NIO部分:DatagramSocket实例

////////////////////////////Demo
package com.test.java;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;

public class DatagramTestMain {
	private static final int port = 30006;

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		Thread server = new ServerThread();
		server.start();
		Thread client = new ClientThread();
		client.start();
		Thread.sleep(3000);
	}

	static class ServerThread extends Thread {
		@Override
		public void run() {
			try {
				DatagramSocket socket = new DatagramSocket(null);// null is
				InetSocketAddress address = new InetSocketAddress(port);//server端bind到本地端口
				socket.bind(address);
				//read
				DatagramPacket rp = new DatagramPacket(new byte[1024], 1024);
				socket.receive(rp);
				//right style
				//byte[] data = Arrays.copyOfRange(rp.getData(),rp.getOffset(), rp.getLength());
				System.out.println("server Receive :" + new String(rp.getData()));
				//reply
				InetAddress from = rp.getAddress();
				rp.setAddress(from);
				String message = "--server--" + System.currentTimeMillis();
				rp.setData(message.getBytes());
				socket.send(rp);
				socket.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	static class ClientThread extends Thread {
		@Override
		public void run() {
			try {
				//send
				DatagramSocket socket = new DatagramSocket();
				InetSocketAddress address = new InetSocketAddress(
						InetAddress.getLocalHost(), port);
				DatagramPacket sp = new DatagramPacket(new byte[1024], 1024);
				String data = "--client--" + System.currentTimeMillis();
				sp.setData(data.getBytes());
				sp.setSocketAddress(address);
				socket.send(sp);
				//block for receiving.
				socket.receive(sp);
				System.out.println("client receive:" + new String(sp.getData()));
				socket.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

 

 

/////////////////////////DatagramChannel:
public class DatagramChannelTestMain {
	private static final int port = 30006;

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		Thread server = new ServerThread();
		server.start();
		Thread client = new ClientThread();
		client.start();
		Thread.sleep(3000);
	}

	static class ServerThread extends Thread {
		@Override
		public void run() {
			try {
				Selector selector = Selector.open();
				InetSocketAddress address = new InetSocketAddress(port);
				// /socket.setSoTimeout(10000);//10ms
				DatagramChannel channel = DatagramChannel.open();
				channel.configureBlocking(false);
				channel.socket().bind(address);// null is
				//channel.register(selector, SelectionKey.OP_READ);//DatagramChannel无需注册selector.
				ByteBuffer buffer = ByteBuffer.allocate(1024);
				while (true) {
					InetSocketAddress from = (InetSocketAddress)channel.receive(buffer);
					if(from == null){//如果from为null,则表示没有收到数据
						Thread.sleep(1000);
						continue;
					}
					buffer.flip();
					System.out.println("///////////////////Receive");
					System.out.println("data : " + new String(buffer.array()));
					System.out.println("time : " + System.currentTimeMillis());
					System.out.println("from : "
							+ from.getHostName());
					buffer.clear();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	static class ClientThread extends Thread {
		@Override
		public void run() {
			try {
				InetSocketAddress address = new InetSocketAddress(
						InetAddress.getLocalHost(), port);
				Selector selector = Selector.open();
				DatagramChannel channel = DatagramChannel.open();
				channel.configureBlocking(false);
				//channel.socket().connect(address);
				int count = 0;
				ByteBuffer buffer = ByteBuffer.allocate(1024);
				while (count < 100) {
					String data = "Send Time : " + System.currentTimeMillis();
					buffer.put(data.getBytes());
					buffer.flip();
					channel.send(buffer, address);//通过send指定address
					System.out.println("///////////////////Send");
					System.out.println(data);
					Thread.sleep(2000);
					buffer.clear();
					count ++;
				}
				channel.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}