Example usage for java.net URLConnection connect

Introduction

In this page you can find the example usage for java.net URLConnection connect.

Prototype

public abstract void connect() throws IOException;

Source Link

Document

Opens a communications link to the resource referenced by this URL, if such a connection has not already been established.

Usage

From source file:Main.java

public static void main(String args[]) throws Exception {

    URL u = new URL("http://www.java2s.com");
    URLConnection uc = u.openConnection();
    uc.connect();
    System.out.println("Content-type: " + uc.getContentType());
    System.out.println("Content-encoding: " + uc.getContentEncoding());
    System.out.println("Date: " + new Date(uc.getDate()));
    System.out.println("Last modified: " + new Date(uc.getLastModified()));
    System.out.println("Expiration date: " + new Date(uc.getExpiration()));
    System.out.println("Content-length: " + uc.getContentLength());
}

From source file:Main.java

public static void main(String args[]) throws Exception {
    byte[] b = new byte[1];
    URL url = new URL("http://www.server.com/a.gif");
    URLConnection urlConnection = url.openConnection();
    urlConnection.connect();
    DataInputStream di = new DataInputStream(urlConnection.getInputStream());

    FileOutputStream fo = new FileOutputStream("a.gif");
    while (-1 != di.read(b, 0, 1))
        fo.write(b, 0, 1);/*from  w  w  w  . j  ava  2  s  .c  om*/
    di.close();
    fo.close();
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    URL url = new URL("http://hostname:80");
    URLConnection conn = url.openConnection();

    conn.setRequestProperty("Cookie", "name1=value1; name2=value2");

    conn.connect();
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    HttpURLConnection.setFollowRedirects(false);

    URL url = new URL("http://hostname:80");
    URLConnection conn = url.openConnection();

    HttpURLConnection httpConn = (HttpURLConnection) conn;
    httpConn.setInstanceFollowRedirects(false);

    conn.connect();
}

From source file:Main.java

License:asdf

public static void main(String[] argv) throws Exception {

    URLConnection conn = new URL("http://www.yourserver.com").openConnection();
    conn.setDoInput(true);//  w w w  . j av  a 2  s . c  o  m
    conn.setRequestProperty("Authorization", "asdfasdf");
    conn.connect();

    InputStream in = conn.getInputStream();
}

From source file:SendMail.java

public static void main(String[] args) {
    try {//from  w ww.  j ava 2  s  . c om
        // If the user specified a mailhost, tell the system about it.
        if (args.length >= 1)
            System.getProperties().put("mail.host", args[0]);

        // A Reader stream to read from the console
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

        // Ask the user for the from, to, and subject lines
        System.out.print("From: ");
        String from = in.readLine();
        System.out.print("To: ");
        String to = in.readLine();
        System.out.print("Subject: ");
        String subject = in.readLine();

        // Establish a network connection for sending mail
        URL u = new URL("mailto:" + to); // Create a mailto: URL
        URLConnection c = u.openConnection(); // Create its URLConnection
        c.setDoInput(false); // Specify no input from it
        c.setDoOutput(true); // Specify we'll do output
        System.out.println("Connecting..."); // Tell the user
        System.out.flush(); // Tell them right now
        c.connect(); // Connect to mail host
        PrintWriter out = // Get output stream to host
                new PrintWriter(new OutputStreamWriter(c.getOutputStream()));

        // We're talking to the SMTP server now.
        // Write out mail headers. Don't let users fake the From address
        out.print("From: \"" + from + "\" <" + System.getProperty("user.name") + "@"
                + InetAddress.getLocalHost().getHostName() + ">\r\n");
        out.print("To: " + to + "\r\n");
        out.print("Subject: " + subject + "\r\n");
        out.print("\r\n"); // blank line to end the list of headers

        // Now ask the user to enter the body of the message
        System.out.println("Enter the message. " + "End with a '.' on a line by itself.");
        // Read message line by line and send it out.
        String line;
        for (;;) {
            line = in.readLine();
            if ((line == null) || line.equals("."))
                break;
            out.print(line + "\r\n");
        }

        // Close (and flush) the stream to terminate the message
        out.close();
        // Tell the user it was successfully sent.
        System.out.println("Message sent.");
    } catch (Exception e) { // Handle any exceptions, print error message.
        System.err.println(e);
        System.err.println("Usage: java SendMail [<mailhost>]");
    }
}

