坦克大战网络版

不足之处

Server不够高效....需要看更多书去学习
协议不够精细
TankNewMsg TankAreadyExistMsg
子弹打中坦克后可否只发送一个消息
tankId id 被打中的tankId
同步线程
坦克退出后的服务器端处理.....另起端口管理跟命令相关之处，命令与数据分开
一段时间没有接收到数据后的处理
更加精细的内存控制

TankServer

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.List;

public class TankServer {
	private static int ID = 100;
	public static final int TCP_PORT = 8888;
	public static final int UDP_PORT = 6666;
	
	List<Client> clients = new ArrayList<Client>();
	
	
	
	public void start() {
		
		new Thread(new UDPThread()).start();
		
		ServerSocket ss = null;
		try {
			ss = new ServerSocket(TCP_PORT);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		while(true) {
			Socket s = null;
			try {
				s = ss.accept();
				DataInputStream dis = new DataInputStream(s.getInputStream());
				String IP = s.getInetAddress().getHostAddress();
				int udpPort = dis.readInt();
				Client c = new Client(IP, udpPort);
				clients.add(c);
				DataOutputStream dos = new DataOutputStream(s.getOutputStream());
				dos.writeInt(ID++);
				//s.close();
System.out.println("A Client Connect! Addr- " + s.getInetAddress() + ":" + s.getPort() + "----UDP Port:" + udpPort);
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				if(s != null) {
					try {
						s.close();
						s = null;
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}
	
	public static void main(String[] args) {
		new TankServer().start();
	}
	
	private class Client {
		String IP;
		int udpPort;
		
		public Client(String IP, int udpPort) {
			this.IP = IP;
			this.udpPort = udpPort;
		}
	}
	
	private class UDPThread implements Runnable {
		
		byte[] buf = new byte[1024];
		
		public void run() {
			DatagramSocket ds = null;
			try {
				ds = new DatagramSocket(UDP_PORT);
			} catch (SocketException e) {
				e.printStackTrace();
			}
System.out.println("UDP thread started at port :" + UDP_PORT);
			while(ds != null){
				DatagramPacket dp = new DatagramPacket(buf, buf.length);
				try {
					ds.receive(dp);
					for(int i=0; i<clients.size(); i++) {
						Client c = clients.get(i);
						dp.setSocketAddress(new InetSocketAddress(c.IP, c.udpPort));
						ds.send(dp);
					}
System.out.println("a packet received!");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		
	}
}

TankClient

import java.awt.Button;
import java.awt.Color;
import java.awt.Dialog;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;

public class TankClient extends Frame {
	public static final int GAME_WIDTH = 800;
	public static final int GAME_HEIGHT = 600;
	
	Tank myTank = new Tank(50, 50, true, Dir.STOP, this);
	
	List<Missile> missiles = new ArrayList<Missile>();
	List<Explode> explodes = new ArrayList<Explode>();
	List<Tank> tanks = new ArrayList<Tank>();

	Image offScreenImage = null;
	
	NetClient nc = new NetClient(this);
	
	ConnDialog dialog = new ConnDialog(); 
	
	@Override
	public void paint(Graphics g) {
		g.drawString("missiles count:" + missiles.size(), 10, 50);
		g.drawString("explodes count:" + explodes.size(), 10, 70);
		g.drawString("tanks    count:" + tanks.size(), 10, 90);
		
		for(int i=0; i<missiles.size(); i++) {
			Missile m = missiles.get(i);
			//m.hitTanks(tanks);
			if(m.hitTank(myTank)) {
				TankDeadMsg msg = new TankDeadMsg(myTank.id);
				nc.send(msg);
				MissileDeadMsg mdmMsg = new MissileDeadMsg(m.tankId, m.id);
				nc.send(mdmMsg);
			}
			m.draw(g);
		}
		
		for(int i=0; i<explodes.size(); i++) {
			Explode e = explodes.get(i);
			e.draw(g);
		}
	
		for(int i=0; i<tanks.size(); i++) {
			Tank t = tanks.get(i);
			t.draw(g);
		}
		
		myTank.draw(g);
		
	
	}

	@Override
	public void update(Graphics g) {
		if(offScreenImage == null) {
			offScreenImage = this.createImage(800, 600);
		}
		Graphics gOffScreen = offScreenImage.getGraphics();
		Color c = gOffScreen.getColor();
		gOffScreen.setColor(Color.GREEN);
		gOffScreen.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
		gOffScreen.setColor(c);
		paint(gOffScreen);
		g.drawImage(offScreenImage, 0, 0, null);
	}
	
	public void launchFrame() {
		
		this.setLocation(400, 300);
		this.setSize(GAME_WIDTH, GAME_HEIGHT);
		this.setTitle("TankWar");
		this.addWindowListener(new WindowAdapter() {

