JAVA 基于UDP的多客户端和一个服务器的问题，服务端不能转发消息

hsw0922 2018-06-28 08:55:28

import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketAddress;

import java.net.SocketException;

import java.util.ArrayList;

import java.util.List;



public class Server {

	private List<SocketAddress> all = new ArrayList<SocketAddress>();

	

	public static void main(String args) throws IOException {

		new Server().start();

	}

	

	public void start() {

		try {

			DatagramSocket server = new DatagramSocket(30003);

			while(true) {

				MyChannel channel = new MyChannel(server);

				new Thread(channel).start();

				

			}	

		} catch (SocketException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}

	

	private class MyChannel implements Runnable{

		private DatagramSocket server;

		private DatagramPacket packet;

		public MyChannel(DatagramSocket server) {

			this.server = server;

			try {

				byte container = new byte;

				packet =new DatagramPacket(container,container.length);

				server.receive(packet);

				SocketAddress address = packet.getSocketAddress();

				all.add(address);   //加入到容器

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		}

		

		private String receive() {

			String msg;

			msg = new String(packet.getData(),0,packet.getLength());

			return msg;

		}

		

		@Override

		public void run() {

			// TODO Auto-generated method stub

				System.out.println(receive());

				sendOthers(packet);

		}

		

		private void sendOthers(DatagramPacket dp) {

			//String msg = receive();

			//遍历容器

			for(SocketAddress sa:all) {

				try {

					String str = new String(dp.getData(),0,dp.getLength()); 

					DatagramPacket dd = new DatagramPacket(str.getBytes(),str.getBytes().length,sa);	

					server.send(dd);

				} catch (IOException e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

			}

				

		}

		

	}

}