Java GUI编程实现在线聊天室

引言

综合应用Java的GUI编程和网络编程，实现一个能够支持多组用户同时使用的聊天室软件。该聊天室具有比较友好的GUI界面，并使用C/S模式，支持多个用户同时使用，用户可以自己选择加入或者创建房间，和房间内的其他用户互发信息（文字和图片）

主要功能

客户端的功能主要包括如下的功能：

• 选择连上服务端
• 显示当前房间列表（包括房间号和房间名称）
• 选择房间进入
• 多个用户在线群聊
• 可以发送表情（用本地的，实际上发送只发送表情的代码）
• 退出房间
• 选择创建房间
• 房间里没人（房主退出），导致房间解散
• 显示系统提示消息
• 显示用户消息
• 构造标准的消息结构发送
• 维护GUI所需的数据模型

服务端的功能主要包括：

• 维护用户信息和房间信息
• 处理用户发送来的消息选择转发或者回复处理结果
• 构造标准的消息结构发送

架构

整个程序采用C/S设计架构，分为一个服务端和多个客户端。服务端开放一个端口给所有开客户端，客户端连接该端口并收发信息，服务端在内部维护客户端的组，并对每一个客户端都用一个子线程来收发信息

基本类的设计

User类

package User;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

/**
 *
 * @author lannooo
 *
 */
public class User {
 private String name;
 private long id;
 private long roomId;
 private Socket socket;
 private BufferedReader br;
 private PrintWriter pw;

 /**
  *
  * @param name: 设置user的姓名
  * @param id：设置user的id
  * @param socket:保存用户连接的socket
  * @throws IOException
  */
 public User(String name, long id, final Socket socket) throws IOException {
  this.name=name;
  this.id=id;
  this.socket=socket;
  this.br=new BufferedReader(new InputStreamReader(
    socket.getInputStream()));
  this.pw=new PrintWriter(socket.getOutputStream());

 }

 /**
  * 获得该用户的id
  * @return id
  */
 public long getId() {
  return id;
 }

 /**
  * 设置该用户的id
  * @param id 新的id
  */
 public void setId(long id) {
  this.id = id;
 }

 /**
  * 获得用户当前所在的房间号
  * @return roomId
  */
 public long getRoomId() {
  return roomId;
 }

 /**
  * 设置当前用户的所在的房间号
  * @param roomId
  */
 public void setRoomId(long roomId) {
  this.roomId = roomId;
 }

 /**
  * 设置当前用户在聊天室中的昵称
  * @param name
  */
 public void setName(String name) {
  this.name = name;
 }

 /**
  * 返回当前用户在房间中的昵称
  * @return
  */
 public String getName() {
  return name;
 }

 /**
  * 返回当前用户连接的socket实例
  * @return
  */
 public Socket getSocket() {
  return socket;
 }

 /**
  * 设置当前用户连接的socket
  * @param socket
  */
 public void setSocket(Socket socket) {
  this.socket = socket;
 }

 /**
  * 获得该用户的消息读取辅助类BufferedReader实例
  * @return
  */
 public BufferedReader getBr() {
  return br;
 }

 /**
  * 设置 用户的消息读取辅助类
  * @param br
  */
 public void setBr(BufferedReader br) {
  this.br = br;
 }

 /**
  * 获得消息写入类实例
  * @return
  */
 public PrintWriter getPw() {
  return pw;
 }

 /**
  * 设置消息写入类实例
  * @param pw
  */
 public void setPw(PrintWriter pw) {
  this.pw = pw;
 }

 /**
  * 重写了用户类打印的函数
  */
 @Override
 public String toString() {
  return "#User"+id+"#"+name+"[#Room"+roomId+"#]<socket:"+socket+">";
 }
}

Room类

package Room;

import java.util.ArrayList;
import java.util.List;

import User.User;

/**
 *
 * @author lannooo
 *
 */
public class Room {
 private String name;
 private long roomId;
 private ArrayList<User> list;
 private int totalUsers;

 /**
  * 获得房间的名字
  * @return name
  */
 public String getName() {
  return name;
 }

 /**
  * 设置房间的新名字
  * @param name
  */
 public void setName(String name) {
  this.name = name;
 }

 /**
  * 获得房间的id号
  * @return
  */
 public long getRoomId() {
  return roomId;
 }

 /**
  * 设置房间的id
  * @param roomId
  */
 public void setRoomId(long roomId) {
  this.roomId = roomId;
 }

 /**
  * 向房间中加入一个新用户
  * @param user
  */
 public void addUser(User user) {
  if(!list.contains(user)){
   list.add(user);
   totalUsers++;
  }else{
   System.out.println("User is already in Room<"+name+">:"+user);
  }
 }

 /**
  * 从房间中删除一个用户
  * @param user
  * @return 目前该房间中的总用户数目
  */
 public int delUser(User user){
  if(list.contains(user)){
   list.remove(user);
   return --totalUsers;
  }else{
   System.out.println("User is not in Room<"+name+">:"+user);
   return totalUsers;
  }
 }

 /**
  * 获得当前房间的用户列表
  * @return
  */
 public ArrayList<User> getUsers(){
  return list;
 }

 /**
  * 获得当前房间的用户昵称的列表
  * @return
  */
 public String[] getUserNames(){
  String[] userList = new String[list.size()];
  int i=0;
  for(User each: list){
   userList[i++]=each.getName();
  }
  return userList;
 }

 /**
  * 使用房间的名称和id来new一个房间
  * @param name
  * @param roomId
  */
 public Room(String name, long roomId) {
  this.name=name;
  this.roomId=roomId;
  this.totalUsers=0;
  list = new ArrayList<>();
 }
}

