package net.smgui.util;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

/**
 * Created by lutai on 2016/4/12.
 */
public class Server implements Runnable {

    private Selector selector;
    private ServerSocketChannel serverSocketChannel;
    private volatile boolean stop;
    public Server(int port) {
        try {
            selector = Selector.open();
            serverSocketChannel = ServerSocketChannel.open();
            serverSocketChannel.configureBlocking(false);
            serverSocketChannel.bind(new InetSocketAddress(port), 1024);
            serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
            System.out.println("伺服器在"+port+"啟動");
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
    public void stop() {
        this.stop = true;
    }
    public void run() {
        while (!stop) {
            try {
                selector.select();
                Set<SelectionKey> selectionKeys = selector.selectedKeys();
                Iterator<SelectionKey> iterator = selectionKeys.iterator();
                SelectionKey key = null;
                while (iterator.hasNext()) {
                    key = iterator.next();
                    iterator.remove();
                    try {
                        handleInput(key);
                    }
                    catch (Exception e) {
                        if (key != null) {
                            key.cancel();
                            if (key.channel() != null) {
                                key.channel().close();
                            }
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.exit(-1);
            }
        }
        if (selector != null) {
            try {
                selector.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    private void handleInput(SelectionKey key) throws IOException {
        if (key.isValid()) {
            if (key.isAcceptable()) {
                ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
                SocketChannel sc = ssc.accept();
                sc.configureBlocking(false);
                sc.register(selector, SelectionKey.OP_READ);
            }
            else if (key.isReadable()) {
                SocketChannel sc = (SocketChannel) key.channel();
                ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
                int readBytes = sc.read(byteBuffer);
                if (readBytes > 0) {
                    byteBuffer.flip();
                    byte[] bytes = new byte[byteBuffer.remaining()];
                    byteBuffer.get(bytes);
                    System.out.println(new String(bytes, "UTF-8"));
                    doWrite(sc);
                }
                else if (readBytes < 0) {
                    key.cancel();
                    sc.close();
                }
                else {

                }
            }
        }
    }
    private void doWrite(SocketChannel sc) throws IOException {
        byte[] bytes = "伺服器傳送訊息".getBytes();
        ByteBuffer byteBuffer = ByteBuffer.allocate(bytes.length);
        byteBuffer.put(bytes);
        byteBuffer.flip();
        sc.write(byteBuffer);
    }
}
 

package net.smgui.util;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

/**
 * Created by lutai on 2016/4/25.
 */
public class Client implements Runnable {

    private String host;
    private int port;
    private Selector selector;
    private SocketChannel socketChannel;
    private volatile boolean stop;

    public Client(String host, int port) {
        this.host = host;
        this.port = port;
        try {
            selector = Selector.open();
            socketChannel = SocketChannel.open();
            socketChannel.configureBlocking(false);
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }
    public void run() {
        try {
            doConnect();
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(-1);
        }
        while (!stop) {
            try {
                selector.select();
                Set<SelectionKey> selectionKeys = selector.selectedKeys();
                Iterator<SelectionKey> iterator = selectionKeys.iterator();
                SelectionKey key = null;
                while (iterator.hasNext()) {
                    key = iterator.next();
                    iterator.remove();
                    try {
                        handleInput(key);
                    }
                    catch (Exception e) {
                        if (key != null) {
                            key.cancel();
                            if (key.channel() != null) {
                                key.channel().close();
                            }
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.exit(-1);
            }
        }
        if (selector != null) {
            try {
                selector.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    private void handleInput(SelectionKey key) throws IOException {
        if (key.isValid()) {
            SocketChannel sc = (SocketChannel) key.channel();
            if (key.isConnectable()) {
                if (sc.finishConnect()) {
                    sc.register(selector, SelectionKey.OP_READ);
                    doWrite(sc);
                }
                else {
                    System.exit(-1);
                }
            }
            else if (key.isReadable()) {
                ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
                int readBytes = sc.read(byteBuffer);
                if (readBytes > 0) {
                    byteBuffer.flip();
                    byte[] bytes = new byte[byteBuffer.remaining()];
                    byteBuffer.get(bytes);
                    System.out.println(new String(bytes, "UTF-8"));
                    doWrite(sc);
                    this.stop = true;
                }
                else if (readBytes < 0) {
                    key.cancel();
                    sc.close();
                }
                else {

                }
            }
        }
    }
    private void doConnect() throws IOException {
        if (socketChannel.connect(new InetSocketAddress(host, port))) {
            socketChannel.register(selector, SelectionKey.OP_READ);
            doWrite(socketChannel);
        }
        else {
            socketChannel.register(selector, SelectionKey.OP_CONNECT);
        }
    }
    private void doWrite(SocketChannel sc) throws IOException {
        byte[] bytes = "客戶端傳送訊息".getBytes();
        ByteBuffer byteBuffer = ByteBuffer.allocate(bytes.length);
        byteBuffer.put(bytes);
        byteBuffer.flip();
        sc.write(byteBuffer);
        if (!byteBuffer.hasRemaining()) {
            System.out.println("傳送資料成功");
        }
    }
}