java局域网聊天小程序

本文实例为大家分享了java局域网聊天程序的具体代码，供大家参考，具体内容如下

有服务器端 和客户端两个界面，运行需要加上自己的ip地址，端口可以随意，但是客户端端口，和服务器端口要一样，然后就可以几个人一块聊天了

简单贴几个代码吧  

client.java  客户端代码

package chat;
 
import java.awt.borderlayout;//布置容器的边框布局
import java.awt.color;
import java.awt.container;
import java.awt.gridlayout;//布局处理器
import java.awt.toolkit;//抽象超类
import java.awt.event.actionevent;//指示发生了组件定义的动作的语义事件
import java.awt.event.actionlistener;//用于接收操作事件的侦听器接口
import java.awt.event.mouseevent;//指示组件中发生鼠标动作的事件
import java.awt.event.mouselistener;//鼠标事件的侦听器接口
import java.awt.event.windowadapter;//接收窗口事件的抽象适配器类。此类中的方法为空。此类存在的目的是方便创建侦听器对象
import java.awt.event.windowevent;//指示窗口状态改变的低级别事件
import java.io.bufferedreader;//提供通用的缓冲方式文本读取
import java.io.ioexception;//输入输出异常
import java.io.inputstreamreader;//字节流通向字符流的桥梁
import java.io.printwriter;//向文本输出流打印对象的格式化表示形式
import java.net.socket;//套接字，网络上的两个程序通过一个双向的通信连接实现数据交换的通信
import java.util.hashmap;// hashmap 是 map 接口的常用实现类
import java.util.map;//存数据，将键映射到值的对象
import java.util.stringtokenizer;//允许应用程序将字符串分解为标记
 
import javax.swing.borderfactory;//创建一个浮雕式的边框
import javax.swing.defaultlistmodel;//列表模型
import javax.swing.jbutton;//按钮
import javax.swing.jframe;//窗口
import javax.swing.jlabel;//标签
import javax.swing.jlist;//列表
import javax.swing.joptionpane;//对话框
import javax.swing.jpanel;
import javax.swing.jscrollpane;//视图
import javax.swing.jsplitpane;//分隔
import javax.swing.jtextarea;//多行文本
import javax.swing.jtextfield;//文本
import javax.swing.border.emptyborder;//一个占用空间但不执行绘制的空透明边框
import javax.swing.border.titledborder;//该类实现在指定位置以指定对齐方式显示字符串标题的任意边框
 
import oldchat.chatframe;
 
 
public class client
{
 
 private jframe frame;
 private jlist userlist;
 private jtextarea textarea;
 private jtextfield textfield;
 private jtextfield txt_port;
 private jtextfield txt_hostip;
 private jtextfield txt_name;
 private jbutton btn_start;
 private jbutton btn_stop;
 private jbutton btn_send;
 private jpanel northpanel;
 private jpanel southpanel;
 private jscrollpane rightscroll;
 private jscrollpane leftscroll;
 private jsplitpane centersplit;
 
 private defaultlistmodel listmodel;
 private boolean isconnected = false;
 
 private socket socket;//创建套接字
 private printwriter writer;
 private bufferedreader reader;
 private messagethread messagethread;// 负责接收消息的线程
 private map<string, user> onlineusers = new hashmap<string, user>();// 所有在线用户
 
 // 主方法,程序入口
 public static void main(string[] args) 
 {
 new client();
 }
 
 // 执行发送
 public void send() 
 {
 if (!isconnected) 
 {
  joptionpane.showmessagedialog(frame, "还没有连接服务器，无法发送消息！", "错误",
   joptionpane.error_message);
  return;
 }
 string message = textfield.gettext().trim();
 if (message == null || message.equals("")) 
 {
  joptionpane.showmessagedialog(frame, "消息不能为空！", "错误",
   joptionpane.error_message);
  return;
 }
 sendmessage(frame.gettitle() + "@" + "all" + "@" + message);
 textfield.settext(null);
 }
 
