求教socket问题，tcp的socket会自动关掉吗？这中情况是怎么回事？帮忙看看好吗？

Question

好的，帮我看看
 class sender{
  private Socket sendSocket = null;
  private String receiveName ;
  private PrintWriter messageSender = null;
  private int port = 0;
  int builtTimes = 0;
  boolean isBuiltOk = true;
  //--------------------------
  int builtSocket(){
    try{
      sendSocket = new Socket(receiveName,port);
      //System.out.println("send at:"+receiveName+" at port:"+port);
      return 2;
      }catch(UnknownHostException e){
          System.out.println("Unknown host"+receiveName+":"+e);
          return 0;
          }catch(IOException e){
              port++;
              System.out.println("rebuilt at port"+port);
              return 1;
                  }
  }
  //--------------------------
  void sendMessage(String message){
      messageSender.println(message);
  }
  //--------------------------
  public sender(String receiveName , int p){
    this.port = p;
    this.receiveName = receiveName;
    int toBuiltClient = this.builtSocket();
    while(toBuiltClient != 2){
      builtTimes++;
      toBuiltClient = this.builtSocket();
      if (toBuiltClient == 0) break;
      if(this.builtTimes>2) {this.isBuiltOk=false;return;}
      }
      try{
        //System.out.println("trying");
        messageSender = new PrintWriter(sendSocket.getOutputStream(),true);
       }catch(UnknownHostException e){
          System.out.println("Unknown host"+receiveName+":"+e);
          }catch(IOException e){
              System.out.println("Failed I/O to "+receiveName+":"+e);
               }
    }
  }
//
sendTest.sendMessage("r u ok");
sendTest.messageSender.flush();
sendTest.sendMessage("r u ok ag");
sendTest.messageSender.flush();

Answer 1

能收到r u ok
却收不到：r u ok ag
!!!？？？？？？？？？？？？

Answer 2

不用sendTest.messageSender.flush();这句了；
检查一下是不是服务器那端关了，服务器要用一个循环不断read

Answer 3

不可能
看看吧
 public void run(){
         String nowMessage = "";
               while(runing){
                  try {
                  clientSock = severSock.accept();
                 // System.out.println("accept...........");
                  messageReceiver = new BufferedReader(new InputStreamReader(clientSock.getInputStream()));
                  nowMessage = messageReceiver.readLine();
                  jEditorPane1.setText(jEditorPane1.getText()+"\n"+nowMessage);
                  //-----
                  if (nowMessage.equals("NO")){
                      JOptionPane.showMessageDialog(null,"玩家"+joinGame.nPlayer.playersAdress+"不想于你联机","亏!",JOptionPane.INFORMATION_MESSAGE);
                      }
                 //-----------
                  else if (nowMessage.equals("YES")){
                      JOptionPane.showMessageDialog(null,"玩家"+joinGame.nPlayer.playersAdress+"同意于你联机","OK！",JOptionPane.INFORMATION_MESSAGE);
                      joinGame.nowTurn = nowTurn;
                      joinGame.start();
                      System.out.println("joinGame start");
                    }
                 //-----------
                  else if (nowMessage.substring(0,5).equals("hello")){
                    int i = JOptionPane.showConfirmDialog(null,"玩家"+nowMessage.substring(6)+"想与你联机，允许吗？","提示！",JOptionPane.INFORMATION_MESSAGE);
                        sendToJoin = new sender(nowMessage.substring(6),receiverport);
                        if (sendToJoin.isBuiltOk){
                          System.out.println("sendToJoin built ok:"+sendToJoin.receiveName);
                           if (i==0){
                              sendToJoin.sendMessage("YES");
                              hostGame.nPlayer.playersAdress = nowMessage.substring(6);
                              hostGame.nowTurn = nowTurn;
                              hostGame.start();
                              System.out.println(nowMessage.substring(6));
                              System.out.println("hostGame start");
                              }else  sendToJoin.sendMessage("NO");
                //        System.out.println("hostGame still waiting");
                            }
                          }
                    //----------
                   else if (nowMessage.substring(0,7).equals("message")){
                    jEditorPane1.setText(jEditorPane1.getText()+"\n"+":"+nowMessage.substring(8));
                    }
                  //-------------
                  else if (nowMessage.substring(0,8).equals("Position")){
                    StringTokenizer NM = new StringTokenizer(nowMessage,"+");
                    NM.nextToken();
                    String whoTurn = NM.nextToken();
                    System.out.println("receive turn ="+whoTurn);
                    if (whoTurn.equals("joinGame")){
                      if (joinGame.runing){
                        joinGame.nPlayer.xPosition = Integer.parseInt(NM.nextToken());
                        joinGame.nPlayer.yPosition = Integer.parseInt(NM.nextToken());
                        nowTurn = 2;//joinGame.nowTurn;
                        }
                      }
                    else  if (whoTurn.equals("hostGame")){
                      if (hostGame.runing){
                        hostGame.nPlayer.xPosition = Integer.parseInt(NM.nextToken());
                        hostGame.nPlayer.yPosition = Integer.parseInt(NM.nextToken());
                        nowTurn = 1;//hostGame.nowTurn;
                        }
                      }
                   }
                  //receivedMessage = nowMessage;
                  clientSock.close();
                  }catch(IOException e){
                  System.err.println("wrong"+e);
                  }
                 try {
                  this.sleep(500);
                  }
                catch(Exception e){
                      System.out.println("wrong"+e);
                                  }
                  }
    }