Examples of java.net.ProxySelector

java.net.ProxySelector
Selects the proxy server to use, if any, when connecting to the network resource referenced by a URL. A proxy selector is a concrete sub-class of this class and is registered by invoking the {@link java.net.ProxySelector#setDefault setDefault} method. Thecurrently registered proxy selector can be retrieved by calling {@link java.net.ProxySelector#getDefault getDefault} method.
When a proxy selector is registered, for instance, a subclass of URLConnection class should call the {@link #select select}method for each URL request so that the proxy selector can decide if a direct, or proxied connection should be used. The {@link #select select} method returns an iterator over a collection withthe preferred connection approach.
If a connection cannot be established to a proxy (PROXY or SOCKS) servers then the caller should call the proxy selector's {@link #connectFailed connectFailed} method to notify the proxyselector that the proxy server is unavailable.
@version 1.3, 03/08/09 @author Yingxian Wang @author Jean-Christophe Collet @since 1.5

            // IOException will be thrown in the case of failure
            connection = getHTTPConnection(proxy);
        } else {
            // Use system-wide ProxySelect to select proxy list,
            // then try to connect via elements in the proxy list.
            ProxySelector selector = ProxySelector.getDefault();
            List<Proxy> proxyList = selector.select(uri);
            if (proxyList != null) {
                for (Proxy selectedProxy : proxyList) {
                    if (selectedProxy.type() == Proxy.Type.DIRECT) {
                        // the same as NO_PROXY
                        continue;
                    }
                    try {
                        connection = getHTTPConnection(selectedProxy);
                        proxy = selectedProxy;
                        break; // connected
                    } catch (IOException e) {
                        // failed to connect, tell it to the selector
                        selector.connectFailed(uri, selectedProxy.address(), e);
                    }
                }
            }
        }
        if (connection == null) {

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  private void doGetByHttp() throws IOException {
    System.err.print("Downloading " + jarUrl + " ...");
    System.err.flush();
    try {
      final ProxySelector proxySelector = ProxySelector.getDefault();
      final URL url = new URL(jarUrl);
      final Proxy proxy = HttpSupport.proxyFor(proxySelector, url);
      final HttpURLConnection c = (HttpURLConnection) url.openConnection(proxy);
      final InputStream in;

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            if (instProxy == null) { // no instance Proxy is set
                /**
                 * Do we have to use a proxy?
                 */
                ProxySelector sel = (ProxySelector)
                    java.security.AccessController.doPrivileged(
                             new java.security.PrivilegedAction() {
                                 public Object run() {
                                     return ProxySelector.getDefault();
                                 }
                             });
                Proxy p = null;
                if (sel != null) {
                    URI uri = sun.net.www.ParseUtil.toURI(url);
                    Iterator<Proxy> it = sel.select(uri).iterator();
                    while (it.hasNext()) {
                        p = it.next();
                        try {
                            if (!failedOnce) {
                                http = getNewHttpClient(url, p, connectTimeout);
                                http.setReadTimeout(readTimeout);
                            } else {
                                // make sure to construct new connection if first
                                // attempt failed
                                http = getNewHttpClient(url, p, connectTimeout, false);
                                http.setReadTimeout(readTimeout);
                            }
                            break;
                        } catch (IOException ioex) {
                            if (p != Proxy.NO_PROXY) {
                                sel.connectFailed(uri, p.address(), ioex);
                                if (!it.hasNext()) {
                                    // fallback to direct connection
                                    http = getNewHttpClient(url, null, connectTimeout, false);
                                    http.setReadTimeout(readTimeout);
                                    break;

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                LOGGER.log(Level.WARNING, String.format("Invalid proxy '%s'.", proxyString), e);
            }
        }


        // ProxySelector
        final ProxySelector proxySelector = ProxySelector.getDefault();


        // see WebSocket Protocol RFC, chapter 4.1.3: http://tools.ietf.org/html/rfc6455#section-4.1
        addProxies(proxySelector, uri, "socket", proxies);
        addProxies(proxySelector, uri, "https", proxies);
        addProxies(proxySelector, uri, "http", proxies);

