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public class GroupChatServer {
// 定义属性
private Selector selector;
private ServerSocketChannel listenChannel;
private static final int PORT = 6667;
// 构造器
// 初始化工作
public GroupChatServer() {
try {
// 得到选择器
selector = Selector.open();
// ServerSocketChannel
listenChannel = ServerSocketChannel.open();
// 绑定端口
listenChannel.socket().bind(new InetSocketAddress(PORT));
// 设置非阻塞模式
listenChannel.configureBlocking(false);
// 将该 listenChannel 注册到 selector
listenChannel.register(selector, SelectionKey.OP_ACCEPT);
} catch (IOException e) {
e.printStackTrace();
}
}
// 监听
public void listen() {
try {
// 循环处理
while (true) {
int count = selector.select();
if (count > 0) { // 有事件处理
// 遍历得到 selectionKey 集合
Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
while (iterator.hasNext()) {
// 取出 selectionKey
SelectionKey key = iterator.next();
// 监听到 accept
if (key.isAcceptable()) {
SocketChannel sc = listenChannel.accept();
sc.configureBlocking(false);
// 将该 sc 注册到 selector
sc.register(selector, SelectionKey.OP_READ);
System.out.println(sc.getRemoteAddress() + " 上线");
}
if (key.isReadable()) { // 通道发生 read 事件，即通道是可读的状态
// 处理读的事件（专门写方法...）
readData(key);
}
// 当前的 key 删除，防止重复处理
iterator.remove();
}
} else {
System.out.println("等待.....");
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
// 读取客户端消息
private void readData(SelectionKey key) {
// 定义一个 SocketChannel
SocketChannel channel = null;
try {
// 得到 channel
channel = (SocketChannel) key.channel();
// 创建 buffer
ByteBuffer buffer = ByteBuffer.allocate(1024);
int count = channel.read(buffer);
// 根据 count 的值做处理
if (count > 0) {
// 把缓冲区的数据转成字符串
String msg = new String(buffer.array());
// 输出该消息
System.out.println("from 客户端：" + msg);
// 向其他客户端转发消息（专门写方法...）
sendInfoToOtherClients(msg, channel);
}
} catch (IOException e) {
try {
System.out.println(channel.getRemoteAddress() + " 离线了...");
// 取消注册
key.cancel();
// 关闭通道
channel.close();
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
// 转发消息给其他客户（通道）
private void sendInfoToOtherClients(String msg, SocketChannel self) throws IOException {
System.out.println("服务器转发消息中...");
// 遍历所有注册到 selector 上的 SocketChannel，并排除 self
for (SelectionKey key : selector.keys()) {
// 通过 key 取出对应的 SocketChannel
Channel targetChannel = key.channel();
// 排除自己
if (targetChannel instanceof SocketChannel && targetChannel != self) {
// 转型
SocketChannel dest = (SocketChannel) targetChannel;
// 将 msg 存储到 buffer
ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes());
// 将 buffer 的数据写入通道
dest.write(buffer);
}
}
}
public static void main(String[] args) {
// 创建服务器对象
GroupChatServer groupChatServer = new GroupChatServer();
groupChatServer.listen();
}
}
public class GroupChatClient {
private final Selector selector;
private final SocketChannel socketChannel;
private final String username;
// 构造器，完成初始化
public GroupChatClient() throws IOException {
selector = Selector.open();
// 连接服务器
// 定义属性
String HOST = "127.0.0.1";
int PORT = 6667;
socketChannel = SocketChannel.open(new InetSocketAddress(HOST, PORT));
// 设置非阻塞
socketChannel.configureBlocking(false);
// 将 channel 注册到 selector
socketChannel.register(selector, SelectionKey.OP_READ);
// 得到 username
username = socketChannel.getLocalAddress().toString().substring(1);
System.out.println(username + " is ok...");
}
// 向服务器发送消息
public void sendInfo(String info) {
info = username + " 说：" + info;
try {
socketChannel.write(ByteBuffer.wrap(info.getBytes()));
} catch (IOException e) {
e.printStackTrace();
}
}
// 读取从服务器端回复的消息
public void readInfo() {
try {
int readChannels = selector.select();
if (readChannels > 0) { // 有可以用的通道
Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
while (iterator.hasNext()) {
SelectionKey key = iterator.next();
if (key.isReadable()) {
// 得到相关的通道
SocketChannel sc = (SocketChannel) key.channel();
// 得到一个 Buffer
ByteBuffer buffer = ByteBuffer.allocate(1024);
// 读取
sc.read(buffer);
// 把读到的缓冲区的数据转换成字符串
String msg = new String(buffer.array());
System.out.println(msg.trim());
}
}
iterator.remove(); // 删除当前的 selectionKey, 防止重复操作
} // System.out.println("没有可用的通道...");
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
// 启动客户端
GroupChatClient chatClient = new GroupChatClient();
// 启动一个线程, 每隔3秒，读取从服务器发送的数据
new Thread(() -> {
while (true) {
chatClient.readInfo();
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
// 发送数据给服务器端
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
String s = scanner.nextLine();
chatClient.sendInfo(s);
}
}
}
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