DatagramChannel使用

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DatagramChannel是nio中处理UDP的类,可以使用2种方式:

DatagramChannel.receive(ByteBuffer dst)和DatagramChannel.send(ByteBuffer src, SocketAddress target)

调用connect()之后,使用read和write.

方式一

send和receive示例

/** * @author cxg * */public class DatagramChannelSender {public static void main(String[] args) {try {send();} catch (IOException e) {e.printStackTrace();}}private static void send() throws IOException{DatagramChannel channel =DatagramChannel.open();ByteBuffer buffer =ByteBuffer.wrap("下雨的夜晚很安静".getBytes("utf-8"));channel.send(buffer, new InetSocketAddress("localhost",10022));channel.close();}}

/** * @author cxg * */public class DatagramChannelReveiver {public static void main(String[] args) {try {receive();} catch (IOException e) {e.printStackTrace();}}private static void receive() throws IOException{DatagramChannel channel =DatagramChannel.open();channel.socket().bind(new InetSocketAddress(10022));ByteBuffer buffer =ByteBuffer.allocate(60);while(channel.receive(buffer)==null){ try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}}buffer.flip();String recStr =Charset.forName("utf-8").newDecoder().decode(buffer).toString();System.out.println(recStr);channel.close();}}

方式2

connect()说明

1.只起到,限制数据包的接收和发送来源

2.不会阻塞

3.使用read和write的必要条件,否则抛出"NotYetConnectedException "

其他注意

DatagramChannel不能注册SelectionKey.OP_CONNECT

数据包的最大容量是65507字节

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