服务器端程序：
import java.io.*;
import java.net.*;
import java.util.*; public class ChatServer {
boolean started = false;
ServerSocket ss = null;
List<Client> clients = new ArrayList<Client>(); public static void main(String[] args) {
new ChatServer().start();
} public void start() {
try {
ss = new ServerSocket(8888);
started = true;
System.out.println("端口已开启,占用8888端口号....");
} catch (BindException e) {
System.out.println("端口使用中....");
System.out.println("请关掉相关程序并重新运行服务器！");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
} try {
while (started) {
Socket s = ss.accept();
Client c = new Client(s);
System.out.println("a client connected!");
new Thread(c).start();
clients.add(c);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} class Client implements Runnable {
private Socket s;
private DataInputStream dis = null;
private DataOutputStream dos = null;
private boolean bConnected = false; public Client(Socket s) {
this.s = s;
try {
dis = new DataInputStream(s.getInputStream());
dos = new DataOutputStream(s.getOutputStream());
bConnected = true;
} catch (IOException e) {
e.printStackTrace();
}
} public void send(String str) {
try {
dos.writeUTF(str);
} catch (IOException e) {
clients.remove(this);
System.out.println("对方退出了！我从List里面去掉了！");
}
} public void run() {
try {
while (bConnected) {
String str = dis.readUTF();
System.out.println("------------来自本地服务器:" + str);
for (int i = 0; i < clients.size(); i++) {
Client c = clients.get(i);
c.send(str);
}
}
} catch (EOFException e) {
System.out.println("Client closed!");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (dis != null)
dis.close();
if (dos != null)
dos.close();
if (s != null) {
s.close();
} } catch (IOException e1) {
e1.printStackTrace();
} }
}
}
}
客户端程序：
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*; /**
* @author Michael Huang
*
*/
public class ChatClient extends Frame {
Socket s = null;
DataOutputStream dos = null;
DataInputStream dis = null;
private boolean bConnected = false; TextField tfTxt = new TextField();
TextArea taContent = new TextArea(); Thread tRecv = new Thread(new RecvThread()); public static void main(String[] args) {
new ChatClient().launchFrame(8888);
} public void launchFrame(int port) {
setLocation(400, 300);
this.setSize(300, 300);
add(tfTxt, BorderLayout.SOUTH);
add(taContent, BorderLayout.NORTH);
pack();
this.addWindowListener(new WindowAdapter() { @Override
public void windowClosing(WindowEvent arg0) {
disconnect();
System.exit(0);
} });
tfTxt.addActionListener(new TFListener());
setVisible(true);
connect(port); tRecv.start();
} public void connect(int port) {
try {
s = new Socket("127.0.0.1", port);
dos = new DataOutputStream(s.getOutputStream());
dis = new DataInputStream(s.getInputStream());
System.out.println("~~~~~~~~连接成功~~~~~~~~!");
bConnected = true;
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} } public void disconnect() {
try {
dos.close();
dis.close();
s.close();
} catch (IOException e) {
e.printStackTrace();
} } private class TFListener implements ActionListener { public void actionPerformed(ActionEvent e) {
String str = tfTxt.getText().trim();
tfTxt.setText(""); try {
dos.writeUTF(str);
dos.flush();
} catch (IOException e1) {
e1.printStackTrace();
} } } private class RecvThread implements Runnable { public void run() {
try {
while (bConnected) {
String str = dis.readUTF();
taContent.setText(taContent.getText() + str + '\n');
}
} catch (SocketException e) {
System.out.println("退出了，bye!");
} catch (EOFException e) {
System.out.println("退出了，bye!");
} catch (IOException e) {
e.printStackTrace();
} } }
}