这篇文章主要讲解了“JavaNIO实现聊天室功能代码实例”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“JavaNIO实现聊天室功能代码实例”吧！

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一、服务器端

package com.chat.server;import java.io.IOException;import java.net.InetSocketAddress;import java.nio.ByteBuffer;import java.nio.channels.SelectionKey;import java.nio.channels.Selector;import java.nio.channels.ServerSocketChannel;import java.nio.channels.SocketChannel;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Iterator;import java.util.Vector;/** * 聊天室:服务端 * @author zing *  */public class ChatServer implements Runnable {    //选择器    private Selector selector;    //注册ServerSocketChannel后的选择键    private SelectionKey serverKey;    //标识是否运行    private boolean isRun;    //当前聊天室中的用户名称列表    private Vector unames;    //时间格式化器    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    /**     * 构造函数     * @param port 服务端监控的端口号     */    public ChatServer(int port) {        isRun = true;        unames = new Vector();        init(port);    }    /**     * 初始化选择器和服务器套接字     *      * @param port 服务端监控的端口号     */    private void init(int port) {        try {            //获得选择器实例            selector = Selector.open();            //获得服务器套接字实例            ServerSocketChannel serverChannel = ServerSocketChannel.open();            //绑定端口号            serverChannel.socket().bind(new InetSocketAddress(port));            //设置为非阻塞            serverChannel.configureBlocking(false);            //将ServerSocketChannel注册到选择器，指定其行为为"等待接受连接"            serverKey = serverChannel.register(selector, SelectionKey.OP_ACCEPT);            printInfo("server starting...");        } catch (IOException e) {            e.printStackTrace();        }    }    @Override    public void run() {        try {            //轮询选择器选择键            while (isRun) {                //选择一组已准备进行IO操作的通道的key，等于1时表示有这样的key                int n = selector.select();                if (n > 0) {                    //从选择器上获取已选择的key的集合并进行迭代                    Iterator iter = selector.selectedKeys().iterator();                    while (iter.hasNext()) {                        SelectionKey key = iter.next();                        //若此key的通道是等待接受新的套接字连接                        if (key.isAcceptable()) {                            //记住一定要remove这个key，否则之后的新连接将被阻塞无法连接服务器                            iter.remove();                            //获取key对应的通道                            ServerSocketChannel serverChannel = (ServerSocketChannel) key.channel();                            //接受新的连接返回和客户端对等的套接字通道                            SocketChannel channel = serverChannel.accept();                            if (channel == null) {                                continue;                            }                            //设置为非阻塞                            channel.configureBlocking(false);                            //将这个套接字通道注册到选择器，指定其行为为"读"                            channel.register(selector, SelectionKey.OP_READ);                        }                        //若此key的通道的行为是"读"                        if (key.isReadable()) {                            readMsg(key);                        }                        //若次key的通道的行为是"写"                        if (key.isWritable()) {                            writeMsg(key);                        }                    }                }            }        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 从key对应的套接字通道上读数据     * @param key 选择键     * @throws IOException     */    private void readMsg(SelectionKey key) throws IOException {        //获取此key对应的套接字通道        SocketChannel channel = (SocketChannel) key.channel();        //创建一个大小为1024k的缓存区        ByteBuffer buffer = ByteBuffer.allocate(1024);        StringBuffer sb = new StringBuffer();        //将通道的数据读到缓存区        int count = channel.read(buffer);        if (count > 0) {            //翻转缓存区(将缓存区由写进数据模式变成读出数据模式)            buffer.flip();            //将缓存区的数据转成String            sb.append(new String(buffer.array(), 0, count));        }        String str = sb.toString();        //若消息中有"open_"，表示客户端准备进入聊天界面        //客户端传过来的数据格式是"open_zing"，表示名称为zing的用户请求打开聊天窗体        //用户名称列表有更新，则应将用户名称数据写给每一个已连接的客户端        if (str.indexOf("open_") != -1) {//客户端连接服务器            String name = str.substring(5);            printInfo(name + " online");            unames.add(name);            //获取选择器已选择的key并迭代            Iterator iter = selector.selectedKeys().iterator();            while (iter.hasNext()) {                SelectionKey selKey = iter.next();                //若不是服务器套接字通道的key，则将数据设置到此key中                //并更新此key感兴趣的动作                if (selKey != serverKey) {                    selKey.attach(unames);                    selKey.interestOps(selKey.interestOps() | SelectionKey.OP_WRITE);                }            }        } else if (str.indexOf("exit_") != -1) {// 客户端发送退出命令            String uname = str.substring(5);            //删除此用户名称            unames.remove(uname);            //将"close"字符串附加到key            key.attach("close");            //更新此key感兴趣的动作            key.interestOps(SelectionKey.OP_WRITE);            //获取选择器上的已选择的key并迭代            //将更新后的名称列表数据附加到每个套接字通道key上,并重设key感兴趣的操作            Iterator iter = key.selector().selectedKeys().iterator();            while (iter.hasNext()) {                SelectionKey selKey = iter.next();                if (selKey != serverKey && selKey != key) {                    selKey.attach(unames);                    selKey.interestOps(selKey.interestOps() | SelectionKey.OP_WRITE);                }            }            printInfo(uname + " offline");        } else {// 读取客户端聊天消息            String uname = str.substring(0, str.indexOf("^"));            String msg = str.substring(str.indexOf("^") + 1);            printInfo("("+uname+")说：" + msg);            String dateTime = sdf.format(new Date());            String smsg = uname + " " + dateTime + "\n " + msg + "\n";            Iterator iter = selector.selectedKeys().iterator();            while (iter.hasNext()) {                SelectionKey selKey = iter.next();                if (selKey != serverKey) {                    selKey.attach(smsg);                    selKey.interestOps(selKey.interestOps() | SelectionKey.OP_WRITE);                }            }        }    }    /**     * 写数据到key对应的套接字通道     * @param key     * @throws IOException     */    private void writeMsg(SelectionKey key) throws IOException {        SocketChannel channel = (SocketChannel) key.channel();        Object obj = key.attachment();        //这里必要要将key的附加数据设置为空，否则会有问题        key.attach("");        //附加值为"close"，则取消此key，并关闭对应通道        if (obj.toString().equals("close")) {            key.cancel();            channel.socket().close();            channel.close();            return;        }else {            //将数据写到通道            channel.write(ByteBuffer.wrap(obj.toString().getBytes()));        }        //重设此key兴趣        key.interestOps(SelectionKey.OP_READ);    }    private void printInfo(String str) {        System.out.println("[" + sdf.format(new Date()) + "] -> " + str);    }    public static void main(String[] args) {        ChatServer server = new ChatServer(19999);        new Thread(server).start();    }}

