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服务端：

package test.javanio;   /**   * @author    * @version    * CreateTime：2010-12-1 下午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 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 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 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();// 可有可无           }       }       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);      }  }

客户端：

package test.javanio;   /**   * @author    * @version    * CreateTime：2010-12-1 下午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);                  }              }           }       }  }

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