List of usage examples for java.nio.channels ServerSocketChannel open
public static ServerSocketChannel open() throws IOException
From source file:DaytimeServer.java
public static void main(String args[]) { try { // Handle startup exceptions at the end of this block // Get an encoder for converting strings to bytes CharsetEncoder encoder = Charset.forName("US-ASCII").newEncoder(); // Allow an alternative port for testing with non-root accounts int port = 13; // RFC867 specifies this port. if (args.length > 0) port = Integer.parseInt(args[0]); // The port we'll listen on SocketAddress localport = new InetSocketAddress(port); // Create and bind a tcp channel to listen for connections on. ServerSocketChannel tcpserver = ServerSocketChannel.open(); tcpserver.socket().bind(localport); // Also create and bind a DatagramChannel to listen on. DatagramChannel udpserver = DatagramChannel.open(); udpserver.socket().bind(localport); // Specify non-blocking mode for both channels, since our // Selector object will be doing the blocking for us. tcpserver.configureBlocking(false); udpserver.configureBlocking(false); // The Selector object is what allows us to block while waiting // for activity on either of the two channels. Selector selector = Selector.open(); // Register the channels with the selector, and specify what // conditions (a connection ready to accept, a datagram ready // to read) we'd like the Selector to wake up for. // These methods return SelectionKey objects, which we don't // need to retain in this example. tcpserver.register(selector, SelectionKey.OP_ACCEPT); udpserver.register(selector, SelectionKey.OP_READ); // This is an empty byte buffer to receive emtpy datagrams with. // If a datagram overflows the receive buffer size, the extra bytes // are automatically discarded, so we don't have to worry about // buffer overflow attacks here. ByteBuffer receiveBuffer = ByteBuffer.allocate(0); // Now loop forever, processing client connections for (;;) { try { // Handle per-connection problems below // Wait for a client to connect selector.select();//from w w w .j a v a 2 s . co m // If we get here, a client has probably connected, so // put our response into a ByteBuffer. String date = new java.util.Date().toString() + "\r\n"; ByteBuffer response = encoder.encode(CharBuffer.wrap(date)); // Get the SelectionKey objects for the channels that have // activity on them. These are the keys returned by the // register() methods above. They are returned in a // java.util.Set. Set keys = selector.selectedKeys(); // Iterate through the Set of keys. for (Iterator i = keys.iterator(); i.hasNext();) { // Get a key from the set, and remove it from the set SelectionKey key = (SelectionKey) i.next(); i.remove(); // Get the channel associated with the key Channel c = (Channel) key.channel(); // Now test the key and the channel to find out // whether something happend on the TCP or UDP channel if (key.isAcceptable() && c == tcpserver) { // A client has attempted to connect via TCP. // Accept the connection now. SocketChannel client = tcpserver.accept(); // If we accepted the connection successfully, // the send our respone back to the client. if (client != null) { client.write(response); // send respone client.close(); // close connection } } else if (key.isReadable() && c == udpserver) { // A UDP datagram is waiting. Receive it now, // noting the address it was sent from. SocketAddress clientAddress = udpserver.receive(receiveBuffer); // If we got the datagram successfully, send // the date and time in a response packet. if (clientAddress != null) udpserver.send(response, clientAddress); } } } catch (java.io.IOException e) { // This is a (hopefully transient) problem with a single // connection: we log the error, but continue running. // We use our classname for the logger so that a sysadmin // can configure logging for this server independently // of other programs. Logger l = Logger.getLogger(DaytimeServer.class.getName()); l.log(Level.WARNING, "IOException in DaytimeServer", e); } catch (Throwable t) { // If anything else goes wrong (out of memory, for example) // then log the problem and exit. Logger l = Logger.getLogger(DaytimeServer.class.getName()); l.log(Level.SEVERE, "FATAL error in DaytimeServer", t); System.exit(1); } } } catch (Exception e) { // This is a startup error: there is no need to log it; // just print a message and exit System.err.println(e); System.exit(1); } }
From source file:PrintServiceWebInterface.java
