很详细！
/**
* 聊天室的客户端程序，GUI界面。
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.Socket;
import java.util.StringTokenizer;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.border.TitledBorder;
/**
* 聊天室的客户端程序，GUI界面。
*/
public class ChatClient extends JFrame implements ActionListener{
// 登陆聊天室的名字标签和输入框
JLabel nameLabel = new JLabel();
JTextField nameTextField = new JTextField(15);
// 连接和断开连接的按钮
JButton connectButton = new JButton();
JButton disConnectButton = new JButton();
// 聊天室内容的文本域
JTextArea chatContentTextArea = new JTextArea(9, 30);
// 发送消息的按钮
JButton sendMsgButton = new JButton();
// 消息输入框
JTextField msgTextField = new JTextField(20);
JLabel msglabel = new JLabel();
// 聊天室用户列表
java.awt.List peopleList = new java.awt.List(10);
/*以下定义数据流和网络变量*/
Socket soc = null;
PrintStream ps = null;
// 客户端侦听服务器消息的线程
ClentListener listener = null;
public ChatClient() {
init();
}
// 初始化图形界面
public void init() {
this.setTitle("聊天室客户端");
// 初始化按钮和标签
nameLabel.setText("姓名：");
connectButton.setText("连 接");
connectButton.addActionListener(this);
disConnectButton.setText("断 开");
disConnectButton.addActionListener(this);
// 设置聊天内容不可编辑
chatContentTextArea.setEditable(false);
sendMsgButton.setText("发 送");
sendMsgButton.addActionListener(this);
msgTextField.setText("请输入聊天信息");
//panel1放置输入姓名和连接两个按钮
JPanel panel1 = new JPanel();
panel1.setLayout(new FlowLayout());
panel1.add(nameLabel);
panel1.add(nameTextField);
panel1.add(connectButton);
panel1.add(disConnectButton);
//用于放置聊天信息显示和聊天人员列表
JPanel panel2 = new JPanel();
panel2.setLayout(new FlowLayout());
JScrollPane pane1 = new JScrollPane(chatContentTextArea);
pane1.setBorder(new TitledBorder(BorderFactory.createEtchedBorder(
Color.white, new Color(134, 134, 134)), "聊天内容"));
panel2.add(pane1);
JScrollPane pane2 = new JScrollPane(peopleList);
pane2.setBorder(new TitledBorder(BorderFactory.createEtchedBorder(
Color.white, new Color(134, 134, 134)), "用户列表"));
panel2.add(pane2);
//用于放置发送信息区域
JPanel panel3 = new JPanel();
panel3.setLayout(new FlowLayout());
panel3.add(msglabel);
panel3.add(msgTextField);
panel3.add(sendMsgButton);
// 将组件添加到界面
this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(panel1, BorderLayout.NORTH);
this.getContentPane().add(panel2, BorderLayout.CENTER);
this.getContentPane().add(panel3, BorderLayout.SOUTH);
this.pack();
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 关闭聊天室客户端事件
*/
protected void processWindowEvent(WindowEvent e){
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
// 如果是关闭聊天室客户端，则断开连接
disconnect();
dispose();
System.exit(0);
}
}
/**
* 处理按钮事件
*/
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if (source == connectButton){
// 如果点击连接按钮
if (soc == null) {
try {
// 使用端口2525实例化一个本地套接字
soc = new Socket(InetAddress.getLocalHost(), Constants.SERVER_PORT);
// 在控制台打印实例化的结果
System.out.println(soc);
//将ps指向soc的输出流
ps = new PrintStream(soc.getOutputStream());
//定义一个字符缓冲存储发送信息
StringBuffer info = new StringBuffer(Constants.CONNECT_IDENTIFER).append(Constants.SEPERATOR);
//其中INFO为关键字让服务器识别为连接信息
//并将name和ip用"："分开，在服务器端将用一个
//StringTokenizer类来读取数据
String userinfo = nameTextField.getText() + Constants.SEPERATOR
+ InetAddress.getLocalHost().getHostAddress();
ps.println(info.append(userinfo));
ps.flush();
//将客户端线程实例化，并启动
listener = new ClentListener(this, nameTextField.getText(), soc);
listener.start();
} catch (IOException e) {
System.out.println("Error:" + e);
disconnect();
}
}
} else if (source == disConnectButton){
// 如果点击断开连接按钮
disconnect();
} else if (source == sendMsgButton) {
//如果点击发送按钮