From source file:URLConnectionTest.java

public static void main(String[] args) {
    try {/*from  www.  j  a  v a  2  s . c  o m*/
        String urlName;
        if (args.length > 0)
            urlName = args[0];
        else
            urlName = "http://java.sun.com";

        URL url = new URL(urlName);
        URLConnection connection = url.openConnection();

        // set username, password if specified on command line

        if (args.length > 2) {
            String username = args[1];
            String password = args[2];
            String input = username + ":" + password;
            String encoding = base64Encode(input);
            connection.setRequestProperty("Authorization", "Basic " + encoding);
        }

        connection.connect();

        // print header fields

        Map<String, List<String>> headers = connection.getHeaderFields();
        for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
            String key = entry.getKey();
            for (String value : entry.getValue())
                System.out.println(key + ": " + value);
        }

        // print convenience functions

        System.out.println("----------");
        System.out.println("getContentType: " + connection.getContentType());
        System.out.println("getContentLength: " + connection.getContentLength());
        System.out.println("getContentEncoding: " + connection.getContentEncoding());
        System.out.println("getDate: " + connection.getDate());
        System.out.println("getExpiration: " + connection.getExpiration());
        System.out.println("getLastModifed: " + connection.getLastModified());
        System.out.println("----------");

        Scanner in = new Scanner(connection.getInputStream());

        // print first ten lines of contents

        for (int n = 1; in.hasNextLine() && n <= 10; n++)
            System.out.println(in.nextLine());
        if (in.hasNextLine())
            System.out.println(". . .");
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:com.maverick.ssl.SSLSocket.java

public static void main(String[] args) {

    try {/*from  w  ww.j a va2s.co m*/

        HttpsURLStreamHandlerFactory.addHTTPSSupport();

        URL url = new URL("https://localhost"); //$NON-NLS-1$

        URLConnection con = url.openConnection();
        con.setDoInput(true);
        con.setDoOutput(false);
        con.setAllowUserInteraction(false);

        con.setRequestProperty("Accept", //$NON-NLS-1$
                "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*"); //$NON-NLS-1$
        con.setRequestProperty("Accept-Encoding", "gzip, deflate"); //$NON-NLS-1$ //$NON-NLS-2$
        con.setRequestProperty("Accept-Language", "en-gb"); //$NON-NLS-1$ //$NON-NLS-2$
        con.setRequestProperty("Connection", "Keep-Alive"); //$NON-NLS-1$ //$NON-NLS-2$
        con.setRequestProperty("User-Agent", //$NON-NLS-1$
                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)"); //$NON-NLS-1$

        con.connect();

        InputStream in = con.getInputStream();
        int read;

        while ((read = in.read()) > -1) {
            System.out.write(read);
        }

    } catch (SSLIOException ex) {
        ex.getRealException().printStackTrace();
    } catch (IOException ex) {
        ex.printStackTrace();
    }

}

From source file:GetURLInfo.java

/** Use the URLConnection class to get info about the URL */
public static void printinfo(URL url) throws IOException {
    URLConnection c = url.openConnection(); // Get URLConnection from URL
    c.connect(); // Open a connection to URL

    // Display some information about the URL contents
    System.out.println("  Content Type: " + c.getContentType());
    System.out.println("  Content Encoding: " + c.getContentEncoding());
    System.out.println("  Content Length: " + c.getContentLength());
    System.out.println("  Date: " + new Date(c.getDate()));
    System.out.println("  Last Modified: " + new Date(c.getLastModified()));
    System.out.println("  Expiration: " + new Date(c.getExpiration()));

    // If it is an HTTP connection, display some additional information.
    if (c instanceof HttpURLConnection) {
        HttpURLConnection h = (HttpURLConnection) c;
        System.out.println("  Request Method: " + h.getRequestMethod());
        System.out.println("  Response Message: " + h.getResponseMessage());
        System.out.println("  Response Code: " + h.getResponseCode());
    }/*from www  .  j  a  v a2  s .  c  o m*/
}

From source file:Main.java

public static Drawable getDrawable(String urlpath) {
    Drawable d = null;//from   w ww.  j  a  v a 2s.  c  o m
    try {
        URL url = new URL(urlpath);
        URLConnection conn = url.openConnection();
        conn.connect();
        InputStream in;
        in = conn.getInputStream();
        d = Drawable.createFromStream(in, "background.jpg");
        // TODO Auto-generated catch block
    } catch (IOException e) {
        e.printStackTrace();
    }
    return d;
}