RoomList类

package Room;

import java.awt.image.DirectColorModel;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import User.User;

/**
 *
 * @author lannooo
 *
 */
public class RoomList {
 private HashMap<Long, Room> map;
 private long unusedRoomId;
 public static long MAX_ROOMS = 9999;
 private int totalRooms;

 /**
  * 未使用的roomid从1算起，起始的房间总数为0
  */
 public RoomList(){
  map = new HashMap<>();
  unusedRoomId = 1;
  totalRooms = 0;
 }

 /**
  * 创建一个新的房间，使用未使用的房间号进行创建，如果没有可以使用的则就创建失败
  * @param name： 房间的名字
  * @return 创建的房间的id
  */
 public long createRoom(String name){
  if(totalRooms<MAX_ROOMS){
   if(name.length()==0){
    name = ""+unusedRoomId;
   }
   Room room = new Room(name, unusedRoomId);
   map.put(unusedRoomId, room);
   totalRooms++;
   return unusedRoomId++;
  }else{
   return -1;
  }
 }
 /**
  * 用户加入一个房间
  * @param user
  * @param roomID
  * @return
  */
 public boolean join(User user, long roomID){
  if(map.containsKey(roomID)){
   map.get(roomID).addUser(user);
   return true;
  }else{
   return false;
  }
 }

 /**
  * 用户退出他的房间
  * @param user
  * @param roomID
  * @return
  */
 public int esc(User user, long roomID){
  if(map.containsKey(roomID)){
   int number = map.get(roomID).delUser(user);
   /*如果这个房间剩下的人数为0，那么删除该房间*/
   if(number==0){
    map.remove(roomID);
    totalRooms--;
    return 0;
   }
   return 1;
  }else{
   return -1;
  }
 }
 /**
  * 列出所有房间的列表，返回一个二维数组，strings[i][0]放房间的id，string[i][1]放房间的name
  * @return
  */
 public String[][] listRooms(){
  String[][] strings = new String[totalRooms][2];
  int i=0;
  /*将map转化为set并使用迭代器来遍历*/
  Set<Entry<Long, Room>> set = map.entrySet();
  Iterator<Entry<Long, Room>> iterator = set.iterator();
  while(iterator.hasNext()){
   Map.Entry<Long, Room> entry = iterator.next();
   long key = entry.getKey();
   Room value = entry.getValue();
   strings[i][0]=""+key;
   strings[i][1]=value.getName();
  }
  return strings;
 }

 /**
  * 通过roomID来获得房间
  * @param roomID
  * @return
  */
 public Room getRoom(long roomID){
  if(map.containsKey(roomID)){
   return map.get(roomID);
  }
  else
   return null;
 }
}

服务端

Server

package Server;

import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.json.*;

import Room.Room;
import Room.RoomList;
import User.User;
/**
 *
 * @author lannooo
 *
 */
public class Server {
 private ArrayList<User> allUsers;
 private RoomList rooms;
 private int port;
 private ServerSocket ss;
 private long unusedUserID;
 public final long MAX_USERS = 999999;

 /**
  * 通过port号来构造服务器端对象
  * 维护一个总的用户列表和一个房间列表
  * @param port
  * @throws Exception
  */
 public Server(int port) throws Exception {
  allUsers = new ArrayList<>();
  rooms = new RoomList();
  this.port=port;
  unusedUserID=1;
  ss = new ServerSocket(port);
  System.out.println("Server is builded!");
 }

 /**
  * 获得下一个可用的用户id
  * @return
  */
 private long getNextUserID(){
  if(unusedUserID < MAX_USERS)
   return unusedUserID++;
  else
   return -1;
 }

 /**
  * 开始监听，当接受到新的用户连接，就创建一个新的用户，并添加到用户列表中
  * 然后创建一个新的服务线程用于收发该用户的消息
  * @throws Exception
  */
 public void startListen() throws Exception{
  while(true){
   Socket socket = ss.accept();
   long id = getNextUserID();
   if(id != -1){
    User user = new User("User"+id, id, socket);
    System.out.println(user.getName() + " is login...");
    allUsers.add(user);
    ServerThread thread = new ServerThread(user, allUsers, rooms);
    thread.start();
   }else{
    System.out.println("Server is full!");
    socket.close();
   }
  }
 }

 /**
  * 测试用main方法，设置侦听端口为9999，并开始监听
  * @param args
  */
 public static void main(String[] args) {
  try {
   Server server = new Server(9999);
   server.startListen();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

ServerThread

package Server;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import Room.Room;
import Room.RoomList;
import User.User;

/**
 *
 * @author lannooo
 *
 */
public class ServerThread extends Thread {
 private User user;
 private ArrayList<User> userList;/*保存用户列表*/
 private RoomList map;   /*保存房间列表*/
 private long roomId;
 private PrintWriter pw;
 /**
  * 通过用户的对象实例、全局的用户列表、房间列表进行构造
  * @param user
  * @param userList
  * @param map
  */
 public ServerThread(User user,
   ArrayList<User> userList, RoomList map){
  this.user=user;
  this.userList=userList;
  this.map=map;
  pw=null;
  roomId = -1;
 }

 /**
  * 线程运行部分，持续读取用户socket发送来的数据，并解析
  */
 public void run(){
  try{
   while (true) {
    String msg=user.getBr().readLine();
    System.out.println(msg); /*解析用户的数据格式*/
    parseMsg(msg);
   }
  }catch (SocketException se) { /*处理用户断开的异常*/
   System.out.println("user "+user.getName()+" logout.");