 // 构造方法
 public client() 
 {
 textarea = new jtextarea();
 textarea.seteditable(false);
 textarea.setforeground(color.blue);
 textfield = new jtextfield();
 txt_port = new jtextfield("6666");
 txt_hostip = new jtextfield();
 txt_name = new jtextfield();
 btn_start = new jbutton("连接");
 btn_stop = new jbutton("断开");
 btn_send = new jbutton("发送");
 listmodel = new defaultlistmodel();
 userlist = new jlist(listmodel);
 
 northpanel = new jpanel();
 northpanel.setlayout(new gridlayout(1, 7));
 northpanel.add(new jlabel("端口"));
 northpanel.add(txt_port);
 northpanel.add(new jlabel("服务器ip"));
 northpanel.add(txt_hostip);
 northpanel.add(new jlabel("姓名"));
 northpanel.add(txt_name);
 northpanel.add(btn_start);
 northpanel.add(btn_stop);
 northpanel.setborder(new titledborder("连接信息"));
 
 rightscroll = new jscrollpane(textarea);
 rightscroll.setborder(new titledborder("群聊消息显示区"));
 leftscroll = new jscrollpane(userlist);
 leftscroll.setborder(new titledborder("在线用户(双击私聊)"));
 southpanel = new jpanel(new borderlayout());
 southpanel.add(textfield, "center");
 southpanel.add(btn_send, "east");
 southpanel.setborder(new titledborder("写消息"));
 
 centersplit = new jsplitpane(jsplitpane.horizontal_split, leftscroll,
  rightscroll);
 centersplit.setdividerlocation(100);
 
 frame = new jframe("客户端");
 // 更改jframe的图标：
 //frame.seticonimage(toolkit.getdefaulttoolkit().createimage(client.class.getresource("qq.jpg")));
 frame.setlayout(new borderlayout());
 frame.add(northpanel, "north");
 frame.add(centersplit, "center");
 frame.add(southpanel, "south");
 frame.setsize(600, 400);
 int screen_width = toolkit.getdefaulttoolkit().getscreensize().width;
 int screen_height = toolkit.getdefaulttoolkit().getscreensize().height;
 frame.setlocation((screen_width - frame.getwidth()) / 2,
  (screen_height - frame.getheight()) / 2);
 frame.setvisible(true);
 
 // 写消息的文本框中按回车键时事件
 textfield.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent arg0) 
  {
  send();
  }
 });
 
 // 单击发送按钮时事件
 btn_send.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  send();
  }
 });
 
 // 单击连接按钮时事件
 btn_start.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  int port;
  if (isconnected) {
   joptionpane.showmessagedialog(frame, "已处于连接上状态，不要重复连接!",
    "错误", joptionpane.error_message);
   return;
  }
  try {
   try {
   port = integer.parseint(txt_port.gettext().trim());
   } catch (numberformatexception e2) {
   throw new exception("端口号不符合要求!端口为整数!");
   }
   string hostip = txt_hostip.gettext().trim();
   string name = txt_name.gettext().trim();
   if (name.equals("") || hostip.equals("")) {
   throw new exception("姓名、服务器ip不能为空!");
   }
   boolean flag = connectserver(port, hostip, name);
   if (flag == false) {
   throw new exception("与服务器连接失败!");
   }
   frame.settitle(name);
   joptionpane.showmessagedialog(frame, "成功连接!");
  } catch (exception exc) {
   joptionpane.showmessagedialog(frame, exc.getmessage(),
    "错误", joptionpane.error_message);
  }
  }
 });
//双击聊天（私聊） 
 userlist.addmouselistener(new mouselistener() 
 {
  
  public void mousereleased(mouseevent e) {}
  public void mousepressed(mouseevent e) {}
  public void mouseexited(mouseevent e) {}
  public void mouseentered(mouseevent e) {}
  public void mouseclicked(mouseevent e) 
  {
  if(e.getclickcount()==2) 
  {
   user user=onlineusers.get(userlist.getselectedvalue());
    chatframe.main(user.getip());;
  } 
  }
 });
 