			@Override
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
			
		});
		this.setResizable(false);
		this.setBackground(Color.GREEN);
		
		this.addKeyListener(new KeyMonitor());
		
		this.setVisible(true);
		
		new Thread(new PaintThread()).start();
		
		//nc.connect("127.0.0.1", TankServer.TCP_PORT);
	}
	
	public static void main(String[] args) {
		TankClient tc = new TankClient();
		tc.launchFrame();
	}
	
	class PaintThread implements Runnable {

		public void run() {
			while(true) {
				repaint();
				try {
					Thread.sleep(50);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
		
	}
	
	class KeyMonitor extends KeyAdapter {

		@Override
		public void keyReleased(KeyEvent e) {
			myTank.keyReleased(e);
		}

		@Override
		public void keyPressed(KeyEvent e) {
			int key = e.getKeyCode(); 
			if(key == KeyEvent.VK_C) {
				dialog.setVisible(true);
			} else {
				myTank.keyPressed(e);
			}
		}
		
	}
	
	class ConnDialog extends Dialog {
		Button b = new Button("确定");
		TextField tfIP = new TextField("127.0.0.1", 12);
		TextField tfPort = new TextField("" + TankServer.TCP_PORT, 4);
		TextField tfMyUDPPort = new TextField("2223", 4);
		public ConnDialog() {
			super(TankClient.this, true);
		
			this.setLayout(new FlowLayout());
			this.add(new Label("IP:"));
			this.add(tfIP);
			this.add(new Label("Port:"));
			this.add(tfPort);
			this.add(new Label("My UDP Port:"));
			this.add(tfMyUDPPort);
			this.add(b);
			this.setLocation(300, 300);
			this.pack();
			this.addWindowListener(new WindowAdapter() {
				@Override
				public void windowClosing(WindowEvent e) {
					setVisible(false);
				}
			});
			b.addActionListener(new ActionListener() {

				public void actionPerformed(ActionEvent e) {
					String IP = tfIP.getText().trim();
					int port = Integer.parseInt(tfPort.getText().trim());
					int myUDPPort = Integer.parseInt(tfMyUDPPort.getText().trim());
					nc.setUdpPort(myUDPPort);
					nc.connect(IP, port);
					setVisible(false);
				}
				
			});
		}

	}
	
}

NetClient

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;

public class NetClient {
	TankClient tc;
	private int udpPort;
	
	String IP;  //server IP
	
	DatagramSocket ds = null;
	
	public NetClient(TankClient tc) {
		this.tc = tc;
		
	}

	public void connect(String IP, int port) {
		this.IP = IP; 
		try {
			ds = new DatagramSocket(udpPort);
		} catch (SocketException e) {
			e.printStackTrace();
		}
		
		Socket s = null;
		try {
			s = new Socket(IP, port);
			DataOutputStream dos = new DataOutputStream(s.getOutputStream());
			dos.writeInt(udpPort);
			DataInputStream dis = new DataInputStream(s.getInputStream());
			int id = dis.readInt();
			tc.myTank.id = id;
			
			if(id%2 == 0) tc.myTank.good = false;
			else tc.myTank.good = true;
			
System.out.println("Connected to server! and server give me a ID:" + id);
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if(s != null) {
				try {
					s.close();
					s = null;
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		
		TankNewMsg msg = new TankNewMsg(tc.myTank);
		send(msg);
		
		new Thread(new UDPRecvThread()).start();
	}
	
	public void send(Msg msg) {
		msg.send(ds, IP, TankServer.UDP_PORT);
	}
	
	private class UDPRecvThread implements Runnable {
		
		byte[] buf = new byte[1024];
		
		public void run() {
			
			while(ds != null){
				DatagramPacket dp = new DatagramPacket(buf, buf.length);
				try {
					ds.receive(dp);
					parse(dp);
System.out.println("a packet received from server!");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