  }catch (Exception e) { /*处理其他异常*/
   e.printStackTrace();
  }finally {
   try {
    /*
     * 用户断开或者退出，需要把该用户移除
     * 并关闭socket
     */
    remove(user);
    user.getBr().close();
    user.getSocket().close();
   } catch (IOException ioe) {
    ioe.printStackTrace();
   }
  }
 }

 /**
  * 用正则表达式匹配数据的格式，根据不同的指令类型，来调用相应的方法处理
  * @param msg
  */
 private void parseMsg(String msg){
  String code = null;
  String message=null;
  if(msg.length()>0){
   /*匹配指令类型部分的字符串*/
   Pattern pattern = Pattern.compile("<code>(.*)</code>");
   Matcher matcher = pattern.matcher(msg);
   if(matcher.find()){
    code = matcher.group(1);
   }
   /*匹配消息部分的字符串*/
   pattern = Pattern.compile("<msg>(.*)</msg>");
   matcher = pattern.matcher(msg);
   if(matcher.find()){
    message = matcher.group(1);
   }

   switch (code) {
   case "join":
    // add to the room
    // code = 1, 直接显示在textArea中
    // code = 11, 在list中加入
    // code = 21, 把当前房间里的所有用户返回给client
    if(roomId == -1){
     roomId = Long.parseLong(message);
     map.join(user, roomId);
     sendRoomMsgExceptSelf(buildCodeWithMsg("<name>"+user.getName()+"</name><id>"+user.getId()+"</id>", 11));
     // 这个消息需要加入房间里已有用户的列表
     returnMsg(buildCodeWithMsg("你加入了房间:" + map.getRoom(roomId).getName(), 1));
     returnMsg(buildCodeWithMsg(getMembersInRoom(), 21));
    }else{
     map.esc(user, roomId);
     sendRoomMsg(buildCodeWithMsg(""+user.getId(), 12));
     long oldRoomId = roomId;
     roomId = Long.parseLong(message);
     map.join(user, roomId);
     sendRoomMsgExceptSelf(buildCodeWithMsg("<name>"+user.getName()+"</name><id>"+user.getId()+"</id>", 11));
     returnMsg(buildCodeWithMsg("你退出房间:" + map.getRoom(oldRoomId).getName() + ",并加入了房间:" + roomId,1));
     returnMsg(buildCodeWithMsg(getMembersInRoom(), 21));
    }
    break;
   case "esc":
    // delete from room list
    // code = 2， 弹窗提示
    // code = 12, 对所有该房间的其他用户发送该用户退出房间的信息，从list中删除
    if(roomId!=-1){
     int flag=map.esc(user, roomId);
     sendRoomMsgExceptSelf(buildCodeWithMsg(""+user.getId(), 12));
     long oldRoomId=roomId;
     roomId = -1;
     returnMsg(buildCodeWithMsg("你已经成功退出房间，不会收到消息", 2));
     if(flag==0){
      sendMsg(buildCodeWithMsg(""+oldRoomId, 13));
     }
    }else{
     returnMsg(buildCodeWithMsg("你尚未加入任何房间", 2));
    }
    break;
   case "list":
    // list all the rooms
    // code = 3, 在客户端解析rooms，并填充roomlist
    returnMsg(buildCodeWithMsg(getRoomsList(), 3));
    break;
   case "message":
    // send message
    // code = 4, 自己收到的话，打印的是‘你说：....'否则打印user id对应的name
    sendRoomMsg(buildCodeWithMsg("<from>"+user.getId()+"</from><smsg>"+message+"</smsg>", 4));
    break;
   case "create":
    // create a room
    // code=5,提示用户进入了房间
    // code=15,需要在其他所有用户的room列表中更新
    roomId = map.createRoom(message);
    map.join(user, roomId);
    sendMsg(buildCodeWithMsg("<rid>"+roomId+"</rid><rname>"+message+"</rname>", 15));
    returnMsg(buildCodeWithMsg("你进入了创建的房间："+map.getRoom(roomId).getName(), 5));
    returnMsg(buildCodeWithMsg(getMembersInRoom(), 21));
    break;
   case "setname":
    // set name for user
    // code=16,告诉房间里的其他人，你改了昵称
    user.setName(message);
    sendRoomMsg(buildCodeWithMsg("<id>"+user.getId()+"</id><name>"+message+"</name>", 16));
    break;
   default:
    // returnMsg("something unknown");
    System.out.println("not valid message from user"+user.getId());
    break;
   }
  }
 }

 /**
  * 获得该用户房间中的所有用户列表，并构造成一定格式的消息返回
  * @return
  */
 private String getMembersInRoom(){
  /*先从room列表获得该用户的room*/
  Room room = map.getRoom(roomId);
  StringBuffer stringBuffer = new StringBuffer();
  if(room != null){
   /*获得房间中所有的用户的列表，然后构造成一定的格式发送回去*/
   ArrayList<User> users = room.getUsers();
   for(User each: users){
    stringBuffer.append("<member><name>"+each.getName()+
        "</name><id>"+each.getId()+"</id></member>");
   }
  }
  return stringBuffer.toString();
 }

 /**
  * 获得所有房间的列表，并构造成一定的格式
  * @return
  */
 private String getRoomsList(){
  String[][] strings = map.listRooms();
  StringBuffer sb = new StringBuffer();
  for(int i=0; i<strings.length; i++){
   sb.append("<room><rname>"+strings[i][1]+
      "</rname><rid>"+strings[i][0]+"</rid></room>");
  }
  return sb.toString();
 }