 // 单击断开按钮时事件
 btn_stop.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  if (!isconnected) {
   joptionpane.showmessagedialog(frame, "已处于断开状态，不要重复断开!",
    "错误", joptionpane.error_message);
   return;
  }
  try {
   boolean flag = closeconnection();// 断开连接
   if (flag == false) {
   throw new exception("断开连接发生异常！");
   }
   joptionpane.showmessagedialog(frame, "成功断开!");
  } catch (exception exc) {
   joptionpane.showmessagedialog(frame, exc.getmessage(),
    "错误", joptionpane.error_message);
  }
  }
 });
 
 // 关闭窗口时事件
 frame.addwindowlistener(new windowadapter() 
 {
  public void windowclosing(windowevent e) 
  {
  if (isconnected) {
   closeconnection();// 关闭连接
  }
  system.exit(0);// 退出程序
  }
 });
 }
 
 /**
 * 连接服务器
 * 
 * @param port
 * @param hostip
 * @param name
 */
 public boolean connectserver(int port, string hostip, string name) 
 {
 // 连接服务器
 try {
  socket = new socket(hostip, port);// 根据端口号和服务器ip建立连接
  writer = new printwriter(socket.getoutputstream());
  reader = new bufferedreader(new inputstreamreader(socket
   .getinputstream()));
  // 发送客户端用户基本信息(用户名和ip地址)
  sendmessage(name + "@" + socket.getlocaladdress().tostring());
  // 开启接收消息的线程
  messagethread = new messagethread(reader, textarea);
  messagethread.start();
  isconnected = true;// 已经连接上了
  return true;
 } catch (exception e) {
  textarea.append("与端口号为：" + port + "  ip地址为：" + hostip
   + "  的服务器连接失败!" + "\r\n");
  isconnected = false;// 未连接上
  return false;
 }
 }
 
 /**
 * 发送消息
 * 
 * @param message
 */
 public void sendmessage(string message) 
 {
 writer.println(message);
 writer.flush();
 }
 
 /**
 * 客户端主动关闭连接
 */
 @suppresswarnings("deprecation")
 public synchronized boolean closeconnection() 
 {
 try {
  sendmessage("close");// 发送断开连接命令给服务器
  messagethread.stop();// 停止接受消息线程
  // 释放资源
  if (reader != null) {
  reader.close();
  }
  if (writer != null) {
  writer.close();
  }
  if (socket != null) {
  socket.close();
  }
  isconnected = false;
  return true;
 } catch (ioexception e1) {
  e1.printstacktrace();
  isconnected = true;
  return false;
 }
 }
 
 // 不断接收消息的线程
 class messagethread extends thread {
 private bufferedreader reader;
 private jtextarea textarea;
 
 // 接收消息线程的构造方法
 public messagethread(bufferedreader reader, jtextarea textarea) 
 {
  this.reader = reader;
  this.textarea = textarea;
 }
 
 // 被动的关闭连接
 public synchronized void closecon() throws exception 
 {
  // 清空用户列表
  listmodel.removeallelements();
  // 被动的关闭连接释放资源
  if (reader != null) {
  reader.close();
  }
  if (writer != null) {
  writer.close();
  }
  if (socket != null) {
  socket.close();
  }
  isconnected = false;// 修改状态为断开
 }
 
