一个java局域网聊天的程序

一个java局域网聊天的程序

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

完整代码，请加我qq：3425385768