import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import com.jero.jframe.ChatSocketJFrame;
//創建服務端
public class ChatServerSocket{
  //構造初始化方法
  public ChatServerSocket(String name,int port) throws IOException{
    //創建Socket服務連接對象  
      ServerSocket serverSocket = new ServerSocket(port);
    //等待客戶端連接
      Socket client = serverSocket.accept();
    //初始化聊天界面  
      try {
        new ChatSocketJFrame(name,client);
      } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    //關閉流
      serverSocket.close();
  }
  public static void main(String[] args) throws Exception{
    new ChatServerSocket("服務端",8001);//啟動服務端，指定網名和端口
  }

}

package com.jero.jframe;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;

import com.jero.socket.ChatServerSocket;

import javax.swing.JTextPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JTextArea;

public class ChatSocketJFrame extends JFrame implements ActionListener {
  private Socket socket;
  private String name;
  private JButton BT_SEND,BT_LEAVE,BT_LOGIN;
  private JTextArea textArea;
  private JPanel contentPane;
  private JTextField textField;
  private PrintWriter cout;
  /**
   * Launch the application.
   * @throws Exception 
   * @throws IOException 
   * @throws UnknownHostException 
   */
  public static void main(String[] args) throws UnknownHostException, IOException, Exception {
    //實例化界面以及客戶端
    new ChatSocketJFrame("客戶端","127.0.0.1",8001);
  }

  /**
   * Create the frame.
   */
  public ChatSocketJFrame(String name, Socket socket)throws Exception, IOException {
    //聊天室界面
    super("聊天室"+name+" "+InetAddress.getLocalHost()+" "+socket.getPort());
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 733, 519);
    this.textArea = new JTextArea();
    this.textArea.setEditable(false);
    this.getContentPane().add(new JScrollPane(this.textArea));
    JPanel panel = new JPanel();
    this.getContentPane().add(panel, "South");
    this.textField = new JTextField(16);
    panel.add(this.textField);
    BT_SEND = new JButton("發送");
    panel.add(BT_SEND);
    BT_SEND.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        System.out.println("按鈕已點擊");
        cout.println(name+"說: "+textField.getText()+"\n");
        textArea.append("我說: "+textField.getText()+"\n");
        textField.setText("");
      }
    });
    BT_LEAVE = new JButton("離線");
    panel.add(BT_LEAVE);
    BT_LEAVE.addActionListener(new ActionListener() {

      @Override
      public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
        textArea.append("我離線");
        cout.println(name+"離線\n"+"bye");
        BT_LEAVE.setEnabled(false);
        BT_SEND.setEnabled(false);
      }
    });
    this.setVisible(true);
    //開始創建通信
    this.socket = socket;
    this.name = name;
    //獲得Socket的輸出流并立即刷新
    this.cout = new PrintWriter(socket.getOutputStream(),true);
    //把網名傳給對方
    this.cout.println(name);
    //獲得Socket對象的輸入流，創建字符輸入流
    BufferedReader buff = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    //接受對方的網名
    String aline = buff.readLine();
    //顯示對方發送的內容
    textArea.append("連接"+aline+"成功！！\n");
    aline = buff.readLine();
    //如果內容不為空并且對方不離線，則相互傳送消息
    while(aline!=null&&!aline.equals("bye")){

      textArea.append(aline+"\r\n");
      aline = buff.readLine();
    }
    //當對方離線時，關閉所有的流
    buff.close();
    cout.close();
    socket.close();
    //把按鈕設置為不可操作
    BT_SEND.setEnabled(false);
    BT_LEAVE.setEnabled(false);
  }


  /**
   * @wbp.parser.constructor
   */
  public ChatSocketJFrame(String name,String host,int port) throws UnknownHostException, IOException, Exception{
    //創建客戶端
    this(name,new Socket(host,port));
  }

  @Override
  public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    //可以把動作監聽寫進此函數，這個就不演示了
  }
}