java基于C/S模式实现聊天程序（服务器）

package server;

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

import javax.swing.*;

public class Server extends JFrame {

 JTextArea textShow;
 JButton start;
 Vector socketsss = new Vector();//这里用到了变长对象数组，用来存储来自客户端的socket对象
 ServerSocket server = null;
 Socket clients;

 Server() { // 服务器的构造函数，并且初始化
 init();
 setVisible(true);
 setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
 setBounds(450, 150, 340, 455);
 setTitle("好好学习天天向上聊天室服务器");
 setResizable(false);
 }

 void init() { // 设置布局和事件监视器
 setLayout(new FlowLayout());
 getContentPane().setBackground(new Color(20, 85, 237));
 textShow = new JTextArea(21, 29);
 textShow.setBackground(new Color(45, 210, 209));
 start = new JButton("       启动服务器       ");
 start.setBackground(new Color(236, 134, 21));
 add(start);
 add(new JScrollPane(textShow));
 textShow.setEditable(false);
 start.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {  //在这里启动监听的线程
  Listen listen = new Listen();
  Thread go = new Thread(listen);
  go.start();
  }
 });

 addWindowListener(new WindowAdapter() { // 响应关闭按钮功能
  public void windowClosing(WindowEvent e) {
  int option = JOptionPane
   .showConfirmDialog(null, "亲爱的你真的要离开聊天室么？",
    " 好好学习天天向上聊天室", JOptionPane.YES_NO_OPTION,
    JOptionPane.QUESTION_MESSAGE);
  if (option == JOptionPane.YES_OPTION)
   System.exit(0);

  }
 });

 } // init()结束

 class ServerThread extends Thread { // 服务器消息处理的线程
 Socket socket;
 DataOutputStream out = null;
 DataInputStream in = null;
 String s = null;
 Vector sockets = new Vector();
 int j = 0;

 ServerThread(Socket t, Vector socketss) {
  socket = t;
  sockets = socketss;
  try { 
  in = new DataInputStream(socket.getInputStream());
  } catch (IOException e) {
  }
 }

 public void run() {
  while (true) {
  try {
   String r = in.readUTF();// 堵塞状态，除非读取到信息
   for (int j = 0; j < sockets.size(); j++) {
   out = new DataOutputStream(
    ((Socket) sockets.get(j)).getOutputStream()); // 对于每个数组内的socket对象都建立输出流
   out.writeUTF(r);
   }
  } catch (IOException e) {
   textShow.append("有一个逗比离开了\n");
   return;
  }
  }
 }
 }

 class Listen implements Runnable { // 服务器监听线程
 ServerSocket server;
 Socket clients;

 public void run() {
  while (true) {
  try {
   server = new ServerSocket(8888);
   textShow.append(new java.text.SimpleDateFormat(
    "yy-MM-dd HH:mm:ss").format(new Date())
    + "服务器已开启\n");
  } catch (IOException e1) {
   textShow.append("正在监听\n"); // ServerSocket对象不能重复创建
  }
  try {
   textShow.append(new java.text.SimpleDateFormat(
    "yy-MM-dd HH:mm:ss").format(new Date())
    + " 等待用户连接......\n");

   clients = server.accept();
   socketsss.add(clients);
   ServerThread handlers = new ServerThread(clients, socketsss);
   handlers.start(); // 为每个用户创建单独的消息处理线程
   textShow.append(new java.text.SimpleDateFormat(
    "yy-MM-dd HH:mm:ss").format(new Date())
    + "有用户连接,用户的地址:" + clients.getInetAddress() + "\n");
  } catch (IOException e1) {
   textShow.append(new java.text.SimpleDateFormat(
    "yy-MM-dd HH:mm:ss").format(new Date())
    + "正在等待逗比来临......\n");
  }
  }
 }
 }

 public static void main(String args[]) {
 Server server = new Server();
 }
}