Java NIOチャットルームの例

最近Java NIOチャットルームのチャットのプログラムを书いて、NIOは勉强するのが比较的に困难で、私のコードはみんなに1つのレンガを投げて玉を引く作用を果たすことができます!
サービス:

package test.javanio; 

/** * @author * @version * CreateTime：2010-12-1   05:12:11 * Description： */ 
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.Date; 
import java.util.Iterator; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

public class MySocketServer implements Runnable {  

    private boolean running; 

    private Selector selector; 
    String writeMsg; 
    StringBuffer sb = new StringBuffer(); 
    SelectionKey ssckey; 

    public MySocketServer() {  

        running = true; 

    }  

    public void init() {  
        try {  
            selector = Selector.open(); 
            ServerSocketChannel ssc = ServerSocketChannel.open(); 
            ssc.configureBlocking(false); 
            ssc.socket().bind(new InetSocketAddress(2345)); 
            ssckey = ssc.register(selector, SelectionKey.OP_ACCEPT); 
            System.out.println("server is starting..." + new Date()); 
        } catch (IOException ex) {  
            Logger.getLogger(MySocketServer.class.getName()).log(Level.SEVERE,  
                    null, ex); 
        }  
    }  

    public static void main(String[] args) {  
        MySocketServer server = new MySocketServer(); 
        new Thread(server).start(); 

    }  

    public void execute() {  
        try {  
            while (running) {  
                int num = selector.select(); 
                if (num > 0) {  
                    Iterator<SelectionKey> it = selector.selectedKeys()  
                            .iterator(); 
                    while (it.hasNext()) {  
                        SelectionKey key = it.next(); 
                        it.remove(); 
                        if (!key.isValid())  
                            continue; 
                        if (key.isAcceptable()) {  
                            System.out.println("isAcceptable"); 
                            getConn(key); 
                        } else if (key.isReadable()) {  
                            System.out.println("isReadable"); 
                            readMsg(key); 
                        }  

                        else if (key.isValid() && key.isWritable()) {  
                            if (writeMsg != null) {  
                                System.out.println("isWritable"); 
                                writeMsg(key); 
                            }  

                        }  

                        else 
                            break; 

                    }  

                }  
                Thread.yield(); 
            }  

        } catch (IOException ex) {  
            Logger.getLogger(MySocketServer.class.getName()).log(Level.SEVERE,  
                    null, ex); 
        }  
    }  

    private void getConn(SelectionKey key) throws IOException {  
        ServerSocketChannel ssc = (ServerSocketChannel) key.channel(); 
        SocketChannel sc = ssc.accept(); 
        sc.configureBlocking(false); 
        sc.register(selector, SelectionKey.OP_READ); 
        System.out.println("build connection :" 
                + sc.socket().getRemoteSocketAddress()); 
    }  

    private void readMsg(SelectionKey key) throws IOException {  
        sb.delete(0, sb.length()); 
        SocketChannel sc = (SocketChannel) key.channel(); 
        System.out.print(sc.socket().getRemoteSocketAddress() + " "); 
        ByteBuffer buffer = ByteBuffer.allocate(1024); 
        buffer.clear(); 
        int len = 0; 
        StringBuffer sb = new StringBuffer(); 
        while ((len = sc.read(buffer)) > 0) {  
            buffer.flip(); 
            sb.append(new String(buffer.array(), 0, len)); 
        }  
        if (sb.length() > 0)  
            System.out.println("get from client:" + sb.toString()); 
        if (sb.toString().trim().toLowerCase().equals("quit")) {  
            sc.write(ByteBuffer.wrap("BYE".getBytes())); 
            System.out.println("client is closed " 
                    + sc.socket().getRemoteSocketAddress()); 
            key.cancel(); 
            sc.close(); 
            sc.socket().close(); 

        } else {  
            String toMsg = sc.socket().getRemoteSocketAddress() + "said:" 
                    + sb.toString(); 
            System.out.println(toMsg); 

            writeMsg = toMsg; 

            /* * Iterator<SelectionKey> it=key.selector().keys().iterator(); * * while(it.hasNext()){ SelectionKey skey=it.next(); * if(skey!=key&&skey!=ssckey){ SocketChannel client=(SocketChannel) * skey.channel(); client.write(ByteBuffer.wrap(toMsg.getBytes())); * } * * } */ 

