package chat;import javax.swing.*;import java.io.*;import java.net.*;import java.awt.event.*;import java.lang.Object;import java.lang.Exception;/** * <p>Title: 使用JAVA制作的局域網聊天程序</p> * <p>Description: 我們的JAVA作業</p> * <p>Copyright: Copyright (c) 2002</p> * <p>Company: </p> * @author RoadAhead * @version 1.0 */public  class   ctools{  static void senddata(String dip,String sdata)  {    try    {      //得到目標機器的地址實例      InetAddress target = InetAddress.getByName(dip);      //將數據轉換成byte類型      byte[] buf = sdata.getBytes();       DatagramSocket sendSocket=new DatagramSocket();       DatagramPacket op = new DatagramPacket(buf, buf.length, target, mainform.PORT);      //將BUF緩沖區中的數據打包       sendSocket.send(op);      //發送數據       sendSocket.close();    }    catch(Exception aa)    {      JOptionPane.showMessageDialog(null, aa.getMessage());    }  }//procedure end  static void WriteToSet(String filename,String text)  //將設置寫到文件中  {    try   {     File file = new File (filename);     FileWriter out = new FileWriter(file);     out.write(text);     out.close();   }   catch (IOException e) {     JOptionPane.showMessageDialog(null, e.getMessage());   }    } //end peocedure    static String readfromset(String fileName)  //從設置文件中讀    {      String rv="";      try      {        RandomAccessFile file = new RandomAccessFile(fileName,"r");        long filepoint=0;        long length=file.length();        mainform.setmyname(file.readLine().trim());        mainform.setmyicon(file.readLine(),1);        rv=file.readLine();        mainform.onstartset=rv;        mainform.winstate=file.readLine();        mainform.onofflinetime=file.readLine().trim();        file.close();      }      catch (IOException e)      {        JOptionPane.showMessageDialog(null, e.getMessage());      }      return(rv) ;//如果是每次啟動時都運行則返回"1"    }    static String ssize(String s,int l)//將字符設為指定長度    {      String r="";      int i;      if (r.length()>l)        r=s.substring(1,l);      else      {        for(i=1;i<=l-s.length();i++)        {          r=r+" ";        }        r=r+s;      }      return(r);    }  //End Procedure    static String topack(String type,String name,String icon) //當類型為"11" or "02"時    {      String r="";      r=type+ssize(name,20)+ssize(icon,5);      return(r);    }    static String topack(String type,String msg) //當類型為"06" or "16" 時    {      String r="";      if (msg.length()>mainform.maxStrCount)        msg=msg.substring(1,mainform.maxStrCount);      r=type+msg;      return(r);    }    static int scanlist(String uip) //查找IP是否存在于數組中,如在則返回    {      int isfind=-1;      String t;      int i;      for(i=1;i<mainform.userlist.length;i++)      {        t=mainform.userlist[i][3];        if (t.equals(uip))        {          isfind=i;          break;        }      };      return(isfind);   }/*增用戶到數組,并返回在數組中的序號 */   static int addtolist(String uname,String uicon,String uip,String ustate)   {     int newsize=mainform.userlist.length;     String[][] ts;     int x,y;     String temp;     ts=new String [newsize+1][5];     for(x=1;x<mainform.userlist.length;x++)//增加 mainform 數組     {       for(y=1;y<mainform.userlist[x].length;y++)       {         ts[x][y]=mainform.userlist[x][y];       }     }     ts[newsize][1]=uname;     ts[newsize][2]=uicon;     ts[newsize][3]=uip;     ts[newsize][4]=ustate;     mainform.userlist=ts;     //增加到用戶圖象按鈕數組     JButton[] ts2;     ts2=new JButton[newsize+1];     for(x=1;x<mainform.but_userlist.length;x++)     {       ts2[x]=mainform.but_userlist[x];     };     mainform.but_userlist=ts2;     JButton tmpbut=new JButton();     Icon myicon=new ImageIcon("face/"+uicon+"-"+ustate+".gif");     tmpbut.setIcon(myicon);     tmpbut.setText(uname);     tmpbut.setHorizontalTextPosition(SwingConstants.CENTER );     tmpbut.setVerticalTextPosition(SwingConstants.BOTTOM);     temp=ctools.ssize(uip,15)+uicon;     tmpbut.setName(temp);     tmpbut.setBackground(mainform.ed_show.getBackground());     tmpbut.addActionListener(new ActionListener(){       public void mouseExited(MouseEvent e)       {         //setBorder(BorderFactory.createRaisedBevelBorder());       }       public void actionPerformed(ActionEvent ae)       {         String tmpstr;         tmpstr=ae.toString();         int temp;         temp=tmpstr.lastIndexOf("cmd=")+4;         mainform.setusername(tmpstr.substring(temp,tmpstr.lastIndexOf(",when=")).trim());         temp=tmpstr.lastIndexOf("on");         mainform.setuserip(tmpstr.substring(temp+3,temp+18).trim());         tmpstr=tmpstr.substring(temp+18,tmpstr.length());         mainform.setusericon(tmpstr.trim(),"1");         mainform.ed_input.grabFocus();       }});     mainform.but_userlist[newsize]=tmpbut;     mainform.but_userlist[newsize].setVisible(true);     mainform.pan_userlist.add(mainform.but_userlist[newsize]);//     prarray(mainform.userlist); //打印數組,只用于測試     return(newsize);   }   static void prarray(String[][] sz)   {     int x=1,y=1;     for(x=1;x<sz.length;x++)     {       for(y=1;y<sz[x].length;y++)       {         System.out.print(sz[x][y]);       }       System.out.print("\n");     }   }static String bytetostr(byte[] yb,int len){  String rs="";  int i=0;  char c;  for(i=0;i<len;i++)  {    c=(char)yb[i];    rs=rs+String.valueOf(c);  }  return(rs);}static void setuserstate(int bh,String state) //設置用戶狀態{  String icon;  mainform.userlist[bh][4]=state;  icon=mainform.userlist[bh][2].trim();  icon="face/"+icon+"-"+state.trim()+".gif";  Icon myicon=new ImageIcon(icon);  mainform.but_userlist[bh].setIcon(myicon);}}