Java NIO多人聊天室
红字V 人气:0NIO服务端
public class NioServer {
/**
* 启动
*/
public void start() throws IOException {
/**
* 1. 创建Selector
*/
Selector selector = Selector.open();
/**
* 2. 通过ServerSocketChannel创建channel通道
*/
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
/**
* 3. 为channel通道绑定监听端口
*/
serverSocketChannel.bind(new InetSocketAddress(8000));
/**
* 4. **设置channel为非阻塞模式**
*/
serverSocketChannel.configureBlocking(false);
/**
* 5. 将channel注册到selector上，监听连接事件
*/
serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
System.out.println("服务器启动成功！");
/**
* 6. 循环等待新接入的连接
*/
for (;;) { // while(true) c for;;
/**
* TODO 获取可用channel数量
*/
int readyChannels = selector.select();
/**
* TODO 为什么要这样！！？
*/
if (readyChannels == 0) continue;
/**
* 获取可用channel的集合
*/
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator iterator = selectionKeys.iterator();
while (iterator.hasNext()) {
/**
* selectionKey实例
*/
SelectionKey selectionKey = (SelectionKey) iterator.next();
/**
* **移除Set中的当前selectionKey**
*/
iterator.remove();
/**
* 7. 根据就绪状态，调用对应方法处理业务逻辑
*/
/**
* 如果是 接入事件
*/
if (selectionKey.isAcceptable()) {
acceptHandler(serverSocketChannel, selector);
}
/**
* 如果是 可读事件
*/
if (selectionKey.isReadable()) {
readHandler(selectionKey, selector);
}
}
}
}
/**
* 接入事件处理器
*/
private void acceptHandler(ServerSocketChannel serverSocketChannel,
Selector selector)
throws IOException {
/**
* 如果要是接入事件，创建socketChannel
*/
SocketChannel socketChannel = serverSocketChannel.accept();
/**
* 将socketChannel设置为非阻塞工作模式
*/
socketChannel.configureBlocking(false);
/**
* 将channel注册到selector上，监听 可读事件
*/
socketChannel.register(selector, SelectionKey.OP_READ);
/**
* 回复客户端提示信息
*/
socketChannel.write(Charset.forName("UTF-8")
.encode("你与聊天室里其他人都不是朋友关系，请注意隐私安全"));
}
/**
* 可读事件处理器
*/
private void readHandler(SelectionKey selectionKey, Selector selector)
throws IOException {
/**
* 要从 selectionKey 中获取到已经就绪的channel
*/
SocketChannel socketChannel = (SocketChannel) selectionKey.channel();
/**
* 创建buffer
*/
ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
/**
* 循环读取客户端请求信息
*/
String request = "";
while (socketChannel.read(byteBuffer) > 0) {
/**
* 切换buffer为读模式
*/
byteBuffer.flip();
/**
* 读取buffer中的内容
*/
request += Charset.forName("UTF-8").decode(byteBuffer);
}
/**
* 将channel再次注册到selector上，监听他的可读事件
*/
socketChannel.register(selector, SelectionKey.OP_READ);
/**
* 将客户端发送的请求信息 广播给其他客户端
*/
if (request.length() > 0) {
// 广播给其他客户端
broadCast(selector, socketChannel, request);
}
}
/**
* 广播给其他客户端
*/
private void broadCast(Selector selector,
SocketChannel sourceChannel, String request) {
/**
* 获取到所有已接入的客户端channel
*/
Set<SelectionKey> selectionKeySet = selector.keys();
/**
* 循环向所有channel广播信息
*/
selectionKeySet.forEach(selectionKey -> {
Channel targetChannel = selectionKey.channel();
// 剔除发消息的客户端
if (targetChannel instanceof SocketChannel
&& targetChannel != sourceChannel) {
try {
// 将信息发送到targetChannel客户端
((SocketChannel) targetChannel).write(
Charset.forName("UTF-8").encode(request));
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
/**
* 主方法
* @param args
*/
public static void main(String[] args) throws IOException {
new NioServer().start();
}
}
NIO客户端
public class NioClient {
/**
* 启动
*/
public void start(String nickname) throws IOException {
/**
* 连接服务器端
*/
SocketChannel socketChannel = SocketChannel.open(
new InetSocketAddress("127.0.0.1", 8000));
/**
* 接收服务器端响应
*/
// 新开线程，专门负责来接收服务器端的响应数据
// selector ， socketChannel ， 注册
Selector selector = Selector.open();
socketChannel.configureBlocking(false);
socketChannel.register(selector, SelectionKey.OP_READ);
new Thread(new NioClientHandler(selector)).start();
/**
* 向服务器端发送数据
*/
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
String request = scanner.nextLine();
if (request != null && request.length() > 0) {
socketChannel.write(
Charset.forName("UTF-8")
.encode(nickname + " : " + request));
}
}
}
public static void main(String[] args) throws IOException {
// new NioClient().start();
}
}
客户端线程，处理服务器端响应的的消息
public class NioClientHandler implements Runnable {
private Selector selector;
public NioClientHandler(Selector selector) {
this.selector = selector;
}
@Override
public void run() {
try {
for (;;) {
int readyChannels = selector.select();
if (readyChannels == 0) continue;
/**
* 获取可用channel的集合
*/
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator iterator = selectionKeys.iterator();
while (iterator.hasNext()) {
/**
* selectionKey实例
*/
SelectionKey selectionKey = (SelectionKey) iterator.next();
/**
* **移除Set中的当前selectionKey**
*/
iterator.remove();
/**
* 7. 根据就绪状态，调用对应方法处理业务逻辑
*/
/**
* 如果是 可读事件
*/
if (selectionKey.isReadable()) {
readHandler(selectionKey, selector);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 可读事件处理器
*/
private void readHandler(SelectionKey selectionKey, Selector selector)
throws IOException {
/**
* 要从 selectionKey 中获取到已经就绪的channel
*/
SocketChannel socketChannel = (SocketChannel) selectionKey.channel();
/**
* 创建buffer
*/
ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
/**
* 循环读取服务器端响应信息
*/
String response = "";
while (socketChannel.read(byteBuffer) > 0) {
/**
* 切换buffer为读模式
*/
byteBuffer.flip();
/**
* 读取buffer中的内容
*/
response += Charset.forName("UTF-8").decode(byteBuffer);
}
/**
* 将channel再次注册到selector上，监听他的可读事件
*/
socketChannel.register(selector, SelectionKey.OP_READ);
/**
* 将服务器端响应信息打印到本地
*/
if (response.length() > 0) {
System.out.println(response);
}
}
}
我们定义三个客户端，模拟三个用户在聊天室发送消息
public class AClient {
public static void main(String[] args)
throws IOException {
new NioClient().start("AClient");
}
}
public class BClient {
public static void main(String[] args)
throws IOException {
new NioClient().start("BClient");
}
}
public class CClient {
public static void main(String[] args)
throws IOException {
new NioClient().start("CClient");
}
}
NIO 聊天室到此结束
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