import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.awt.event.*;
public class ChatClient extends Applet{
protected boolean loggedIn;//登入狀態
protected Frame cp;//聊天室框架
protected static int PORTNUM=7777; //缺省端口號7777
protected int port;//實際端口號
protected Socket sock;
protected BufferedReader is;//用於從sock讀取數據的BufferedReader
protected PrintWriter pw;//用於向sock寫入數據的PrintWriter
protected TextField tf;//用於輸入的TextField
protected TextArea ta;//用於顯示對話的TextArea
protected Button lib;//登入按鈕
protected Button lob;//登出的按鈕
final static String TITLE ="Chatroom applet>>>>>>>>>>>>>>>>>>>>>>>>";
protected String paintMessage;//發表的消息
public ChatParameter Chat;
public void init(){
paintMessage="正在生成聊天窗口";
repaint();
cp=new Frame(TITLE);
cp.setLayout(new BorderLayout());
String portNum=getParameter("port");//呢個參數勿太明
port=PORTNUM;
if (portNum!=null) //書上是portNum==null,十分有問題
port=Integer.parseInt(portNum);
//CGI
ta=new TextArea(14,80);
ta.setEditable(false);//read only attribute
ta.setFont(new Font("Monospaced",Font.PLAIN,11));
cp.add(BorderLayout.NORTH,ta);
Panel p=new Panel();
Button b;
//for login button
p.add(lib=new Button("Login"));
lib.setEnabled(true);
lib.requestFocus();
lib.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e){
login();
lib.setEnabled(false);
lob.setEnabled(true);
tf.requestFocus();//將鍵盤輸入鎖定再右邊的文本框中
}
});
//for logout button
p.add(lob=new Button ("Logout"));
lob.setEnabled(false);
lob.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
logout();
lib.setEnabled(true);
lob.setEnabled(false);
lib.requestFocus();
}
});
p.add(new Label ("輸入消息:"));
tf=new TextField(40);
tf.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(loggedIn){
//pw.println(Chat.CMD_BCAST+tf.getText());//Chat.CMD....是咩野來?
int j=tf.getText().indexOf(":");
if(j>0) pw.println(Chat.CMD_MESG+tf.getText());
else
pw.println(Chat.CMD_BCAST+tf.getText());
tf.setText("");//勿使用flush()?
}
}
});
p.add(tf);
cp.add(BorderLayout.SOUTH,p);
cp.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
//如果執行了setVisible或者dispose,關閉窗口
ChatClient.this.cp.setVisible(false);
ChatClient.this.cp.dispose();
logout();
}
});
cp.pack();//勿明白有咩用?
//將Frame cp放在中間
Dimension us=cp.getSize(),
them=Toolkit.getDefaultToolkit().getScreenSize();
int newX=(them.width-us.width)/2;
int newY=(them.height-us.height)/2;
cp.setLocation(newX,newY);
cp.setVisible(true);
paintMessage="Window should now be visible";
repaint();
}
//登錄聊天室
public void login(){
if(loggedIn) return;
try{
sock=new Socket(getCodeBase().getHost(),port);
is=new BufferedReader(new InputStreamReader(sock.getInputStream()));
pw=new PrintWriter(sock.getOutputStream(),true);
}catch(IOException e){
showStatus("Can't get socket: "+e);
cp.add(new Label("Can't get socket: "+e));
return;}
//構造並且啟動讀入器,從服務器讀取數據,輸出到文本框中
//這裏,長成壹個線程來避免鎖住資源(lockups)
new Thread (new Runnable(){
public void run(){
String line;
try{
while(loggedIn &&((line=is.readLine())!=null))
ta.appendText(line+"\n");
}catch(IOException e){
showStatus("我的天啊,掉線了也!!!!");
return;
}
}
}).start();
//假定登錄(其實只是打印相關信息,並沒有真正登錄)
// pw.println(Chat.CMD_LOGIN+"AppletUser");
pw.println(Chat.CMD_LOGIN+"AppletUser");
loggedIn =true;
}
//模仿退出的代碼
public void logout(){
if(!loggedIn)
return;
loggedIn=false;
try{
if(sock!=null)
sock.close();
}catch(IOException ign){
// 異常處理哦
}
}
//沒有設置stop的方法,即使從瀏覽器跳到另外壹個網頁的時候
//聊天程序還可以繼續運行
public void paint(Graphics g){
Dimension d=getSize();
int h=d.height;
int w=d.width;
g.fillRect(0,0,w,2);
g.setColor(Color.black);
g.drawString(paintMessage,10,(h/2)-5);
}
}
聊天室服務器端
import java.net.*;
import java.io.*;
import java.util.*;
public class ChatServer{
//聊天室管理員ID
protected final static String CHATMASTER_ID="ChatMaster";
//系統信息的分隔符
protected final static String SEP=": ";
//服務器的Socket
protected ServerSocket servSock;
//當前客戶端列表
protected ArrayList clients;
//調試標記
protected boolean DEBUG=false;
public ChatParameter Chat;
//主方法構造壹個ChatServer,沒有返回值
public static void main(String[] argv){
System.out.println("Chat server0.1 starting>>>>>>>>>>>>>>>>");
ChatServer w=new ChatServer();
w.runServer();
System.out.println("***ERROR*** Chat server0.1 quitting");
}
//構造和運行壹個聊天服務
ChatServer(){
Chat=new ChatParameter();
clients=new ArrayList();
try{
servSock=new ServerSocket(7777);//實有問題拉,不過可能是他自己定義既壹個class.