 public void run() {
  string message = "";
  while (true) {
  try {
   message = reader.readline();
   stringtokenizer stringtokenizer = new stringtokenizer(message, "/@");
   string command = stringtokenizer.nexttoken();// 命令
   if (command.equals("close"))// 服务器已关闭命令
   {
   textarea.append("服务器已关闭!\r\n");
   closecon();// 被动的关闭连接
   return;// 结束线程
   } else if (command.equals("add")) {// 有用户上线更新在线列表
   string username = "";
   string userip = "";
   if ((username = stringtokenizer.nexttoken()) != null
    && (userip = stringtokenizer.nexttoken()) != null) 
   {
    user user = new user(username, userip);
    onlineusers.put(username, user);
    listmodel.addelement(username);
   }
   } else if (command.equals("delete")) {// 有用户下线更新在线列表
   string username = stringtokenizer.nexttoken();
   user user = (user) onlineusers.get(username);
   onlineusers.remove(user);
   listmodel.removeelement(username);
   } else if (command.equals("userlist")) {// 加载在线用户列表
   int size = integer
    .parseint(stringtokenizer.nexttoken());
   string username = null;
   string userip = null;
   for (int i = 0; i < size; i++) {
    username = stringtokenizer.nexttoken();
    userip = stringtokenizer.nexttoken();
    user user = new user(username, userip);
    onlineusers.put(username, user);
    listmodel.addelement(username);
   }
   } else if (command.equals("max")) {// 人数已达上限
   textarea.append(stringtokenizer.nexttoken()
    + stringtokenizer.nexttoken() + "\r\n");
   closecon();// 被动的关闭连接
   joptionpane.showmessagedialog(frame, "服务器缓冲区已满！", "错误",
    joptionpane.error_message);
   return;// 结束线程
   } else {// 普通消息
   textarea.append(message + "\r\n");
   }
  } catch (ioexception e) {
   e.printstacktrace();
  } catch (exception e) {
   e.printstacktrace();
  }
  }
 }
 }
 
}

server.java

package chat;
 
import java.awt.borderlayout;
import java.awt.color;
import java.awt.gridlayout;
import java.awt.toolkit;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.windowadapter;
import java.awt.event.windowevent;
import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.net.bindexception;
import java.net.serversocket;
import java.net.socket;
import java.util.arraylist;
import java.util.stringtokenizer;
 
import javax.swing.defaultlistmodel;
import javax.swing.jbutton;
import javax.swing.jframe;
import javax.swing.jlabel;
import javax.swing.jlist;
import javax.swing.joptionpane;
import javax.swing.jpanel;
import javax.swing.jscrollpane;
import javax.swing.jsplitpane;
import javax.swing.jtextarea;
import javax.swing.jtextfield;
import javax.swing.border.titledborder;
 
public class server 
{
 
 private jframe frame;
 private jtextarea contentarea;
 private jtextfield txt_message;
 private jtextfield txt_max;
 private jtextfield txt_port;
 private jbutton btn_start;
 private jbutton btn_stop;
 private jbutton btn_send;
 private jpanel northpanel;
 private jpanel southpanel;
 private jscrollpane rightpanel;
 private jscrollpane leftpanel;
 private jsplitpane centersplit;
 private jlist userlist;
 private defaultlistmodel listmodel;
 
 private serversocket serversocket;
 private serverthread serverthread;
 private arraylist<clientthread> clients;
 
 private boolean isstart = false;
 
 // 主方法,程序执行入口
 public static void main(string[] args) 
 {
 new server();
 }
 
 // 执行消息发送
 public void send() 
 {
 if (!isstart) 
 {
  joptionpane.showmessagedialog(frame, "服务器还未启动,不能发送消息！", "错误",
   joptionpane.error_message);
  return;
 }
 if (clients.size() == 0) 
 {
  joptionpane.showmessagedialog(frame, "没有用户在线,不能发送消息！", "错误",
   joptionpane.error_message);
  return;
 }
 string message = txt_message.gettext().trim();
 if (message == null || message.equals("")) 
 {
  joptionpane.showmessagedialog(frame, "消息不能为空！", "错误",
   joptionpane.error_message);
  return;
 }
 sendservermessage(message);// 群发服务器消息
 contentarea.append("服务器说：" + txt_message.gettext() + "\r\n");
 txt_message.settext(null);
 }
 
