void ed_input_keyTyped(KeyEvent e)  {    if((mainform.onlinestate!=1)&(e.isAltDown()))    {      JOptionPane.showMessageDialog(null, "沒有處于在線狀態(tài),不能發(fā)送消息!");      return;    }    if ((!cbo_bc.isSelected())&(mainform.getuserip().trim()=="")&e.isAltDown())    {      JOptionPane.showMessageDialog(null,"你還沒有選擇給誰發(fā)消息!");      return;    }    String userinput;    userinput=ed_input.getText().trim();    if (e.isAltDown()&(e.getKeyChar()=='\n'))    {      if (cbo_bc.isSelected())        userinput=ctools.topack("16",userinput);      else        userinput=ctools.topack("06",userinput);        ed_show.append("我對"+curusername+"說："+ed_input.getText());      ctools.senddata(mainform.getuserip(),userinput);      ed_input.setText("");      if(winstate.equals("1"))        this.setState(ICONIFIED);    }  }//end procedure  void but_setup_actionPerformed(ActionEvent e)  {    frm_set fw=new frm_set();    fw.setVisible(true);  } //procedurte endstatic void setuserip(String ip) {  curuserip=ip; }//end procedurestatic String getuserip(){  return(curuserip);}//end procedurestatic void setusername(String name){  curusername=name;  lab_uname.setText("當(dāng)前用戶名: "+name);}//end procedurestatic String getusername(){  return(curusername);}//end procedurestatic void setusericon(String icon,String state){  curusericon=icon;  Icon myicon=new ImageIcon("face/"+icon.trim()+"-1.gif");  lab_uimage.setIcon(myicon);}//end procedurestatic String getusericon(){  return(curusericon);}static void setmyname(String name){  myname=name;  lab_my.setText(" "+name+" ");}//end procedurestatic String getmyname(){  return(myname);}//end procedurestatic void setmyicon(String icon,int state){  myicon=icon;  Icon myicon=new ImageIcon("face/"+icon.trim()+"-1.gif");  lab_my.setIcon(myicon);}//end procedurestatic String getmyicon(){  return(myicon);}  void but_exit_keyTyped(KeyEvent e)  { System.exit(0);  }  void but_exit_mousePressed(MouseEvent e)  { System.exit(0);  }  void this_windowOpened(WindowEvent e)  {    String r;    r=ctools.readfromset(filename).trim();    if (r.equals("1"))    {      frm_set fs=new frm_set();      fs.show(true);    }  } //end procedure  void but_online_actionPerformed(ActionEvent e)  {    if (onlinestate==2)    {      //修改      if (!mythread.isAlive() )        mythread.start();      else        mythread.resume();      //end      String s;      s=ctools.topack("11",myname,myicon);      ctools.senddata("255.255.255.255",s); //戶發(fā)出上線通知      onlinestate=1;      lab_info.setText("已經(jīng)連接!");    }    onlinestate=1;  }  void but_about_actionPerformed(ActionEvent e)  {    frm_about fa=new frm_about();    fa.show();  }class newthread extends Thread{  public void run()  {   String data="";   String ip="";   String type;   while(true)   {     try{       byte[] array=new byte[maxStrCount];       receivepacket=new DatagramPacket(array,array.length);       receivesocket.receive(receivepacket);       ip=receivepacket.getAddress().toString();       ip=ip.substring(ip.indexOf("/")+1,ip.length()).trim();  //取出IP地址       //如果是收到自己的消息       if (ip.equals(mainform.myip))       {         continue;       }       data=ctools.bytetostr(receivepacket.getData(),receivepacket.getLength());       type=data.substring(0,2);       switch(Integer.parseInt(type))       {         case 2:  //當(dāng)有用戶發(fā)出上線通知時         {           String tname;           String ticon;           int idx;           int bh;           tname=data.substring(2,22).trim();           ticon=data.substring(22,27).trim();           idx=ctools.scanlist(ip);           if (idx<0)           {             ctools.addtolist(tname,ticon,ip,"1");           };           bh=ctools.scanlist(ip);           if (bh>=0)           {             ctools.setuserstate(bh,"1");           }           break;         }         case 3: //收到某用戶斷線的消息         {           int bh;           bh=ctools.scanlist(ip);           if (bh>=0)           {             ctools.setuserstate(bh,"2");           }           break;         }         case 4://離線         {           int bh;           bh=ctools.scanlist(ip);           if (bh>=0)           {             ctools.setuserstate(bh,"3");           }           mainform.onlinestate=3;           break;         }         case 6://聊天消息         {           String msg;           String tname;           int idx;           msg=data.substring(2,data.length());           idx=ctools.scanlist(ip);           if (idx>0)             tname=mainform.userlist[idx][1].trim();           else           {             tname="未知用戶(正在查詢): ";             