Java 関数ライブラリで一般的に使用されるネットワーク通信ツールは何ですか?

// 客户端 import java.net.*; public class SocketClient { public static void main(String[] args) throws Exception { // 创建 Socket 并连接到服务器 Socket socket = new Socket("localhost", 8080); // 获取输出流并发送消息 DataOutputStream out = new DataOutputStream(socket.getOutputStream()); out.writeUTF("Hello from client!"); // 关闭输出流和 Socket out.close(); socket.close(); } } // 服务器 import java.net.*; public class SocketServer { public static void main(String[] args) throws Exception { // 创建 ServerSocket 并侦听连接 ServerSocket serverSocket = new ServerSocket(8080); while (true) { // 接受客户端连接 Socket clientSocket = serverSocket.accept(); // 获取输入流并读取消息 DataInputStream in = new DataInputStream(clientSocket.getInputStream()); String message = in.readUTF(); System.out.println("Received message: " + message); // 关闭输入流和 Socket in.close(); clientSocket.close(); } } }

// 服务器 import java.net.*; import java.nio.*; import java.nio.channels.*; public class NonBlockingServerSocket { public static void main(String[] args) throws Exception { // 创建 ServerSocketChannel 并绑定到端口 ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); serverSocketChannel.bind(new InetSocketAddress(8080)); serverSocketChannel.configureBlocking(false); // 创建 Selector 并注册 ServerSocketChannel Selector selector = Selector.open(); serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT); while (true) { // 侦听可用的选择键 int readyKeys = selector.select(); if (readyKeys == 0) { continue; } // 处理可用的选择键 Iterator keys = selector.selectedKeys().iterator(); while (keys.hasNext()) { SelectionKey key = keys.next(); keys.remove(); // 处理可接受的键 if (key.isAcceptable()) { SocketChannel clientSocketChannel = serverSocketChannel.accept(); clientSocketChannel.configureBlocking(false); clientSocketChannel.register(selector, SelectionKey.OP_READ); } // 处理可读的键 else if (key.isReadable()) { // ... } } } } }