Java基于socket实现的客户端和服务端通信功能完整实例

package socketDemo;
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();
      }
    }
  }
}

package socketDemo;
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();
        }
      }
    }
  }
}