java socket 客户端之间通信有关问题

java socket 客户端之间通信问题。
客户端登陆后，用户成员列表一直为空。以下是服务端与客户端的源代码。望大师能多多指教。补充下，客户端运行后，会抛出异常如下：Exception in thread "Thread-2" java.util.NoSuchElementException
        at java.util.StringTokenizer.nextToken(Unknown Source)
        at chatFrame.run(Chat.java:199)
        at java.lang.Thread.run(Unknown Source)
 我是菜鸟，整了半天，也不知道该怎么解决，特来此请教大师。望能高抬贵手，给出解决之法……
  服务器端源代码：
  
import java.io.*;
import java.net.*;
import java.util.*;

public class Server extends ServerSocket 
 {
    
    static final int SERVER_PORT=10000;

   Vector<Object> vector1=new Vector<Object>();
   Vector<Object> vector2=new Vector<Object>();

  public Server() throws IOException
 {
     super(SERVER_PORT);
     
     try{

      while(true)
    {
       System.out.println("等待客户连接……");
      
      Socket socket=accept();
   
      new CreateServerThread(socket,vector1,vector2);
    }
   }
     catch(IOException e){System.out.println("客户连接错误");}
     finally
    {
       close();
     }
  }

   public static void main(String[] args) throws IOException
  {

     new Server();
   }
 }

    class CreateServerThread extends Thread
  {
      Socket  socket;
      DataInputStream in;
      DataOutputStream out;
   
      Vector<Object> vector1;
      Vector<Object> vector2;
     
     public  boolean bool=false;
     String  revStr=null;
     String string=null;
     
     int userID;
     String str=null;
     Enumeration enu;
     
      public CreateServerThread(Socket s,Vector<Object> vec1,Vector<Object> vec2)throws IOException
  {
       
      socket=s;
      vector1=vec1;
      vector2=vec2;
      out=new DataOutputStream(socket.getOutputStream());
      in=new DataInputStream(socket.getInputStream());

      start();
  }

  public void run()
  {
      StringTokenizer st;
      StringTokenizer  stc;

     try{
        while(true)
     {
         revStr=in.readUTF();

         if(revStr.startsWith("新用户"));
        {
         if(vector1.contains(revStr))
       
          { out.writeUTF("该用户名已注册");}
         else 
         {
           System.out.println("收到客户的登录信息……"+revStr);
            out.writeUTF("可以注册");
            
            str=revStr;

            vector1.add(revStr);
 
            Enumeration enu=vector1.elements();
            while(enu.hasMoreElements())
          {
              out.writeUTF((String)enu.nextElement());
            }
            bool=true;
          Enumeration enuc=vector2.elements();
          
          while(enuc.hasMoreElements())
           {
             CreateServerThread th=(CreateServerThread)enuc.nextElement();
             th.out.writeUTF(revStr);
            }
        stc=new StringTokenizer(revStr,":");
        string=stc.nextToken();
        string=stc.nextToken();
        Enumeration enuc1=vector2.elements();
       while(enuc1.hasMoreElements())
       {
             CreateServerThread th=(CreateServerThread)enuc1.nextElement();
         th.out.writeUTF(string+"……上线了");
        }
         vector2.add(this);
       }
      }

       if (revStr.startsWith("下线了")||socket.isClosed())
     {
         st=new StringTokenizer(revStr,":");
         string=st.nextToken();
         string=st.nextToken();
         userID=vector1.indexOf(str);
         vector1.remove(userID);
      

         Enumeration enu=vector2.elements();
        
        while(enu.hasMoreElements())
      {
          CreateServerThread th=(CreateServerThread)enu.nextElement();
          if(th!=this && th.isAlive())
            th.out.writeUTF("下线了："+str.substring(str.indexOf(":")+1));
           th.out.writeUTF(str.substring(str.indexOf(":")+1)+"……下线了");
      }
       vector2.remove(this);
      break;
     }  
         else 
        {
           enu=vector2.elements();
            while(enu.hasMoreElements())
       {
          CreateServerThread th=(CreateServerThread)enu.nextElement();
          th.out.writeUTF(revStr);
       }
      }
     }
    }
          catch(IOException e)
   {
        try{
            userID=vector1.indexOf(str);
            vector1.remove(userID);
           Enumeration enun=vector2.elements();
         while(enun.hasMoreElements())
     {
           CreateServerThread th=(CreateServerThread)enun.nextElement();
         if(th!=this && th.isAlive())
          th.out.writeUTF("下线了:"+str.substring(str.indexOf(":")+1));
          th.out.writeUTF(str.substring(str.indexOf(":")+1)+"……下线了");
     }
      vector2.remove(this);
      return;
   } catch(Exception ee){return;}
  }
 }
}
         


[解决办法]
客户端源代码


      
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
import java.util.*;