public static void main(String[] args) throws IOException { // Get the character encoders and decoders we'll need Charset charset = Charset.forName("ISO-8859-1"); CharsetEncoder encoder = charset.newEncoder(); // The HTTP headers we send back to the client are fixed String headers = "HTTP/1.1 200 OK\r\n" + "Content-type: text/html\r\n" + "Connection: close\r\n" + "\r\n"; // We'll use two buffers in our response. One holds the fixed // headers, and the other holds the variable body of the response. ByteBuffer[] buffers = new ByteBuffer[2]; buffers[0] = encoder.encode(CharBuffer.wrap(headers)); ByteBuffer body = ByteBuffer.allocateDirect(16 * 1024); buffers[1] = body;/*ww w. j a v a2 s. c o m*/ // Find all available PrintService objects to describe PrintService[] services = PrintServiceLookup.lookupPrintServices(null, null); // All of the channels we use in this code will be in non-blocking // mode. So we create a Selector object that will block while // monitoring all of the channels and will only stop blocking when // one or more of the channels is ready for I/O of some sort. Selector selector = Selector.open(); // Create a new ServerSocketChannel, and bind it to port 8000. // Note that we have to do this using the underlying ServerSocket. ServerSocketChannel server = ServerSocketChannel.open(); server.socket().bind(new java.net.InetSocketAddress(8000)); // Put the ServerSocketChannel into non-blocking mode server.configureBlocking(false); // Now register the channel with the Selector. The SelectionKey // represents the registration of this channel with this Selector. SelectionKey serverkey = server.register(selector, SelectionKey.OP_ACCEPT); for (;;) { // The main server loop. The server runs forever. // This call blocks until there is activity on one of the // registered channels. This is the key method in non-blocking I/O. selector.select(); // Get a java.util.Set containing the SelectionKey objects for // all channels that are ready for I/O. Set keys = selector.selectedKeys(); // Use a java.util.Iterator to loop through the selected keys for (Iterator i = keys.iterator(); i.hasNext();) { // Get the next SelectionKey in the set, and then remove it // from the set. It must be removed explicitly, or it will // be returned again by the next call to select(). SelectionKey key = (SelectionKey) i.next(); i.remove(); // Check whether this key is the SelectionKey we got when // we registered the ServerSocketChannel. if (key == serverkey) { // Activity on the ServerSocketChannel means a client // is trying to connect to the server. if (key.isAcceptable()) { // Accept the client connection, and obtain a // SocketChannel to communicate with the client. SocketChannel client = server.accept(); // Make sure we actually got a connection if (client == null) continue; // Put the client channel in non-blocking mode. client.configureBlocking(false); // Now register the client channel with the Selector, // specifying that we'd like to know when there is // data ready to read on the channel. SelectionKey clientkey = client.register(selector, SelectionKey.OP_READ); } } else { // If the key we got from the Set of keys is not the // ServerSocketChannel key, then it must be a key // representing one of the client connections. // Get the channel from the key. SocketChannel client = (SocketChannel) key.channel(); // If we got here, it should mean that there is data to // be read from the channel, but we double-check here. if (!key.isReadable()) continue; // Now read bytes from the client. We assume that // we get all the client's bytes in one read operation client.read(body); // The data we read should be some kind of HTTP GET // request. We don't bother checking it however since // there is only one page of data we know how to return. body.clear(); // Build an HTML document as our reponse. // The body of the document contains PrintService details StringBuffer response = new StringBuffer(); response.append( "<html><head><title>Printer Status</title></head>" + "<body><h1>Printer Status</h1>"); for (int s = 0; s < services.length; s++) { PrintService service = services[s]; response.append("<h2>").append(service.getName()).append("</h2><table>"); Attribute[] attrs = service.getAttributes().toArray(); for (int a = 0; a < attrs.length; a++) { Attribute attr = attrs[a]; response.append("<tr><td>").append(attr.getName()).append("</td><td>").append(attr) .append("</tr>"); } response.append("</table>"); } response.append("</body></html>\r\n"); // Encode the response into the body ByteBuffer encoder.reset(); encoder.encode(CharBuffer.wrap(response), body, true); encoder.flush(body); body.flip(); // Prepare the body buffer to be drained // While there are bytes left to write while (body.hasRemaining()) { // Write both header and body buffers client.write(buffers); } buffers[0].flip(); // Prepare header buffer for next write body.clear(); // Prepare body buffer for next read // Once we've sent our response, we have no more interest // in the client channel or its SelectionKey client.close(); // Close the channel. key.cancel(); // Tell Selector to stop monitoring it. } } } }