            /* * * key.attach(toMsg); * key.interestOps(key.interestOps()|SelectionKey.OP_WRITE); */ 
            Iterator<SelectionKey> it = key.selector().keys().iterator(); 

            while (it.hasNext()) {  
                SelectionKey skey = it.next(); 
                if (skey != key && skey != ssckey) {  
                    if (skey.attachment() != null) {  
                        String str = (String) skey.attachment(); 
                        skey.attach(str + toMsg); 
                    } else {  
                        skey.attach(toMsg); 
                    }  
                    skey  
                            .interestOps(skey.interestOps()  
                                    | SelectionKey.OP_WRITE); 
                }  

            }  
            selector.wakeup();//      

        }  

    }  

    public void run() {  
        init(); 
        execute(); 
    }  

    private void writeMsg(SelectionKey key) throws IOException {  

        System.out.println("++++enter write+++"); 
        SocketChannel sc = (SocketChannel) key.channel(); 
        String str = (String) key.attachment(); 

        sc.write(ByteBuffer.wrap(str.getBytes())); 
        key.interestOps(SelectionKey.OP_READ); 
    }  
} 

クライアント:

package test.javanio;  

/** * @author * @version * CreateTime：2010-12-1   05:12:46 * Description： */ 
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStreamReader;  
import java.net.InetSocketAddress;  
import java.nio.ByteBuffer;  
import java.nio.channels.Selector;  
import java.nio.channels.SocketChannel;  
import java.util.logging.Level;  
import java.util.logging.Logger;  
import java.util.Currency.*;  

public class MySocketClient implements Runnable {  
    Selector selector;  

    boolean running;  

    SocketChannel sc;  

    public MySocketClient() {  
        running = true;  

    }  

    public void init() {  
        try {  
            sc = SocketChannel.open();  
            sc.configureBlocking(false);  
            sc.connect(new InetSocketAddress("localhost", 2345));  

        } catch (IOException ex) {  
            Logger.getLogger(MySocketClient.class.getName()).log(Level.SEVERE,  
                    null, ex);  
        }  
    }  

    public static void main(String[] args) {  

        MySocketClient client = new MySocketClient();  
        new Thread(client).start();  
    }  

    public void execute() {  

        int num = 0;  
        try {  
            while (!sc.finishConnect()) {  
            }  
        } catch (IOException ex) {  
            Logger.getLogger(MySocketClient.class.getName()).log(Level.SEVERE,  
                    null, ex);  
        }  

        ReadKeyBoard rkb = new ReadKeyBoard();  
        new Thread(rkb).start();  
        while (running) {  
            try {  

                ByteBuffer buffer = ByteBuffer.allocate(1024);  
                buffer.clear();  

                StringBuffer sb = new StringBuffer();  
                Thread.sleep(500);  

                while ((num = sc.read(buffer)) > 0) {  
                    sb.append(new String(buffer.array(), 0, num));  
                    buffer.clear();  
                }  
                if (sb.length() > 0)  
                    System.out.println(sb.toString());  
                if (sb.toString().toLowerCase().trim().equals("bye")) {  
                    System.out.println("closed....");  

                    sc.close();  
                    sc.socket().close();  
                    rkb.close();  
                    running = false;  
                }  
            } catch (InterruptedException ex) {  
                Logger.getLogger(MySocketClient.class.getName()).log(  
                        Level.SEVERE, null, ex);  
            } catch (IOException ex) {  
                Logger.getLogger(MySocketClient.class.getName()).log(  
                        Level.SEVERE, null, ex);  
            }  
        }  

    }  

    public void run() {  
        init();  
        execute();  
    }  

    class ReadKeyBoard implements Runnable {  

        boolean running2 = true;  

        public ReadKeyBoard() {  

        }  

        public void close() {  
            running2 = false;  
        }  

        public void run() {  
            BufferedReader reader = new BufferedReader(new InputStreamReader(  
                    System.in));  
            while (running2) {  
                try {  
                    System.out.println("enter some commands:");  
                    String str = reader.readLine();  
                    sc.write(ByteBuffer.wrap(str.getBytes()));  

                } catch (IOException ex) {  
                    Logger.getLogger(ReadKeyBoard.class.getName()).log(  
                            Level.SEVERE, null, ex);  
                }  
            }  

        }  

    }  
} 

原文住所:http://gcguchao8888-sina-com.iteye.com/blog/839021