ctools.senddata(ip,"12");           }           ed_show.append(nowtime.toLocaleString()+"  "+tname+": "+msg+'\n');           if(onlinestate==3) //如用戶為離線狀態(tài),則自動發(fā)送消息           {             ctools.senddata(ip,"06"+onofflinetime);           }           break;         }         case 11:  //當(dāng)有用戶發(fā)出上線通知時         {           String tname;           String ticon;           int idx;           int bh;           tname=data.substring(2,22).trim();           ticon=data.substring(22,27).trim();           idx=ctools.scanlist(ip);           if (idx<0)           {             ctools.addtolist(tname,ticon,ip,"1");           };           String hpack=ctools.topack("02",myname,myicon);           ctools.senddata(ip,hpack);           bh=ctools.scanlist(ip);           if (bh>=0)           {             ctools.setuserstate(bh,"1");           }           break;         }         case 12://收到詢問自已信息的消息         {           String ts;           ts=ctools.topack("11",myname,myicon);           ctools.senddata(ip,ts);           break;         }         case 14:  //重新上線         {           int bh;           bh=ctools.scanlist(ip);           if (bh>=0)           {             ctools.setuserstate(bh,"1");           }           else             ctools.senddata(ip,"12");           mainform.onlinestate=1;           break;         }       case 16: //收到廣播消息       {         String msg;         String tname;         int idx;         msg=data.substring(2,data.length());         idx=ctools.scanlist(ip);         if (idx>0)           tname=mainform.userlist[idx][1].trim();         else         {           tname="未知用戶(正在查詢): ";           ctools.senddata(ip,"12");         }         ed_show.append(nowtime.toLocaleString()+"  "+tname+"* "+msg+'\n');         break;       }       }//end case     }     catch(IOException se){   //    lab_info.setText(se.toString());     }   }  }}  void but_offline_actionPerformed(ActionEvent e)  {    if (onlinestate!=2)    {//      mythread.stop(); // 由于演示需要,線程未停止,所以再次啟動會出錯      mythread.suspend();//      String hpack;      ctools.senddata("255.255.255.255","03");      mainform.onlinestate=2;      lab_info.setText("已經(jīng)下線,你不能再收發(fā)消息!");    }  }  void but_online_mouseMoved(MouseEvent e)  {    but_online.setBorder(BorderFactory.createRaisedBevelBorder());  }  void but_offline_mouseMoved(MouseEvent e)  {    but_offline.setBorder(BorderFactory.createRaisedBevelBorder());  }  void but_setup_mouseMoved(MouseEvent e)  {    but_setup.setBorder(BorderFactory.createRaisedBevelBorder());  }  void but_about_mouseMoved(MouseEvent e)  {    but_about.setBorder(BorderFactory.createRaisedBevelBorder());  }  void but_exit_mouseMoved(MouseEvent e)  {    but_exit.setBorder(BorderFactory.createRaisedBevelBorder());  }  void but_online_mouseExited(MouseEvent e)  {    but_online.setBorder(BorderFactory.createEmptyBorder());  }  void but_offline_mouseExited(MouseEvent e)  {    but_offline.setBorder(BorderFactory.createEmptyBorder());  }  void but_setup_mouseExited(MouseEvent e)  {    but_setup.setBorder(BorderFactory.createEmptyBorder());  }  void but_about_mouseExited(MouseEvent e)  {    but_about.setBorder(BorderFactory.createEmptyBorder());  }  void but_exit_mouseExited(MouseEvent e)  {    but_exit.setBorder(BorderFactory.createEmptyBorder());  }  void ed_show_mouseReleased(MouseEvent e)  {    if (e.isPopupTrigger())    {      pop_menu.show(e.getComponent(),e.getX(),e.getY());    }  }  void jMenuItem1_menuKeyReleased(MenuKeyEvent e)  {    mainform.ed_show.setText("");  }  void jMenuItem2_mouseReleased(MouseEvent e)  {     JFileChooser fc = new JFileChooser();    if (JFileChooser.APPROVE_OPTION == fc.showOpenDialog(this)) {      ctools.WriteToSet(fc.getSelectedFile().getPath(),ed_show.getText());    }  }  void but_pause_actionPerformed(ActionEvent e)  {    if (onlinestate==1)    {      Icon iconfh=new ImageIcon("fh.gif");      but_pause.setIcon(iconfh);      String hpack;      ctools.senddata("255.255.255.255","04");      mainform.onlinestate=3;      lab_info.setText("暫時離線");      but_pause.setText("返回");      return;    }    if (onlinestate==3)    {      Icon iconlk=new ImageIcon("lk.gif");      but_pause.setIcon(iconlk);      String hpack;      ctools.senddata("255.255.255.255","14");      mainform.onlinestate=1;      lab_info.setText("上線");      but_pause.setText("離開");      return;    }  }  void but_pause_mouseExited(MouseEvent e)  {    but_pause.setBorder(BorderFactory.createEmptyBorder());  }  void but_pause_mouseMoved(MouseEvent e)  {    but_pause.setBorder(BorderFactory.createRaisedBevelBorder());  }}