System.out.println("Chat Server0.1 listening on port:"+7777);
}catch(Exception e){
log("IO Exception in ChatServer.<init>");
System.exit(0);
}
}
public void runServer(){
try{
while(true){
Socket us=servSock.accept();
String hostName=us.getInetAddress().getHostName();
System.out.println("Accpeted from "+hostName);
//壹個處理的線程
ChatHandler cl=new ChatHandler(us,hostName);
synchronized(clients){
clients.add(cl);
cl.start();
if(clients.size()==1)
cl.send(CHATMASTER_ID,"Welcome!You are the first one here");
else{
cl.send(CHATMASTER_ID,"Welcome!You are the latest of"+
clients.size()+" users.");
}
}
}
}catch(Exception e){
log("IO Exception in runServer:"+e);
System.exit(0);
}
}
protected void log(String s){
System.out.println(s);
}
//處理會話的內部的類
protected class ChatHandler extends Thread {
//客戶端scoket
protected Socket clientSock;
//讀取socket的BufferedReader
protected BufferedReader is ;
//在socket 上發送信息行的PrintWriter
protected PrintWriter pw;
//客戶端出主機
protected String clientIP;
//句柄
protected String login;
public ChatHandler (Socket sock,String clnt)throws IOException {
clientSock=sock;
clientIP=clnt;
is=new BufferedReader(
new InputStreamReader(sock.getInputStream()));
pw=new PrintWriter (sock.getOutputStream(),true);
}
//每壹個ChatHandler是壹個線程,下面的是他的run()方法
//用於處理會話
public void run(){
String line;
try{
while((line=is.readLine())!=null){
char c=line.charAt(0);//我頂妳老母啊 ,果只Chat.CMD咩xx冇定義 撲啊///!!!
line=line.substring(1);
switch(c){
//case Chat.CMD_LOGIN:
case 'l':
if(!Chat.isValidLoginName(line)){
send(CHATMASTER_ID,"LOGIN"+line+"invalid");
log("LOGIN INVALID from:"+clientIP);
continue;
}
login=line;
broadcast(CHATMASTER_ID,login+" joins us,for a total of"+
clients.size()+" users");
break;
// case Chat.CMD_MESG:
case 'm':
if(login==null){
send(CHATMASTER_ID,"please login first");
continue;
}
int where =line.indexOf(Chat.SEPARATOR);
String recip=line.substring(0,where);
String mesg=line.substring (where+1);
log("MESG: "+login+"--->"+recip+": "+mesg);
ChatHandler cl=lookup(recip);
if(cl==null)
psend(CHATMASTER_ID,recip+"not logged in.");
else
cl.psend(login,mesg);
break;
//case Chat.CMD_QUIT:
case 'q':
broadcast(CHATMASTER_ID,"Goodbye to "+login+"@"+clientIP);
close();
return;//ChatHandler結束
// case Chat.CMD_BCAST:
case 'b':
if(login!=null)
broadcast(login,line);
else
log("B<L FROM"+clientIP);
break;
default:
log("Unknow cmd"+c+"from"+login+"@"+clientIP);
}
}
}catch(IOException e){
log("IO Exception :"+e);
}finally{
//sock 結束,我們完成了
//還不能發送再見的消息
//得有簡單的基於命令的協議才行
System.out.println(login+SEP+"All Done");
synchronized(clients){
clients.remove(this);
if(clients.size()==0){
System.out.println(CHATMASTER_ID+SEP+
"I'm so lonely I could cry>>>>>");
}else if(clients.size()==1){
ChatHandler last=(ChatHandler)clients.get(0);
last.send(CHATMASTER_ID,"Hey,you are talking to yourself again");
}
else{
broadcast(CHATMASTER_ID,"There are now"+clients.size()+" users");
}
}
}
}
protected void close(){
if(clientSock==null){
log("close when not open");
return;
}
try{
clientSock.close();
clientSock=null;
}catch(IOException e){
log("Failure during close to "+clientIP);
}
}
//發送壹條消息給用戶
public void send(String sender,String mesg){
pw.println(sender+SEP+"*>"+mesg);
}
//發送私有的消息
protected void psend(String sender ,String msg){
send("<*"+sender+"*>",msg);
}
//發送壹條消息給所有的用戶
public void broadcast (String sender,String mesg){
System.out.println("Broadcasting"+sender+SEP+mesg);
for(int i=0;i<clients.size();i++){
ChatHandler sib=(ChatHandler)clients.get(i);
if(DEBUG)
System.out.println("Sending to"+sib);
sib.send(sender,mesg);
}
if(DEBUG) System.out.println("Done broadcast");
}
protected ChatHandler lookup(String nick){
synchronized(clients){
for(int i=0;i<clients.size();i++){
ChatHandler cl=(ChatHandler)clients.get(i);
if(cl.login.equals(nick))
return cl;
}
}
return null;
}
//將ChatHandler對象轉換成壹個字符串
public String toString(){
return "ChatHandler["+login+"]";
}
}
}
public class ChatParameter {
public static final char CMD_BCAST='b';
public static final char CMD_LOGIN='l';
public static final char CMD_MESG='m';
public static final char CMD_QUIT='q';
public static final char SEPARATOR=':';//?
public static final int PORTNUM=7777;
public boolean isValidLoginName(String line){
if (line.equals("CHATMASTER_ID"))
return false;
return true;
}
public void main(String[] argv){
}
}
由於界面原因 所以比較亂 全部復制出去 重新整理壹下就行了/