if (soc != null) {
//定义并实例化一个字符缓冲存储发送的聊天信息
StringBuffer msg = new StringBuffer(Constants.MSG_IDENTIFER).append(Constants.SEPERATOR);
//用打印流发送聊天信息
ps.println(msg.append(msgTextField.getText()));
ps.flush();
}
}
}
/**
* 断开与服务器的连接
*/
public void disconnect(){
if (soc != null) {
try {
// 用打印流发送QUIT信息通知服务器断开此次通信
ps.println(Constants.QUIT_IDENTIFER);
ps.flush();
soc.close(); //关闭套接字
listener.toStop();
soc = null;
} catch (IOException e) {
System.out.println("Error:" + e);
}
}
}
public static void main(String[] args){
ChatClient client = new ChatClient();
client.setVisible(true);
}
/**
* 客户端线程类用来监听服务器传来的信息
*/
class ClentListener extends Thread {
//存储客户端连接后的name信息
String name = null;
//客户端接受服务器数据的输入流
BufferedReader br = null;
//实现从客户端发送数据到服务器的打印流
PrintStream ps = null;
//存储客户端的socket信息
Socket socket = null;
//存储当前运行的ChatClient实例
ChatClient parent = null;
boolean running = true;
//构造方法
public ClentListener(ChatClient p, String n, Socket s) {
//接受参数
parent = p;
name = n;
socket = s;
try {
//实例化两个数据流
br = new BufferedReader(new InputStreamReader(s
.getInputStream()));
ps = new PrintStream(s.getOutputStream());
} catch (IOException e) {
System.out.println("Error:" + e);
parent.disconnect();
}
}
// 停止侦听
public void toStop(){
this.running = false;
}
//线程运行方法
public void run(){
String msg = null;
while (running) {
msg = null;
try {
// 读取从服务器传来的信息
msg = br.readLine();
System.out.println("receive msg: " + msg);
} catch (IOException e) {
System.out.println("Error:" + e);
parent.disconnect();
}
// 如果从服务器传来的信息为空则断开此次连接
if (msg == null) {
parent.listener = null;
parent.soc = null;
parent.peopleList.removeAll();
running = false;
return;
}
//用StringTokenizer类来实现读取分段字符
StringTokenizer st = new StringTokenizer(msg, Constants.SEPERATOR);
//读取信息头即关键字用来识别是何种信息
String keyword = st.nextToken();
if (keyword.equals(Constants.PEOPLE_IDENTIFER)) {
//如果是PEOPLE则是服务器发来的客户连接信息
//主要用来刷新客户端的用户列表
parent.peopleList.removeAll();
//遍历st取得目前所连接的客户
while (st.hasMoreTokens()) {
String str = st.nextToken();
parent.peopleList.add(str);
}
} else if (keyword.equals(Constants.MSG_IDENTIFER)) {
//如果关键字是MSG则是服务器传来的聊天信息,
//主要用来刷新客户端聊天信息区将每个客户的聊天内容显示出来
String usr = st.nextToken();
parent.chatContentTextArea.append(usr);
parent.chatContentTextArea.append(st.nextToken("\0"));
parent.chatContentTextArea.append("\r\n");
} else if (keyword.equals(Constants.QUIT_IDENTIFER)) {
//如果关键字是QUIT则是服务器关闭的信息, 切断此次连接
System.out.println("Quit");
try {
running = false;
parent.listener = null;
parent.soc.close();
parent.soc = null;
} catch (IOException e) {
System.out.println("Error:" + e);
} finally {
parent.soc = null;
parent.peopleList.removeAll();
}
break;
}
}
//清除用户列表
parent.peopleList.removeAll();
}
}
}
/**
* 聊天室的服务器端程序，GUI界面
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.border.TitledBorder;
/**
* 聊天室的服务器端程序，GUI界面
*/
public class ChatServer extends JFrame {
// 状态栏标签
static JLabel statusBar = new JLabel();
// 显示客户端的连接信息的列表
static java.awt.List connectInfoList = new java.awt.List(10);
// 保存当前处理客户端请求的处理器线程
static Vector clientProcessors = new Vector(10);
// 当前的连接数
static int activeConnects = 0;
// 构造方法
public ChatServer() {
init();
try {
// 设置界面为系统默认外观
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(this);
} catch (Exception e) {
e.printStackTrace();
}
}
private void init(){
this.setTitle("聊天室服务器");
statusBar.setText("");
// 初始化菜单
JMenu fileMenu = new JMenu();
fileMenu.setText("文件");
JMenuItem exitMenuItem = new JMenuItem();
exitMenuItem.setText("退出");
exitMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
exitActionPerformed(e);
}
