本文小编为大家详细介绍“Java NIO怎么实现聊天室程序”,内容详细,步骤清晰,细节处理妥当,希望这篇“Java NIO怎么实现聊天室程序”文章能帮助大家解决疑惑,下面跟着小编的思路慢慢深入,一起来学习新知识吧。
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<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();// 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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