用Java启动一个telnet端口

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本文展示了如何使用Java的ServerSocketChannel和SocketChannel实现网络通信，包括绑定端口、接收客户端连接和处理数据传输的过程。

上代码：


import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Arrays;


public class Test {

    public static void main(String[] args) throws Exception {
        //使用 ServerSocketChannel 和 SocketChannel 网络
        ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
        InetSocketAddress inetSocketAddress = new InetSocketAddress(8000);

        //绑定端口到socket ，并启动
        serverSocketChannel.socket().bind(inetSocketAddress);
        //创建buffer数组
        ByteBuffer[] byteBuffers = new ByteBuffer[1];
        byteBuffers[0] = ByteBuffer.allocate(1024);

        //等待客户端连接(telnet)
        SocketChannel socketChannel = serverSocketChannel.accept();
        //假定从客户端接受8个字节
        int messageLength = 8;
        //循环的读取
        while (true) {
                long r = socketChannel.read(byteBuffers);
                Arrays.asList(byteBuffers)
                        .stream()
                        .map(byteBuffer -> {
                           // "position=" + byteBuffer.position() + ", limit=" + byteBuffer.limit();
                            byteBuffer.flip();
                            byte[] bytes = new byte[byteBuffer.remaining()];
                            byteBuffer.get(bytes);
                            return new String(bytes);
                        })
                        .forEach(System.out::println);
            //将所有的buffer进行flip
            Arrays.asList(byteBuffers).forEach(byteBuffer -> byteBuffer.flip());
            //将所有的buffer 进行clear
            Arrays.asList(byteBuffers).forEach(buffer -> {
                buffer.clear();
            });
        }
    }
}