		private void parse(DatagramPacket dp) {
			ByteArrayInputStream bais = new ByteArrayInputStream(buf, 0, dp.getLength());
			DataInputStream dis = new DataInputStream(bais);
			int msgType = 0;
			try {
				msgType = dis.readInt();
			} catch (IOException e) {
				e.printStackTrace();
			}
			Msg msg = null;
			switch (msgType) {
			case Msg.TANK_NEW_MSG:				
				msg = new TankNewMsg(NetClient.this.tc);
				msg.parse(dis);
				break;
			case Msg.TANK_MOVE_MSG:
				msg = new TankMoveMsg(NetClient.this.tc);
				msg.parse(dis);
				break;
			case Msg.MISSILE_NEW_MSG:
				msg = new MissileNewMsg(NetClient.this.tc);
				msg.parse(dis);
				break;
			case Msg.TANK_DEAD_MSG:
				msg = new TankDeadMsg(NetClient.this.tc);
				msg.parse(dis);
				break;
			case Msg.MISSILE_DEAD_MSG:
				msg = new MissileDeadMsg(NetClient.this.tc);
				msg.parse(dis);
				break;
			}
			
		}
		
	}

	public int getUdpPort() {
		return udpPort;
	}

	public void setUdpPort(int udpPort) {
		this.udpPort = udpPort;
	}
}

Msg接口

import java.io.DataInputStream;
import java.net.DatagramSocket;


public interface Msg {
	public static final int TANK_NEW_MSG = 1;
	public static final int TANK_MOVE_MSG = 2;
	public static final int MISSILE_NEW_MSG = 3;
	public static final int TANK_DEAD_MSG = 4;
	public static final int MISSILE_DEAD_MSG = 5;
	
	public void send(DatagramSocket ds, String IP, int udpPort);
	public void parse(DataInputStream dis);
}

TankNewMsg

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;


public class TankNewMsg implements Msg {
	int msgType = Msg.TANK_NEW_MSG;
	
	Tank tank;
	TankClient tc;
	public TankNewMsg(Tank tank) {
		this.tank = tank;
	}
	
	public TankNewMsg(TankClient tc) {
		this.tc = tc;
	}
	
	public void send(DatagramSocket ds, String IP, int udpPort) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		try {
			dos.writeInt(msgType);
			dos.writeInt(tank.id);
			dos.writeInt(tank.x);
			dos.writeInt(tank.y);
			dos.writeInt(tank.dir.ordinal());
			dos.writeBoolean(tank.good);
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buf = baos.toByteArray();
		try {
			DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress(IP, udpPort));
			ds.send(dp);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

	public void parse(DataInputStream dis) {
		try {
			int id = dis.readInt();
			if(tc.myTank.id == id) {
				return;
			}
			
			
			
			int x = dis.readInt();
			int y = dis.readInt();
			Dir dir = Dir.values()[dis.readInt()];
			boolean good = dis.readBoolean();
//System.out.println("id:" + id + "-x:" + x + "-y:" + y + "-dir:" + dir + "-good:" + good);
			boolean exist = false;
			for(int i=0; i<tc.tanks.size(); i++) {
				Tank t = tc.tanks.get(i);
				if(t.id == id) {
					exist = true;
					break;
				}
			}
			
			if(!exist) {
				TankNewMsg tnMsg = new TankNewMsg(tc.myTank);
				tc.nc.send(tnMsg);
				
				Tank t = new Tank(x, y, good, dir, tc);
				t.id = id;
				tc.tanks.add(t);
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		
	}
	
}

TankMoveMsg

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;


public class TankMoveMsg implements Msg {
	int msgType = Msg.TANK_MOVE_MSG;
	int x, y;
	int id;
	Dir ptDir;
	Dir dir;
	TankClient tc;
	
	public TankMoveMsg(int id,int x, int y,  Dir dir, Dir ptDir) {
		this.id = id;
		this.x = x;
		this.y = y;
		this.dir = dir;
		this.ptDir = ptDir;
	}
	
	public TankMoveMsg(TankClient tc) {
		this.tc = tc;
	}

	public void parse(DataInputStream dis) {
		try {
			int id = dis.readInt();
			if(tc.myTank.id == id) {
				return;
			}
			int x = dis.readInt();
			int y = dis.readInt();
			Dir dir = Dir.values()[dis.readInt()];
			Dir ptDir = Dir.values()[dis.readInt()];
			
