問題：當某個客戶端退出后，其他客戶端再發消息的時候，轉發就會報錯；

package com.huaxin.server;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;

public class Myserver {
	
	public static ArrayList<ServerThread>list =new ArrayList<ServerThread>();
	
	public  void initServer() {
		
		try {
			//創建服務器對象,并指定端口號
			ServerSocket server = new ServerSocket(9090);
			System.out.println("服務器已建立......");
			//不斷獲得客戶真個連接
			while(true){
				Socket socket =server.accept();
				System.out.println("客戶端連接進來了......");
				//當有客戶端連接進來以后，開啟1個線程，用來處理該客戶真個邏輯,
				ServerThread st = new ServerThread(socket);
				st.start();
				//添加該客戶端到容器中
				list.add(st);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}

package com.huaxin.server;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class ServerThread extends Thread {

	public Socket socket;
	public InputStream ins;
	public OutputStream ous;

	public ServerThread(Socket socket) {
		this.socket = socket;
	}

	public void run() {
		try {
			// 獲得輸入輸出流
			ins = socket.getInputStream();
			ous = socket.getOutputStream();
			// 發送消息給客戶端
			String msg = "welcome to zhou's server !";
			sendMsg(ous, msg);
			// 發送要求登錄信息給客戶端
			String userinfo = "please input your name:";
			sendMsg(ous, userinfo);
			// 獲得客戶端輸入的用戶名
			String userName = readMsg(ins);
			// 發送要求密碼信息給客戶端
			String pwd = "please input your password:";
			sendMsg(ous,  pwd);
			// 獲得客戶端輸入的密碼
			String pass = readMsg(ins);
			// 登錄驗證
			boolean falg = loginCheck(userName, pass);
			// 校驗不通過時，循環校驗
			while (!falg) {
				msg = "Fail to connect server......";
				sendMsg(ous, msg);
				msg = "please check your name and password and login again.....";
				sendMsg(ous, msg);
				msg = "please input your name:";
				sendMsg(ous, msg);
				// 獲得客戶端輸入的用戶名
				userName = readMsg(ins);
				// 發送要求密碼信息給客戶端
				msg = "please input your password:";
				sendMsg(ous, msg);
				// 獲得客戶端輸入的密碼
				pass = readMsg(ins);
				falg = loginCheck(userName, pass);
			}

			// 校驗成功后：開始聊天
			msg = "successful connected..... you can chat with your friends now ......";
			sendMsg(ous, msg);
			// 聊天處理邏輯
			//讀取客戶端發來的消息
			msg=readMsg(ins);
			//輸入bye結束聊天
			while(!"bye".equals(msg)){
				//給容器中的每一個對象轉發消息
				for (int i = 0; i <Myserver.list.size(); i++) {
					ServerThread st =Myserver.list.get(i);
					//不該自己轉發消息
					if(st!=this){
						sendMsg(st.ous, userName+"  is say:"+msg);
					}
				}
				//等待讀取下1次的消息
				msg=readMsg(ins);
			}

		} catch (Exception e) {
			System.out.println("客戶端不正常關閉......");
//			e.printStackTrace();
		}
		//有異常后統1將流關閉
		try {
			ins.close();
			ous.close();
			socket.close();
			//將當前已關閉的客戶端從容器中移除
			Myserver.list.remove(this);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	// 校驗客戶端輸入的賬號和密碼的函數,由于沒有數據庫，暫時寫死了
	public boolean loginCheck(String name, String pwd) {
		if (name.equals("zhou") && pwd.equals("zhou") || name.equals("user") && pwd.equals("pwd")
				|| name.equals("huaxinjiaoyu") && pwd.equals("huaxinjiaoyu")) {

			return true;
		}
		return false;
	}

	// 發送消息的函數
	public void sendMsg(OutputStream os, String s) throws IOException {
		// 向客戶端輸出信息
		byte[] bytes = s.getBytes();
		os.write(bytes);
		os.write(13);
		os.write(10);
		os.flush();

	}

	// 讀取客戶端輸入數據的函數
	public String readMsg(InputStream ins) throws Exception {
		// 讀取客戶真個信息
		int value = ins.read();
		// 讀取整行 讀取到回車（13）換行（10）時停止讀
		String str = "";
		while (value != 10) {
			// 點擊關閉客戶端時會返回⑴值
			if (value == ⑴) {
				throw new Exception();
			}
			str = str + ((char) value);
			value = ins.read();
		}
		str = str.trim();
		return str;
	}

}

package com.huaxin.server;

public class Test {
	
	public static void main(String[] args) {
		Myserver ms = new Myserver();
		ms.initServer();
	}

}