 // 构造放法
 public server() 
 {
 frame = new jframe("服务器");
 // 更改jframe的图标：
 //frame.seticonimage(toolkit.getdefaulttoolkit().createimage(client.class.getresource("qq.png")));
 //frame.seticonimage(toolkit.getdefaulttoolkit().createimage(server.class.getresource("qq.jpg")));
 contentarea = new jtextarea();
 contentarea.seteditable(false);
 contentarea.setforeground(color.blue);
 txt_message = new jtextfield();
 txt_max = new jtextfield("30");
 txt_port = new jtextfield("6666");
 btn_start = new jbutton("启动");
 btn_stop = new jbutton("停止");
 btn_send = new jbutton("发送");
 btn_stop.setenabled(false);
 listmodel = new defaultlistmodel();
 userlist = new jlist(listmodel);
 
 southpanel = new jpanel(new borderlayout());
 southpanel.setborder(new titledborder("写消息"));
 southpanel.add(txt_message, "center");
 southpanel.add(btn_send, "east");
 leftpanel = new jscrollpane(userlist);
 leftpanel.setborder(new titledborder("在线用户"));
 
 rightpanel = new jscrollpane(contentarea);
 rightpanel.setborder(new titledborder("群聊消息显示区"));
 
 centersplit = new jsplitpane(jsplitpane.horizontal_split, leftpanel,
  rightpanel);
 centersplit.setdividerlocation(100);
 northpanel = new jpanel();
 northpanel.setlayout(new gridlayout(1, 6));
 northpanel.add(new jlabel("人数上限"));
 northpanel.add(txt_max);
 northpanel.add(new jlabel("端口"));
 northpanel.add(txt_port);
 northpanel.add(btn_start);
 northpanel.add(btn_stop);
 northpanel.setborder(new titledborder("配置信息"));
 
 frame.setlayout(new borderlayout());
 frame.add(northpanel, "north");
 frame.add(centersplit, "center");
 frame.add(southpanel, "south");
 frame.setsize(600, 400);
 //frame.setsize(toolkit.getdefaulttoolkit().getscreensize());//设置全屏
 int screen_width = toolkit.getdefaulttoolkit().getscreensize().width;
 int screen_height = toolkit.getdefaulttoolkit().getscreensize().height;
 frame.setlocation((screen_width - frame.getwidth()) / 2,
  (screen_height - frame.getheight()) / 2);
 frame.setvisible(true);
 
 // 关闭窗口时事件
 frame.addwindowlistener(new windowadapter() 
 {
  public void windowclosing(windowevent e) 
  {
  if (isstart) {
   closeserver();// 关闭服务器
  }
  system.exit(0);// 退出程序
  }
 });
 
 // 文本框按回车键时事件
 txt_message.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  send();
  }
 });
 
 // 单击发送按钮时事件
 btn_send.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent arg0) 
  {
  send();
  }
 });
 
 // 单击启动服务器按钮时事件
 btn_start.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  if (isstart) {
   joptionpane.showmessagedialog(frame, "服务器已处于启动状态，不要重复启动！",
    "错误", joptionpane.error_message);
   return;
  }
  int max;
  int port;
  try {
   try {
   max = integer.parseint(txt_max.gettext());
   } catch (exception e1) {
   throw new exception("人数上限为正整数！");
   }
   if (max <= 0) {
   throw new exception("人数上限为正整数！");
   }
   try {
   port = integer.parseint(txt_port.gettext());
   } catch (exception e1) {
   throw new exception("端口号为正整数！");
   }
   if (port <= 0) {
   throw new exception("端口号 为正整数！");
   }
   serverstart(max, port);
   contentarea.append("服务器已成功启动!人数上限：" + max + ",端口：" + port
    + "\r\n");
   joptionpane.showmessagedialog(frame, "服务器成功启动!");
   btn_start.setenabled(false);
   txt_max.setenabled(false);
   txt_port.setenabled(false);
   btn_stop.setenabled(true);
  } catch (exception exc) {
   joptionpane.showmessagedialog(frame, exc.getmessage(),
    "错误", joptionpane.error_message);
  }
  }
 });
 
