Examples of java.net.DatagramSocket.connect()

java.net.DatagramSocket.connect()
Connects the socket to a remote address for this socket. When a socket is connected to a remote address, packets may only be sent to or received from that address. By default a datagram socket is not connected.
If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown.
A caller's permission to send and receive datagrams to a given host and port are checked at connect time. When a socket is connected, receive and send will not perform any security checks on incoming and outgoing packets, other than matching the packet's and the socket's address and port. On a send operation, if the packet's address is set and the packet's address and the socket's address do not match, an IllegalArgumentException will be thrown. A socket connected to a multicast address may only be used to send packets. @param address the remote address for the socket @param port the remote port for the socket. @exception IllegalArgumentException if the address is null,or the port is out of range. @exception SecurityException if the caller is not allowed tosend datagrams to and receive datagrams from the address and port. @see #disconnect @see #send @see #receive

        int[] ports = Support_PortManager.getNextPortsForUDP(3);
        int sport = ports[0];
        int portNumber = ports[1];
        DatagramSocket s = new DatagramSocket(new InetSocketAddress(InetAddress
                .getLocalHost(), portNumber));
        s.connect(new InetSocketAddress(InetAddress.getLocalHost(), sport));
        assertTrue("Returned incorrect InetSocketAddress(1):"
                + s.getLocalSocketAddress().toString(),
                s.getRemoteSocketAddress()
                        .equals(
                                new InetSocketAddress(InetAddress

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                portNumber));
        assertNull("Returned incorrect InetSocketAddress -unconnected socket:"
                + "Expected: NULL", theSocket.getRemoteSocketAddress());


        // now connect and validate we get the right answer
        theSocket.connect(new InetSocketAddress(InetAddress.getLocalHost(),
                sport));
        assertTrue("Returned incorrect InetSocketAddress(2):"
                + theSocket.getRemoteSocketAddress().toString(),
                theSocket.getRemoteSocketAddress()
                        .equals(

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            byte theBytes[] = { -1, -1, -1, -1 };


            // validate we cannot connect to the broadcast address when
            // setBroadcast is false
            try {
                theSocket.connect(new InetSocketAddress(InetAddress
                        .getByAddress(theBytes), ports[1]));
                assertFalse(
                        "No exception when connecting to broadcast address with setBroadcast(false)",
                        theSocket.getBroadcast());
            } catch (Exception ex) {

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            }


            // now validate that we can connect to the broadcast address when
            // setBroadcast is true
            theSocket.setBroadcast(true);
            theSocket.connect(new InetSocketAddress(InetAddress
                    .getByAddress(theBytes), ports[2]));
            ensureExceptionThrownIfOptionIsUnsupportedOnOS(SO_BROADCAST);
        } catch (Exception e) {
            handleException(e, SO_BROADCAST);
        }

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     * @tests java.net.DatagramSocket#connect(java.net.InetAddress, int)
     */
    public void test_connectLjava_net_InetAddressI() throws Exception {
        DatagramSocket ds = new DatagramSocket();
        InetAddress inetAddress = InetAddress.getLocalHost();
        ds.connect(inetAddress, 0);
        assertEquals("Incorrect InetAddress", inetAddress, ds.getInetAddress());
        assertEquals("Incorrect Port", 0, ds.getPort());
        ds.disconnect();


        int portNumber;

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            ds = new java.net.DatagramSocket();
            inetAddress = InetAddress
                    .getByName(Support_Configuration.IPv6GlobalAddressJcl4);
            portNumber = Support_PortManager.getNextPortForUDP();
            ds.connect(inetAddress, portNumber);
            assertTrue("Incorrect InetAddress", ds.getInetAddress().equals(
                    inetAddress));
            assertTrue("Incorrect Port", ds.getPort() == portNumber);
            ds.disconnect();
        }

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        // Create a connected datagram socket to test
        // PlainDatagramSocketImpl.peek()
        InetAddress localHost = InetAddress.getLocalHost();
        ds = new DatagramSocket();
        int port = ds.getLocalPort();
        ds.connect(localHost, port);
        DatagramPacket send = new DatagramPacket(new byte[10], 10, localHost,
                port);
        ds.send(send);
        DatagramPacket receive = new DatagramPacket(new byte[20], 20);
        ds.setSoTimeout(2000);

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        // send a dgram to a server that is not running and then do a recv
        try {
            ds = new java.net.DatagramSocket();
            inetAddress = InetAddress.getLocalHost();
            portNumber = Support_PortManager.getNextPortForUDP();
            ds.connect(inetAddress, portNumber);
            send = new DatagramPacket(new byte[10], 10);
            ds.send(send);
            receive = new DatagramPacket(new byte[20], 20);
            ds.setSoTimeout(10000);
            ds.receive(receive);

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     * @tests java.net.DatagramSocket#disconnect()
     */
    public void test_disconnect() throws Exception {
        DatagramSocket ds = new DatagramSocket();
        InetAddress inetAddress = InetAddress.getLocalHost();
        ds.connect(inetAddress, 0);
        ds.disconnect();
        assertNull("Incorrect InetAddress", ds.getInetAddress());
        assertEquals("Incorrect Port", -1, ds.getPort());


        if ("true".equals(System.getProperty("run.ipv6tests"))) {

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                    .println("Running test_disconnect(DatagramSocketTest) with IPv6GlobalAddressJcl4: "
                            + Support_Configuration.IPv6GlobalAddressJcl4);
            ds = new DatagramSocket();
            inetAddress = InetAddress
                    .getByName(Support_Configuration.IPv6GlobalAddressJcl4);
            ds.connect(inetAddress, 0);
            ds.disconnect();
            assertNull("Incorrect InetAddress", ds.getInetAddress());
            assertEquals("Incorrect Port", -1, ds.getPort());
        }
    }

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