List of usage examples for java.nio.channels SocketChannel close
public final void close() throws IOException
From source file:MainClass.java
public static void main(String[] args) throws Exception { CharsetEncoder encoder = Charset.forName("US-ASCII").newEncoder(); ServerSocketChannel server = ServerSocketChannel.open(); server.socket().bind(new java.net.InetSocketAddress(8000)); for (;;) { // This server runs forever SocketChannel client = server.accept(); String response = new java.util.Date().toString() + "\r\n"; client.write(encoder.encode(CharBuffer.wrap(response))); client.close(); }//from w ww . ja v a2 s . c om }
From source file:Main.java
public static void main(String[] argv) throws Exception { ByteBuffer buf = ByteBuffer.allocateDirect(1024); SocketChannel sChannel = SocketChannel.open(); sChannel.configureBlocking(false);/*from w ww. j a va 2 s . c om*/ sChannel.connect(new InetSocketAddress("hostName", 12345)); int numBytesRead = sChannel.read(buf); if (numBytesRead == -1) { sChannel.close(); } else { buf.flip(); } }
From source file:Main.java
public static void main(String[] argv) throws Exception { Selector selector = Selector.open(); ServerSocketChannel ssChannel1 = ServerSocketChannel.open(); ssChannel1.configureBlocking(false); ssChannel1.socket().bind(new InetSocketAddress(80)); ServerSocketChannel ssChannel2 = ServerSocketChannel.open(); ssChannel2.configureBlocking(false); ssChannel2.socket().bind(new InetSocketAddress(81)); ssChannel1.register(selector, SelectionKey.OP_ACCEPT); ssChannel2.register(selector, SelectionKey.OP_ACCEPT); while (true) { selector.select();/*from w ww . j a v a 2s . c o m*/ Iterator it = selector.selectedKeys().iterator(); while (it.hasNext()) { SelectionKey selKey = (SelectionKey) it.next(); it.remove(); if (selKey.isAcceptable()) { ServerSocketChannel ssChannel = (ServerSocketChannel) selKey.channel(); SocketChannel sc = ssChannel.accept(); ByteBuffer buf = ByteBuffer.allocate(100); int numBytesRead = sc.read(buf); if (numBytesRead == -1) { sc.close(); } else { // Read the bytes from the buffer } int numBytesWritten = sc.write(buf); } } } }
From source file:MainClass.java
public static void main(String[] argv) throws Exception { int port = 1234; // default ByteBuffer buffer = ByteBuffer.wrap(GREETING.getBytes()); ServerSocketChannel ssc = ServerSocketChannel.open(); ssc.socket().bind(new InetSocketAddress(port)); ssc.configureBlocking(false);/*w w w. j a va2 s.co m*/ while (true) { System.out.println("Waiting for connections"); SocketChannel sc = ssc.accept(); if (sc == null) { Thread.sleep(2000); } else { System.out.println("Incoming connection from: " + sc.socket().getRemoteSocketAddress()); buffer.rewind(); sc.write(buffer); sc.close(); } } }
From source file:MainClass.java
public static void main(String[] argv) throws Exception { String host = "localhost"; int port = 80; InetSocketAddress addr = new InetSocketAddress(host, port); SocketChannel sc = SocketChannel.open(); sc.configureBlocking(false);/* w ww . j a v a 2 s . c om*/ System.out.println("initiating connection"); sc.connect(addr); while (!sc.finishConnect()) { System.out.println("doing something useless"); } System.out.println("connection established"); sc.close(); }
From source file:SimpleDaytimeServer.java
public static void main(String args[]) throws java.io.IOException { // RFC867 specifies port 13 for this service. On Unix platforms, // you need to be running as root to use that port, so we allow // this service to use other ports for testing. int port = 13; if (args.length > 0) port = Integer.parseInt(args[0]); // Create a channel to listen for connections on. ServerSocketChannel server = ServerSocketChannel.open(); // Bind the channel to a local port. Note that we do this by obtaining // the underlying java.net.ServerSocket and binding that socket. server.socket().bind(new InetSocketAddress(port)); // Get an encoder for converting strings to bytes CharsetEncoder encoder = Charset.forName("US-ASCII").newEncoder(); for (;;) { // Loop forever, processing client connections // Wait for a client to connect SocketChannel client = server.accept(); // Build response string, wrap, and encode to bytes String date = new java.util.Date().toString() + "\r\n"; ByteBuffer response = encoder.encode(CharBuffer.wrap(date)); // Send the response to the client and disconnect. client.write(response);/*from w w w .ja v a 2 s . co m*/ client.close(); } }