//多用户聊天室客户端主程序(主程序)//

  public class Chat{

   boolean packFrame=false;
  Chat()
  {
      chatFrame frame=new chatFrame();

      Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
      Dimension frameSize=frame.getSize();
      

      if(frameSize.height>screenSize.height)
      {
         frameSize.height=screenSize.height;
       }
      if(frameSize.width>screenSize.width)
       {
           frameSize.width=screenSize.width;
        }
       frame.setLocation((screenSize.width-frameSize.width)/2,(screenSize.height-frameSize.height)/2);
    }
public static void main(String[] args)
   {
          SwingUtilities.invokeLater(new Runnable()
         {
          public void run()
      {   new Chat();}
        });
     }
 }
   





// 实现客户端聊天功能程序//
 class chatFrame extends JFrame implements ActionListener,Runnable
 {
          LoginFrame frame=new LoginFrame();
        Thread thread;
       JPanel contentPane;
       JScrollPane jscrollpane1=new JScrollPane();
       JScrollPane jscrollpane2=new JScrollPane();
       JButton jBtnSend=new JButton("发送");
       JButton jBtnClear=new JButton("清空");
       
      JTextArea jTextArea1=new JTextArea();
      JTextArea jTextArea2=new JTextArea();
     
      JScrollPane jscrollpane3=new JScrollPane();
      JList<Object> jList1=new JList<Object>();
     Socket socket;
     int port=10000;
     DataInputStream in;
     DataOutputStream out;
     Vector<Object> vector=new Vector<Object>();
     String chatstr,str;

    public chatFrame()
  {
         setTitle("逍遥聊天室");
         setSize(602,515);
         this.setResizable(false);
         this.setVisible(false);
        try
        {
                   setDefaultCloseOperation(EXIT_ON_CLOSE);
                   addWindowListener(new WindowAdapter()
            {
                 public void windowClosing(WindowEvent e)

               {
               try{
                 out.writeUTF("下线了:"+frame.name+"/"+frame.sex);
                 out.close();
                 in.close();
                 socket.close();
                }
                catch(Exception ee){}
                  finally
                {
                      frame.dispose();
                    dispose();
                   }
                 }
             }
        );
         jbInit();
    } catch (Exception exception)
     {  exception.printStackTrace();}
     }

      void jbInit() throws Exception{
          frame.setVisible(true);
          jscrollpane1.setBounds(2,2,445,320);
          jscrollpane2.setBounds(1,333,448,95);
          jscrollpane3.setBounds(458,6,139,424);
          jBtnSend.setBounds(93,441,78,31);
          jBtnClear.setBounds(185,441,76,31);
          jTextArea1.setEditable(false);
          contentPane=(JPanel)getContentPane();
          contentPane.setLayout(null);
          contentPane.add(jscrollpane2);
          contentPane.add(jscrollpane1,null);
          contentPane.add(jscrollpane3);
          contentPane.add(jBtnSend);
          contentPane.add(jBtnClear);
          jscrollpane1.getViewport().add(jTextArea1);
          jscrollpane2.getViewport().add(jTextArea2);
          jscrollpane3.getViewport().add(jList1);
          jBtnClear.addActionListener(this);
          jBtnSend.addActionListener(this);

       try{
         InetAddress address=InetAddress.getLocalHost();
         socket=new Socket(address.getHostAddress(),port);
        // socket=new Socket("127.0.0.1",port);//
         in=new DataInputStream(socket.getInputStream());
         out=new DataOutputStream(socket.getOutputStream());
        }  catch(Exception e){
          setVisible(true);
          jTextArea2.setText("无法与服务器连接，请退出……");
         } 
              if(thread == null)
   {
       thread = new Thread(this);
       thread.start();
    }
      frame.setClection(socket,in,out);
   }
    public void actionPerformed(ActionEvent e)
     {
             if(e.getSource()==jBtnSend)
         {
          sendStr();
          }
        if(e.getSource()==jBtnClear)
     { jTextArea1.setText("");
     }
   }
       public void sendStr()
    {
       chatstr=jTextArea2.getText();
          if(chatstr.equals(""))
       {
          jTextArea1.setText("不能发送内容为空");
        return;
       }
        try{
          out.writeUTF(frame.name+":"+chatstr);
           jTextArea2.setText("");
       }catch(Exception ee){   }
    }
    
     public void run()
   {
        String s1=null;
        String ss=null;
        String s=null;
   while(true)
    {
         try{
         s1=in.readUTF();}
      catch(Exception ee)
  {
     vector.removeAllElements();
     jList1.setListData(vector);
     jTextArea2.setText("已经与服务器断开……");
     return;
   }
   if(s1.startsWith("可以注册"))
      {
       frame.setVisible(false);
       setVisible(true);

       setTitle("昵称……"+frame.getName());

       continue;
     }
    else if(s1.startsWith("该用户名已注册"))
  {
    frame.jTextField1.setText("请重新输入昵称");
     continue;
   }
  else if(s1.startsWith("新用户"))
  {
     StringTokenizer st=new StringTokenizer(s1,"：");
     ss=null; s=null;
     ss=st.nextToken();
     s=st.nextToken();
     vector.addElement(s);
     jList1.setListData(vector);
      continue;
   }
  else if(s1.startsWith("下线了"))
  {
     StringTokenizer st=new StringTokenizer(s1,":");

         ss=null; s=null;
     ss=st.nextToken();
     s=st.nextToken();
     vector.removeElement(s);
     jList1.setListData(vector);
      continue;
   }
   jTextArea1.append(s1+"\n");
  } 
 }
}
  