From source file:com.l2jfree.network.mmocore.AcceptorThread.java
public void openServerSocket(InetAddress address, int port) throws IOException { ServerSocketChannel selectable = ServerSocketChannel.open(); selectable.configureBlocking(false); ServerSocket ss = selectable.socket(); ss.setReuseAddress(true);// w w w. ja v a 2s . c o m ss.setReceiveBufferSize(getBufferSize()); if (address == null) { ss.bind(new InetSocketAddress(port)); } else { ss.bind(new InetSocketAddress(address, port)); } selectable.register(getSelector(), SelectionKey.OP_ACCEPT); }
From source file:org.veronicadb.core.server.VServer.java
public VServer() throws IOException, ConfigurationException { try {//from ww w . ja v a 2s. c om this.port = ConfigurationManager.getInstance().getConfig().getInt(PROP_BIND_PORT, 7992); } catch (ConfigurationException | URISyntaxException e) { throw new ConfigurationException(e); } this.channel = ServerSocketChannel.open(); }
From source file:org.commoncrawl.io.internal.NIOServerTCPSocket.java
public void open(InetSocketAddress address) throws IOException { if (_channel != null) { throw new IOException("Invalid State. Socket already bound"); }//w w w .ja v a 2 s . c om LOG.info(this + " Binding to: " + address.getAddress().getHostAddress() + ":" + address.getPort()); _channel = ServerSocketChannel.open(); setListenerSocketOptions(_channel); _channel.socket().bind(address); }
From source file:me.xingrz.prox.tcp.TcpProxy.java
@Override protected ServerSocketChannel createChannel(Selector selector) throws IOException { ServerSocketChannel channel = ServerSocketChannel.open(); channel.configureBlocking(false);/*from w w w . jav a2 s . c om*/ channel.socket().bind(new InetSocketAddress(0)); channel.register(selector, SelectionKey.OP_ACCEPT, this); return channel; }
From source file:com.github.neoio.nio.util.NIOUtils.java
public static ServerSocketChannel openServerSocket(Selector selector, SocketAddress socketAddress) throws NetSocketException { ServerSocketChannel toReturn; try {//from w ww .ja v a 2 s .co m toReturn = ServerSocketChannel.open(); toReturn.socket().bind(socketAddress); toReturn.configureBlocking(false); toReturn.register(selector, SelectionKey.OP_ACCEPT); } catch (IOException e) { logger.error("IOException occurred while opening server socket", e); toReturn = null; } return toReturn; }
From source file:net.ymate.platform.serv.nio.support.NioEventGroup.java
protected SelectableChannel __doChannelCreate(INioServerCfg cfg) throws IOException { ServerSocketChannel _channel = ServerSocketChannel.open(); _channel.configureBlocking(false);/* w ww .j a v a 2 s . c o m*/ _channel.socket().bind(new InetSocketAddress(cfg.getServerHost(), cfg.getPort())); return _channel; }
From source file:com.byteatebit.nbserver.simple.tcp.TcpConnectorFactory.java
@Override public IConnector create(ISelectorRegistrarBalancer selectorRegistrarBalancer, IComputeTaskScheduler taskScheduler, SocketAddress listenAddress) throws IOException { Preconditions.checkNotNull(selectorRegistrarBalancer, "selectorRegistrarBalancer cannot be null"); Preconditions.checkNotNull(taskScheduler, "taskScheduler cannot be null"); Preconditions.checkNotNull(listenAddress, "listenAddress cannot be null"); // open the server socketChannel ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); serverSocketChannel.configureBlocking(false); IOTimeoutTask timeoutTask = (selectionKey, ops) -> { LOG.error("selectionKey timeout"); selectionKey.cancel();//from ww w. j a va 2s . c o m IOUtils.closeQuietly(selectionKey.channel()); }; for (SocketOptionValue socketOptionValue : socketOptionValues) serverSocketChannel.setOption(socketOptionValue.getOption(), socketOptionValue.getValue()); SelectionKey serverSocketSelectionKey = selectorRegistrarBalancer.getSelectorRegistrar().register( serverSocketChannel, SelectionKey.OP_ACCEPT, selectionKey -> connectHandler.accept( new NbContext(selectorRegistrarBalancer.getSelectorRegistrar(), taskScheduler), selectionKey, serverSocketChannel), timeoutTask, -1); serverSocketChannel.socket().bind(listenAddress, maxServerSocketBacklog); return new TcpConnector(serverSocketSelectionKey, serverSocketChannel); }
From source file:org.jnode.net.NServerSocket.java
private CompletableFuture<ServerSocketChannel> createServerChannel(int port) { CompletableFuture cf = new CompletableFuture<>(); try {//from w w w.j a v a 2 s. co m ServerSocketChannel ssc = ServerSocketChannel.open(); ssc.configureBlocking(false); ssc.socket().bind(new InetSocketAddress(port)); cf.complete(ssc); } catch (Exception e) { cf.completeExceptionally(e); } return cf; }