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    /**
     * Get the diagnostics for proxy information.
     * @return the information.
     */
    public String toString() {
        ProxySelector selector = ProxySelector.getDefault();
        List list = selector.select(destURI);
        StringBuffer result = new StringBuffer();
        Iterator proxies = list.listIterator();
        while (proxies.hasNext()) {
            Proxy proxy = (Proxy) proxies.next();
            SocketAddress address = proxy.address();

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        }
        if (null == proxyList) {
            currentProxy = null;
            connectInternal();
        } else {
            ProxySelector selector = ProxySelector.getDefault();
            Iterator<Proxy> iter = proxyList.iterator();
            boolean connectOK = false;
            String failureReason = ""; //$NON-NLS-1$
            while (iter.hasNext() && !connectOK) {
                currentProxy = iter.next();
                try {
                    connectInternal();
                    connectOK = true;
                } catch (IOException ioe) {
                    failureReason = ioe.getLocalizedMessage();
                    // If connect failed, callback "connectFailed"
                    // should be invoked.
                    if (null != selector && Proxy.NO_PROXY != currentProxy) {
                        selector.connectFailed(uri, currentProxy.address(), ioe);
                    }
                }
            }
            if (!connectOK) {
                // luni.1D=Unable to connect to server\: {0}

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            // IOException will be thrown in the case of failure
            connection = getHTTPConnection(proxy);
        } else {
            // Use system-wide ProxySelect to select proxy list,
            // then try to connect via elements in the proxy list.
            ProxySelector selector = ProxySelector.getDefault();
            List<Proxy> proxyList = selector.select(uri);
            if (proxyList != null) {
                for (Proxy selectedProxy : proxyList) {
                    if (selectedProxy.type() == Proxy.Type.DIRECT) {
                        // the same as NO_PROXY
                        continue;
                    }
                    try {
                        connection = getHTTPConnection(selectedProxy);
                        proxy = selectedProxy;
                        break; // connected
                    } catch (IOException e) {
                        // failed to connect, tell it to the selector
                        selector.connectFailed(uri, selectedProxy.address(), e);
                    }
                }
            }
        }
        if (connection == null) {

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        }
        if (null == proxyList) {
            currentProxy = null;
            connectInternal();
        } else {
            ProxySelector selector = ProxySelector.getDefault();
            Iterator<Proxy> iter = proxyList.iterator();
            boolean connectOK = false;
            String failureReason = ""; //$NON-NLS-1$
            while (iter.hasNext() && !connectOK) {
                currentProxy = iter.next();
                try {
                    connectInternal();
                    connectOK = true;
                } catch (IOException ioe) {
                    failureReason = ioe.getLocalizedMessage();
                    // If connect failed, callback "connectFailed"
                    // should be invoked.
                    if (null != selector && Proxy.NO_PROXY != currentProxy) {
                        selector.connectFailed(uri, currentProxy.address(), ioe);
                    }
                }
            }
            if (!connectOK) {
                // K0097=Unable to connect to server\: {0}

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                + Support_Configuration.ProxyServerTestHost
                + "/cgi-bin/test.pl");
        URL ftpUrl = new URL("ftp://" + Support_Configuration.FTPTestAddress
                + "/nettest.txt");
        URL[] urlList = { httpUrl, ftpUrl };
        ProxySelector originalSelector = ProxySelector.getDefault();
        ProxySelector.setDefault(new MockProxySelector());
        try {
            for (int i = 0; i < urlList.length; ++i) {
                try {
                    isSelectCalled = false;

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            // IOException will be thrown in the case of failure
            connection = getHTTPConnection(proxy);
        } else {
            // Use system-wide ProxySelect to select proxy list,
            // then try to connect via elements in the proxy list.
            ProxySelector selector = ProxySelector.getDefault();
            List<Proxy> proxyList = selector.select(uri);
            if (proxyList != null) {
                for (Proxy selectedProxy : proxyList) {
                    if (selectedProxy.type() == Proxy.Type.DIRECT) {
                        // the same as NO_PROXY
                        continue;
                    }
                    try {
                        connection = getHTTPConnection(selectedProxy);
                        proxy = selectedProxy;
                        break; // connected
                    } catch (IOException e) {
                        // failed to connect, tell it to the selector
                        selector.connectFailed(uri, selectedProxy.address(), e);
                    }
                }
            }
        }
        if (connection == null) {

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