java BIO NIO AIO

本文主要是介绍java BIO NIO AIO，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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在Java中，I/O（输入/输出）操作主要有三种模型：BIO（Blocking I/O，阻塞I/O）、NIO（Non-blocking I/O，非阻塞I/O）和AIO（Asynchronous I/O，异步I/O）。这三种模型在处理I/O操作时的工作方式和适用场景各不相同。下面对它们进行详细介绍：
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// 服务器端
ServerSocket serverSocket = new ServerSocket(8080);
while (true) {Socket clientSocket = serverSocket.accept(); // 阻塞等待连接new Thread(() -> {try {BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));String message = in.readLine();System.out.println("Received: " + message);clientSocket.close();} catch (IOException e) {e.printStackTrace();}}).start();
}// 客户端
Socket socket = new Socket("localhost", 8080);
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
out.println("Hello, Server!");
socket.close();

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import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.*;public class NioServer {public static void main(String[] args) throws IOException {// 打开ServerSocketChannelServerSocketChannel serverChannel = ServerSocketChannel.open();serverChannel.configureBlocking(false);serverChannel.socket().bind(new InetSocketAddress(8080));// 打开SelectorSelector selector = Selector.open();serverChannel.register(selector, SelectionKey.OP_ACCEPT);ByteBuffer buffer = ByteBuffer.allocate(256);while (true) {selector.select(); // 阻塞直到有事件for (SelectionKey key : selector.selectedKeys()) {if (key.isAcceptable()) {// 接受连接ServerSocketChannel srvChannel = (ServerSocketChannel) key.channel();SocketChannel client = srvChannel.accept();client.configureBlocking(false);client.register(selector, SelectionKey.OP_READ);} else if (key.isReadable()) {// 读取数据SocketChannel client = (SocketChannel) key.channel();buffer.clear();int bytesRead = client.read(buffer);if (bytesRead == -1) {client.close();} else {buffer.flip();byte[] data = new byte[buffer.limit()];buffer.get(data);System.out.println("Received: " + new String(data));}}}selector.selectedKeys().clear();}}
}

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import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AsynchronousServerSocketChannel;
import java.nio.channels.AsynchronousSocketChannel;
import java.nio.channels.CompletionHandler;
import java.util.concurrent.Future;public class AioServer {public static void main(String[] args) throws IOException {final AsynchronousServerSocketChannel serverChannel =AsynchronousServerSocketChannel.open().bind(new InetSocketAddress(8080));serverChannel.accept(null, new CompletionHandler<AsynchronousSocketChannel, Void>() {@Overridepublic void completed(AsynchronousSocketChannel client, Void attachment) {// 继续接受下一个连接serverChannel.accept(null, this);// 处理当前连接ByteBuffer buffer = ByteBuffer.allocate(1024);client.read(buffer, buffer, new CompletionHandler<Integer, ByteBuffer>() {@Overridepublic void completed(Integer bytesRead, ByteBuffer buf) {if (bytesRead == -1) {try {client.close();} catch (IOException e) {e.printStackTrace();}return;}buf.flip();byte[] data = new byte[buf.limit()];buf.get(data);System.out.println("Received: " + new String(data));buf.clear();client.read(buf, buf, this);}@Overridepublic void failed(Throwable exc, ByteBuffer buf) {try {client.close();} catch (IOException e) {e.printStackTrace();}}});}@Overridepublic void failed(Throwable exc, Void attachment) {System.err.println("Failed to accept a connection.");exc.printStackTrace();}});// 阻止主线程退出try {Thread.currentThread().join();} catch (InterruptedException e) {e.printStackTrace();}}
}