});
fileMenu.add(exitMenuItem);
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
this.setJMenuBar(menuBar);
// 将组件进行布局
JPanel jPanel1 = new JPanel();
jPanel1.setLayout(new BorderLayout());
JScrollPane pane = new JScrollPane(connectInfoList);
pane.setBorder(new TitledBorder(BorderFactory.createEtchedBorder(
Color.white, new Color(134, 134, 134)), "客户端连接信息"));
jPanel1.add(new JScrollPane(pane), BorderLayout.CENTER);
this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(statusBar, BorderLayout.SOUTH);
this.getContentPane().add(jPanel1, BorderLayout.CENTER);
this.pack();
}
/**
* 退出菜单项事件
* @param e
*/
public void exitActionPerformed(ActionEvent e){
// 向客户端发送断开连接信息
sendMsgToClients(new StringBuffer(Constants.QUIT_IDENTIFER));
// 关闭所有的连接
closeAll();
System.exit(0);
}
/**
* 处理窗口关闭事件
*/
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
exitActionPerformed(null);
}
}
/**
* 刷新聊天室，不断刷新clientProcessors，制造最新的用户列表
*/
public static void notifyRoomPeople(){
StringBuffer people = new StringBuffer(Constants.PEOPLE_IDENTIFER);
for (int i = 0; i < clientProcessors.size(); i++) {
ClientProcessor c = (ClientProcessor) clientProcessors.elementAt(i);
people.append(Constants.SEPERATOR).append(c.clientName);
}
// 用sendClients方法向客户端发送用户列表的信息
sendMsgToClients(people);
}
/**
* 向所有客户端群发消息
* @param msg
*/
public static synchronized void sendMsgToClients(StringBuffer msg) {
for (int i = 0; i < clientProcessors.size(); i++) {
ClientProcessor c = (ClientProcessor) clientProcessors.elementAt(i);
System.out.println("send msg: " + msg);
c.send(msg);
}
}
/**
* 关闭所有连接
*/
public static void closeAll(){
while (clientProcessors.size() > 0) {
ClientProcessor c = (ClientProcessor) clientProcessors.firstElement();
try {
// 关闭socket连接和处理线程
c.socket.close();
c.toStop();
} catch (IOException e) {
System.out.println("Error:" + e);
} finally {
clientProcessors.removeElement(c);
}
}
}
/**
* 判断客户端是否合法。
* 不允许同一客户端重复登陆，所谓同一客户端是指IP和名字都相同。
* @param newclient
* @return
*/
public static boolean checkClient(ClientProcessor newclient){
if (clientProcessors.contains(newclient)){
return false;
} else {
return true;
}
}
/**
* 断开某个连接，并且从连接列表中删除
* @param client
*/
public static void disconnect(ClientProcessor client){
disconnect(client, true);
}
/**
* 断开某个连接，根据要求决定是否从连接列表中删除
* @param client
* @param toRemoveFromList
*/
public static synchronized void disconnect(ClientProcessor client, boolean toRemoveFromList){
try {
//在服务器端程序的list框中显示断开信息
connectInfoList.add(client.clientIP + "断开连接");
ChatServer.activeConnects--; //将连接数减1
String constr = "目前有" + ChatServer.activeConnects + "客户相连";
statusBar.setText(constr);
//向客户发送断开连接信息
client.send(new StringBuffer(Constants.QUIT_IDENTIFER));
client.socket.close();
} catch (IOException e) {
System.out.println("Error:" + e);
} finally {
//从clients数组中删除此客户的相关socket等信息， 并停止线程。
if (toRemoveFromList) {
clientProcessors.removeElement(client);
client.toStop();
}
}
}
public static void main(String[] args) {
ChatServer chatServer1 = new ChatServer();
chatServer1.setVisible(true);
System.out.println("Server starting ...");
ServerSocket server = null;
try {
// 服务器端开始侦听
server = new ServerSocket(Constants.SERVER_PORT);
} catch (IOException e) {
System.out.println("Error:" + e);
System.exit(1);
}
while (true) {
// 如果当前客户端数小于MAX_CLIENT个时接受连接请求
if (clientProcessors.size() < Constants.MAX_CLIENT) {
Socket socket = null;
try {
// 收到客户端的请求
socket = server.accept();
if (socket != null) {
System.out.println(socket + "连接");
}
} catch (IOException e) {
System.out.println("Error:" + e);
}
