Examples of java.net.URLConnection.connect()

java.net.URLConnection.connect()
Opens a communications link to the resource referenced by this URL, if such a connection has not already been established.
If the connect method is called when the connection has already been opened (indicated by the connected field having the value true), the call is ignored.
URLConnection objects go through two phases: first they are created, then they are connected. After being created, and before being connected, various options can be specified (e.g., doInput and UseCaches). After connecting, it is an error to try to set them. Operations that depend on being connected, like getContentLength, will implicitly perform the connection, if necessary. @throws SocketTimeoutException if the timeout expires beforethe connection can be established @exception IOException if an I/O error occurs while opening theconnection. @see java.net.URLConnection#connected @see #getConnectTimeout() @see #setConnectTimeout(int)

     * @tests java.net.URLConnection#getRequestProperties()
     */
    public void test_getRequestProperties_Exception() throws IOException {
        URL url = new URL("http", "test", 80, "index.html", new NewHandler());
        URLConnection urlCon = url.openConnection();       
        urlCon.connect();
        
        try {
            urlCon.getRequestProperties();
            fail("should throw IllegalStateException");
        } catch (IllegalStateException e) {

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        URL url = new URL("http", "test", 80, "index.html", new NewHandler());
        URLConnection urlCon = url.openConnection();
        urlCon.setRequestProperty("test", "testProperty");
        assertNull(urlCon.getRequestProperty("test"));
        
        urlCon.connect();
        try {
            urlCon.getRequestProperty("test");
            fail("should throw IllegalStateException");
        } catch (IllegalStateException e) {
            // expected

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        // Read the composite file and write to response
        response.setContentType("text/xml");
        URLConnection connection = new URL(uri).openConnection();
        connection.setUseCaches(false);
        connection.connect();
        InputStream is = connection.getInputStream();
        ServletOutputStream os = response.getOutputStream();
        byte[] buffer = new byte[4096];
        for (;;) {
            int n = is.read(buffer);

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            }
            
            // Read the file and write to response 
            URLConnection connection = uri.toURL().openConnection();
            connection.setUseCaches(false);
            connection.connect();
            InputStream is = connection.getInputStream();
            ServletOutputStream os = response.getOutputStream();
            byte[] buffer = new byte[4096];
            for (;;) {
                int n = is.read(buffer);

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            }


            URLConnection conn = configURL.openConnection();


            conn.setUseCaches(false);
            conn.connect();
            obj = digester.parse(conn.getInputStream());
        } catch (IOException e) {
            // TODO Internationalize msg
            log.error("Exception processing config", e);
            throw new ServletException(e);

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                (HttpServletRequest) pageContext.getRequest();


            addCookie(conn, urlString, request);


            // Connect to the requested resource
            conn.connect();
        } catch (Exception e) {
            TagUtils.getInstance().saveException(pageContext, e);
            throw new JspException(messages.getMessage("include.open",
                    url.toString(), e.toString()));
        }

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            connection.setRequestProperty ("Authorization",
                    "Basic " + encoding);
        }


        //connect to the remote site (may take some time)
        connection.connect();
        //next test for a 304 result (HTTP only)
        if (connection instanceof HttpURLConnection) {
            HttpURLConnection httpConnection
                    = (HttpURLConnection) connection;
            long lastModified = httpConnection.getLastModified();

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        OutputStream os = uc.getOutputStream();
        p.writePacket(os);
        os.close();


        uc.connect();


        int response = HttpURLConnection.HTTP_OK;


        if (uc instanceof HttpURLConnection) {
            response = ((HttpURLConnection) uc).getResponseCode();

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    public boolean installIfNecessaryFrom(URL archive, TaskListener listener, String message) throws IOException, InterruptedException {
        try {
            URLConnection con;
            try {
                con = ProxyConfiguration.open(archive);
                con.connect();
            } catch (IOException x) {
                if (this.exists()) {
                    // Cannot connect now, so assume whatever was last unpacked is still OK.
                    if (listener != null) {
                        listener.getLogger().println("Skipping installation of " + archive + " to " + remote + ": " + x);

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        }


        public FormValidation doCheckUrl(@QueryParameter String value) {
            try {
                URLConnection conn = ProxyConfiguration.open(new URL(value));
                conn.connect();
                if (conn instanceof HttpURLConnection) {
                    if (((HttpURLConnection) conn).getResponseCode() != HttpURLConnection.HTTP_OK) {
                        return FormValidation.error(Messages.ZipExtractionInstaller_bad_connection());
                    }
                }

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