java socket客户端和服务端实例

以下代码参考马士兵的聊天项目，先运行ChatServer.java实现端口监听，然后再运行ChatClient.java

客户端实例

ChatClient.java

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

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();
}

public void launchFrame() {
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();

tRecv.start();
}

public void connect() {
try {
s = new Socket("localhost", 8888);
dos = new DataOutputStream(s.getOutputStream());
dis = new DataInputStream(s.getInputStream());
System.out.println("connected!");
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();
}

/*
 * try { bConnected = false; tRecv.join(); } catch(InterruptedException
 * e) { e.printStackTrace(); } finally { 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();
// taContent.setText(str);
tfTxt.setText("");

try {
// System.out.println(s);
dos.writeUTF(str);
dos.flush();
// dos.close();
} catch (IOException e1) {
e1.printStackTrace();
}

}

}

private class RecvThread implements Runnable {

public void run() {
try {
while (bConnected) {
String str = dis.readUTF();
// System.out.println(str);
taContent.setText(taContent.getText() + str + '\n');
}
} catch (SocketException e) {
System.out.println("退出了，bye!");
} catch (EOFException e) {
System.out.println("推出了，bye - bye!");
} catch (IOException e) {
e.printStackTrace();
}

}

}
}

socket服务端代码
ChatServer.java

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;
} 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);
// dis.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
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！");
// e.printStackTrace();
}
}

public void run() {
try {
while (bConnected) {
String str = dis.readUTF();
System.out.println(str);
for (int i = 0; i < clients.size(); i++) {
Client c = clients.get(i);
c.send(str);
// System.out.println(" a string send !");
}
/*
 * for(Iterator<Client> it = clients.iterator();
 * it.hasNext(); ) { Client c = it.next(); c.send(str); }
 */
/*
 * Iterator<Client> it = clients.iterator();
 * while(it.hasNext()) { Client c = it.next(); 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();
// s = null;
}

} catch (IOException e1) {
e1.printStackTrace();
}

}
}

}
}