 /**
  * 构造成一个统一的消息格式
  * @param msg
  * @param code
  * @return
  */
 private String buildCodeWithMsg(String msg, int code){
  return "<code>"+code+"</code><msg>"+msg+"</msg>\n";
 }

 /**
  * 这个是群发消息：全体用户,code>10
  * @param msg
  */
 private void sendMsg(String msg) {
//  System.out.println("In sendMsg()");
  /*取出用户列表中的每一个用户来发送消息*/
  for(User each:userList){
   try {
    pw=each.getPw();
    pw.println(msg);
    pw.flush();
    System.out.println(msg);
   } catch (Exception e) {
    System.out.println("exception in sendMsg()");
   }
  }
 }

 /**
  * 只对同一房间的用户发：code>10
  * @param msg
  */
 private void sendRoomMsg(String msg){
  /*先获得该用户的房间号，然后往该房间发送消息*/
  Room room = map.getRoom(roomId);
  if(room != null){
   ArrayList<User> users = room.getUsers();
   for(User each: users){
    pw = each.getPw();
    pw.println(msg);
    pw.flush();
   }
  }
 }
 /**
  * 向房间中除了该用户自己，发送消息
  * @param msg
  */
 private void sendRoomMsgExceptSelf(String msg){
  Room room = map.getRoom(roomId);
  if(room != null){
   ArrayList<User> users = room.getUsers();
   for(User each: users){
    if(each.getId()!=user.getId()){
     pw = each.getPw();
     pw.println(msg);
     pw.flush();
    }
   }
  }
 }

 /**
  * 对于client的来信，返回一个结果,code<10
  * @param msg
  */
 private void returnMsg(String msg){
  try{
   pw = user.getPw();
   pw.println(msg);
   pw.flush();
  }catch (Exception e) {
   System.out.println("exception in returnMsg()");
  }
 }

 /**
  * 移除该用户，并向房间中其他用户发送该用户已经退出的消息
  * 如果房间中没人了，那么就更新房间列表给所有用户
  * @param user
  */
 private void remove(User user){
  if(roomId!=-1){
   int flag=map.esc(user, roomId);
   sendRoomMsgExceptSelf(buildCodeWithMsg(""+user.getId(), 12));
   long oldRoomId=roomId;
   roomId = -1;
   if(flag==0){
    sendMsg(buildCodeWithMsg(""+oldRoomId, 13));
   }
  }
  userList.remove(user);
 }
}

客户端

Client

package Client;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.DefaultListModel;
import javax.swing.Icon;
import javax.swing.ImageIcon;
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.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;

/**
 *
 * @author lannooo
 *
 */
public class Client implements ActionListener{
 private JFrame frame;
 private Socket socket;
 private BufferedReader br;
 private PrintWriter pw;
 private String name;
 private HashMap<String, Integer> rooms_map;
 private HashMap<String, Integer> users_map;
 private JTextField host_textfield;
 private JTextField port_textfield;
 private JTextField text_field;
 private JTextField name_textfiled;
 private JLabel rooms_label;
 private JLabel users_label;
 private JList<String> roomlist;
 private JList<String> userlist;
 private JTextPane msgArea;
 private JScrollPane textScrollPane;
 private JScrollBar vertical;
 DefaultListModel<String> rooms_model;
 DefaultListModel<String> users_model;

 /*
  * 构造函数
  * 该客户端对象维护两个map，房间的hashmap和房间中用户的hashmap
  * 作为列表组件的数据模型
  */
 public Client(){
  rooms_map = new HashMap<>();
  users_map = new HashMap<>();
  initialize();
 }

 /**
  * 连接服务端，指定host和port
  * @param host
  * @param port
  * @return
  */
 public boolean connect(String host, int port){
  try {
   socket = new Socket(host, port);
   System.out.println("Connected to server!"+socket.getRemoteSocketAddress());
   br=new BufferedReader(new InputStreamReader(System.in));
   pw=new PrintWriter(socket.getOutputStream());
   /*
    * 创建一个接受和解析服务器消息的线程
    * 传入当前客户端对象的指针，作为句柄调用相应的处理函数
    */
   ClientThread thread = new ClientThread(socket, this);
   thread.start();

   return true;

  } catch (IOException e) {
   System.out.println("Server error");
   JOptionPane.showMessageDialog(frame, "服务器无法连接！");
   return false;
  }
 }

 /*当前进程作为只发送消息的线程，从命令行中获取输入*/
// public void sendMsg(){
//  String msg;
//  try {
//   while(true){
//    msg = br.readLine();
//    pw.println(msg);
//    pw.flush();
//   }
//  } catch (IOException e) {
//   System.out.println("error when read msg and to send.");
//  }
// }

 /**
  * 发给服务器的消息，先经过一定的格式构造再发送
  * @param msg
  * @param code
  */
 public void sendMsg(String msg, String code){
  try {
   pw.println("<code>"+code+"</code><msg>"+msg+"</msg>");
   pw.flush();
  } catch (Exception e) {
   //一般是没有连接的问题
   System.out.println("error in sendMsg()");
   JOptionPane.showMessageDialog(frame, "请先连接服务器！");
  }
 }

 /**
  * 窗口初始化
  */
 private void initialize() {
  /*设置窗口的UI风格和字体*/
  setUIStyle();
  setUIFont();

  JFrame frame = new JFrame("ChatOnline");
  JPanel panel = new JPanel();  /*主要的panel，上层放置连接区，下层放置消息区，
             中间是消息面板，左边是room列表，右边是当前room的用户列表*/
  JPanel headpanel = new JPanel(); /*上层panel，用于放置连接区域相关的组件*/
  JPanel footpanel = new JPanel(); /*下层panel，用于放置发送信息区域的组件*/
  JPanel leftpanel = new JPanel(); /*左边panel，用于放置房间列表和加入按钮*/
  JPanel rightpanel = new JPanel(); /*右边panel，用于放置房间内人的列表*/