//System.out.println("id:" + id + "-x:" + x + "-y:" + y + "-dir:" + dir + "-good:" + good);
			boolean exist = false;
			for(int i=0; i<tc.tanks.size(); i++) {
				Tank t = tc.tanks.get(i);
				if(t.id == id) {
					t.x = x;
					t.y = y;
					t.dir = dir;
					t.ptDir = ptDir;
					exist = true;
					break;
				}
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

	public void send(DatagramSocket ds, String IP, int udpPort) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		try {
			dos.writeInt(msgType);
			dos.writeInt(id);
			dos.writeInt(x);
			dos.writeInt(y);
			dos.writeInt(dir.ordinal());
			dos.writeInt(ptDir.ordinal());
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buf = baos.toByteArray();
		try {
			DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress(IP, udpPort));
			ds.send(dp);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	
}

TankDeadMsg

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;


public class TankDeadMsg implements Msg {
	int msgType = Msg.TANK_DEAD_MSG;
	TankClient tc;
	int id;
	
	public TankDeadMsg(int id) {
		this.id = id;
	}
	
	public TankDeadMsg(TankClient tc) {
		this.tc = tc;
	}
	
	public void parse(DataInputStream dis) {
		try {
			int id = dis.readInt();
			if(tc.myTank.id == id) {
				return;
			}
			
//System.out.println("id:" + id + "-x:" + x + "-y:" + y + "-dir:" + dir + "-good:" + good);
			for(int i=0; i<tc.tanks.size(); i++) {
				Tank t = tc.tanks.get(i);
				if(t.id == id) {
					t.setLive(false);
					break;
				}
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public void send(DatagramSocket ds, String IP, int udpPort) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		try {
			dos.writeInt(msgType);
			dos.writeInt(id);
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buf = baos.toByteArray();
		try {
			DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress(IP, udpPort));
			ds.send(dp);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}

Tank

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.util.Random;

public class Tank {
	int id;
	
	public static final int XSPEED = 5;
	public static final int YSPEED = 5;
	
	public static final int WIDTH = 30;
	public static final int HEIGHT = 30;
	
	boolean good;
	int x, y;
	
	private static Random r = new Random();
	
	private boolean live = true;
	
	private int step = r.nextInt(12) + 3;
	
	TankClient tc;
	
	boolean bL, bU, bR, bD;
		
	Dir dir = Dir.STOP;
	Dir ptDir = Dir.D;
	
	public Tank(int x, int y, boolean good) {
		this.x = x;
		this.y = y;
		this.good = good;
	}
	
	public Tank(int x, int y, boolean good, Dir dir, TankClient tc) {
		this(x, y, good);
		this.dir = dir;
		this.tc = tc;
	}
	
	public void draw(Graphics g) {
		if(!live) {
			if(!good) {
				tc.tanks.remove(this);
			}
			return;
		}
		
		Color c = g.getColor();
		if(good) g.setColor(Color.RED);
		else g.setColor(Color.BLUE);
		g.fillOval(x, y, WIDTH, HEIGHT);
		g.drawString("id:" + id, x, y-10);
		g.setColor(c);
		
		switch(ptDir) {
		case L:	
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x, y + HEIGHT/2);
			break;
		case LU:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x, y);
			break;
		case U:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x + WIDTH/2, y);
			break;
		case RU:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x + WIDTH, y);
			break;
		case R:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x + WIDTH, y + HEIGHT/2);
			break;
		case RD:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x + WIDTH, y + HEIGHT);
			break;
		case D:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x + WIDTH/2, y + HEIGHT);
			break;
		case LD:
			g.drawLine(x + WIDTH/2, y + HEIGHT/2, x, y + HEIGHT);
			break;
		}
		
		move();
	}

	private void move() {
		switch(dir) {
		case L:
			x -= XSPEED;
			break;
		case LU:
			x -= XSPEED;
			y -= YSPEED;
			break;
		case U:
			y -= YSPEED;
			break;
		case RU:
			x += XSPEED;
			y -= YSPEED;
			break;
		case R:
			x += XSPEED;
			break;
		case RD:
			x += XSPEED;
			y += YSPEED;
			break;
		case D:
			y += YSPEED;
			break;
		case LD:
			x -= XSPEED;
			y += YSPEED;
			break;
		case STOP:
			break;
		}
		
		if(dir != Dir.STOP) {
			ptDir = dir;
		}
		
		if(x < 0) x = 0;
		if(y < 30) y = 30;
		if(x + WIDTH > TankClient.GAME_WIDTH) x = TankClient.GAME_WIDTH - WIDTH;
		if(y + HEIGHT > TankClient.GAME_HEIGHT) y = TankClient.GAME_HEIGHT - HEIGHT;
		
