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【Java】 Java NIO网络编程
作者:舞维天下 / 发布于2013/7/19/ 1007
网络编程

	package thread2;
	import java.io.*;
	import java.nio.*;
	import java.nio.channels.*;
	import java.nio.charset.*;
	import java.net.*;
	import java.util.*;

	public class EchoServer{
	 private Selector selector = null;
	 private ServerSocketChannel serverSocketChannel = null;
	 private int port = 8000;
	 private Charset charset=Charset.forName("GBK");

	 public EchoServer()throws IOException{
	 selector = Selector.open();
	 serverSocketChannel= ServerSocketChannel.open();
	 serverSocketChannel.socket().setReuseAddress(true);
	 serverSocketChannel.socket().bind(new InetSocketAddress(port));
	 System.out.println("服务器启动");
	 }

	 public void accept(){
	 for(;;){
	 try{
	 SocketChannel socketChannel = serverSocketChannel.accept();
	 System.out.println("接收到客户连接，来自:" +
	 socketChannel.socket().getInetAddress() +
	 ":" + socketChannel.socket().getPort());
	 socketChannel.configureBlocking(false);

	 ByteBuffer buffer = ByteBuffer.allocate(1024);
	 synchronized(gate){
	 selector.wakeup();
	 socketChannel.register(selector,
	 SelectionKey.OP_READ |
	 SelectionKey.OP_WRITE, buffer);
	 }
	 }catch(IOException e){e.printStackTrace();}
	 }
	 }
	 private Object gate=new Object();
	 public void service() throws IOException{
	 for(;;){
	 synchronized(gate){}
	 int n = selector.select();

	 if(n==0)continue;
	 Set readyKeys = selector.selectedKeys();
	 Iterator it = readyKeys.iterator();
	 while (it.hasNext()){
	 SelectionKey key=null;
	 try{
	 key = (SelectionKey) it.next();
	 it.remove();
	 if (key.isReadable()) {
	 receive(key);
	 }
	 if (key.isWritable()) {
	 send(key);
	 }
	 }catch(IOException e){
	 e.printStackTrace();
	 try{
	 if(key!=null){
	 key.cancel();
	 key.channel().close();
	 }
	 }catch(Exception ex){e.printStackTrace();}
	 }
	 }//#while
	 }//#while
	 }

	 public void send(SelectionKey key)throws IOException{
	 ByteBuffer buffer=(ByteBuffer)key.attachment();
	 SocketChannel socketChannel=(SocketChannel)key.channel();
	 buffer.flip(); //把极限设为位置
	 String data=decode(buffer);
	 if(data.indexOf("\n")==-1)return;
	 String outputData=data.substring(0,data.indexOf("\n")+1);
	 System.out.print(outputData);
	 ByteBuffer outputBuffer=encode("echo:"+outputData);
	 while(outputBuffer.hasRemaining())
	 socketChannel.write(outputBuffer);

	 ByteBuffer temp=encode(outputData);
	 buffer.position(temp.limit());
	 buffer.compact();

	 if(outputData.equals("bye\r\n")){
	 key.cancel();
	 socketChannel.close();
	 System.out.println("关闭与客户的连接");
	 }
	 }

	 public void receive(SelectionKey key)throws IOException{
	 ByteBuffer buffer=(ByteBuffer)key.attachment();

	 SocketChannel socketChannel=(SocketChannel)key.channel();
	 ByteBuffer readBuff= ByteBuffer.allocate(32);
	 socketChannel.read(readBuff);
	 readBuff.flip();

	 buffer.limit(buffer.capacity());
	 buffer.put(readBuff);
	 }

	 public String decode(ByteBuffer buffer){ //解码
	 CharBuffer charBuffer= charset.decode(buffer);
	 return charBuffer.toString();
	 }
	 public ByteBuffer encode(String str){ //编码
	 return charset.encode(str);
	 }

	 public static void main(String args[])throws Exception{
	 final EchoServer server = new EchoServer();
	 Thread accept=new Thread(){
	 public void run(){
	 server.accept();
	 }
	 };
	 accept.start();
	 server.service();
	 }
	}

	

	/****************************************************
	* 作者：孙卫琴 *
	* 来源：<<Java网络编程精解>> *
	* 技术支持网址：www.javathinker.org *
	***************************************************/
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