 // 单击停止服务器按钮时事件
 btn_stop.addactionlistener(new actionlistener() 
 {
  public void actionperformed(actionevent e) 
  {
  if (!isstart) {
   joptionpane.showmessagedialog(frame, "服务器还未启动，无需停止！", "错误",
    joptionpane.error_message);
   return;
  }
  try {
   closeserver();
   btn_start.setenabled(true);
   txt_max.setenabled(true);
   txt_port.setenabled(true);
   btn_stop.setenabled(false);
   contentarea.append("服务器成功停止!\r\n");
   joptionpane.showmessagedialog(frame, "服务器成功停止！");
  } catch (exception exc) {
   joptionpane.showmessagedialog(frame, "停止服务器发生异常！", "错误",
    joptionpane.error_message);
  }
  }
 });
 }
 
 // 启动服务器
 public void serverstart(int max, int port) throws java.net.bindexception 
 {
 try {
  clients = new arraylist<clientthread>();
  serversocket = new serversocket(port);
  serverthread = new serverthread(serversocket, max);
  serverthread.start();
  isstart = true;
 } catch (bindexception e) {
  isstart = false;
  throw new bindexception("端口号已被占用，请换一个！");
 } catch (exception e1) {
  e1.printstacktrace();
  isstart = false;
  throw new bindexception("启动服务器异常！");
 }
 }
 
 // 关闭服务器
 @suppresswarnings("deprecation")
 public void closeserver() {
 try {
  if (serverthread != null)
  serverthread.stop();// 停止服务器线程
 
  for (int i = clients.size() - 1; i >= 0; i--) {
  // 给所有在线用户发送关闭命令
  clients.get(i).getwriter().println("close");
  clients.get(i).getwriter().flush();
  // 释放资源
  clients.get(i).stop();// 停止此条为客户端服务的线程
  clients.get(i).reader.close();
  clients.get(i).writer.close();
  clients.get(i).socket.close();
  clients.remove(i);
  }
  if (serversocket != null) {
  serversocket.close();// 关闭服务器端连接
  }
  listmodel.removeallelements();// 清空用户列表
  isstart = false;
 } catch (ioexception e) {
  e.printstacktrace();
  isstart = true;
 }
 }
 
 // 群发服务器消息
 public void sendservermessage(string message) {
 for (int i = clients.size() - 1; i >= 0; i--) {
  clients.get(i).getwriter().println("服务器：" + message);
  clients.get(i).getwriter().flush();
 }
 }
 
 // 服务器线程
 class serverthread extends thread {
 private serversocket serversocket;
 private int max;// 人数上限
 
 // 服务器线程的构造方法
 public serverthread(serversocket serversocket, int max) {
  this.serversocket = serversocket;
  this.max = max;
 }
 
 public void run() {
  while (true) {// 不停的等待客户端的链接
  try {
   socket socket = serversocket.accept();
   if (clients.size() == max) {// 如果已达人数上限
   bufferedreader r = new bufferedreader(
    new inputstreamreader(socket.getinputstream()));
   printwriter w = new printwriter(socket
    .getoutputstream());
   // 接收客户端的基本用户信息
   string inf = r.readline();
   stringtokenizer st = new stringtokenizer(inf, "@");
   user user = new user(st.nexttoken(), st.nexttoken());
   // 反馈连接成功信息
   w.println("max@服务器：对不起，" + user.getname()
    + user.getip() + "，服务器在线人数已达上限，请稍后尝试连接！");
   w.flush();
   // 释放资源
   r.close();
   w.close();
   socket.close();
   continue;
   }
   clientthread client = new clientthread(socket);
   client.start();// 开启对此客户端服务的线程
   clients.add(client);
   listmodel.addelement(client.getuser().getname());// 更新在线列表
   contentarea.append(client.getuser().getname()
    + client.getuser().getip() + "上线!\r\n");
  } catch (ioexception e) {
   e.printstacktrace();
  }
  }
 }
 }
 
