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:Main.java

public static File downloadFile(String urlstr, File saveFile) {
    try {/*from w  w w . j  a  v  a  2s.co  m*/
        URL url = new URL(urlstr);// cause speed low.
        URLConnection con = url.openConnection();
        con.setDoInput(true);
        con.connect();
        InputStream ins = con.getInputStream();
        final int bufsize = 102400;

        byte[] buffer = new byte[bufsize];
        int len = -1;
        FileOutputStream bos = new FileOutputStream(saveFile);
        while ((len = ins.read(buffer)) != -1) {
            bos.write(buffer, 0, len);

        }
        ins.close();
        bos.close();
        return saveFile;
    } catch (Error e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static String stringFromHttpGet(String urlString) {
    try {/*from w w w  . ja  v a2  s.c om*/
        URL url = new URL(urlString);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        return response.toString();
    } catch (Exception e) {
        e.printStackTrace();
        logError(e.getMessage());
        return null;
    }
}

From source file:Main.java

public static String requestData(String address) throws IOException {
    URL url = new URL(address);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("GET");
    connection.setConnectTimeout(5000);//from   ww  w. j  a  v  a  2 s  .c  om
    connection.setReadTimeout(5000);
    String data = null;
    InputStream is = null;
    if (connection.getResponseCode() == 200) {
        is = connection.getInputStream();
        data = readFromStream(is);
    }
    if (is != null) {
        is.close();
    }
    return data;
}

From source file:Main.java

public static boolean isAvailable(String urlString) throws IOException {
    try {//from ww w . j  a  v a  2 s.co  m
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        URL url = new URL(urlString);

        HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
        urlc.setRequestProperty("Connection", "close");
        urlc.setConnectTimeout(1000);
        urlc.connect();

        if (urlc.getResponseCode() == 200) {
            return true;
        } else {
            return false;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return false;
}

From source file:Main.java

/**
 * Gets an image from a url and returns it as an inputstream.
 * @param url The absolute url of the image
 * @return an inputstream containing the image
 *///  w w  w .  j av  a2 s. c om
public static InputStream getImageStream(URL stringUrl) {
    InputStream input = null;
    try {
        input = stringUrl.openConnection().getInputStream();
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
    return input;
}

From source file:Main.java

public static InputStream downloadFromURL(String urlString) {
    InputStream retval = null;/*from  w w w .  ja v a 2  s  .c  o m*/
    try {
        URL url = new URL(urlString);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        //URLConnection ucon = url.openConnection();
        con.setRequestMethod("GET");
        con.setDoInput(true);
        retval = con.getInputStream();
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return retval;
}

From source file:Main.java

public static void downloadResource(final String fileUrl) {
    new Thread(new Runnable() {

        @Override//from   w ww.  ja  va 2 s. c o m
        public void run() {
            inStream = null;
            isOver = false;
            try {
                URL url = new URL(fileUrl);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setConnectTimeout(5000);
                inStream = conn.getInputStream();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            isOver = true;
        }
    }).start();
}

From source file:Main.java

private static String connect(String uri, String charsetName) {
    String result = "";
    try {/* w w w .  j  av a2  s .  c om*/
        URL url = new URL(uri);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5 * 1000);
        if (Integer.parseInt(Build.VERSION.SDK) < 8) {
            System.setProperty("http.keepAlive", "false");
        }
        if (conn.getResponseCode() == 200) {
            InputStream is = conn.getInputStream();
            result = readData(is, charsetName);
        }
        conn.disconnect();
    } catch (MalformedURLException e) {
    } catch (IOException e) {
    } catch (Exception e) {
    }
    return result;
}

From source file:Main.java

public static String getResponse(String urlParam) {
    try {/*from  w  w w .ja v  a 2 s .  c  o m*/
        URL url = new URL(urlParam);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestProperty("accept", "*/*");
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE6.0; Windows NT 5.1; SV1)");
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
            InputStream inputStream = conn.getInputStream();
            return inputStream2String(inputStream);
        }
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
    return null;
}

From source file:Main.java

public static String stringFromHttpPost(String urlStr, String body) {
    HttpURLConnection conn;//  w  w w.java 2 s. c om
    try {
        URL e = new URL(urlStr);
        conn = (HttpURLConnection) e.openConnection();
        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setInstanceFollowRedirects(true);
        conn.setRequestMethod("POST");
        OutputStream os1 = conn.getOutputStream();
        DataOutputStream out1 = new DataOutputStream(os1);
        out1.write(body.getBytes("UTF-8"));
        out1.flush();
        conn.connect();
        String line;
        BufferedReader reader;
        StringBuffer sb = new StringBuffer();
        if ("gzip".equals(conn.getHeaderField("Content-Encoding"))) {
            reader = new BufferedReader(
                    new InputStreamReader(new GZIPInputStream(conn.getInputStream()), "UTF-8"));
        } else {
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
        }
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        return sb.toString();
    } catch (Exception e) {
        e.printStackTrace();
        logError(e.getMessage());
    }
    return null;
}