  /*最上层的布局，分中间，东南西北五个部分*/
  BorderLayout layout = new BorderLayout();
  /*格子布局，主要用来设置西、东、南三个部分的布局*/
  GridBagLayout gridBagLayout = new GridBagLayout();
  /*主要设置北部的布局*/
  FlowLayout flowLayout = new FlowLayout();
  /*设置初始窗口的一些性质*/
  frame.setBounds(100, 100, 800, 600);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setContentPane(panel);
  frame.setLayout(layout);
  /*设置各个部分的panel的布局和大小*/
  headpanel.setLayout(flowLayout);
  footpanel.setLayout(gridBagLayout);
  leftpanel.setLayout(gridBagLayout);
  rightpanel.setLayout(gridBagLayout);
  leftpanel.setPreferredSize(new Dimension(130, 0));
  rightpanel.setPreferredSize(new Dimension(130, 0));

  /*以下均是headpanel中的组件*/
  host_textfield = new JTextField("127.0.0.1");
  port_textfield = new JTextField("9999");
  name_textfiled = new JTextField("匿名");
  host_textfield.setPreferredSize(new Dimension(100, 25));
  port_textfield.setPreferredSize(new Dimension(70, 25));
  name_textfiled.setPreferredSize(new Dimension(150, 25));

  JLabel host_label = new JLabel("服务器IP");
  JLabel port_label = new JLabel("端口");
  JLabel name_label = new JLabel("昵称");

  JButton head_connect = new JButton("连接");
//  JButton head_change = new JButton("确认更改");
  JButton head_create = new JButton("创建房间");

  headpanel.add(host_label);
  headpanel.add(host_textfield);
  headpanel.add(port_label);
  headpanel.add(port_textfield);
  headpanel.add(head_connect);
  headpanel.add(name_label);
  headpanel.add(name_textfiled);
//  headpanel.add(head_change);
  headpanel.add(head_create);

  /*以下均是footpanel中的组件*/
  JButton foot_emoji = new JButton("表情");
  JButton foot_send = new JButton("发送");
  text_field = new JTextField();
  footpanel.add(text_field, new GridBagConstraints(0, 0, 1, 1, 100, 100,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  footpanel.add(foot_emoji, new GridBagConstraints(1, 0, 1, 1, 1.0, 1.0,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  footpanel.add(foot_send, new GridBagConstraints(2, 0, 1, 1, 1.0, 1.0,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));

  /*两边的格子中的组件*/
  rooms_label = new JLabel("当前房间数：0");
  users_label = new JLabel("房间内人数：0");
  JButton join_button = new JButton("加入房间");
  JButton esc_button = new JButton("退出房间");

  rooms_model = new DefaultListModel<>();
  users_model = new DefaultListModel<>();
//  rooms_model.addElement("房间1");
//  rooms_model.addElement("房间2");
//  rooms_model.addElement("房间3");
//  String fangjian = "房间1";
//  rooms_map.put(fangjian, 1);

  roomlist = new JList<>(rooms_model);
  userlist = new JList<>(users_model);

  JScrollPane roomListPane = new JScrollPane(roomlist);
  JScrollPane userListPane = new JScrollPane(userlist);

  leftpanel.add(rooms_label, new GridBagConstraints(0, 0, 1, 1, 1, 1,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  leftpanel.add(join_button, new GridBagConstraints(0, 1, 1, 1, 1, 1,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  leftpanel.add(esc_button, new GridBagConstraints(0, 2, 1, 1, 1, 1,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  leftpanel.add(roomListPane, new GridBagConstraints(0, 3, 1, 1, 100, 100,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  rightpanel.add(users_label, new GridBagConstraints(0, 0, 1, 1, 1, 1,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
  rightpanel.add(userListPane,new GridBagConstraints(0, 1, 1, 1, 100, 100,
    GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));

  /*中间的文本区组件*/
  msgArea = new JTextPane();
  msgArea.setEditable(false);
  textScrollPane = new JScrollPane();
  textScrollPane.setViewportView(msgArea);
  vertical = new JScrollBar(JScrollBar.VERTICAL);
  vertical.setAutoscrolls(true);
  textScrollPane.setVerticalScrollBar(vertical);

  /*设置顶层布局*/
  panel.add(headpanel, "North");
  panel.add(footpanel, "South");
  panel.add(leftpanel, "West");
  panel.add(rightpanel, "East");
  panel.add(textScrollPane, "Center");

  /*注册各种事件*/
  /*连接服务器*/
  head_connect.addActionListener(this);
  /*发送消息，如果没有连接则会弹窗提示*/
  foot_send.addActionListener(this);
  /*改名字*/
//  head_change.addActionListener(this);
  /*创建房间*/
  head_create.addActionListener(this);
  /*发送表情*/
  foot_emoji.addActionListener(this);
  /*加入room*/
  join_button.addActionListener(this);
  /*退出房间*/
  esc_button.addActionListener(this);

