java简单BIO示例

服务端

public class TCPServer {

    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(10000);
        while (true) {
            Socket socket = serverSocket.accept();// 阻塞
            InputStream inputStream = socket.getInputStream();
            byte[] bytes = new byte[100];
            inputStream.read(bytes);// 阻塞
            System.out.println(socket.getInetAddress() + ":" + socket.getPort() + "说" + new String(bytes));
            OutputStream outputStream = socket.getOutputStream();
            outputStream.write("我是服务端".getBytes());
            socket.close();
        }
    }

}

客户端

public class TCPClient {

    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 10000);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("我是客户端".getBytes());
        InputStream inputStream = socket.getInputStream();
        byte[] bytes = new byte[100];
        inputStream.read(bytes);// 阻塞
        System.out.println("服务端说：" + new String(bytes));
        socket.close();
    }

}

先启动服务端，后启动客户端进行测试