java Socket编程 为什么起多个客户端之后就会卡死在那(源码如下)? 400 报错

服务器端明显存在问题吧？你看一下你那个发送线程######我属菜鸟一枚 不懂啊 请帮我改一下好不######

服务端每次接受的都是同一个对象，当然会有问题啦

	private static final long serialVersionUID = 1L;

	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd  HH:mm:ss");

	private JTextArea jta;

	private ServerSocket serverSocket;

	private String dateString;

	public static void main(String[] args) {
		ChatServer server = new ChatServer();
		server.showServer();
		server.send();
	}

	public void showServer() {
		jta = new JTextArea();
		this.setLayout(new BorderLayout());
		this.add(jta, BorderLayout.CENTER);

		this.setLocation(300, 100);
		this.setSize(500, 400);
		this.setTitle("服务器端");
		this.setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void send() {
		try {
			serverSocket = new ServerSocket(8007);

			while (true) {
				Socket socket = serverSocket.accept();
				System.out.println("一个用户连接上了。。。");
				new Thread(new ClientThread(socket)).start();
			}

		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private class ClientThread implements Runnable {

		private Socket s;

		public ClientThread(Socket s) {
			this.s = s;
		}

		public void run() {
			while (true) {
				try {
					Date currentTime = new Date();
					dateString = format.format(currentTime);
					DataInputStream dis = new DataInputStream(s.getInputStream());
					String str = dis.readUTF();
					DataOutputStream dos = new DataOutputStream(s.getOutputStream());
					dos.writeUTF(str);
					jta.append(dateString + "\n" + str + "\n");
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}