DatagramPacket传递对象老是提示以下问题,帮忙告诉我为什么?writeObject()的内容我已经序列化过了.

Question

java.io.NotSerializableException: NetClient
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at TankNewMsg.sendObject(TankNewMsg.java:128)
at NetClient.sendObject(NetClient.java:95)
at NetClient.connect(NetClient.java:82)
at TankClient$ConnDialog$2.actionPerformed(TankClient.java:217)
at java.awt.Button.processActionEvent(Unknown Source)
at java.awt.Button.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at java.awt.Window.setVisible(Unknown Source)
at java.awt.Dialog.setVisible(Unknown Source)
at TankClient$KeyMonitor.keyPressed(TankClient.java:167)
at java.awt.Component.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Window.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

把调用的代码和Tank类的代码都贴出来,这个是基础问题，不难处理，我帮你解决。

Answer 2

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.io.Serializable;
//import java.util.Random;/**
 * 代表坦克的类
 * @author mashibing
 *
 */
public class Tank implements Serializable{
private static final long serialVersionUID = 1L; 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;

/**
 * 根据位置和好坏构建坦克
 * @param x
 * @param y
 * @param good
 */
public Tank(int x, int y, boolean good) {
this.x = x;
this.y = y;
this.good = good;
}

/**
 * 根据相关属性构建坦克
 * @param x
 * @param y
 * @param good
 * @param dir
 * @param tc 游戏的场所
 */
public Tank(int x, int y, boolean good, Dir dir, TankClient tc) {
this(x, y, good);
this.dir = dir;
this.tc = tc;
}

/**
 * 画出坦克
 * @param g 画笔
 */
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(); }
 */ }

/**
 * 键按下的消息处理
 * @param e 按键事件
 */
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);
}*/
}

/**
 * 键抬起的消息处理
 * @param e 抬键消息
 */
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;
}

/**
 * 取得坦克的外切方形
 * @return 坦克的外切Rectangle
 */
public Rectangle getRect() {
return new Rectangle(x, y, WIDTH, HEIGHT);
}

/**
 * 检测坦克是否还活着
 * @return
 */
public boolean isLive() {
return live;
}

/**
 * 设定坦克的生死状态
 * @param live
 */
public void setLive(boolean live) {
this.live = live;
}
}谢谢你,这个问题还是我发的.

Answer 3

你先自己检查下TankClient  和 Dir 类序列化没有，如果不需要序列化，你可以设置为transient，