二、客户端

1、服务类，用于与服务端交互

package com.chat.client;import java.io.IOException;import java.net.InetSocketAddress;import java.nio.ByteBuffer;import java.nio.channels.SocketChannel;public class ClientService {    private static final String HOST = "127.0.0.1";    private static final int PORT = 19999;    private static SocketChannel sc;    private static Object lock = new Object();    private static ClientService service;    public static ClientService getInstance(){        synchronized (lock) {            if(service == null){                try {                    service = new ClientService();                } catch (IOException e) {                    e.printStackTrace();                }            }            return service;        }    }    private ClientService() throws IOException {        sc = SocketChannel.open();        sc.configureBlocking(false);        sc.connect(new InetSocketAddress(HOST, PORT));    }    public void sendMsg(String msg) {        try {            while (!sc.finishConnect()) {            }            sc.write(ByteBuffer.wrap(msg.getBytes()));        } catch (IOException e) {            e.printStackTrace();        }    }    public String receiveMsg() {        ByteBuffer buffer = ByteBuffer.allocate(1024);        buffer.clear();        StringBuffer sb = new StringBuffer();        int count = 0;        String msg = null;        try {            while ((count = sc.read(buffer)) > 0) {                sb.append(new String(buffer.array(), 0, count));            }            if (sb.length() > 0) {                msg = sb.toString();                if ("close".equals(sb.toString())) {                    msg = null;                    sc.close();                    sc.socket().close();                }            }        } catch (IOException e) {            e.printStackTrace();        }        return msg;    }}

2、登陆窗体，用户设置名称

package com.chat.client;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JTextField;/** * 设置名称窗体 *  * @author zing *  */public class SetNameFrame extends JFrame {    private static final long serialVersionUID = 1L;    private static JTextField txtName;// 文本框    private static JButton btnOK;// ok按钮    private static JLabel label;// 标签    public SetNameFrame() {        this.setLayout(null);        Toolkit kit = Toolkit.getDefaultToolkit();        int w = kit.getScreenSize().width;        int h = kit.getScreenSize().height;        this.setBounds(w / 2 - 230 / 2, h / 2 - 200 / 2, 230, 200);        this.setTitle("设置名称");        this.setDefaultCloseOperation(EXIT_ON_CLOSE);        this.setResizable(false);        txtName = new JTextField(4);        this.add(txtName);        txtName.setBounds(10, 10, 100, 25);        btnOK = new JButton("OK");        this.add(btnOK);        btnOK.setBounds(120, 10, 80, 25);        label = new JLabel("[w:" + w + ",h:" + h + "]");        this.add(label);        label.setBounds(10, 40, 200, 100);        label.setText("在上面的文本框中输入名字
显示器宽度：" + w + "
显示器高度：" + h                + "");        btnOK.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                String uname = txtName.getText();                ClientService service = ClientService.getInstance();                ChatFrame chatFrame = new ChatFrame(service, uname);                chatFrame.show();                setVisible(false);            }        });    }    public static void main(String[] args) {        SetNameFrame setNameFrame = new SetNameFrame();        setNameFrame.setVisible(true);    }}

