File is written");
        fileInputStream.close();
        dos.flush();
        dos.close();
    } catch (MalformedURLException ex) {
        //         ex.printStackTrace();
        m_log.error("Upload file to server" + "error: " + ex.getMessage(), ex);
    } catch (Exception e) {
        //      e.printStackTrace();
    }
    //this block will give the response of upload link
    /* try {
      BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = rd.readLine()) != null) {
      m_log.info("Huzza" + "RES Message: " + line);
      }
      rd.close();
      } catch (IOException ioex) {
      m_log.error("Huzza" + "error: " + ioex.getMessage(), ioex);
      }*/
    return serverResponseCode; // like 200 (Ok)

}

From source file:eu.scape_project.pit.util.FileUtils.java

/**
 * Read file of URL into file./*from  w w w. java 2  s .c om*/
 * @param url URL where the input file is located
 * @param ext 
 * @return Result file
 * @throws IOException 
 */
public static File urlToFile(URL url, String ext) throws IOException {
    File fOut = null;

    fOut = getTmpFile("fromurl", "." + ext);

    URLConnection uc = url.openConnection();
    logger.info("ContentType: " + uc.getContentType());
    InputStream in = uc.getInputStream();
    org.apache.commons.io.FileUtils.copyInputStreamToFile(in, fOut);
    logger.info("File of length " + fOut.length() + " created from URL " + url.toString());

    in.close();

    return fOut;
}

From source file:Main.java

public static String UdatePlayerBT(String userName, String device) {

    String retStr = "";

    try {//from   w  w w .  ja  v a 2 s .c  o m
        URL url = new URL("http://" + IP_ADDRESS + "/RiddleQuizApp/ServerSide/PostaviBTdevice.php");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(15000);
        conn.setReadTimeout(10000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);

        Log.e("http", "por1");

        JSONObject data = new JSONObject();

        data.put("username", userName);
        data.put("bt_device", device);

        Log.e("http", "por3");

        Uri.Builder builder = new Uri.Builder().appendQueryParameter("action", data.toString());
        String query = builder.build().getEncodedQuery();

        Log.e("http", "por4");

        OutputStream os = conn.getOutputStream();
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
        bw.write(query);
        Log.e("http", "por5");
        bw.flush();
        bw.close();
        os.close();
        int responseCode = conn.getResponseCode();

        Log.e("http", String.valueOf(responseCode));
        if (responseCode == HttpURLConnection.HTTP_OK) {
            retStr = inputStreamToString(conn.getInputStream());
        } else
            retStr = String.valueOf("Error: " + responseCode);

        Log.e("http", retStr);

    } catch (Exception e) {
        Log.e("http", "greska");
    }
    return retStr;
}

From source file:Main.java

public static String UpdateScore(String userName, int br) {

    String retStr = "";

    try {/*from w w  w  . j  a va  2s.  co m*/
        URL url = new URL("http://" + IP_ADDRESS + "/RiddleQuizApp/ServerSide/AzurirajHighScore.php");

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(15000);
        conn.setReadTimeout(10000);
        conn.setRequestMethod("POST");
        conn.setDoInput(true);
        conn.setDoOutput(true);
        Log.e("http", "por1");

        JSONObject data = new JSONObject();

        data.put("username", userName);
        data.put("broj", br);

        Log.e("http", "por3");

        Uri.Builder builder = new Uri.Builder().appendQueryParameter("action", data.toString());
        String query = builder.build().getEncodedQuery();

        Log.e("http", "por4");

        OutputStream os = conn.getOutputStream();
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
        bw.write(query);
        Log.e("http", "por5");
        bw.flush();
        bw.close();
        os.close();
        int responseCode = conn.getResponseCode();

        Log.e("http", String.valueOf(responseCode));
        if (responseCode == HttpURLConnection.HTTP_OK) {
            retStr = inputStreamToString(conn.getInputStream());
        } else
            retStr = String.valueOf("Error: " + responseCode);

        Log.e("http", retStr);

    } catch (Exception e) {
        Log.e("http", "greska");
    }
    return retStr;
}

From source file:com.arellomobile.android.push.utils.NetworkUtils.java

public static NetworkResult makeRequest(Map<String, Object> data, String methodName) throws Exception {
    NetworkResult result = new NetworkResult(500, null);
    OutputStream connectionOutput = null;
    InputStream inputStream = null;
    try {/* www.  j  a  va 2  s. c  om*/
        String urlString = NetworkUtils.BASE_URL + methodName;
        if (useSSL)
            urlString = NetworkUtils.BASE_URL_SECURE + methodName;

        URL url = new URL(urlString);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/json; charset=utf-8");

        connection.setDoOutput(true);

        JSONObject innerRequestJson = new JSONObject();

        for (String key : data.keySet()) {
            innerRequestJson.put(key, data.get(key));
        }

        JSONObject requestJson = new JSONObject();
        requestJson.put("request", innerRequestJson);

        connection.setRequestProperty("Content-Length",
                String.valueOf(requestJson.toString().getBytes().length));

        connectionOutput = connection.getOutputStream();
        connectionOutput.write(requestJson.toString().getBytes());
        connectionOutput.flush();
        connectionOutput.close();

        inputStream = new BufferedInputStream(connection.getInputStream());

        ByteArrayOutputStream dataCache = new ByteArrayOutputStream();

        // Fully read data
        byte[] buff = new byte[1024];
        int len;
        while ((len = inputStream.read(buff)) >= 0) {
            dataCache.write(buff, 0, len);
        }

        // Close streams
        dataCache.close();

        String jsonString = new String(dataCache.toByteArray()).trim();
        Log.w(TAG, "PushWooshResult: " + jsonString);

        JSONObject resultJSON = new JSONObject(jsonString);

        result.setData(resultJSON);
        result.setCode(resultJSON.getInt("status_code"));
    } finally {
        if (null != inputStream) {
            inputStream.close();
        }
        if (null != connectionOutput) {
            connectionOutput.close();
        }
    }

    return result;
}

From source file:com.netsteadfast.greenstep.util.FSUtils.java

/**
 * get MIME-TYPE // www .  j  a v a 2s. c o m
 * Using java.net.URL
 * 
 * @param file
 * @return
 * @throws Exception
 */
public static String getMimeType4URL(File file) throws IOException, MalformedURLException, Exception {
    String mimeType = "";
    if (file == null || !file.exists() || file.isDirectory()) {
        return mimeType;
    }
    URL url = new URL(file.getPath());
    URLConnection urlConnection = url.openConnection();
    mimeType = urlConnection.getContentType();
    return mimeType;
}