		/*if(!good) {
			if(step == 0) {
				step = r.nextInt(12) + 3;
				Dir[] dirs = Dir.values();
				dir = dirs[r.nextInt(dirs.length)];
			}
			step --;
			if(r.nextInt(40) > 38) this.fire();
		}*/
		
	}

	public void keyPressed(KeyEvent e) {
		int key = e.getKeyCode();
		switch (key) {
		case KeyEvent.VK_LEFT:
			bL = true;
			break;
		case KeyEvent.VK_UP:
			bU = true;
			break;
		case KeyEvent.VK_RIGHT:
			bR = true;
			break;
		case KeyEvent.VK_DOWN:
			bD = true;
			break;
		}
		locateDirection();
	}

	private void locateDirection() {
		Dir oldDir = this.dir;
		
		if(bL && !bU && !bR && !bD) dir = Dir.L;
		else if(bL && bU && !bR && !bD) dir = Dir.LU;
		else if(!bL && bU && !bR && !bD) dir = Dir.U;
		else if(!bL && bU && bR && !bD) dir = Dir.RU;
		else if(!bL && !bU && bR && !bD) dir = Dir.R;
		else if(!bL && !bU && bR && bD) dir = Dir.RD;
		else if(!bL && !bU && !bR && bD) dir = Dir.D;
		else if(bL && !bU && !bR && bD) dir = Dir.LD;
		else if(!bL && !bU && !bR && !bD) dir = Dir.STOP;
		
		if(dir != oldDir) {
			TankMoveMsg msg = new TankMoveMsg(id, x, y, dir, ptDir);
			tc.nc.send(msg);
		}
	}

	public void keyReleased(KeyEvent e) {
		int key = e.getKeyCode();
		switch (key) {
		case KeyEvent.VK_CONTROL:
			fire();
			break;
		case KeyEvent.VK_LEFT:
			bL = false;
			break;
		case KeyEvent.VK_UP:
			bU = false;
			break;
		case KeyEvent.VK_RIGHT:
			bR = false;
			break;
		case KeyEvent.VK_DOWN:
			bD = false;
			break;
		}
		locateDirection();
	}
	
	private Missile fire() {
		if(!live)
			return null;
		int x = this.x + WIDTH/2 - Missile.WIDTH/2;
		int y = this.y + HEIGHT/2 - Missile.HEIGHT/2;
		Missile m = new Missile(id, x, y, this.good, this.ptDir, this.tc);
		tc.missiles.add(m);
		
		MissileNewMsg msg = new MissileNewMsg(m);
		tc.nc.send(msg);
		
		return m;
	}
	
	public Rectangle getRect() {
		return new Rectangle(x, y, WIDTH, HEIGHT);
	}

	public boolean isLive() {
		return live;
	}

	public void setLive(boolean live) {
		this.live = live;
	}
}

Missile

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.List;



public class Missile {
	public static final int XSPEED = 10;
	public static final int YSPEED = 10;
	
	public static final int WIDTH = 10;
	public static final int HEIGHT = 10;
	
	private static int ID = 1;
	
	TankClient tc;
	int tankId;
	int id;
	
	int x, y;
	Dir dir = Dir.R;
	boolean live = true;
	boolean good;
	
	public Missile(int tankId, int x, int y, boolean good, Dir dir) {
		this.tankId = tankId;
		this.x = x;
		this.y = y;
		this.good = good;
		this.dir = dir;
		this.id = ID++;
	}
	
	public Missile(int tankId, int x, int y, boolean good, Dir dir, TankClient tc) {
		this(tankId, x, y, good, dir);
		this.tc = tc;
	}
	
	public void draw(Graphics g) {
		if(!live) {
			tc.missiles.remove(this);
			return;
		}
		
		Color c = g.getColor();
		g.setColor(Color.BLACK);
		g.fillOval(x, y, WIDTH, HEIGHT);
		g.setColor(c);
		
		move();
	}

	private void move() {
		switch(dir) {
		case L:
			x -= XSPEED;
			break;
		case LU:
			x -= XSPEED;
			y -= YSPEED;
			break;
		case U:
			y -= YSPEED;
			break;
		case RU:
			x += XSPEED;
			y -= YSPEED;
			break;
		case R:
			x += XSPEED;
			break;
		case RD:
			x += XSPEED;
			y += YSPEED;
			break;
		case D:
			y += YSPEED;
			break;
		case LD:
			x -= XSPEED;
			y += YSPEED;
			break;
		case STOP:
			break;
		}
		