 // 为一个客户端服务的线程
 class clientthread extends thread 
 {
 private socket socket;
 private bufferedreader reader;
 private printwriter writer;
 private user user;
 
 public bufferedreader getreader() 
 {
  return reader;
 }
 
 public printwriter getwriter() 
 {
  return writer;
 }
 
 public user getuser() 
 {
  return user;
 }
 
 // 客户端线程的构造方法
 public clientthread(socket socket) 
 {
  try {
  this.socket = socket;
  reader = new bufferedreader(new inputstreamreader(socket
   .getinputstream()));
  writer = new printwriter(socket.getoutputstream());
  // 接收客户端的基本用户信息
  string inf = reader.readline();
  stringtokenizer st = new stringtokenizer(inf, "@");
  user = new user(st.nexttoken(), st.nexttoken());
  // 反馈连接成功信息
  writer.println(user.getname() + user.getip() + "与服务器连接成功!");
  writer.flush();
  // 反馈当前在线用户信息
  if (clients.size() > 0) 
  {
   string temp = "";
   for (int i = clients.size() - 1; i >= 0; i--) 
   {
   temp += (clients.get(i).getuser().getname() + "/" + clients
    .get(i).getuser().getip())
    + "@";
   }
   writer.println("userlist@" + clients.size() + "@" + temp);
   writer.flush();
  }
  // 向所有在线用户发送该用户上线命令
  for (int i = clients.size() - 1; i >= 0; i--) 
  {
   clients.get(i).getwriter().println(
    "add@" + user.getname() + user.getip());
   clients.get(i).getwriter().flush();
  }
  } catch (ioexception e) 
  {
  e.printstacktrace();
  }
 }
 
 @suppresswarnings("deprecation")
 public void run() {// 不断接收客户端的消息，进行处理。
  string message = null;
  while (true) {
  try {
   message = reader.readline();// 接收客户端消息
   if (message.equals("close"))// 下线命令
   {
   contentarea.append(this.getuser().getname()
    + this.getuser().getip() + "下线!\r\n");
   // 断开连接释放资源
   reader.close();
   writer.close();
   socket.close();
 
   // 向所有在线用户发送该用户的下线命令
   for (int i = clients.size() - 1; i >= 0; i--) 
   {
    clients.get(i).getwriter().println(
     "delete@" + user.getname());
    clients.get(i).getwriter().flush();
   }
 
   listmodel.removeelement(user.getname());// 更新在线列表
 
   // 删除此条客户端服务线程
   for (int i = clients.size() - 1; i >= 0; i--) 
   {
    if (clients.get(i).getuser() == user) 
    {
    clientthread temp = clients.get(i);
    clients.remove(i);// 删除此用户的服务线程
    temp.stop();// 停止这条服务线程
    return;
    }
   }
   } else {
   dispatchermessage(message);// 转发消息
   }
  } catch (ioexception e) 
  {
   e.printstacktrace();
  }
  }
 }
 
 // 转发消息
 public void dispatchermessage(string message) 
 {
  stringtokenizer stringtokenizer = new stringtokenizer(message, "@");
  string source = stringtokenizer.nexttoken();
  string owner = stringtokenizer.nexttoken();
  string content = stringtokenizer.nexttoken();
  message = source + "说：" + content;
  contentarea.append(message + "\r\n");
  if (owner.equals("all")) {// 群发
  for (int i = clients.size() - 1; i >= 0; i--) {
   clients.get(i).getwriter().println(message);
   clients.get(i).getwriter().flush();
  }
  }
 }
 }
}

运行截图

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