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();/* w w w. j a v a2 s. c om*/ // 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:Main.java
public static void main(String[] args) throws Exception { InetAddress serverIPAddress = InetAddress.getByName("localhost"); int port = 19000; InetSocketAddress serverAddress = new InetSocketAddress(serverIPAddress, port); Selector selector = Selector.open(); SocketChannel channel = SocketChannel.open(); channel.configureBlocking(false);//from w w w. j av a 2 s. com channel.connect(serverAddress); int operations = SelectionKey.OP_CONNECT | SelectionKey.OP_READ | SelectionKey.OP_WRITE; channel.register(selector, operations); userInputReader = new BufferedReader(new InputStreamReader(System.in)); while (true) { if (selector.select() > 0) { boolean doneStatus = processReadySet(selector.selectedKeys()); if (doneStatus) { break; } } } channel.close(); }
From source file:MainClass.java
public static void main(String[] args) throws IOException { Charset charset = Charset.forName("ISO-8859-1"); CharsetEncoder encoder = charset.newEncoder(); CharsetDecoder decoder = charset.newDecoder(); ByteBuffer buffer = ByteBuffer.allocate(512); Selector selector = Selector.open(); ServerSocketChannel server = ServerSocketChannel.open(); server.socket().bind(new java.net.InetSocketAddress(8000)); server.configureBlocking(false);/* w w w .j ava2 s . c o m*/ SelectionKey serverkey = server.register(selector, SelectionKey.OP_ACCEPT); for (;;) { selector.select(); Set keys = selector.selectedKeys(); for (Iterator i = keys.iterator(); i.hasNext();) { SelectionKey key = (SelectionKey) i.next(); i.remove(); if (key == serverkey) { if (key.isAcceptable()) { SocketChannel client = server.accept(); client.configureBlocking(false); SelectionKey clientkey = client.register(selector, SelectionKey.OP_READ); clientkey.attach(new Integer(0)); } } else { SocketChannel client = (SocketChannel) key.channel(); if (!key.isReadable()) continue; int bytesread = client.read(buffer); if (bytesread == -1) { key.cancel(); client.close(); continue; } buffer.flip(); String request = decoder.decode(buffer).toString(); buffer.clear(); if (request.trim().equals("quit")) { client.write(encoder.encode(CharBuffer.wrap("Bye."))); key.cancel(); client.close(); } else { int num = ((Integer) key.attachment()).intValue(); String response = num + ": " + request.toUpperCase(); client.write(encoder.encode(CharBuffer.wrap(response))); key.attach(new Integer(num + 1)); } } } } }
From source file:MainClass.java
public static void main(String[] args) throws IOException { URL u = new URL("http://www.java2s.com"); String host = u.getHost();/*from w ww . ja va 2 s . c o m*/ int port = 80; String file = "/"; SocketAddress remote = new InetSocketAddress(host, port); SocketChannel channel = SocketChannel.open(remote); FileOutputStream out = new FileOutputStream("yourfile.htm"); FileChannel localFile = out.getChannel(); String request = "GET " + file + " HTTP/1.1\r\n" + "User-Agent: HTTPGrab\r\n" + "Accept: text/*\r\n" + "Connection: close\r\n" + "Host: " + host + "\r\n" + "\r\n"; ByteBuffer header = ByteBuffer.wrap(request.getBytes("US-ASCII")); channel.write(header); ByteBuffer buffer = ByteBuffer.allocate(8192); while (channel.read(buffer) != -1) { buffer.flip(); localFile.write(buffer); buffer.clear(); } localFile.close(); channel.close(); }