  /*最终显示*/
  frame.setVisible(true);
 }

 /**
  * 事件监听处理
  */
 @Override
 public void actionPerformed(ActionEvent e) {
  String cmd = e.getActionCommand();
  switch (cmd) {
  case "连接": /*点击连接按钮*/
   String strhost = host_textfield.getText();
   String strport = port_textfield.getText();
   connect(strhost, Integer.parseInt(strport));
   String nameSeted = JOptionPane.showInputDialog("请输入你的昵称："); /*提示输入昵称*/
   name_textfiled.setText(nameSeted);
   name_textfiled.setEditable(false);
   port_textfield.setEditable(false);
   host_textfield.setEditable(false);
   /*发送设置姓名的消息和列出用户列表的消息*/
   sendMsg(nameSeted, "setname");
   sendMsg("", "list");
   break;
//  case "确认更改":
//   String strname = name_textfiled.getText();
//   name = strname;
//   sendMsg(strname, "setname");
//   break;
  case "加入房间": /*选择房间后，点击加入房间按钮*/
   String selected = roomlist.getSelectedValue();
   if(rooms_map.containsKey(selected)){
    sendMsg(""+rooms_map.get(selected), "join");
   }
   break;
  case "退出房间": /*点击退出房间的按钮*/
   sendMsg("", "esc");
   break;
  case "发送":  /*点击发送消息的按钮*/
   String text = text_field.getText();
   text_field.setText("");
   sendMsg(text, "message");
   break;
  case "表情":  /*发送表情，新建一个表情窗口，并直接在表情窗口中处理消息发送*/
   IconDialog dialog = new IconDialog(frame, this);
   break;
  case "创建房间": /*点击创建房间的按钮，弹出提示框数据房间名称*/
   String string = JOptionPane.showInputDialog("请输入你的房间名称");
   if(string==null || string.equals("")){
    string = name+(int)(Math.random()*10000)+"的房间";
   }
   sendMsg(string, "create");
   break;
  default:
   break;
  }

 }

 /*很多辅助和clientThread互动的*/

 /**
  * 加入用户，通过正则表达式，匹配消息内容中的用户信息
  * @param content
  */
 public void addUser(String content){
  if(content.length()>0){
   Pattern pattern = Pattern.compile("<name>(.*)</name><id>(.*)</id>");
   Matcher matcher = pattern.matcher(content);
   if(matcher.find()){
    /*
     * 获得用户的name和id
     * 加入用户列表
     * 在消息区显示系统提示
     */
    String name = matcher.group(1);
    String id = matcher.group(2);
    insertUser(Integer.parseInt(id), name);
    insertMessage(textScrollPane, msgArea, null, "系统：", name+"加入了聊天室");
   }
  }
  users_label.setText("房间内人数："+users_map.size()); /*更新房间内的人数*/
 }

 /**
  * 删除用户
  * @param content
  */
 public void delUser(String content){
  if(content.length()>0){
   int id = Integer.parseInt(content);
   /*
    * 从维护的用户map中取得所有的用户名字，然后去遍历匹配的用户
    * 匹配到的用户名字从相应的数据模型中移除
    * 并从map中移除，并在消息框中提示系统消息
    */
   Set<String> set = users_map.keySet();
   Iterator<String> iter = set.iterator();
   String name=null;
   while(iter.hasNext()){
    name = iter.next();
    if(users_map.get(name)==id){
     users_model.removeElement(name);
     break;
    }
   }
   users_map.remove(name);
   insertMessage(textScrollPane, msgArea, null, "系统：", name+"退出了聊天室");
  }
  users_label.setText("房间内人数："+users_map.size());
 }

 /**
  * 更新用户信息
  * @param content
  */
 public void updateUser(String content){
  if(content.length()>0){
   Pattern pattern = Pattern.compile("<id>(.*)</id><name>(.*)</name>");
   Matcher matcher = pattern.matcher(content);
   if(matcher.find()){
    String id = matcher.group(1);
    String name = matcher.group(2);
    insertUser(Integer.parseInt(id), name);
   }
  }
 }

 /**
  * 列出所有用户
  * @param content
  */
 public void listUsers(String content){
  String name = null;
  String id=null;
  Pattern rough_pattern=null;
  Matcher rough_matcher=null;
  Pattern detail_pattern=null;
  /*
   * 先用正则表达式匹配用户信息
   * 然后插入数据模型中
   * 并更新用户数据模型中的条目
   */
  if(content.length()>0){
   rough_pattern = Pattern.compile("<member>(.*?)</member>");
   rough_matcher = rough_pattern.matcher(content);
   while(rough_matcher.find()){
    String detail = rough_matcher.group(1);
    detail_pattern = Pattern.compile("<name>(.*)</name><id>(.*)</id>");
    Matcher detail_matcher = detail_pattern.matcher(detail);
    if(detail_matcher.find()){
     name = detail_matcher.group(1);
     id = detail_matcher.group(2);
     insertUser(Integer.parseInt(id), name);
    }
   }
  }
  users_label.setText("房间内人数："+users_map.size());
 }

 /**
  * 直接在textarea中显示消息
  * @param content
  */
 public void updateTextArea(String content){
  insertMessage(textScrollPane, msgArea, null, "系统：", content);
 }

 /**
  * 在textarea中显示其他用户的消息
  * 先用正则匹配，再显示消息
  * 其中还需要匹配emoji表情的编号
  * @param content
  */
 public void updateTextAreaFromUser(String content){
  if(content.length()>0){
   Pattern pattern = Pattern.compile("<from>(.*)</from><smsg>(.*)</smsg>");
   Matcher matcher = pattern.matcher(content);
   if(matcher.find()){
    String from = matcher.group(1);
    String smsg = matcher.group(2);
    String fromName = getUserName(from);
    if(fromName.equals(name))
     fromName = "你";
    if(smsg.startsWith("<emoji>")){
     String emojiCode = smsg.substring(7, smsg.length()-8);
//     System.out.println(emojiCode);
     insertMessage(textScrollPane, msgArea, emojiCode, fromName+"说：", null);
     return ;
    }
    insertMessage(textScrollPane, msgArea, null, fromName+"说：", smsg);
   }
  }
 }