//    客户端主程序登录界面//
 class LoginFrame extends JFrame implements ActionListener
  {
         
      JPanel  contentPane;
      JLabel  jLabel1=new JLabel();
      JTextField jTextField1=new JTextField();
      ButtonGroup buttonGroup1=new  ButtonGroup();
      JRadioButton   jRadioButton1=new JRadioButton("男");
      JRadioButton   jRadioButton2=new  JRadioButton("女");
        
      JLabel  jLabel2=new JLabel("性别");
      JButton jButton1=new JButton();
      JButton jButton2=new JButton();
       
      String sex="男";
      String  name=null;
      boolean bool=false;
      
      Socket socket;
      DataInputStream in;
      DataOutputStream out;

 public LoginFrame()
{

     setSize(new Dimension(400,210));
     setTitle("登录界面");
     setVisible(true);
     contentPane=(JPanel)getContentPane();
     contentPane.setLayout(null);
     this.setResizable(false);
     jLabel1.setFont(new Font("Dialog",15,15));
     jLabel1.setText("请输入您的昵称:");
     jLabel1.setBounds(53,20,113,44);
    
     jTextField1.setBounds(182,25,154,33);
     
     jRadioButton1.setFont(new Font("Dialog",Font.PLAIN,13));

     jRadioButton1.setSelected(true);
     jRadioButton1.setBounds(186,64,91,25);
     jRadioButton1.addActionListener(this);
     
     jRadioButton2.setFont(new Font("Dialog",Font.PLAIN,13));
     jRadioButton2.setBounds(187,90,91,25);
     jRadioButton2.addActionListener(this);

     jLabel2.setFont(new Font("Dialog",Font.PLAIN,15));
     jLabel2.setBounds(136,80,34,16);
     
     jButton1.setBounds(182,138,71,25);
     jButton1.setText("确定");
     jButton1.addActionListener(this);
     jButton2.setBounds(264,138,71,25);
     jButton2.setText("取消");
     jButton2.addActionListener(this);
   
     contentPane.add(jLabel1);
     contentPane.add(jTextField1);
     contentPane.add(jRadioButton1);
     contentPane.add(jRadioButton2);
     contentPane.add(jLabel2);
     contentPane.add(jButton2);
     contentPane.add(jButton1);
     buttonGroup1.add(jRadioButton1);
     buttonGroup1.add(jRadioButton2);
   Dimension screenSize=Toolkit.getDefaultToolkit().getScreenSize();
   Dimension frameSize=getSize();

    if(frameSize.height>screenSize.height)
  {  frameSize.height=screenSize.height;}
    if(frameSize.width>screenSize.width)
 {   frameSize.width=screenSize.width;}
 setLocation((screenSize.width-frameSize.width)/2, (screenSize.height-frameSize.height)/2);
    setVisible(true);
  }
 

  public void setClection(Socket soc,DataInputStream din,DataOutputStream dout)
  {
     socket=soc;
     in=din;
     out=dout;
  }

  public String getName(){
       return name;
  }

 public void actionPerformed(ActionEvent e)
 {
   if(e.getSource() == jRadioButton1)  sex="男";
   if(e.getSource() == jRadioButton2)  sex="女";
   if(e.getSource() == jButton2) jTextField1.setText("");
   else if(e.getSource()==jButton1)
 {
     if(jTextField1.getText().equals(""))
   {
       jTextField1.setText("请输入昵称");
       return;
   }
     name=jTextField1.getText();
    try{
         out.writeUTF("新用户:"+name+"/"+sex);
     } catch(Exception ee){return;}
   }
  }
 }



[解决办法]
偶然想出了这个问题的解决之法
[解决办法]
Exception in thread "Thread-2" java.util.NoSuchElementException

已经被你next到尾了，没得next了，所以就异常了。

如果要安全就用hasMoreTokens()来做检测。


不过老实说，你这个通讯写的太复杂了，借助点现成手段吧。。。

把你要发送的数据，封装成值对象，然后用 ObjectOutputStream写，用ObjectInputStream读，就好了。

或者封装成JSON串，然后直接发送字符串和接受字符串，再重构对象，都很方便，没必要自己hardcode协议解析过程。