3、聊天室窗体

package com.chat.client;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.DefaultListModel;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JList;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;/** * 聊天室窗体 * @author zing * */public class ChatFrame {    private JTextArea readContext = new JTextArea(18, 30);// 显示消息文本框    private JTextArea writeContext = new JTextArea(6, 30);// 发送消息文本框    private DefaultListModel modle = new DefaultListModel();// 用户列表模型    private JList list = new JList(modle);// 用户列表    private JButton btnSend = new JButton("发送");// 发送消息按钮    private JButton btnClose = new JButton("关闭");// 关闭聊天窗口按钮    private JFrame frame = new JFrame("ChatFrame");// 窗体界面    private String uname;// 用户姓名    private ClientService service;// 用于与服务器交互    private boolean isRun = false;// 是否运行    public ChatFrame(ClientService service, String uname) {        this.isRun = true;        this.uname = uname;        this.service = service;    }    // 初始化界面控件及事件    private void init() {        frame.setLayout(null);        frame.setTitle(uname + " 聊天窗口");        frame.setSize(500, 500);        frame.setLocation(400, 200);        //设置可关闭        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //不能改变窗体大小        frame.setResizable(false);        //聊天消息显示区带滚动条        JScrollPane readScroll = new JScrollPane(readContext);        readScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);        frame.add(readScroll);        //消息编辑区带滚动条        JScrollPane writeScroll = new JScrollPane(writeContext);        writeScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);        frame.add(writeScroll);        frame.add(list);        frame.add(btnSend);        frame.add(btnClose);        readScroll.setBounds(10, 10, 320, 300);        readContext.setBounds(0, 0, 320, 300);        readContext.setEditable(false);//设置为不可编辑        readContext.setLineWrap(true);// 自动换行        writeScroll.setBounds(10, 315, 320, 100);        writeContext.setBounds(0, 0, 320, 100);        writeContext.setLineWrap(true);// 自动换行        list.setBounds(340, 10, 140, 445);        btnSend.setBounds(150, 420, 80, 30);        btnClose.setBounds(250, 420, 80, 30);        //窗体关闭事件        frame.addWindowListener(new WindowAdapter() {            @Override            public void windowClosing(WindowEvent e) {                isRun = false;                service.sendMsg("exit_" + uname);                System.exit(0);            }        });        //发送按钮事件        btnSend.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                String msg = writeContext.getText().trim();                if(msg.length() > 0){                    service.sendMsg(uname + "^" + writeContext.getText());                }                //发送消息后，去掉编辑区文本，并获得光标焦点                writeContext.setText(null);                writeContext.requestFocus();            }        });        //关闭按钮事件        btnClose.addActionListener(new ActionListener() {            @Override            public void actionPerformed(ActionEvent e) {                isRun = false;                service.sendMsg("exit_" + uname);                System.exit(0);            }        });        //右边名称列表选择事件        list.addListSelectionListener(new ListSelectionListener() {            @Override            public void valueChanged(ListSelectionEvent e) {                // JOptionPane.showMessageDialog(null,                // list.getSelectedValue().toString());            }        });        //消息编辑区键盘按键事件        writeContext.addKeyListener(new KeyListener() {            @Override            public void keyTyped(KeyEvent e) {                // TODO Auto-generated method stub            }            //按下键盘按键后释放            @Override            public void keyReleased(KeyEvent e) {                //按下enter键发送消息                if(e.getKeyCode() == KeyEvent.VK_ENTER){                    String msg = writeContext.getText().trim();                    if(msg.length() > 0){                        service.sendMsg(uname + "^" + writeContext.getText());                    }                    writeContext.setText(null);                    writeContext.requestFocus();                }            }            @Override            public void keyPressed(KeyEvent e) {                // TODO Auto-generated method stub            }        });    }    // 此线程类用于轮询读取服务器发送的消息    private class MsgThread extends Thread {        @Override        public void run() {            while (isRun) {                String msg = service.receiveMsg();                if (msg != null) {                    //若是名称列表数据，则更新聊天窗体右边的列表                    if (msg.indexOf("[") != -1 && msg.lastIndexOf("]") != -1) {                        msg = msg.substring(1, msg.length() - 1);                        String[] userNames = msg.split(",");                        modle.removeAllElements();                        for (int i = 0; i < userNames.length; i++) {                            modle.addElement(userNames[i].trim());                        }                    } else {                        //将聊天数据设置到聊天消息显示区                        String str = readContext.getText() + msg;                        readContext.setText(str);                        readContext.selectAll();//保持滚动条在最下面                    }                }            }        }    }    // 显示界面    public void show() {        this.init();        service.sendMsg("open_" + uname);        MsgThread msgThread = new MsgThread();        msgThread.start();        this.frame.setVisible(true);    }}

感谢各位的阅读，以上就是“JavaNIO实现聊天室功能代码实例”的内容了，经过本文的学习后，相信大家对JavaNIO实现聊天室功能代码实例这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！

名称栏目：JavaNIO实现聊天室功能代码实例
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