 /**
  * 显示退出的结果
  * @param content
  */
 public void showEscDialog(String content){
  JOptionPane.showMessageDialog(frame, content);
  /*清除消息区内容，清除用户数据模型内容和用户map内容，更新房间内人数*/
  msgArea.setText("");
  users_model.clear();
  users_map.clear();
  users_label.setText("房间内人数：0");

 }
 /**
  * 新增一个room
  * @param content
  */
 public void addRoom(String content){
  if(content.length()>0){
   Pattern pattern = Pattern.compile("<rid>(.*)</rid><rname>(.*)</rname>");
   Matcher matcher = pattern.matcher(content);
   if(matcher.find()){
    String rid = matcher.group(1);
    String rname = matcher.group(2);
    insertRoom(Integer.parseInt(rid), rname);
   }
  }
  rooms_label.setText("当前房间数："+rooms_map.size());
 }

 /**
  * 删除一个room
  * @param content
  */
 public void delRoom(String content){
  if(content.length()>0){
   int delRoomId = Integer.parseInt(content);

   Set<String> set = rooms_map.keySet();
   Iterator<String> iter = set.iterator();
   String rname=null;
   while(iter.hasNext()){
    rname = iter.next();
    if(rooms_map.get(rname)==delRoomId){
     rooms_model.removeElement(rname);
     break;
    }
   }
   rooms_map.remove(rname);
  }
  rooms_label.setText("当前房间数："+rooms_map.size());
 }

 /**
  * 列出目前所有的rooms
  * @param content
  */
 public void listRooms(String content){
  String rname = null;
  String rid=null;
  Pattern rough_pattern=null;
  Matcher rough_matcher=null;
  Pattern detail_pattern=null;
  if(content.length()>0){
   rough_pattern = Pattern.compile("<room>(.*?)</room>");
   rough_matcher = rough_pattern.matcher(content);
   while(rough_matcher.find()){
    String detail = rough_matcher.group(1);
    detail_pattern = Pattern.compile("<rname>(.*)</rname><rid>(.*)</rid>");
    Matcher detail_matcher = detail_pattern.matcher(detail);
    if(detail_matcher.find()){
     rname = detail_matcher.group(1);
     rid = detail_matcher.group(2);
     insertRoom(Integer.parseInt(rid), rname);
    }
   }
  }
  rooms_label.setText("当前房间数："+rooms_map.size());
 }
 /**
  * 插入一个room
  * @param rid
  * @param rname
  */
 private void insertRoom(Integer rid, String rname){
  if(!rooms_map.containsKey(rname)){
   rooms_map.put(rname, rid);
   rooms_model.addElement(rname);
  }else{
   rooms_map.remove(rname);
   rooms_model.removeElement(rname);
   rooms_map.put(rname, rid);
   rooms_model.addElement(rname);
  }
  rooms_label.setText("当前房间数："+rooms_map.size());
 }
 /**
  * 插入一个user
  * @param id
  * @param name
  */
 private void insertUser(Integer id, String name){
  if(!users_map.containsKey(name)){
   users_map.put(name, id);
   users_model.addElement(name);
  }else{
   users_map.remove(name);
   users_model.removeElement(name);
   users_map.put(name, id);
   users_model.addElement(name);
  }
  users_label.setText("房间内人数："+users_map.size());
 }

 /**
  * 获得用户的姓名
  * @param strId
  * @return
  */
 private String getUserName(String strId){
  int uid = Integer.parseInt(strId);
  Set<String> set = users_map.keySet();
  Iterator<String> iterator = set.iterator();
  String cur=null;
  while(iterator.hasNext()){
   cur = iterator.next();
   if(users_map.get(cur)==uid){
    return cur;
   }
  }
  return "";
 }

 /**
  * 获得用户所在房间的名称
  * @param strId
  * @return
  */
 private String getRoomName(String strId){
  int rid = Integer.parseInt(strId);
  Set<String> set = rooms_map.keySet();
  Iterator<String> iterator = set.iterator();
  String cur = null;
  while(iterator.hasNext()){
   cur = iterator.next();
   if(rooms_map.get(cur)==rid){
    return cur;
   }
  }
  return "";
 }

 /**
  * 打印一条消息，如果有图片就打印图片，否则打印content
  * @param scrollPane
  * @param textPane
  * @param icon_code
  * @param title
  * @param content
  */
 private void insertMessage(JScrollPane scrollPane, JTextPane textPane,
   String icon_code, String title, String content){
  StyledDocument document = textPane.getStyledDocument();  /*获取textpane中的文本*/
  /*设置标题的属性*/
  SimpleAttributeSet title_attr = new SimpleAttributeSet();
  StyleConstants.setBold(title_attr, true);
  StyleConstants.setForeground(title_attr, Color.BLUE);
  /*设置正文的属性*/
  SimpleAttributeSet content_attr = new SimpleAttributeSet();
  StyleConstants.setBold(content_attr, false);
  StyleConstants.setForeground(content_attr, Color.BLACK);
  Style style = null;
  if(icon_code!=null){
   Icon icon = new ImageIcon("icon/"+icon_code+".png");
   style = document.addStyle("icon", null);
   StyleConstants.setIcon(style, icon);
  }

  try {
   document.insertString(document.getLength(), title+"\n", title_attr);
   if(style!=null)
    document.insertString(document.getLength(), "\n", style);
   else
    document.insertString(document.getLength(), " "+content+"\n", content_attr);