		if(x < 0 || y < 0 || x > TankClient.GAME_WIDTH || y > TankClient.GAME_HEIGHT) {
			live = false;
		}
	}
	
	public Rectangle getRect() {
		return new Rectangle(x, y, WIDTH, HEIGHT);
	}
	
	public boolean hitTank(Tank t) {
		if(this.live && t.isLive() && this.good != t.good &&this.getRect().intersects(t.getRect())) {
			this.live = false;
			t.setLive(false);
			tc.explodes.add(new Explode(x, y, tc));
			return true;
		}
		return false;
	}
	
	public boolean hitTanks(List<Tank> tanks) {
		for(int i=0; i<tanks.size(); i++) {
			if(this.hitTank(tanks.get(i))) {
				return true;
			}
		}
		return false;
	}
}

MissileNewMsg

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;


public class MissileNewMsg implements Msg {
	int msgType = Msg.MISSILE_NEW_MSG;
	TankClient tc;
	Missile m;
	
	public MissileNewMsg(Missile m) {
		this.m = m;
	}
	
	public MissileNewMsg(TankClient tc) {
		this.tc = tc;
	}
	
	public void send(DatagramSocket ds, String IP, int udpPort) {
		
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		try {
			dos.writeInt(msgType);
			dos.writeInt(m.tankId);
			dos.writeInt(m.id);
			dos.writeInt(m.x);
			dos.writeInt(m.y);
			dos.writeInt(m.dir.ordinal());
			dos.writeBoolean(m.good);
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buf = baos.toByteArray();
		try {
			DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress(IP, udpPort));
			ds.send(dp);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public void parse(DataInputStream dis) {
		try {
			int tankId = dis.readInt(); 
			if(tankId == tc.myTank.id) {
				return;
			}
			int id = dis.readInt();
			int x = dis.readInt();
			int y = dis.readInt();
			Dir dir = Dir.values()[dis.readInt()];
			boolean good = dis.readBoolean();
			
//System.out.println("id:" + id + "-x:" + x + "-y:" + y + "-dir:" + dir + "-good:" + good);
			Missile m = new Missile(tankId, x, y, good, dir, tc);
			m.id = id;
			tc.missiles.add(m);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	
}

MissileDeadMsg

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;


public class MissileDeadMsg implements Msg {
	int msgType = Msg.MISSILE_DEAD_MSG;
	TankClient tc;
	int tankId;
	int id;
	
	public MissileDeadMsg(int tankId, int id) {
		this.tankId = tankId;
		this.id = id;
	}
	
	public MissileDeadMsg(TankClient tc) {
		this.tc = tc;
	}
	
	public void parse(DataInputStream dis) {
		try {
			int tankId = dis.readInt();
			int id = dis.readInt();
			
//System.out.println("id:" + id + "-x:" + x + "-y:" + y + "-dir:" + dir + "-good:" + good);
			for(int i=0; i<tc.missiles.size(); i++) {
				Missile m = tc.missiles.get(i);
				if(m.tankId == tankId && m.id == id) {
					m.live = false;
					tc.explodes.add(new Explode(m.x, m.y, tc));
				}
			}
			
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public void send(DatagramSocket ds, String IP, int udpPort) {
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		try {
			dos.writeInt(msgType);
			dos.writeInt(tankId);
			dos.writeInt(id);
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buf = baos.toByteArray();
		try {
			DatagramPacket dp = new DatagramPacket(buf, buf.length, new InetSocketAddress(IP, udpPort));
			ds.send(dp);
		} catch (SocketException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

}

Explode

import java.awt.Color;
import java.awt.Graphics;

public class Explode {
	int x, y;
	private int[] diameters = {4, 7, 12, 18, 26, 32, 49, 30, 14, 6};
	private boolean live = true;
	
	private TankClient tc;
	int step = 0;
	
	public Explode(int x, int y, TankClient tc) {
		this.x = x;
		this.y = y;
		this.tc = tc;
	}
	
	public void draw(Graphics g) {
		if(!live) {
			tc.explodes.remove(this);
			return;
		}
		
		Color c = g.getColor();
		g.setColor(Color.ORANGE);
		g.fillOval(x, y, diameters[step], diameters[step]);
		g.setColor(c);
		
		step ++;
		if(step == diameters.length) {
			live = false;			
		}
	}
}

Dir

public enum Dir {
	L, LU, U, RU, R, RD, D, LD, STOP
}