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服务端程序：
package com.bh.server;import java.io.IOException;import java.net.InetSocketAddress; import java.net.ServerSocket; 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.nio.charset.Charset;import java.nio.charset.CharsetDecoder;import java.text.SimpleDateFormat;import java.util.Date;import java.util.HashMap; import java.util.Map; import java.util.Set; /** * @author cyq * NIO通讯服务端 */public class NIOSServer { private int port = 8888; //解码buffer private CharsetDecoder decode = Charset.forName("UTF-8").newDecoder(); /*发送数据缓冲区*/ private ByteBuffer sBuffer = ByteBuffer.allocate(1024); /*接受数据缓冲区*/ private ByteBuffer rBuffer = ByteBuffer.allocate(1024); /*映射客户端channel */ private Map clientsMap = new HashMap (); private Selector selector; private SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss", java.util.Locale.US); public NIOSServer(){ try { init(); listen(); } catch (Exception e) { e.printStackTrace(); } } private void init() throws IOException{ /* *启动服务器端，配置为非阻塞，绑定端口，注册accept事件 *ACCEPT事件：当服务端收到客户端连接请求时，触发该事件 */ ServerSocketChannel serverSocketChannel = ServerSocketChannel.open(); serverSocketChannel.configureBlocking(false); ServerSocket serverSocket = serverSocketChannel.socket(); serverSocket.bind(new InetSocketAddress(port)); selector = Selector.open(); serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT); System.out.println("server start on port:"+port); } /** * 服务器端轮询监听，select方法会一直阻塞直到有相关事件发生或超时 */ private void listen(){ while (true) { try { selector.select();//返回值为本次触发的事件数 Set selectionKeys = selector.selectedKeys(); for(SelectionKey key : selectionKeys){ handle(key); } selectionKeys.clear();//清除处理过的事件 } catch (Exception e) { e.printStackTrace(); break; } } } /** * 处理不同的事件 */ private void handle(SelectionKey selectionKey) throws IOException { ServerSocketChannel server = null; SocketChannel client = null; String receiveText=null; int count=0; if (selectionKey.isAcceptable()) { /* * 客户端请求连接事件 * serversocket为该客户端建立socket连接，将此socket注册READ事件，监听客户端输入 * READ事件：当客户端发来数据，并已被服务器控制线程正确读取时，触发该事件 */ server = (ServerSocketChannel) selectionKey.channel(); client = server.accept(); client.configureBlocking(false); client.register(selector, SelectionKey.OP_READ); } else if (selectionKey.isReadable()) { /* * READ事件，收到客户端发送数据，读取数据后继续注册监听客户端 */ client = (SocketChannel) selectionKey.channel(); rBuffer.clear(); count = client.read(rBuffer); if (count > 0) { rBuffer.flip(); receiveText = decode.decode(rBuffer.asReadOnlyBuffer()).toString(); System.out.println(client.toString()+":"+receiveText); sBuffer.clear(); sBuffer.put((sdf.format(new Date())+"服务器收到你的消息").getBytes()); sBuffer.flip(); client.write(sBuffer); dispatch(client, receiveText); client = (SocketChannel) selectionKey.channel(); client.register(selector, SelectionKey.OP_READ); } } } /** * 把当前客户端信息 推送到其他客户端 */ private void dispatch(SocketChannel client,String info) throws IOException{ Socket s = client.socket(); String name = "["+s.getInetAddress().toString().substring(1)+":"+Integer.toHexString(client.hashCode())+"]"; if(!clientsMap.isEmpty()){ for(Map.Entry entry : clientsMap.entrySet()){ SocketChannel temp = entry.getValue(); if(!client.equals(temp)){ sBuffer.clear(); sBuffer.put((name+":"+info).getBytes()); sBuffer.flip(); //输出到通道 temp.write(sBuffer); } } } clientsMap.put(name, client); } public static void main(String[] args) throws IOException { new NIOSServer(); } } 客户端程序: package com.bh.client;
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.InetSocketAddress; import java.nio.ByteBuffer; import java.nio.channels.SelectionKey; import java.nio.channels.Selector; import java.nio.channels.SocketChannel; import java.nio.charset.Charset; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Set;public class NIOClient {
/*发送数据缓冲区*/private static ByteBuffer sBuffer = ByteBuffer.allocate(1024);/*接受数据缓冲区*/private static ByteBuffer rBuffer = ByteBuffer.allocate(1024);/*服务器端地址*/private InetSocketAddress SERVER;private Selector selector;private SocketChannel client;private String receiveText;private String sendText;private int count=0;private Charset charset = Charset.forName("UTF-8");private SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss", java.util.Locale.US);public NIOClient(){ SERVER = new InetSocketAddress("localhost", 8888); init();}/** * */public void init(){ try { /* * 客户端向服务器端发起建立连接请求 */ SocketChannel socketChannel = SocketChannel.open(); socketChannel.configureBlocking(false); selector = Selector.open(); socketChannel.register(selector, SelectionKey.OP_CONNECT); socketChannel.connect(SERVER); /* * 轮询监听客户端上注册事件的发生 */ while (true) { selector.select(); Set keySet = selector.selectedKeys(); for(final SelectionKey key : keySet){ handle(key); } keySet.clear(); } } catch (Exception e) { e.printStackTrace(); }}public static void main(String[] args) throws IOException { new NIOClient(); } /** * @param selectionKey * @throws IOException * @throws ParseException */private void handle(SelectionKey selectionKey) throws IOException, ParseException{ if (selectionKey.isConnectable()) { /* * 连接建立事件，已成功连接至服务器 */ client = (SocketChannel) selectionKey.channel(); if (client.isConnectionPending()) { client.finishConnect(); System.out.println("connect success !"); sBuffer.clear(); sBuffer.put((sdf.format(new Date())+" connected!").getBytes()); sBuffer.flip(); client.write(sBuffer);//发送信息至服务器 /* 原文来自 站长网 * 启动线程一直监听客户端输入，有信心输入则发往服务器端 * 因为输入流是阻塞的，所以单独线程监听 */ new Thread(){ @Override public void run() { while(true){ try { sBuffer.clear(); InputStreamReader input = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(input); sendText = br.readLine(); /* * 未注册WRITE事件，因为大部分时间channel都是可以写的 */ sBuffer.put(charset.encode(sendText.trim())); sBuffer.flip(); client.write(sBuffer); } catch (IOException e) { e.printStackTrace(); break; } } } }.start(); } //注册读事件 client.register(selector, SelectionKey.OP_READ); } else if (selectionKey.isReadable()) { /* * 读事件触发 * 有从服务器端发送过来的信息，读取输出到屏幕上后，继续注册读事件 * 监听服务器端发送信息 */ client = (SocketChannel) selectionKey.channel(); rBuffer.clear(); count=client.read(rBuffer); if(count>0){ receiveText = new String( rBuffer.array(),0,count); System.out.println(receiveText); client = (SocketChannel) selectionKey.channel(); client.register(selector, SelectionKey.OP_READ); } } } } 无意中发现了一个巨牛的人工智能教程，忍不住分享一下给大家。教程不仅是零基础，通俗易懂，而且非常风趣幽默，像看小说一样！觉得太牛了，所以分享给大家。可以跳转到教程。
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