  } catch (BadLocationException ex) {
   System.out.println("Bad location exception");
  }
  /*设置滑动条到最后*/
  vertical.setValue(vertical.getMaximum());
 }

 /**
  * 设置需要美化字体的组件
  */
 public static void setUIFont()
 {
  Font f = new Font("微软雅黑", Font.PLAIN, 14);
  String names[]={ "Label", "CheckBox", "PopupMenu","MenuItem", "CheckBoxMenuItem",
    "JRadioButtonMenuItem","ComboBox", "Button", "Tree", "ScrollPane",
    "TabbedPane", "EditorPane", "TitledBorder", "Menu", "TextArea","TextPane",
    "OptionPane", "MenuBar", "ToolBar", "ToggleButton", "ToolTip",
    "ProgressBar", "TableHeader", "Panel", "List", "ColorChooser",
    "PasswordField","TextField", "Table", "Label", "Viewport",
    "RadioButtonMenuItem","RadioButton", "DesktopPane", "InternalFrame"
  };
  for (String item : names) {
    UIManager.put(item+ ".font",f);
  }
 }
 /**
  * 设置UI风格为当前系统的风格
  */
 public static void setUIStyle(){
  String lookAndFeel =UIManager.getSystemLookAndFeelClassName();
  try {
   UIManager.setLookAndFeel(lookAndFeel);
  } catch (ClassNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (InstantiationException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IllegalAccessException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (UnsupportedLookAndFeelException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }

 /**
  * 测试用的main函数
  * @param args
  */
 public static void main(String[] args) {
  Client client = new Client();
 }

}

ClientThread

package Client;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 *
 * @author lannooo
 *
 */
public class ClientThread extends Thread{
 private Socket socket;
 private Client client;
 private BufferedReader br;
 private PrintWriter pw;
 /**
  * 从过主线程传入的socket和client对象来构造
  * @param socket
  * @param client
  */
 public ClientThread(Socket socket, Client client){
  this.client = client;
  this.socket = socket;
  try {
   br=new BufferedReader(new InputStreamReader(socket.getInputStream()));

  } catch (IOException e) {
   System.out.println("cannot get inputstream from socket.");
  }
 }

 /**
  * 不断的读数据并处理
  * 调用主线程的方法来处理：client.method();
  */
 public void run() {
  try{
   br=new BufferedReader(new InputStreamReader(socket.getInputStream()));
   while(true){
    String msg = br.readLine();
    parseMessage(msg);
   }
  }catch (Exception e) {
   e.printStackTrace();
  }
 }
 /**
  * 处理从服务器收到的消息
  * @param message
  */
 public void parseMessage(String message){
  String code = null;
  String msg=null;
  /*
   * 先用正则表达式匹配code码和msg内容
   */
  if(message.length()>0){
   Pattern pattern = Pattern.compile("<code>(.*)</code>");
   Matcher matcher = pattern.matcher(message);
   if(matcher.find()){
    code = matcher.group(1);
   }
   pattern = Pattern.compile("<msg>(.*)</msg>");
   matcher = pattern.matcher(message);
   if(matcher.find()){
    msg = matcher.group(1);
   }
   System.out.println(code+":"+msg);
   switch(code){
   case "1": /*一个普通消息处理*/
    client.updateTextArea(msg);
    break;
   case "2": /*退出消息*/
    client.showEscDialog(msg);
    break;
   case "3": /*列出房间*/
    client.listRooms(msg);
    break;
   case "4": /*其他用户的消息*/
    client.updateTextAreaFromUser(msg);
    break;
   case "5": /*普通消息处理*/
    client.updateTextArea(msg);
    break;
   case "11": /*添加用户*/
    client.addUser(msg);
    break;
   case "12": /*删除用户*/
    client.delUser(msg);
    break;
   case "13": /*删除房间*/
    client.delRoom(msg);
    break;
   case "15": /*添加房间*/
    client.addRoom(msg);
    break;
   case "16": /*更新用户名称*/
    client.updateUser(msg);
    break;
   case "21": /*列出用户列表*/
    client.listUsers(msg);
    break;
   }
  }

 }
}

IconDialog（选择表情界面）

package Client;

import java.awt.Container;
import java.awt.Dialog;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
/**
 *
 * @author lannooo
 *
 */
public class IconDialog implements ActionListener {

 private JDialog dialog;
 private Client client;
 /**
  * 通过frame和客户端对象来构造
  * @param frame
  * @param client
  */
 public IconDialog(JFrame frame, Client client) {
  this.client = client;
  dialog = new JDialog(frame, "请选择表情", true);
  /*16个表情*/
  JButton[] icon_button = new JButton[16];
  ImageIcon[] icons = new ImageIcon[16];
  /*获得弹出窗口的容器，设置布局*/
  Container dialogPane = dialog.getContentPane();
  dialogPane.setLayout(new GridLayout(0, 4));
  /*加入表情*/
  for(int i=1; i<=15; i++){
   icons[i] = new ImageIcon("icon/"+i+".png");
   icons[i].setImage(icons[i].getImage().getScaledInstance(50, 50, Image.SCALE_DEFAULT));
   icon_button[i] = new JButton(""+i, icons[i]);
   icon_button[i].addActionListener(this);
   dialogPane.add(icon_button[i]);
  }
  dialog.setBounds(200,266,266,280);
  dialog.show();
 }

 @Override
 public void actionPerformed(ActionEvent e) {
  /*构造emoji结构的消息发送*/
  String cmd = e.getActionCommand();
  System.out.println(cmd);
  dialog.dispose();
  client.sendMsg("<emoji>"+cmd+"</emoji>", "message");
 }

}

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