// 定义并实例化一个ClientProcessor线程类，用于处理客户端的消息
ClientProcessor c = new ClientProcessor(socket);
if (checkClient(c)) {
// 添加到列表
clientProcessors.addElement(c);
// 如果客户端合法，则继续
int connum = ++ChatServer.activeConnects;
// 在状态栏里显示连接数
String constr = "目前有" + connum + "客户相连";
ChatServer.statusBar.setText(constr);
// 将客户socket信息写入list框
ChatServer.connectInfoList.add(c.clientIP + "连接");
c.start();
// 通知所有客户端用户列表发生变化
notifyRoomPeople();
} else {
//如果客户端不合法
c.ps.println("不允许重复登陆");
disconnect(c, false);
}
} else {
//如果客户端超过了MAX_CLIENT个，则等待一段时间再尝试接受请求
try {
Thread.sleep(200);
} catch (InterruptedException e) {
}
}
}
}
}
/**
* 处理客户端发送的请求的线程
*/
class ClientProcessor extends Thread {
//存储一个连接客户端的socket信息
Socket socket;
//存储客户端的连接姓名
String clientName;
//存储客户端的ip信息
String clientIP;
//用来实现接受从客户端发来的数据流
BufferedReader br;
//用来实现向客户端发送信息的打印流
PrintStream ps;
boolean running = true;
/**
* 构造方法
* @param s
*/
public ClientProcessor(Socket s) {
socket = s;
try {
// 初始化输入输出流
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
ps = new PrintStream(socket.getOutputStream());
// 读取收到的信息，第一条信息是客户端的名字、IP信息
String clientInfo = br.readLine();
// 读取信息，根据消息分隔符解析消息
StringTokenizer stinfo = new StringTokenizer(clientInfo, Constants.SEPERATOR);
String head = stinfo.nextToken();
if (head.equals(Constants.CONNECT_IDENTIFER)){
if (stinfo.hasMoreTokens()){
//关键字后的第二段数据是客户名信息
clientName = stinfo.nextToken();
}
if (stinfo.hasMoreTokens()){
//关键字后的第三段数据是客户ip信息
clientIP = stinfo.nextToken();
}
System.out.println(head); //在控制台打印头信息
}
} catch (IOException e) {
System.out.println("Error:" + e);
}
}
/**
* 向客户端发送消息
* @param msg
*/
public void send(StringBuffer msg) {
ps.println(msg);
ps.flush();
}
//线程运行方法
public void run() {
while (running) {
String line = null;
try {
//读取客户端发来的数据流
line = br.readLine();
} catch (IOException e) {
System.out.println("Error" + e);
ChatServer.disconnect(this);
ChatServer.notifyRoomPeople();
return;
}
//客户已离开
if (line == null){
ChatServer.disconnect(this);
ChatServer.notifyRoomPeople();
return;
}
StringTokenizer st = new StringTokenizer(line, Constants.SEPERATOR);
String keyword = st.nextToken();
// 如果关键字是MSG则是客户端发来的聊天信息
if (keyword.equals(Constants.MSG_IDENTIFER)){
StringBuffer msg = new StringBuffer(Constants.MSG_IDENTIFER).append(Constants.SEPERATOR);
msg.append(clientName);
msg.append(st.nextToken("\0"));
// 再将某个客户发来的聊天信息发送到每个连接客户的聊天栏中
ChatServer.sendMsgToClients(msg);
} else if (keyword.equals(Constants.QUIT_IDENTIFER)) {
// 如果关键字是QUIT则是客户端发来断开连接的信息
// 服务器断开与这个客户的连接
ChatServer.disconnect(this);
// 继续监听聊天室并刷新其他客户的聊天人名list
ChatServer.notifyRoomPeople();
running = false;
}
}
}
public void toStop(){
running = false;
}
// 覆盖Object类的equals方法
public boolean equals(Object obj){
if (obj instanceof ClientProcessor){
ClientProcessor obj1 = (ClientProcessor)obj;
if (obj1.clientIP.equals(this.clientIP) &&
(obj1.clientName.equals(this.clientName))){
return true;
}
}
return false;
}
// 覆盖Object类的hashCode方法
public int hashCode(){
return (this.clientIP + Constants.SEPERATOR + this.clientName).hashCode();
}
}
/**
* 定义聊天室程序中用到的常量
*/
public class Constants {
// 服务器的端口号
public static final int SERVER_PORT = 2525;
public static final int MAX_CLIENT = 10;
// 消息标识符与消息体之间的分隔符
public static final String SEPERATOR = "：";
// 消息信息的标识符
public static final String MSG_IDENTIFER = "MSG";
// 用户列表信息的标识符
public static final String PEOPLE_IDENTIFER = "PEOPLE";
// 连接服务器信息的标识符
public static final String CONNECT_IDENTIFER = "INFO";
// 退出信息标识符
public static final String QUIT_IDENTIFER = "QUIT";
}
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