Examples of java.net.DatagramSocket.receive()

java.net.DatagramSocket.receive()
Receives a datagram packet from this socket. When this method returns, the DatagramPacket's buffer is filled with the data received. The datagram packet also contains the sender's IP address, and the port number on the sender's machine.
This method blocks until a datagram is received. The length field of the datagram packet object contains the length of the received message. If the message is longer than the packet's length, the message is truncated.
If there is a security manager, a packet cannot be received if the security manager's checkAccept method does not allow it. @param p the DatagramPacket into which to placethe incoming data. @exception IOException if an I/O error occurs. @exception SocketTimeoutException if setSoTimeout was previously calledand the timeout has expired. @exception PortUnreachableException may be thrown if the socket is connectedto a currently unreachable destination. Note, there is no guarantee that the exception will be thrown. @exception java.nio.channels.IllegalBlockingModeException if this socket has an associated channel, and the channel is in non-blocking mode. @see java.net.DatagramPacket @see java.net.DatagramSocket @revised 1.4 @spec JSR-51

            assertEquals(writeBuf.length, rp.getLength());
            assertEquals(writeBuf, readBuf);
        }


        try {
            client.receive(rp);
            fail("Unexpected incoming data.");
        } catch (SocketTimeoutException e) {
        }


        client.close();

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                try {
                    port = PortProvider.getNextPort();
                    datagramSocket = new DatagramSocket(port,
                            InetAddress.getLocalHost());
                    while (message == null || "".equals(message.trim())) {
                        datagramSocket.receive(datagramPacket);
                        byte[] receivedBytes = datagramPacket.getData();
                        int nbReceivedBytes = datagramPacket.getLength();
                        byte[] trimmedBytes = new byte[nbReceivedBytes];
                        System.arraycopy(receivedBytes, 0,
                                trimmedBytes, 0, nbReceivedBytes);

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        Thread.sleep(1000);


        byte[] buf = new byte[128];
        DatagramPacket receive = new DatagramPacket(buf, buf.length, address, PORT);
        LOG.debug("+++ Receiving data +++");
        socket.receive(receive);


        socket.close();


        return new String(receive.getData(), 0, receive.getLength());
    }

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        DatagramPacket send = new DatagramPacket(new byte[10], 10, localHost,
                port);
        ds.send(send);
        DatagramPacket receive = new DatagramPacket(new byte[20], 20);
        ds.setSoTimeout(2000);
        ds.receive(receive);
        ds.close();
        assertTrue("Wrong size: " + receive.getLength(),
                receive.getLength() == 10);
        assertTrue("Wrong receiver", receive.getAddress().equals(localHost));

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            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);
            ds.close();
            fail("No PortUnreachableException when connected at native level on recv ");
        } catch (PortUnreachableException e) {
            // Expected
        }

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            final DatagramSocket ds = new DatagramSocket();
            ds.setSoTimeout(12000);
            Runnable runnable = new Runnable() {
                public void run() {
                    try {
                        ds.receive(new DatagramPacket(new byte[1], 1));
                    } catch (InterruptedIOException e) {
                        interrupted = true;
                    } catch (IOException e) {
                    }
                }

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            final DatagramSocket ds2 = new DatagramSocket(ports[1]);
            ds2.setSoTimeout(12000);
            Runnable runnable2 = new Runnable() {
                public void run() {
                    try {
                        ds2.receive(new DatagramPacket(new byte[1], 1,
                                InetAddress.getLocalHost(), portNum));
                    } catch (InterruptedIOException e) {
                        interrupted = true;
                    } catch (IOException e) {
                    }

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            interrupted = false;
            DatagramSocket ds3 = new DatagramSocket();
            ds3.setSoTimeout(500);
            Date start = new Date();
            try {
                ds3.receive(new DatagramPacket(new byte[1], 1));
            } catch (InterruptedIOException e) {
                interrupted = true;
            }
            ds3.close();
            assertTrue("receive not interrupted", interrupted);

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        System.out.println("Waiting for possible shutdown message on port "+UDP_PORT);
        try {
            socket = new DatagramSocket(UDP_PORT);
            DatagramPacket request = new DatagramPacket(buf, buf.length);
            while(true) {
                socket.receive(request);
                InetAddress address = request.getAddress();
                // Only accept commands from the local host
                if (address.isLoopbackAddress()){
                    String command = new String(request.getData(), request.getOffset(), request.getLength(),"ASCII");
                    System.out.println("Command: "+command+" received from "+address);

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    {
      while (isStarted())
      {
        p.setData( buf.getBuf() );
        
        s.receive( p );
        
        buf.setIndex( 0 );
        buf.setLength( p.getLength() );
        
        if (s.isConnected())

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